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As Eddy has said, you need to use a newer version of VS (i.e. 2008 or 2010) in order for the compiler to accept the lambda expressions. It is not just the installed version that is required
Don't vote my posts down just because you don't understand them - if you lack the superior intelligence that I possess then simply walk away
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>What are you trying to achieve?
Actually i have got couple of files named like file1.txt, file2.txt etc... and these files are having unicode data too. I have to store these files data into databases like Oracle, SQL Server. So, i was in search to first convert a unicode string to convert it into editable text; i.e. something like :
Unicode String is "This is a unicode string" and i wish :
New String is : "Something text after conversion"; and then if i select hindi (an Indian Language) font for new string; it will show me the original string as it was in Unicode.
Now, here i do'nt know how do i know the complete steps to convert these files into that format; so that i can store those data into databases.
Thank you.
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Girish481 wrote: I have to store these files data into databases like Oracle, SQL Server. So, i was in search to first convert a unicode string to convert it into editable text; i.e. something like :
Every string in .NET is in Unicode, it's the default nowadays. Meaning that you only need to read the text and pass it on to your database. Do make sure that your database also stores them in that format.
Girish481 wrote: Unicode String is "This is a unicode string" and i wish :
New String is : "Something text after conversion";
That doesn't make sense. Unicode contains Hindi-characters - what would you want to convert them into?
Girish481 wrote: and then if i select hindi (an Indian Language) font for new string; it will show me the original string as it was in Unicode.
Both show the original string in the same encoding, only with different fonts. Some fonts are designed for use with ANSI and a specfic codepage, others were created for unicode[^]. Your string in Hindi should look allright when displayed as unicode in one of those fonts.
I are Troll 
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I am sorry for being late reply.
Probably i am not able to explain my need. See, whatever you have said, that is fine that if i says dim x as string="Hindi Words"; they are visible in the dotnet; but i want to convert them into "editable text", wish to apply some sort of font displays like bold, italic, color change etc. so, that i can say select * from mytable where name like '%Some Search String based upon Hindi words..%'. Here issue is that they are visible in IDE and Textboxes; but how do i give select criteria in the textbox so that database can see the query as mentioned above please.
Please let me know :
1.How do i convert Unicode Text to Edibable Text?
2.It would be more helpful if you please show me some code in action.
@ the moment; i am reading below link... but Ouch...it is also returning error....
Please scorll down and read the reply posted by Atul Bari...
http://nishantpant.wordpress.com/2007/01/04/how-to-convertdisplay-a-unicode-string-in-vbnet/
and the SQL Server Error is :
Msg 102, Level 15, State 1, Procedure Hex, Line 11
Incorrect syntax near '‘'.
Msg 102, Level 15, State 1, Procedure Hex, Line 20
Incorrect syntax near '‘'.
Msg 102, Level 15, State 1, Procedure Hex, Line 29
Incorrect syntax near '‘'.
Msg 102, Level 15, State 1, Procedure Hex, Line 38
Incorrect syntax near '‘'.
Msg 102, Level 15, State 1, Procedure Hex, Line 52
Incorrect syntax near 'end'.
Thank you very much for your continue support.
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Girish481 wrote: Probably i am not able to explain my need
No worries; text-encoding is a though subject and I'm not very good at explaining either.
Girish481 wrote: . See, whatever you have said, that is fine that if i says dim x as string="Hindi Words"; they are visible in the dotnet;
Strings in .NET are in Unicode, in UTF8 to be precise. (UTF7, 8, 16 and 32 are all Unicode-formats), but Windows was around long before .NET - not everything is prepared for multibyte-characters. As a test, you can create a new project in Visual Studio and replace the code from Form1 with this code;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
public partial class Form1 : Form
{
const String ओम् = "ॐ (that's Ohm)";
TextBox myTextBox;
RichTextBox myRichBox;
public Form1()
{
InitializeComponent();
myTextBox = new TextBox();
myTextBox.Dock = DockStyle.Top;
myTextBox.Text = ओम्;
this.Controls.Add(myTextBox);
myRichBox = new RichTextBox();
myRichBox.Dock = DockStyle.Top;
myRichBox.Text = ओम्;
this.Controls.Add(myRichBox);
String cs = "Server=.;Database=Northwind;Trusted_Connection=True;";
using (SqlConnection con = new SqlConnection(cs))
using (SqlCommand cmd = con.CreateCommand())
{
cmd.CommandText = "UPDATE Customers SET CompanyName = @what WHERE ContactName = @ContactName";
cmd.Parameters.AddWithValue("ContactName", "Antonio Moreno");
cmd.Parameters.AddWithValue("what", ओम्);
con.Open();
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
cmd.CommandText = "SELECT CompanyName + '.' + ContactName FROM Customers WHERE CompanyName LIKE @bla";
cmd.Parameters.AddWithValue("bla", "%ॐ%");
string result = cmd.ExecuteScalar().ToString();
myTextBox.Text = result;
myRichBox.Text = result;
}
}
}Visual Studio should complain that you're using non-standard characters and it should propose to save it in a "universal" format - that's going to be Unicode again. If you have the Nortwind-database installed than you can execute this code as is, otherwise you'll have to change the table-names.
If all is well, it'd update a record in that database and search that record again - displaying the result in both textboxes.
Girish481 wrote: 1.How do i convert Unicode Text to Edibable Text?
As the example shows, Unicode is editable. Not every control understands unicode, which might be the reason why your seeing blocks (or question marks) in certain controls. It should also be noted that most databases expect ASCII/ANSI for text-fields, having special fields for multibyte-character sets. In Sql Server, that'd be the datatypes that are prefixed with an 'N', like NVARCHAR.
Girish481 wrote: and the SQL Server Error is :
Are you concatenating the parameter to the command (like "SELECT " + textbox1.Text) or are you using a SqlParameter to fill in the parameters of the query?
Hope this gets you going in the right direction 
I are Troll
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First i really wish to heartly thank to you for your continue support.
Thats a really very good, clear and helpful reply for me; but still issues are there:
1.How do i give/type Unicode in the textbox, something like :
Select * from mytable where name like '%ओम%' (Here i am copying from your reply)
I think if any how i am able to convert this ओम into "vkse" then it is how i wish to store the data in the table. Here "vkse" is the hindi translation of ओम if i select any Hindi font please;
or if you still feel that i am not explaning my need properly; please contact at my mail id i.e. gksharmaajmer@gmail.com
Thank you.
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Girish481 wrote: First i really wish to heartly thank to you for your continue support.
You're welcome
Girish481 wrote: 1.How do i give/type Unicode in the textbox, something like :
Select * from mytable where name like '%ओम%' (Here i am copying from your reply)
There's a catch there, in the Sql part. If you execute that statement in Sql Server Management Studio Express (or any other Query-tool) than you'll find 0 records. The statement below should work, but..
SELECT * FROM mytable WHERE name LIKE N'%ओम%' There's another caveat, with the .AddWithValue method on the SqlCommand class; somehow it finds 0 records again. Long story short, a bit (working) code with a workaround;
public partial class Form1 : Form
{
const String Ohm = "ओम्";
RichTextBox myRichBox;
public Form1()
{
InitializeComponent();
myRichBox = new RichTextBox();
myRichBox.Dock = DockStyle.Top;
myRichBox.Text = "ओ";
this.Controls.Add(myRichBox);
using (SqlConnection con = new SqlConnection(
"Server=.;Database=AdventureWorks;Trusted_Connection=True;"))
using (SqlCommand cmd = con.CreateCommand())
{
cmd.CommandText =
"UPDATE Person.Contact SET FirstName = @what WHERE ContactID = @ContactID";
cmd.Parameters.AddWithValue("ContactID", 25);
cmd.Parameters.AddWithValue("what", "O" + Ohm);
con.Open();
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
cmd.CommandText =
"SELECT ContactID FROM Person.Contact WHERE FirstName LIKE N'%@what%'";
cmd.CommandText = cmd.CommandText.Replace("@what", myRichBox.Text);
string result = cmd.ExecuteScalar().ToString();
myRichBox.Text = "Found record @Id; " + result;
}
}
}I've used the AdventureWorks database here, but it should work equally with the Northwind database. This[^] page on MSDN has some lengthy explanation.
I are Troll
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Even though i have not yet tried your code in my machine (VS 2010) because you are showing the code in a different approach, but my need/question is different. I agree that if i runs your code it will work fine if table is having Unicode Strings in the columns; but my question is "How i will give Unicode Strings in the Textbox to search the table" like :
select * from mytable where col1=Textbox1.Text (Here how do i supply Unicode in the Textbox).
Whereas, if i were able to store converted strings in the column then i think it is more flexible to handle the data, because now it is converted and editable to any tool. Something like if table is having Unicode values then problem is how do i supply / search in the table using textbox1 and then populate my FlexGrid.
I think its going a larger thread on the forum, thats why i gave you my mail id; so that if i gets the final and the complete answer; then i will post your code here; so that other user of the forum may get handy answer as well.
Best Regards.
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Girish481 wrote: Something like if table is having Unicode values then problem is how do i supply / search in the table using textbox1 and then populate my FlexGrid.
Searching is done using the LIKE operator as shown. Giving the user an easy way to enter values would be harder; some languages would require their own IME-editor[^].
If the keyboard can't supply all characters, then you'll need one of those.
I are Troll
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Hi
One question - is it impossible to safe guard an application hosting third party dll?
See this thread, even if third party dll loaded into separate AppDomain, it can still access AppDomain.Current.Get/SetData[^]
In addition to AppDomain.Current.Get/SetData, can third party examine application memory. For example, hosting application may contain a secret/private key in some application context, which is used to decrypt communications or licensing file. Even if private key is not placed in AppDomain.Current.Get/SetData, is it possible for third party dll to ... perhaps "reflect" on the process memory foot print and extract the private key?
If the answer is yes - then it follows really the moment you load a third party dll into your own process, you cannot be sure if your process has been compromised?
I think security is even more important than say process isolation safe guarding against crashes in third party dll.
Thanks
NOTE: This is NOT a question on CAS[^] as setting permissions/evidence doesn't has anything to do with access to AppDomain from third party dll[^]
Also, this is not a question on serializing access to a singleton instance object[^]
dev
modified on Thursday, March 3, 2011 5:41 AM
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devvvy wrote: In addition to AppDomain.Current.Get/SetData, can third party examine application memory.
Yes. Wouldn't be worth the effort though. I'm running Linux, Windows-applications are executed under Wine, .NET applications are run under Mono - and I can access the source-code of the VM if need be.
devvvy wrote: If the answer is yes - then it follows really the moment you load a third party dll into your own process, you cannot be sure if your process has been compromised?
You cannot even be sure if you don't load any external code; only if you have complete control over the environment.
I are Troll
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> I know reflection can enumerate types of assemblies. I also know if you pass in any object (For example, a LicenseController sitting in AppDomain.Current.Get/Set), reflection can basically enumerage types/properties (set/get any "private" members and methods!). So basically anything sitting in AppDomain.Current.Get/Set is UNSECURED.
One further question out of curiosity - can third party dll can a raw byte[] image of process memory...?
"and I can access the source-code of the VM if need be."
> Access source code? Even if I use an obfuscator..!?
So all this jazz about AppDomain are *practically useless* from security stand point. I've also tried to throw an exception from code from another appDomain, it crashes the whole app (see below).
Sounds like all theories surrounding appDomain completely b*llsh*t!
<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
using System.Threading;<br />
using System.Reflection;<br />
using System.Security.Policy;<br />
<br />
using UserUtil;<br />
using SimpleUtil;<br />
<br />
namespace SimpleTest<br />
{<br />
class Program<br />
{<br />
public const string KEY1 = "KEY1";<br />
public static AppDomain UserDomain = null;<br />
public static SimpleUtil.IServiceProvider UserProvider = null;<br />
<br />
static void Main(string[] args)<br />
{<br />
Assembly UserAssembly = null;<br />
Object oProvider = null;<br />
Thread t = null;<br />
<br />
try<br />
{<br />
AppDomain.CurrentDomain.SetData(KEY1, "PrivateKey");<br />
<br />
UserDomain = AppDomain.CreateDomain("UserDomain");<br />
UserDomain.SetData(KEY1, "Sh*t!");<br />
<br />
UserAssembly = Assembly.LoadFrom("UserUtil.dll");<br />
<br />
oProvider = UserDomain.CreateInstanceFrom("UserUtil.dll", "UserUtil.ServiceProvider").Unwrap();<br />
<br />
if (oProvider != null)<br />
{<br />
if (oProvider is SimpleUtil.IServiceProvider)<br />
{<br />
UserProvider = (SimpleUtil.IServiceProvider)oProvider;<br />
<br />
t = new Thread(new ParameterizedThreadStart(Program.AsyncDoWork));<br />
t.Start("Calling UserProvider.DoWork");<br />
}<br />
}<br />
<br />
while (true)<br />
{<br />
Console.Write(".");<br />
Thread.Sleep(1000 * 5);<br />
}<br />
}<br />
catch (Exception Ex)<br />
{<br />
Console.WriteLine(Ex.Message);<br />
}<br />
<br />
return;<br />
}<br />
<br />
public static void AsyncDoWork(object Arg)<br />
{<br />
string Message = null;<br />
Message = (string)Arg;<br />
UserProvider.DoWork(Message); << If inside third party "DoWork" throws an exception, it'd crash the hosting app even it's instantiated from different AppDomain! Also it can access AppDomain.Current.GetData("SomeSecret"). On these two reasons - all this talk about AppDomain isolation are quite pointless.<br />
return;<br />
}<br />
}<br />
}<br />
dev
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devvvy wrote: can third party dll can a raw byte[] image of process memory
Yes/No. Most games that were created before the .NET era were cracked, despite some huge investments in copy-protection. It's not doable to reverse-engineer the entire code, but that's rarely done at all - bypassing the protection or getting the password to the database is often enough.
devvvy wrote: So all this jazz about AppDomain are *practically useless* from security stand point. I've also tried to throw an exception from code from another appDomain, it crashes the whole app (see below).
Sounds like all theories surrounding appDomain completely b*llsh*t!
Again, yes and no. An AppDomain isn't a new security-feature, it's an isolationlevel for applications. One that can be unloaded, if desired. It also means that I can execute (potentially malicious) code in a sandboxed environment[^], increasing my overall security. The code in that sandbox is restricted in what it can and cannot do.
I'm running Linux, and I have the source-code to the Operating System, as well as the Mono source-code. It'd be some work, but it could be used to backtrack what API's you're calling - even the paramaters that you pass aren't safe from prying eyes.
devvvy wrote: all this talk about AppDomain isolation are quite pointless
Depends on what you wants it for, and how secure you need to be. Do you need to prevent an ordinary user from making modifications? Prevent someone from seeing the users' data? Or are you creating an application for a nuclear plant?
In the first case, encryption would suffice. In the second case, obfuscation would suffice. In the last case, you simply need total control over the machine - then you'd only be vulnerable for stuxnet
I are Troll
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Hello I tried out your advice - MSDN article on sand boxing third party dll [^]
The following code created new AppDomain for third party dll, invoke it and found out that AppDomain.Current.GetData[KEY1] refers to that of the "New Domain" (not old AppDomain of hosting app)
But again, two problems still remains:
a. third party can still access all AppDomain - see this.[^]
(But if MSDN is correct, GetCallingAssembly requires ReflectionPermission as well - so DENY ReflectionPermission is very key)[^]
b. third party library can simply retrieves hosting types by GetCallingAssembly
<br />
public void DoWork(string Message)<br />
{<br />
<br />
Type[] Types = Assembly.GetCallingAssembly().GetTypes();<br />
if (Types != null)<br />
{<br />
foreach (Type t in Types)<br />
{<br />
Console.WriteLine("Detected type: " + t.FullName);<br />
}<br />
}<br />
c. Am I doing it right below on how to DENY ReflectionPermission? (By setting PermissionState.None)
Anyway here's my full test code.
<br />
***** Program.cs *****<br />
using System;<br />
using System.IO;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
using System.Threading;<br />
<br />
using System.Reflection;<br />
using System.Security;<br />
using System.Security.Policy;<br />
using System.Security.Permissions;<br />
<br />
using UserUtil;<br />
using SimpleUtil;<br />
<br />
namespace TestAppDomain<br />
{<br />
class Program <br />
{<br />
public const string KEY1 = "KEY1";<br />
public static AppDomain UserDomain = null;<br />
<br />
static void Main(string[] args)<br />
{<br />
string UntrustedThirdPartyDir = @"..\..\UserUtil\UserUtil\bin\Debug";<br />
string ThirdPartyDll = "UserUtil.dll";<br />
string ThirdPartyServiceFullyQualifiedName = "UserUtil.ServiceProvider";<br />
<br />
Assembly UserAssembly = null;<br />
<br />
Object oProvider = null;<br />
SimpleUtil.IServiceProvider UserProvider = null;<br />
<br />
try<br />
{<br />
#region Sandbox preparation<br />
AppDomainSetup AdSetup = new AppDomainSetup();<br />
AdSetup.ApplicationBase = Path.GetFullPath(UntrustedThirdPartyDir);<br />
<br />
PermissionSet PermSet = new PermissionSet(PermissionState.None);<br />
PermSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.Execution));<br />
<br />
<br />
ReflectionPermission RefPerm = new ReflectionPermission(PermissionState.None);<br />
PermSet.AddPermission(RefPerm);<br />
<br />
StrongName FullTrustAssembly = typeof(Program).Assembly.Evidence.GetHostEvidence<StrongName>();<br />
#endregion<br />
<br />
<br />
UserDomain = AppDomain.CreateDomain(<br />
"UserDomain", null, AdSetup, PermSet, FullTrustAssembly<br />
);<br />
<br />
AppDomain.CurrentDomain.SetData(KEY1, "PrivateKey");<br />
UserDomain.SetData(KEY1, "NoProblem!");<br />
<br />
oProvider = Activator.CreateInstanceFrom(<br />
UserDomain, ThirdPartyDll, ThirdPartyServiceFullyQualifiedName<br />
).Unwrap();<br />
<br />
#region No need for this...<br />
#endregion<br />
<br />
#region No need for this either ..<br />
#endregion<br />
<br />
if (oProvider != null)<br />
{<br />
if (oProvider is SimpleUtil.IServiceProvider)<br />
{<br />
UserProvider = (SimpleUtil.IServiceProvider)oProvider;<br />
<br />
Object[] parameters = { "Calling UserProvider.DoWork" };<br />
<br />
while (true)<br />
{<br />
#region OPTION 1: prints out "UserUtil.DoWork - secret=NoProblem!"<br />
#endregion<br />
<br />
#region OPTION 2: prints out "UserUtil.DoWork - secret=NoProblem!"<br />
UserProvider.GetType().GetMethod("DoWork").Invoke(UserProvider, parameters);<br />
#endregion<br />
}<br />
}<br />
}<br />
}<br />
catch (Exception Ex)<br />
{<br />
Console.WriteLine(Ex.Message);<br />
}<br />
<br />
return;<br />
}<br />
}<br />
}<br />
<br />
*** SimpleUtil.ServiceProvider ***<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
using System.Runtime.Serialization;<br />
<br />
namespace SimpleUtil<br />
{<br />
[Serializable()]<br />
class ServiceProvider : SimpleUtil.IServiceProvider<br />
{<br />
public void DoWork(string Message)<br />
{<br />
Console.WriteLine("SimpleUtil.DoWork");<br />
return;<br />
}<br />
<br />
public ServiceProvider()<br />
{<br />
return;<br />
}<br />
<br />
public ServiceProvider(SerializationInfo info, StreamingContext context)<br />
{<br />
return;<br />
}<br />
<br />
public void GetObjectData(<br />
SerializationInfo info,<br />
StreamingContext context<br />
)<br />
{<br />
return;<br />
}<br />
<br />
}<br />
}<br />
<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
using System.Runtime.Serialization;<br />
<br />
namespace SimpleUtil<br />
{<br />
public interface IServiceProvider : ISerializable<br />
{<br />
void DoWork(string Message);<br />
}<br />
}<br />
<br />
<br />
***** UserUtil.ServiceProvider *****<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
<br />
#region "Inheritance security rules violated while overriding member" runtime error<br />
<br />
#endregion<br />
<br />
using System.Security;<br />
using System.Security.Policy;<br />
using System.Security.Permissions;<br />
<br />
using System.Runtime.Serialization;<br />
<br />
using SimpleUtil;<br />
<br />
namespace UserUtil<br />
{<br />
[Serializable()]<br />
public class ServiceProvider : MarshalByRefObject, SimpleUtil.IServiceProvider<br />
<br />
{<br />
public void DoWork(string Message)<br />
{<br />
<br />
object oSecret = null;<br />
string secret = null;<br />
<br />
oSecret = AppDomain.CurrentDomain.GetData("KEY1");<br />
if (oSecret != null)<br />
{<br />
secret = (string)oSecret;<br />
Console.WriteLine("UserUtil.DoWork - secret=" + secret);
}<br />
else<br />
{<br />
Console.WriteLine("UserUtil.DoWork - secret=NULL!");<br />
}<br />
return;<br />
}<br />
<br />
public ServiceProvider()<br />
{<br />
return;<br />
}<br />
<br />
public ServiceProvider(SerializationInfo info, StreamingContext context)<br />
{<br />
return;<br />
}<br />
<br />
[SecurityCriticalAttribute()]<br />
public void GetObjectData(<br />
SerializationInfo info,<br />
StreamingContext context<br />
)<br />
{<br />
return;<br />
}<br />
}<br />
}<br />
dev
modified on Saturday, March 5, 2011 6:47 AM
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devvvy wrote: a. third party can still access all AppDomain - see this.[^][^]
It's not designed to be a security-feature where you prevent others from looking at your public properties;
Controls access to non-public types and members through the System.Reflection APIs The weakest link would be the .NET-environment itself. Again, what are you securing here? If it's your business-logic, then you might want to consider webservices - that way the other person doesn't have physical access to your code.
I are Troll
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I believe the sandbox is meant to prevent other people's code from doing stupid things, not to keep the user out. It might be more efficient to buy an existing system to protect your software.
I are Troll
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Thanks
I think I will not host third party dll in my apps - instead our app will kick start a separate win32 console exe acting as sandbox, send the request to this sandbox which will then load the third party dll. The core app will not send anything sensitive to the sandbox, permission of which will be governed by service account under which it impersonates (i.e. runas)
Screw CAS if even Microsoft is discarding it.
dev
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Hi
I have an application that allows users to upload documents. When the user clicks upload, I want to be able to pop up a different form with a progressbar and a label. The idea is for the progress bar to indicate the total progress of the documents being uploaded, and for the label to display the kilobytes that have been uploaded so far. How can I pass the increment percentage through to this form and update the progressbar on a different thread, without the interface stalling and only updating once the operation has finished. I`m using a delegate to pass info though, and I have tried using the backgroundworker, but I don't think that would work for me. Below is a sample of what I am trying to achieve:
foreach (Document doc in Documents)
{
}
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Assuming your upload work is done on a BackgroundWorker, then use the ProgressChanged event of the background worker, this should update the values in the other form via a function such as...
FORM 1
Form2 form2 = new Form2();
BackgroundWorker bw = new BackgroundWorker();
void OnFormLoad()
{
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
}
void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
form2.UpdateProgress(e.ProgressPercentage, e.UserState);
}
void StartUpload()
{
bw.RunWorkerAsync();
form2.Show();
}
FORM 2
public void UpdateProgress(int percentageComplete, object otherData)
{
progressBar1.Value = percentageComplete;
Label1.Text = (string)otherData;
}
..hope this helps
Don't vote my posts down just because you don't understand them - if you lack the superior intelligence that I possess then simply walk away
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I've realised that this method won't work due to various other methods that gets called from the long operation, methods that change controls etc. This raises the "control accessed from a different thread..." error. I cannot change these methods becauses it is part of a rather tightly coupled project. There must be a way to simply update the progressbar on the LoadingForm using a thread?!
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I have my own custom class that I use for this which I am intending to post in an article real soon but here is the code if it helps - it is using a custom progress bar that has a Marquee property rather than Style, but the calls to this can easily be altered to use the standard one. The worker part of this code is essentially the same as the .NET BackgroundWorker and I have extended the ProgressChangedEventArgs so I can pass two lots of text in addition to the usual.
using System;
using System.ComponentModel;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
namespace DaveyM69.Windows.Forms
{
[ToolboxBitmap(typeof(Form))]
public class ProgressForm : Form
{
public const string NoMessageChange = null;
public const int NoProgressChange = -1;
public event DoWorkEventHandler DoWork;
public event ProgressChangedEventHandler ProgressChanged;
public event RunWorkerCompletedEventHandler RunWorkerCompleted;
private object argument;
private AsyncOperation asyncOperation;
private Button button;
private bool cancellationPending;
private readonly SendOrPostCallback completed;
private bool isBusy;
private Label label;
private readonly SendOrPostCallback progress;
private ProgressBar progressBar;
private readonly ParameterizedThreadStart work;
private bool workerReportsProgress;
private bool workerSupportsCancellation;
public ProgressForm()
{
InitializeComponent();
argument = null;
asyncOperation = null;
completed = new SendOrPostCallback(Completed);
isBusy = false;
progress = new SendOrPostCallback(Progress);
work = new ParameterizedThreadStart(Work);
workerReportsProgress = true;
workerSupportsCancellation = true;
}
[Browsable(false)]
public object Argument
{
get { return argument; }
set
{
if (argument != value)
{
if (!isBusy)
argument = value;
}
}
}
[Browsable(false)]
public bool CancellationPending
{
get { return cancellationPending; }
}
[Browsable(false)]
public bool IsBusy
{
get { return isBusy; }
}
[DefaultValue(true)]
public bool WorkerReportsProgress
{
get { return workerReportsProgress; }
set
{
if (workerReportsProgress != value)
{
workerReportsProgress = value;
SetWorkerReportsProgress();
}
}
}
[DefaultValue(true)]
public bool WorkerSupportsCancellation
{
get { return workerSupportsCancellation; }
set
{
if (workerSupportsCancellation != value)
{
workerSupportsCancellation = value;
SetWorkerSupportsCancellation();
}
}
}
public void CancelAsync()
{
if (isBusy)
{
button.Enabled = false;
cancellationPending = true;
}
}
private void Completed(object state)
{
asyncOperation = null;
cancellationPending = false;
isBusy = false;
button.Enabled = false;
RunWorkerCompletedEventArgs e = (RunWorkerCompletedEventArgs)state;
OnRunWorkerCompleted(e);
if (Modal)
DialogResult = e.Cancelled ?
DialogResult.Cancel : e.Error == null ?
DialogResult.OK : DialogResult.Abort;
else
Close();
}
private void InitializeComponent()
{
this.label = new System.Windows.Forms.Label();
this.progressBar = new DaveyM69.Windows.Forms.ProgressBar();
this.button = new System.Windows.Forms.Button();
this.SuspendLayout();
this.label.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.label.AutoEllipsis = true;
this.label.Location = new System.Drawing.Point(12, 9);
this.label.Name = "label";
this.label.Size = new System.Drawing.Size(200, 13);
this.label.TabIndex = 0;
this.label.Text = "Working...";
this.progressBar.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.progressBar.Location = new System.Drawing.Point(12, 25);
this.progressBar.Marquee = false;
this.progressBar.Name = "progressBar";
this.progressBar.Size = new System.Drawing.Size(200, 23);
this.progressBar.TabIndex = 1;
this.progressBar.Text = "0%";
this.progressBar.Value = 0;
this.button.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.button.Location = new System.Drawing.Point(137, 54);
this.button.Name = "button";
this.button.Size = new System.Drawing.Size(75, 23);
this.button.TabIndex = 2;
this.button.Text = "&Cancel";
this.button.UseVisualStyleBackColor = true;
this.AcceptButton = this.button;
this.ClientSize = new System.Drawing.Size(224, 89);
this.ControlBox = false;
this.Controls.Add(this.button);
this.Controls.Add(this.progressBar);
this.Controls.Add(this.label);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "ProgressForm";
this.ShowInTaskbar = false;
this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
this.Text = "Progress";
this.ResumeLayout(false);
}
protected virtual void OnDoWork(DoWorkEventArgs e)
{
DoWorkEventHandler eh = DoWork;
if (eh != null)
eh(this, e);
}
protected virtual void OnProgressChanged(ProgressChangedEventArgs e)
{
ProgressChangedEventHandler eh = ProgressChanged;
if (eh != null)
eh(this, e);
}
protected virtual void OnRunWorkerCompleted(RunWorkerCompletedEventArgs e)
{
RunWorkerCompletedEventHandler eh = RunWorkerCompleted;
if (eh != null)
eh(this, e);
}
protected override void OnShown(EventArgs e)
{
base.OnShown(e);
RunWorkerAsync();
}
private void Progress(object state)
{
DaveyM69.ComponentModel.ProgressChangedEventArgs e =
(DaveyM69.ComponentModel.ProgressChangedEventArgs)state;
if (e.TaskName != NoMessageChange)
Text = e.TaskName;
if (e.OperationName != NoMessageChange)
label.Text = e.OperationName;
if (workerReportsProgress && e.ProgressPercentage != NoProgressChange)
{
progressBar.Value = e.ProgressPercentage;
OnProgressChanged(e);
}
}
public void ReportProgress(int progressPercentage)
{
ReportProgress(
NoMessageChange, NoMessageChange, progressPercentage, null);
}
public void ReportProgress(string taskName, string operationName)
{
ReportProgress(taskName, operationName, NoProgressChange, null);
}
public void ReportProgress(string taskName, string operationName,
int progressPercentage, object userState)
{
DaveyM69.ComponentModel.ProgressChangedEventArgs state =
new ComponentModel.ProgressChangedEventArgs(
taskName, operationName, progressPercentage, userState);
if (asyncOperation == null)
progress(state);
else
asyncOperation.Post(progress, state);
}
private void RunWorkerAsync()
{
if (!isBusy)
{
isBusy = true;
button.Enabled = workerSupportsCancellation;
asyncOperation = AsyncOperationManager.CreateOperation(null);
work.BeginInvoke(argument, null, null);
}
}
private void SetWorkerReportsProgress()
{
if (InvokeRequired)
new MethodInvoker(SetWorkerReportsProgress).Invoke();
else
{
progressBar.Marquee = !workerReportsProgress;
}
}
private void SetWorkerSupportsCancellation()
{
if (InvokeRequired)
new MethodInvoker(SetWorkerSupportsCancellation).Invoke();
else
{
if (isBusy && !cancellationPending)
button.Enabled = workerSupportsCancellation;
else
button.Enabled = false;
}
}
private void Work(object obj)
{
bool cancelled = false;
Exception error = null;
object result = null;
DoWorkEventArgs doWorkEventArgs = new DoWorkEventArgs(obj);
try
{
OnDoWork(doWorkEventArgs);
if (doWorkEventArgs.Cancel)
cancelled = true;
else
result = doWorkEventArgs.Result;
}
catch (Exception ex)
{
error = ex;
}
RunWorkerCompletedEventArgs state = new RunWorkerCompletedEventArgs(
result, error, cancelled);
asyncOperation.PostOperationCompleted(completed, state);
}
}
}
namespace DaveyM69.ComponentModel
{
public class ProgressChangedEventArgs : System.ComponentModel.ProgressChangedEventArgs
{
private string operationName;
private string taskName;
public ProgressChangedEventArgs(
string taskName, string operationName,
int progressPercentage, object userState)
: base(progressPercentage, userState)
{
this.taskName = taskName;
this.operationName = operationName;
}
public string OperationName
{
get { return operationName; }
}
public string TaskName
{
get { return taskName; }
}
}
}
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if only someone would write an article on this interesting subject...
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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I'm going to be concentrating on WP7 dev for the forseeable future so WPF will also be a logical move for desktop I suppose. I have built up quite a library of useful components/controls etc for WinForms over the years that I'm combining into one demo project to share.
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I agree
Thanks for the post from musefan, it did help me quite a lot. My code seemed to work fine, then I renamed a couple of things and then it didn't update the progressbar correctly anymore, then I undid the changes and it still doesn't work  I know it did work though so I must just be missing something
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