取表达式（第一个）参数的类型，然后说
expression<Func<C, string>> c = x => x.B; Type paramType = c.Parameters[0].Type; // first parameter of expressionvar d = paramType.GetMember((c.Body as Memberexpression).Member.Name)[0];
取表达式（第一个）参数的类型，然后说
expression<Func<C, string>> c = x => x.B; Type paramType = c.Parameters[0].Type; // first parameter of expressionvar d = paramType.GetMember((c.Body as Memberexpression).Member.Name)[0];
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