常规 不建议
string name = "张三";
string message = "Hello" + name;
优化后
string name = "张三";
string message = string.Format("Hello {0}", name);
在升级
string name = "张三";
string message = $"Hello {name}";
标签:string,张三,占位,message,Hello,name
From: https://www.cnblogs.com/IT-IOS-MAN/p/16891845.html