==操作符

经常在编程的时候会忽略==和equals的区别。从msdn上得知

For predefined value types, the equality operator (==) returns true if the values of its operands are equal, false otherwise. For reference types other than string, == returns true if its two operands refer to the same object. For the string type, == compares the values of the strings.

对于object而言，它并不是比较value的。