//首先导入命名空间
using System.Runtime.InteropServices;
//声明API函数
[DllImport("user32.dll")]
private static extern void LockWorkStation();
//在方法中调用
LockWorkStation();
主要代码片段
[DllImport("user32.dll")]
private static extern void LockWorkStation();
private void btnLock_Click(object sender, EventArgs e)
{
LockWorkStation();
}