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That is OK. But AFAIK, you won't get design time support for control arrays in C#. You need to edit the designer generated code to make the radio buttons in an array or write your own code to add it to the form.
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The story behind this question is simple: I'm trying to build a serializer that serializes a generic class into a custom format.
public class NGConfigUnit<t>
{
protected T _value;
.........
.......
public T Value
{
get
{
return _value;
}
set
{
_value = value;
_isDirty = true;
}
}
}
Problem is that when I access the class via reflection the values are returned as object.
Even though I can check the value of T using reflection and generate an instance using a factory, I cannot reference a generic instance dynamically i.e. I cannot write something like (no support for this C#):
NGConfigUnit<typeof(myval> unit = .....
This blocks me from accessing fields and properties explicitly, which is crucial for the rest of my code.
Any idea how to reach am alternative?
Thanks,
Omer
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You are probably getting a version mismatch.
Try running the scenario WITHOUT rebuilding you project.
xacc.ide - now with TabsToSpaces support IronScheme - 1.0 beta 1 - out now! ((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))
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I'm afraid my question was not understood.
The generic parameter type to be returned by reflection is known only at runtime, so I cannot write in my code something like:
NGConfigUnit<double> unit = fieldInfo.GetValue(obj, null) ..... - I simply don't know if the value returned shall be NGConfigUnit<double> or NGConfigUnit<int> or whatever ...
So what I need is a way to invoke NGConfigUnit<t> methods not using reflection and w/o knowing what T is in advance. I doubt if there's such a way, but suggestions are welcomed.
Thanks,
Omer
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Hi all,
I look 5 event log type in window event log. They are as under.
<br />
error.<br />
information.<br />
warning.<br />
success audit.<br />
failure audit.<br />
While, my requirement is to add 2 more custom event log type, along with it...such as
<br />
FATAL.<br />
DEBUG. <br />
Can any one advice me, how to do it...(PROGRAMATICALLY)
thax in advance.
Thanks,
Chintan(India)
modified on Wednesday, December 10, 2008 3:53 AM
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windows application using c#...
i have 500 records in my table....
i have to the records in multiples of 50...
how can i do this...
send me sugesstion or samp coding...
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With paging, I guess. You can page by requesting 50 records at a time from the DB, or by asking the control to page the full dataset for you.
Christian Graus
Driven to the arms of OSX by Vista.
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Use datagrid with paging and set the max records for a page 50.get the records from DB put it in dataset or Datatable bind it to grid with paging
Cheers!!
Brij
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// Exception Handling
using System;
using Students;
public class ExceptionHandling {
static void Main(){
// We declare two students object references, but only instantiate one
// Student object; s2 is given a value of null, indicating that it
// isn't presently holding onto any object.
student s1 = new student();
student s2 = null;
// Exception handling is now in place.
try {
Console.WriteLine("Initializing students....");
// this line executes without throwing exception.
s1.Name = "Fred";
// This next line of code throws a NullReferenceException at run time because
// s2 was never initialized to refer to an actual Student object ...
s2.Name = "Mary";
// ... and as soon as the exception is detected by the runtime, execution
// jumps out of the try block -- none of the remaining code in
// this try block will be executed -- and into the first catch block
// below that is found to match a NullReferenceException, if any.
s1.Major = "MATH";
S2.Major = "SCIENCE";
Console.WriteLine("Initialization successfully completed.");
} // end of try block
//Pseudocode.
catch (UnrelatedExceptionType e1) {
// exception handing code fo this type of (hypothetical) exception
// goes here ... but, since our example doesn't involve throwing this
// particular type of exception at run time, this catch block will be
// skipped over without being executed.
Console.WriteLine("UnrelatedExceptionType was detected ...");
} // end of catch (UnrelatedExceptionType e1)
catch (NullReferenceException e2) {
// Here where we place the code for what the program should do if
// a null reference ws detected at run time.
Console.WriteLine("Whoops -- we forgot to initialize all of the students!");
} // end of catch (NullReference Exception e2)
finally {
// This code gets executed whether or not an exception occured; that is,
// whether we made it through the try block without any exceptions being
// thrown, or whether one of the catch blocks was triggered.
Console.WriteLine("Finally");
} // end of finally
// After the finally block executes, control transfers to the
// line of code immediately following block.
Console.WriteLine("Continuing along our merry way ...");
}
}
// This class has the simple name "Student".
using System;
namespace Students
{
public class student {
private string name;
private string major;
public string Name {
get{
return name;
}
set {
name = value;
}
}
public string Major {
get{
return name;
}
set {
major = value;
}
}
}
}
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Well, at first glance, I am not sure why you have your class in a namespace and your main method seems to not be in a namespace. Does that even compile ? If it does, it looks like this will work, if by work you mean to show how a null reference exception works. What is the question/issue ?
Christian Graus
Driven to the arms of OSX by Vista.
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Thank you for answering. I was not sure, I thought you need to initialize namespace for class. However, in main method you link the programmer-define namespace with "using".
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What do you mean 'you' ? You wrote this code, right ? I didn't. Or do you mean it generically ? Are you asking about code you wrote, or code you found somewhere ? What's the question ? Does the code work ? It looks to me like it should. 'using' is all you need to automatically scope an entire namespace. You don't initialise a namespace, that's not possible at all.
Christian Graus
Driven to the arms of OSX by Vista.
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I wrote the code. I meant generically, looking for a suggestion, how would you handle this particular case. The code works fine.
I appreciate your help.
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hello all
i want to set up a serial port communication thru the C# application in which the data from the system (the application) would send the data to the microcontroller. the Microcontroller is having the UART interface to accept and send data i believe...
How is this achieved thru C#.net...
Socket programming || Serial port Programming
i awit for u r valuable suggestions
Thanks
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This[^] is the best reply I have ever seen for your question. Please don't repost.
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I'm inclined to agree with you. 
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I'm trying to serialize one of my classes: "ShapeRectangle.cs" to a stream using the BinaryFormatter. I feel that I have a good understanding of serialization which is why this problem is confusing me!
When trying to serialize "ShapeRectangle", an exception is thrown saying that one of my other classes: "ShapeManager.cs" is: "..not marked as Serializable". "ShapeRectangle" has no reference to "ShapeManager" except through an event that it is registered as a listener: (PaintRequest). I tried marking the event: "PaintRequest" as [NonSerializable] but the complier won't allow it!
How can I ONLY serialize the ShapeRectangle class without serializing the ShapeManager class?
Thanks,
Richard
My code this week has no errors. But it's Monday morning and I haven't got out of bed.
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How would I make an application in C#, that the user cannot close the application with Alt-F4? Any help would be appreciated! 
Thanks,
Josh
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Maybe you cant try this, let me know if it works!
[DllImport("user32.dll")]
private static extern ushort GetKeyState(byte nVirtKey);
private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
if (GetKeyState(115) > 1 && (GetKeyState(0xA4) > 1 || GetKeyState(0xA5) > 1))
e.Cancel = true;
}
Saludos!!
____Juan
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As long as you let the user exit somehow.
Generally it's better to put up a "Are you sure?" dialog.
Other than that... here[^] is a link to a similar question (which a simple search may have found).
And this[^] one.
modified on Tuesday, December 9, 2008 10:58 PM
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It can be done easily by overriding ProcessCmdKey in your form.
protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
{
if (msg.Msg == WM_SYSKEYDOWN)
{
switch (keyData)
{
case System.Windows.Forms.Keys.Alt | System.Windows.Forms.Keys.F4:
return true;
}
}
return false;
}
If you need to handle the System menu's close button and / or the X buttonas well then have a look at my Movement restricted dialog form[^] article. It handles all these on dialog forms but it can be applied to any form at all.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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I`m frustrated! Okay,I have Windows Application in C# which has Excel Embedded in it via WebBrowser. I can`t overwrite this file with the changes I make cause the file is locked. I tried a lot of things, but this seems to be a know issue. I can save the changes I make to the Excel File by using [Cntrl + S]. What I`m tying to do is have the users click a button which in turn does Cntrl + S. I can`t seem to get this working. Here is the code I`m playing with.
[DllImport("User32.DLL")]
public static extern int SendMessage(IntPtr hWnd, UInt32 Msg, Int32 wParam, Int32 lParam);
public const Int32 WM_KEYDOWN = 0x100;
public const Int32 WM_CHAR = 0x102;
public const Int32 WM_KEYUP = 0x101;
public const Int32 SDown = 0x220001;
public const Int32 SUp= 0x0220001; //0xC0220001
public const Int32 CtrlDown = 0x11D0001;
public const Int32 CtrlUp = 0x11D0001; // 0xC11D0001
private void button2_Click(object sender, EventArgs e)
{
SendMessage(this.Handle, WM_KEYDOWN, 0x11, CtrlDown);
SendMessage(this.Handle, WM_KEYDOWN, 0x53, SDown);
SendMessage(this.Handle, WM_CHAR, 0x7, SDown);
SendMessage(this.Handle, WM_KEYUP, 0x53, SUp);
SendMessage(this.Handle, WM_KEYUP, 0x11, CtrlUp);
}
Or is there anyother way to save the file? All replies are greatly appreciated.
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This is a nasty hack. Can you do a saveas and then close the spreadsheet, delete the old file and rename the new one ? Seems like less of a hack to me than sendmessage is.
Christian Graus
Driven to the arms of OSX by Vista.
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I tried that too, the web browser locks up the file. Also I can`t save the changes made to the excel file.
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