確定另一個進程中的UI線程

Question

C＃中可能確定由我的進程打開的另一個應用程序中的哪個線程是UI線程？

Answer 1

@HansPassant早已answered it on MSDN forums：

using System.Diagnostics; 
... 
public static ProcessThread GetUIThread(Process proc) { 
    if (proc.MainWindowHandle == null) return null; 
    int id = GetWindowThreadProcessId(proc.MainWindowHandle, IntPtr.Zero); 
    foreach (ProcessThread pt in proc.Threads) 
    if (pt.Id == id) return pt; 
    return null; 
} 

[System.Runtime.InteropServices.DllImport("user32.dll")] 
private static extern int GetWindowThreadProcessId(IntPtr hWnd, IntPtr procid);