C# 特性之Obsolete

public class TestClass
{
    // 添加Obsolete特性
    [System.Obsolete("请使用新的SendMsg()")]
    public static void ShowMsg()
    {
    }
    public static void SendMsg()
    {
    }
}
class Program
{
    static void Main(string[] args)
    {
        TestClass.ShowMsg();
    }
}