C# 禁用窗口激活

如果界面点击时，不想让窗口激活，可以按如下操作：

    public MainWindow()
    {
        InitializeComponent();
        SourceInitialized += OnSourceInitialized;
    }
    private void OnSourceInitialized(object sender, EventArgs e)
    {
        var handle = (PresentationSource.FromVisual(this) as HwndSource).Handle;
        var exstyle = User32.GetWindowLong(handle, GWL_EXSTYLE);
        User32.SetWindowLong(handle, GWL_EXSTYLE, new IntPtr(exstyle.ToInt32() | WS_EX_NOACTIVATE));
    }
    public const int WS_EX_NOACTIVATE = 0x08000000;
    public const int GWL_EXSTYLE = -20;

User32函数：

    [DllImport("user32.dll", EntryPoint = "GetWindowLong")]
    public static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex);

    [DllImport("user32.dll", EntryPoint = "SetWindowLong")]
    public static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);