实现效果:

知识运用:
API函数 GetSystemMetrics //返回与WINDOWS环境有关的信息
实现代码:
private const int SM_CMOUSEBUTTONS = 43;
[DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
public extern static int GetSystemMetrics(int intcount);
private void Form1_Load(object sender, EventArgs e)
{
int intCon = GetSystemMetrics(SM_CMOUSEBUTTONS);
label2.Text = intCon + "个";
}
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