C# WPF怎么通过弹窗来禁止用户与电脑桌面其它软件交互，只有点击弹窗上的按键才可以解除禁止

可以使用WinAPI函数来实现禁止用户与电脑桌面其他软件交互的效果，具体步骤如下：

1. 定义WinAPI函数，包括FindWindowEx、GetWindowLong、SetWindowLong、EnableWindow等。

[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);

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

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

[DllImport("user32.dll")]
private static extern bool EnableWindow(IntPtr hWnd, bool bEnable);

2. 获取当前应用程序的主窗口句柄，并根据需要设置其样式为无边框窗体。

IntPtr handle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
int style = GetWindowLong(handle, -20);
SetWindowLong(handle, -20, style | 0x80000 | 0x20);

3. 查找桌面窗口句柄，并禁用其所有子窗口。

IntPtr desktopHandle = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "Progman", null);
if (desktopHandle != IntPtr.Zero)
{
    IntPtr shellHandle = FindWindowEx(desktopHandle, IntPtr.Zero, "SHELLDLL_DefView", null);
    if (shellHandle != IntPtr.Zero)
    {
        IntPtr listViewHandle = FindWindowEx(shellHandle, IntPtr.Zero, "SysListView32", null);
        if (listViewHandle != IntPtr.Zero)
        {
            EnableWindow(listViewHandle, false);
        }
    }
}

4. 在弹窗上添加一个按钮，当用户点击该按钮时，解除禁止。

private void Button_Click(object sender, RoutedEventArgs e)
{
    EnableWindow(listViewHandle, true);
}

完整代码如下：

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);

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

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

        [DllImport("user32.dll")]
        private static extern bool EnableWindow(IntPtr hWnd, bool bEnable);

        private IntPtr listViewHandle;

        public MainWindow()
        {
            InitializeComponent();

            // 获取当前应用程序的主窗口句柄
            IntPtr handle = new WindowInteropHelper(Application.Current.MainWindow).Handle;

            // 设置窗口样式为无边框窗体
            int style = GetWindowLong(handle, -20);
            SetWindowLong(handle, -20, style | 0x80000 | 0x20);

            // 查找桌面窗口句柄，并禁用其所有子窗口
            IntPtr desktopHandle = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "Progman", null);
            if (desktopHandle != IntPtr.Zero)
            {
                IntPtr shellHandle = FindWindowEx(desktopHandle, IntPtr.Zero, "SHELLDLL_DefView", null);
                if (shellHandle != IntPtr.Zero)
                {
                    listViewHandle = FindWindowEx(shellHandle, IntPtr.Zero, "SysListView32", null);
                    if (listViewHandle != IntPtr.Zero)
                    {
                        EnableWindow(listViewHandle, false);
                    }
                }
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // 解除禁止
            EnableWindow(listViewHandle, true);
        }
    }
}