[Suggestion] Does not explain whether thread safety?

[CeciAc]

@ahdung commented on Sun Mar 10 2019

不说明一下是否线程安全？老版本都有这个说明的。

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文档详细信息

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• ID: 62a87d45-f88a-6952-7efe-4178475b3f4b
• Version Independent ID: 5e331fc8-b855-b602-b47e-dc2e4e1b6a26
• Content: Pen.Width Property (System.Drawing)
• Content Source: xml/System.Drawing/Pen.xml
• Product: dotnet-api
• GitHub Login: @dotnet-bot
• Microsoft Alias: dotnetcontent

[CeciAc]

Hi team,
The user is reporting there's is information which was included in previous versions of the document but not anymore.
Rough Translation:

Do not explain whether it is thread safe? The old version has this description.

[ahdung]

@CeciAc Thanks for your help.

[KalleOlaviNiemitalo]

The implementation of Pen.Width calls the GDI+ flat API without locking, and GDI+ objects are not thread-safe, so the Pen.Width property is not thread-safe, either.

I expect the same will be true for most reference types in System.Drawing, such as FontFamily and Brush. Note that the System.Drawing.Brushes class creates separate SolidBrush instances for each thread.

[ahdung]

@KalleOlaviNiemitalo Thank you.