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Don't forget about all the articles in the .NET Framework SDK besides those in the class library. There is a pretty big selection of articles about threading in .NET at http://msdn.microsoft.com/library/en-us/cpguide/html/cpconthreading.asp[^] which also includes a lot of examples. Many of the overviews should even discuss threading in general for those not familiar with threads.
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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I'v been converting some classes I wrote in VB.net to stick them in a C# DLL, but have come accross some wierd irregularities in the .net architecture.
Firstly, the C# compiler will not allow me to explicity pass the value of one numerical variable into an enumerated data type, whereas VB allowed it, and MSDN swears blind it should. For instance:
VB: mnFog(x, y) = Convert.ToByte(sChar) - works fine
C#: mcFog[nLocX, nLocY] = Convert.ToByte(sChar); - Cannot implicitly convert type 'byte' to 'ThisEnum'
The enum in question is derived from a byte.
Secondly, C# just doesnt "see" some methods and properties which VB can use. For instance, in Microsoft.Data.Odbc the OdbcDataReader has an Item collection which allows its user to retrieve a field by its SQL name, instead of its column number (like the .Get[Type]() functions).
See for yourself, reference the DLL, find "Microsoft.Data.Odbc.OdbcDataReader.Item" in the object browser, then try and use it.
Has anyone else experienced these sort of problems?
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dalm wrote:
Cannot implicitly convert type 'byte' to 'ThisEnum'
Cast your value you pass, so if you have a function sig. which has an enum as a parameter such as this:
int SomeFunc(ThisEnum e);
and you know the enum value, simply cast it when you make the method call:
int a = 2;
SomeFunc((ThisEnum)a);
dalm wrote:
Secondly, C# just doesnt "see" some methods and properties which VB can use. For instance, in Microsoft.Data.Odbc the OdbcDataReader has an Item collection which allows its user to retrieve a field by its SQL name, instead of its column number (like the .Get[Type]() functions).
C# doesn't syntactically reference items like VB.NET does, it uses the [] syntax instead.
- Nick Parker
My Blog
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Hi,
I'm desperate: I cannot eliminate that fastidious flicker that occurs when a panel is redrawn (it has to been redrawn every 150ms so it's not a CPU issue).
I've tried with
this.SetStyle( ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer,true);<br /> after the "InitializeComponent();" call, but it doesn't help.
Then I tried doing all drawing operations on a Bitmap, and at the end draw the Bitmap on the form: no relevant effects. (a sort of manual doubleBuffer)
the source code can be found at this URL:
http://utenti.lycos.it/yuppygames/codeproject/flicker.zip
Please, can you check my code or suggest another method?
thank you
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Drawing the bitmap directly on to your form instead of using a Panel will help.
Get rid of panel1 completely and move the drawing code to an override of Form1. Try
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint (e);
e.Graphics.DrawImage( //draw shade shade
barran,
new Rectangle(160, 4, 299, 32), // destination rectangle
0.0f, // source rectangle x
0.0f, // source rectangle y
299, // source rectangle width
32, // source rectangle height
GraphicsUnit.Pixel,
imageAtt);
e.Graphics.DrawImageUnscaled(temp2,new Rectangle(160+xtitolo,7,287,27)); //draw title
}
Then in timertitolo_Tick method Invalidate() the form rather than panel1
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thank you very much.
I did what you said and now it works.
I can't believe it was panel's fault!
I created that panel because I wanted to avoid repainting every single pixel of the form thinking it was faster 
if anyone wants to see the correct code, click here:
http://utenti.lycos.it/yuppygames/codeproject/flicker2.zip
thank you again colderthanfusion
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Hi everybody:
I'm doing my first application in .NET.
I know how use in my application the Visual Xp Styles.
//before running in main form.
Application.EnableVisualStyles()
But, is not exactly that I want. I only want get, at runtime, the name ( or any other ID ) of the current actived Theme from OS Windows, and (if is XP) current actived Visual Style.
Can anybody help me? 
Advanced Thanks.
Best Regards.
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look out for WMI. It's in the Namespace System.Management
scio me nihil scire
My OpenSource(zlib/libpng License) Engine:
http://sourceforge.net/projects/rendertech
Its incurable, its a Pentium division failure.
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Try poking around in the Visual Styles Reference[^] of MSDN. You will want to look at OpenThemeData() and various other functions depending on what you are looking for.
- Nick Parker
My Blog
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P/Invoke GetCurrentThemeName from the uxtheme.dll library:
[DllImport("uxtheme.dll", CharSet=CharSet.Unicode)]
private static extern void GetCurrentThemeName(
out string themeFileName,
int maxFileNameChars,
out string colorSchemeName,
int maxSchemaNameChars,
out string sizeName,
int maxSizeChars);You should only call this if theming is supported, otherwise an exception will be thrown (since uxtheme.dll won't be found on older systems). You can do this like so:
Version v = OSFeature.GetVersionPresent(OSFeature.Feature.Themes);
if (v != null)
{
}You should also P/Invoke IsThemeActive to see if the theming is even active for the current OS:
[DllImport("uxtheme.dll")]
private static extern bool IsThemeActive();Again, only call this if theming is supported by the OS.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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Hello,
I have a .aspx.cs file and a group of .cs files I need to compile together. When I try this on Visual Studio .NET, there are no compile issues, but when I try to execute the file, it comes across a literal form control ("error_tags") and gives error "type or namespace cannot be found".
The class in the .aspx.cs files inherits from a base class in the .cs file. The base class contains the definition "public Literal error_tags;" Is the issue that the .cs files are not being compiled?
Previously, when I was compiling my .dlls from the command line and moving them to the bin folder I had no issues.
Any ideas?
Thanks.
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Is the .aspx referencing the right class in the code behind ?
The 'Page' directive should have the 'Inherits' attribute:
Inherits="YourNameSpace.YourClass"
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Yes, the .aspx reference is fine - like I said, things were working fine when compiling from the command line. It has to do (I believe) with compiling in Visual Studio .NET.
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The <%@ Page%> should inherit from the class defined in the .aspx.cs file, as well as contain the name of the assembly in which that class is contained. If the class in that file inherits from another class defined in another .cs file, that latter class should derive from System.Web.UI.Page.
If you right-click on the files, select Properties, and examine the "Build Action" property, these should say "Compile". This is the default build action for .cs files. If the project compiles all the files set for compilation and there are no build problems, then all your Types are being resolved correctly. The only problem would be that the Inherits attribute of the <%@ Page%> declaration probably isn't referencing the right Type, and / or the CodeBehind attribute does not specify the path to the correct .aspx.cs file.
Finally, make sure that the Liberal error_tags class is declared as public, protected (recommended), internal, or protected internal. If it is declared as private no class - including subclasses - can access it without using reflection (which is expensive and not a very good design).
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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I'v never used XML before today, and I have a small query. With Microsofts XML namespaces, is it be possible to pass variables taken from a serialised object through (set) property procedures?
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dalm wrote:
With Microsofts XML namespaces, is it be possible to pass variables taken from a serialised object through (set) property procedures?
What exactly do you mean? If you're using the XML Serialization classes from System.Xml.Serialization, then public properties are serialized by default (you can control this with the attributes like XmlElementAttribute and XmlAttributeAttribute. When deserializing, the values are assigned to the properties again via the set accessor so any code you have in the set accessors will be run.
For more information - including examples - on XML Serialization, see http://msdn.microsoft.com/library/en-us/cpguide/html/cpconintroducingxmlserialization.asp[^].
-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----
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When I use a manifest file to enable windows xp themes the calendar control get seriously screwed up. When a range is selected the painting isn't done properly. Has anyone ran into this before? Any solutions to this?
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Is it possible to make ANY string "clickable", just like http:// links can be clicked (if you turn on detect URLS), in a richtextbox? Or maybe make an icon, picture or other objects "clickable"?
/Fredrik
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I think you have to write yout custom richtextbbox control or use axBrowser control.
Mazy
No sig. available now.
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Just add a handler to the LinkClicked event, something such as the following will work:
RichTextBox input;
input.LinkClicked += new LinkClickedEventHandler(Link_Clicked);
protected void Link_Clicked(object sender, LinkClickedEventArgs e)
{
System.Diagnostics.Process.Start(e.LinkText);
}
- Nick Parker
My Blog
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But this only works for URLs, I want it to work for ANY type of string..
Fredrik
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Sorry, I didn't see that. I believe you are going to have to subclass the WndProc and watch for EN_LINK message. To receive this message you will also need to send the EM_SETEVENTMASK message as it specifies the event messages to send to the parent window. You should be able to cast the lparam to a ENLINK structure which contain helpful information such as a CHARRANGE structure that will tell you the range of characters. This should at least point you in the right direction but it will require a little work. Hope this helps.
- Nick Parker
My Blog
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I am developing a program in which there is dynamically generation of some fields let us take the example of label control now i dynamically generate them after taking input from user. when the user right click on any label i will show him a context menu through which he can select the font, color etc and on the selection of that a different dialog box will be selected now Actual problem is that after the selection of that color or font i want to know on which label control user has right clicked on how i will get that . sorry for poor english
Thanx in advance
Regards
INAM
Inam
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The default delegate is void Delegate(object sender, EventArgs e)
you can get it by casting sender to label
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If I understand you correctly, you need to know control which triggered context menu when you handle MenuItem.Click event. When you handle this event sender is a context menu so it wont't help you much. However, if you handle ContextMenu.Popup sender is the control triggering the event. What you can do is this: create a field in the class where you handle events
object controlWhichTriggeredEvent;
Then create a handler for ContextMenu.Popup:
private void YourContextMenu_Popup(object sender, System.EventArgs e)
{
controlWhichTriggeredEvent = sender;
}
Now when you handle MenuItem.Click , controlWhichTriggeredEvent will contain the latest control clicked by user (you will have to cast it to label of any other control).
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