|
Is it possible to create static extension methods in the latest .Net framework? I presently have the following scenario:
I have a bottom level project, call it Base, that defines some objects that
are common accross multiple solution files (lets use UInt128 as an example)
I have a Web Service API project, call it WebAPI, that only contains a web reference
I have a main project file, call it Main, that has a reference to both Base and WebAPIThe problem is that WebAPI contains a class, WebAPI.UInt128, that is logically equivalent to Base.UInt128. Now, I want to add an explicit operator to case a WebAPI.UInt128 into a Base.UInt128 and back. Since neither the WebAPI nor the Base projects have a reference to both types, I wanted to define this operator in the place that makes the most sence, which is within the Main project. Is there some way to do this? Thanks in advance,
Sounds like somebody's got a case of the Mondays
-Jeff
|
|
|
|
|
Yes with framework 3.5 you can create extension methods. Although I would think it better to define it in base and have WebAPI use that reference. Creating a class with the same name in different namespaces, with presumably different functionality will lead to confusing code that is difficult to maintain.
only two letters away from being an asset
|
|
|
|
|
I actually don't create two different classes with the same name... Visual Studio does it for me. Basically, the WebAPI.UInt128 only contains the serialized data from within the Base.UInt128 class, even though both are logically equivalent. However, since the WebAPI is automatically generated and in actuallity does not depend on Base, I should not need to add that reference to the WebAPI project. For a client that DOES have access to both WebAPI and Base, that client should be able to use either UInt128 class interchangeably. That is why I asked for such a thing.
Mark Nischalke wrote: Yes with framework 3.5 you can create extension methods.
Could you please provide an example of how I would declare the following from within the Main project? I am having a hard time finding any documentation describing how to externally define static extension methods.
public static explicit operator WebAPI.UInt128(Base.UInt128 other) { ... }Thanks,
Sounds like somebody's got a case of the Mondays
-Jeff
|
|
|
|
|
Extension methods are created as static methods on static classes with the this keyword in front of the first parameter. For instance, suppose you want to check that a string isn't empty, and that it isn't just made up of spaces then you could use this:
public static class StringExtensions
{
public static bool IsTrimmedNullOrEmpty(this string value)
{
bool returnValue = false;
if (string.IsNullOrEmpty(value) || value.Trim() == string.Empty)
returnValue = true;
return returnValue;
}
}Then you would just call this with
string myString = " ";
if (myString.IsTrimmedNullOrEmpty())
{
Console.WriteLine("This is an empty string");
}
|
|
|
|
|
I have seen examples of such a thing plenty of times online. However, what I am attempting to do is add a type cast operator, which would be a static method in the string class. Your example is actually perfect for what I am trying to do, as myString CANNOT be null given that you added an instance call. Therefore, in the example you gave, is there a way to define a method identical to what you proposed, but that would be called in the following way (so that myString could actually be null without throwing an exception):
if (string.IsTrimmedNullOrEmpty(myString)) { ... }Thanks,
Sounds like somebody's got a case of the Mondays
-Jeff
|
|
|
|
|
You can't make extension operators. Even if you make them manually (with ExtensionAttribute and SpecialNameAttribute) the compiler doesnt pick them up.
|
|
|
|
|
That was my suspicion, but I wanted to be certain prior to proceeding. Thanks for your help,
Sounds like somebody's got a case of the Mondays
-Jeff
|
|
|
|
|
I have seen code like this what does new is doing on the declaration of this function. Is it better to define this way or it's some kind of shortcut. Thanks
public Class A:UserControl
{
public new int Width
{
}
}
|
|
|
|
|
netJP12L wrote: what does new is doing on the declaration of this function.
They hide that information in the documentation[^]
led mike
|
|
|
|
|
I have a custom string being spit out from a log file that I would like make into a DateTime object.
The problem is I have no idea how to do this simply.
Mon Feb 25 07:21:00 2008
The string does not parse straight to a DateTime object and I do not have anyway of changing the format of the incoming string.
|
|
|
|
|
|
Thanks, didn't realize that function was for doing that kind of parsing.
Took me just a few secs to have it up and running properly.
|
|
|
|
|
Sunset Towers wrote: didn't realize that function was for doing that kind of parsing.
Yeah, darn Microsoft keeps hiding the kind of information in the documentation. 
led mike
|
|
|
|
|
Hi ho 
I've noticed something weird. When I try to read an unexisting address location (using ReadProcessMemory of kernel32 libraries), it gives an exception. This is totally normal. Then I'm able to retrieve the error code with GetLastError(). This code can be formatted, which returns a nice string message in my native language.
But now I've noticed something that's not quite normal. When I run the application normally, and the expected exception happens, the FormatMessage returns something like:
"A Read/WriteProcessMemory-operation is only partly executed."
Riiiiiight...  Now the weirdest thing is, if I put a debugging breakpoint just before I retrieve the error code with GetLastError(), and then do a step-by-step running (you know, the F11/F10 thing), it returns something totally different:
"Tried to point to an unexisting token."
Which is the message I want, because that's exactly what I did wrong. But still he doesn't return it if I don't put a breakpoint just before the GetLastError() function. It's as if the system needs a little time to store the error code, and my program is too fast requesting it. I tried a System.Threading.Thread.Sleep(100); or so, but that didn't work.
Here's my code, if that helps:
<br />
if (!ReadProcessMemory(handle, new IntPtr(address), buffer, length, out bytesReadPtr))<br />
{<br />
StringBuilder str = new StringBuilder();<br />
str.Capacity = 1000;<br />
FormatMessage(<br />
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,<br />
IntPtr.Zero,<br />
GetLastError(),<br />
0,<br />
str,<br />
1000,<br />
IntPtr.Zero);<br />
throw new Exception("Unable to read process memory.\n" + str.ToString());<br />
}<br />
Anyone knows what's going on?
Thanks in advance.
(Btw. Can't I use decent tabs in code on this forum?  )
modified on Sunday, March 2, 2008 12:03 PM
|
|
|
|
|
Dear all,
I wrote this piece of code to clear all the textboxes on a control all at once.
foreach (Control control in tabpage.Controls)<br />
{<br />
if (control.GetType() == typeof(TextBox));<br />
{<br />
control.Text = "";<br />
}<br />
}
It works , but .. it also clears all the labels in the control ; however labels are not of type Textbox.
Could somebody tell me what I am doing wrong ?
kind regards,
|
|
|
|
|
Addition to the previous post ... this works :
for (int i = 0; i < this.Controls.Count; i++ )<br />
{<br />
if (this.Controls[i] is TextBox)<br />
{<br />
this.Controls[i].Text = "";<br />
}<br />
}
I'm puzzled now
|
|
|
|
|
Rick van Woudenberg,
foreach (Control control in Controls)
{
if (control is TextBox)
{
TextBox textBox = control as TextBox;
textBox.Text = string.Empty;
}
}
Regards,
Gareth.
|
|
|
|
|
Hi remove the semicolon on the following statement
if (control.GetType() == typeof(TextBox));
then it should work
Regards
Srini
|
|
|
|
|
Hi ho
I've been experimenting with reading memory of other processes for a while now. And I've noticed the virtual addresses are quite weird.
First of all I can't access anything from 0x0 till 0xFFFF. This seems to be a forbidden area or so. :p I've never found a process that didn't have this 'offset'. The first readable address socket is 0x10000. I first thought this previous forbidden area (lower than 0x10000) was a Windows header or so, but it seems this 0x10000 and further is the windows header, including some data like the windir, cpu architecture, and so on.
Now you'd think the actual data of the process itself is just after this Windows header, but that's often not the case. Suddenly there's another piece of memory that's not accessible there. That keeps on going for a while.
Now I searched up some interesting addresses for certain processes (like the Minesweeper of Windows XP), and I can for example find the width and height of a minefield. But when you look at the actual address of this data, it's extremely high (relatively of course): 0x1005334. This is a hundred times higher than the first memory address that's accessible (0x10000).
I've researched a bit, but I can't find information about a certain structure Windows uses for process memory. Maybe there's a fixed virtual address where it actually starts to be interesting to read memory, because that's the actual memory allocated by the process itself?
Thanks in advance.
|
|
|
|
|
Hi,
virtual addresses get assigned by the linker, based on some defaults and a lot of optional
choices you can specify. It gets reported in the optional map file. As a result the address map
can be structured in many ways, all equaly valid.
Not sure how this is a C# question, Minesweeper is a lot older than any .NET stuff.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
|
|
|
|
|
I'm not talking about Minesweeper, I'm talking about any existing process that runs on Windows. :p I'd really like to find some pattern that can be used to find significant memory data more easily.
My final purpose is to make addons for applications that actually don't support addons. 
|
|
|
|
|
Good luck then. I just told you things can be anywhere, it is a matter of choice.
Will your add-ons be programmed in C#? and apply to native code programs???
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
|
|
|
|
|
Thanks, hehehe. I'll just try to make a monitoring program first then, that logs what changes in memory. Then I can see what action changes which addresses.
Yes I will be making addons programmed in C#, applied to native code programs (as far as I know).
|
|
|
|
|
Hi Guys,
I need some help please. I have the following code being called in my timer_elapsed function and my timer is being enabled in the onstart of the windows service. This worked fine with .net 1.1 but ever since I have converted the application to .net 2.0, my service shuts down without notice when there is trafic in client requests i.e. ProcessClientRequest call. When I try to restart the service upon shut down it gives me an error saying "Only one usage of each socket address (protocol/network address/port) is normally permitted"
So I have to stop and wait a few and restart and it works fine and then again when there is much activity in processclientrequest call it shuts down.
I know this is not much information but please help me if you have any ideas.
Writ2ErrLog("Service Timer Initialized");
string sErr = "Application is ready for processing";
try
{
Writ2ErrLog(sErr);
m_tMonitor = new TD.Timer(new TD.TimerCallback(MonitorFunc), 1, 0, 45000);//45 sec
if (m_sServerAddr == string.Empty)
{
m_sServerAddr = Dns.GetHostName();
}
if (m_nPort == -1)
{
m_nPort = 1024;
}
IPHostEntry hostEntry = Dns.GetHostEntry(m_sServerAddr);
IPAddress ipAddress = hostEntry.AddressList[0];
IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, m_nPort);
m_svSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
m_svSocket.Bind(ipEndPoint);
m_svSocket.Listen(10);
while (true)
{
try
{
Socket rtSocket = m_svSocket.Accept();
if (rtSocket.Connected)
{
TD.WaitCallback myCallBack = new TD.WaitCallback(ProcessClientRequest);
TD.ThreadPool.QueueUserWorkItem(myCallBack, rtSocket);
}
}
catch (Exception ex)
{
Writ2ErrLog(ex.Message);
break;
}
}
}
catch (Exception ex)
{
m_svSocket.Close();
m_tMonitor.Dispose();
sErr = "Start Error " + ex.Message;
}
finally
{
if (sErr != string.Empty)
{
Debug.WriteLine(sErr);
Writ2ErrLog(sErr);
}
}
Sameer
|
|
|
|
|
hi all,
i just want to read outlook express 6 contacts using c#. how to do that bcoz using outlook object library you can just browse only the outlook contacts but for outlook express how we can do that?
plz.. any one can help me out. 
Regards,
kiran
kiran
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
