System.Web.HttpContext.Current.Request["code"] "";

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System.Web.HttpContext.Current.Request[

System.Web.HttpContext.Current.Request["code"] "";
System.Web.HttpContext.Current.Request["code"] "";

System.Web.HttpContext.Current.Request["code"] "";
是C#的可空判断操作符,
例如 var test= B ,就是如果A为null(也就是空),那么就把B赋给test;
如果A不为空,那么就把A赋给test
System.Web.HttpContext.Current.Request["code"] "";
意思就是说:获取Web请求的code对象(也就是System.Web.HttpContext.Current.Request["code"] ),如果Code对象不为空(不为null),那么这个表达式返回的就是Code对象,
否则表达式返回的是 空字符串("")

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