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See my answer to the post below to find out how to do this.
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Hi,
is it possible to remove a property from a inherited control?
for example if i inherit a textbox and i want to remove the "Text" property, is it possible?
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Hi
No you can not remove a Property,
but i think System.ComponentModel.BrowsableAttribute should do the job:
[Browsable(false)]
public override string Text
{
get{}
set{}
}
hope this helps
greets
M@u
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I sometimes make my overrides simply throw a new NotImplementedException, so even though I can't remove them from the options, I can prevent the user from calling them. You can also use the "new" keyword, and return some unexpected type for the property like bool, so noone would call it. The problem, however, is that if they cast your object as a TextBox, then they will still have access to that method. The final option that I have used (my prefered method, although it takes the most time), is to inherit from object (or Control in your case, since you want it to be drawn), but have a private member of type TextBox. Then, export only those properties that you want to be exposed on the underlying type, as follows:
public class m_TextBox : Control {
private TextBox m_Base = new TextBox();
...
public int TextLength {
get { return m_Base.TextLength; }
}
...
}Also note that you will need to override certain methods like OnPaint, OnClick, etc., as well as exporting the events you want on the object. This is a real pain in the a**, but it is the only way I have found in C# to create objects that expose only those properties that you want to expose. Hope this helps,
Sounds like somebody's got a case of the Mondays
-Jeff
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You could always override the PostFilterProperties method and remove the base properties.
protected override void PostFilterProperties(IDictionary props)
{
props.Remove("Text");
}
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Hi All,
Can anyone help me with a method that could generate random dummy files with extensions..(.txt, .log, .exe) in a specified folder?
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what's the folder's name? "My Homework"?
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Folder name could be anything...doesn't matter i can change that :P
I have the following code..
private void button1_Click(object sender, EventArgs e)
{
StreamWriter outStream = null;
string filename = "output.txt";
string message = null;
try
{
outStream = new StreamWriter(filename);
outStream.WriteLine("Hello World");
outStream.Close();
MessageBox.Show(filename);
}
catch (IOException e1)
{
message = "Unable to create " + filename + "\r\n";
message += String.Format("Reason: {0}", e1.Message);
MessageBox.Show(message);
return;
}
message = ("File successfully created");
}
But, this just creates one txt file...Basically, right now I am working with windows application...I have written a program that can delete files from s specified folder older than X number of days, hrs, mins respectively..it works fine..But, i want to test this code thoroughly on a 'dummy' folder before ilet it loose on real data as deleting files in bulk makes me nervous! So, for that i want to create a method that would generete files for me with different extensions...files dont have to be empty... I know i can use for loop to create more files using my own code. But, I am just not sure how I am going to create files with different filter.
Also, The problem with the dummy files is to get a decent spread of 'last modifed' times and i think the only practical way to achieve that is copy existing files from another folder which can be done programatically using File.Copy(). I suppose i could augment these by creating new files programatically with any extension i like and save them to disk using the StreamWriter class.
But, I just want to use a different approach here and see if it actually works
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Ok
you could put the extensions you want to create into an array and then use System.Random class to use a random Extension
private string[] myExtensions[] = new string[]{"exe","txt","log","jpg","bmp"/*,...*/}
to avoid the IOException saying "the file already exists" you could use a timestamp that is added to the Filename
string myFileName = string.Format(@"{0}\someName_{1}.{2}",someFolder,System.DateTime.Now.Ticks,randomExtension);<br />
<br />
and finally, if you want to manipulate the Creation/Modification - Dates of a file, take a look at the <code>System.IO.FileInfo Class
greets
M@u
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Thanks m@u.
I can try what you said, But i think its much easier to get it done.
I think i can do it the following way. Files are getting created in the executable path of windows application project. I want to give out my own path. how do i do that?
private void button1_Click(object sender, EventArgs e)
{
StreamWriter outStream = null;
string message = null;
for (int i = 0; i < (10000); i++)
{
string filename = "output";
filename += i.ToString();
if (i % 3 == 0)
{//multiple of three
filename += ".txt";
}
else if (i % 5 == 0)
{//multiple of 5
filename += ".log";
}
else
{
filename += ".dat";
}
try
{
outStream = new StreamWriter(filename);
outStream.WriteLine("Hello World");
Thread.Sleep(60000);
outStream.Close();
}
catch (IOException e1)
{
message = "Unable to create " + filename + "\r\n";
message += String.Format("Reason: {0}", e1.Message);
MessageBox.Show(message);
}
}
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two comments:
1. that is NOT random at all
2. always show the entire exception, not just it's message part; you may miss essential info.
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Yeah, you might want to use a RNG to generate random numbers, which could be used directly or indirectly as the filename. I recommend a Mersenne Twister, the classes for which are on the web.
I agree with No. 2 as well. Exceptions aren't always what they seem to be, so it's good to have any information you can get.
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Why don't you add a "move to archive" option? That would make your program more useful, and also make you less nervous 
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you are re-inventing the wheel - check this CP article:
http://www.codeproject.com/KB/files/deleteold.aspx[^]
works briliantly
Do you know why it's important to make fast decisions? Because you give yourself more time to correct your mistakes, when you find out that you made the wrong one. Chris Meech on deciding whether to go to his daughters graduation or a Neil Young concert
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Hi,
Very nice Comments on that topic so far. Heres some program that does what you need:
using System;
using System.IO;
class Program
{
static void Main(string[] args)
{
CreateRandomFile(@"C:\");
}
static void CreateRandomFile(string folder)
{
Random rand = new Random();
string[] ext = new string[] { ".dat", ".txt", ".log" };
string filename = Path.Combine(folder,
String.Format("RandFile_{1}.{2}", folder, DateTime.Now.Ticks, ext[rand.Next(0, 3)]));
try
{
File.WriteAllText(filename, "This is a test file");
FileInfo info = new FileInfo(filename);
info.CreationTime = new DateTime(1999, 1, 1, 1, 1, 1);
info.Refresh();
}
catch(IOException) { /* Put Exception-Handling here */ }
}
}
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I would suggest a much simpler approach, using .NET Framework built-in classes...
using System;
using System.IO;
namespace RandomFileNames
{
class Program
{
static void Main(string[] args)
{
//choose any folder you like, I used MyDocuments
string folder = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
CreateRandomFiles(folder, 10);
}
static void CreateRandomFiles(string folderName, int numberOfFiles)
{
string[] extensions = { ".txt", ".exe", ".pdf", ".log", ".xls", ".doc" };
int count = extensions.Length;
string fileName;
Random random = new Random();
for (int i = 0; i < numberOfFiles; i++)
{
//this uses the static method GetRandomFileName()
//of the Path class
try
{
fileName = Path.GetRandomFileName();
//change the extension to one of your choice
fileName = Path.ChangeExtension(fileName, extensions[random.Next(count)]);
//create the final file name
fileName = Path.Combine(folderName, fileName);
//create the file itself
File.Create(fileName);
}
catch (Exception ex)
{
//handle exceptions here
}
}
}
}
}
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I have user control.
I wish to add some reference to user's project when the user put my control on his form.
I use VS 2005 C#.
Thank you.
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Razizao wrote: I wish to add some reference to user's project when the user put my control on his form.
If you have compiled up your component into a DLL, then the reference is added for you automatically.
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its not what i ment.
I want to add another references, besides the control dll.
for example,
when the developer adding my control to his form,
i want to add 3 more references to my other dlls.
do u know how to do that ?
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What is/are the cell events that are fired After _cellformatting?
Thanks
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i have a tiff image with multipule pages in it.its size is 2650 x 3300 and i want to reduse it to 1728 x 2200. is there any way that i can reduse its size. please help me.
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One way to do this could be:
public Bitmap ResizeBitmap(Bitmap b, int width, int height )
{
Bitmap result = new Bitmap( width, height );
using( Graphics g = Graphics.FromImage((Image) result ))
{
g.DrawImage( b, 0, 0, width, height );
}
return result;
}
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This code is working but there is no change in the file size. so how it will effect the file size and where it will be save the file with new size?
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