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}";
string name = "张三"；
string message = "Hello" + name;
string name = "张三";
string message = string.Format("Hello {0}", name);
string name = "张三";
string message = $"Hello {name}";
本文标题：占位符
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