C# fianally 测试

string m(int i)
{
    try 
    {
        if(i==1)
        throw new Exception("sss");

        return "OK";
    }
    catch
    {
        Console.WriteLine("catch Exception");
        return "Exception";
    }

    finally
    {
       Console.WriteLine("finally"); //return "finally";  这里不能写return , 其实相当于 先的到返回值之后，执行这段代码，再返回。
    }

    return "over";
}

Console.WriteLine("resuit= "+m(1));
Console.WriteLine("-----------");
Console.WriteLine("resuit= "+m(2));

https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/intro-to-csharp/hello-world?tutorial-step=1 可以在这里直接运行

if (st?.Age > 13)

等价为如下

if (st != null && st.Age > 13)