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[WinForm] .NET/C# sends messages based on PostMessage broadcasts

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Posted on 3/2/2026 8:41:24 PM | | | |
Requirements: Windows system deploys multiple software clients, when software A performs an operation, broadcasts a message, and other software receives the message and executes the corresponding operation logic.

PostMessageA function (winuser.h):The hyperlink login is visible.

Place a message in a message queue that is associated with the thread that created the specified window and returns without waiting for the thread to process the message.

For example, if you broadcast a message and the software that receives the message will display the foreground, cancel and minimize it.

The broadcast message code is as follows:
Create a new winform program, and after receiving the message, the front office will display the following code:
The renderings are as follows:





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