c# - 为什么 WinForms 应用程序默认是 STAThread？

Question

当您使用 Visual Studio 创建一个空的 WinForms 应用程序时，该模板在主应用程序类中具有 STAThread 属性。

我一直在阅读一些关于它的文档，但我不确定我是否完全理解它。

我真的有一些问题:

1. 为什么添加这个属性？
2. 这是什么意思？
3. 如果删除此属性会怎样？

Answer 1

引自an MSDN blog ,

When the STAThreadAttribute is applied, it changes the apartment state of the current thread to be single threaded. Without getting into a huge discussion about COM and threading, this attribute ensures the communication mechanism between the current thread and other threads that may want to talk to it via COM. When you're using Windows Forms, depending on the feature you're using, it may be using COM interop in order to communicate with operating system components. Good examples of this are the Clipboard and the File Dialogs.