Developer technologies | Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
How to specify a component icon for .Net 6 WinFroms desinger
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(80, 14.000000000000002%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Aerworker
0
Reputation points
To specify an icon for a component class for .Net 5 and earlier versions it was enough to add a ToolboxBitmapAttribute. But starting form .Net 7 it throws an exception on Linux. So it is impossible to call TypeDescriptor.GetAttributes(type) method without an exception. Now on standard types there is no ToolboxBitmapAttribute (for example BackgroundWorker class). Therefore, there must be another way to set the icon. How to do this now?
Developer technologies | Windows Forms
{count} votes
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Jack J Jun 25,316 Reputation points2023-01-12T05:51:17.2666667+00:00 @Aerworker, Welcome to Microsoft Q&A, based on my test, I could set the icon by using ToolboxBitmapAttribute in .NET 6 winform app. How do you set the attribute? could you provide the code? Please note that we must use the picture that 16-by-16-pixel picture, like the following:
I used the following code:
[ToolboxBitmap("C:\\Users\\Administrator\\Downloads\\bmp_file_99151\\Bmp_file_Icon_16.png")] class MyControl : UserControl { }And show it in the toolbox:
Could you have a check for your code and your picture?
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Aerworker 0 Reputation points
2023-01-12T11:02:22.7133333+00:00 Yes the ToolboxBitmapAttribute works as expected on Windows. But I have a component that can be used on Linux. The the ToolboxBitmapAttribute constructor throws the PlatformNotSupportedException so call to the TypeDescriptor.GetAttributes method fails.(Run the ConsoleAppNet7Icon project from the attached solution in docker) I can't force all programmers to use other methods to obtain attribute list.
It seems there is the other way to set the custom icon as its done for BackgroundWorker class. How it was done?
Program.cs.txt
launchSettings.json.txt
ConsoleAppNet7Icon.csproj.txt
Dockerfile.txt -
Jack J Jun 25,316 Reputation points
2023-01-13T08:42:01.1233333+00:00 @Aerworker, thanks for the feedback, I am configuring the linux environment and will test it later, I will come back if I have an update.
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Aerworker 0 Reputation points
2023-01-24T09:24:44.87+00:00 Is there any news?
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Jack J Jun 25,316 Reputation points
2023-02-02T06:32:10.4233333+00:00 -
Aerworker 0 Reputation points
2023-02-06T16:50:57.0766667+00:00 The application for linux platform is for demonstration that the ToolboxBitmapAttribute can't be used in crossplatform library. It is not necessary to run the application to enshure that it can't work correctly. It is enough to run
dotnet build -r linux-x64command. During the build stage, the System.Drawing.Common.dll library is copied to the to thebin\Debug\net7.0\linux-x64folder. In this library every constructor of the ToolboxBitmapAttribute class throws PlatformNotSupportedException since .Net 7 doesn't support System.Drawing.Common library on Linux platform.The main question is how to add a custom icon in the Visual Studio without ToolboxBitmapAttribute as it done for BackgroundWorker class.
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