Cannot modify the return value of 'System...ClientRectangle' because it is not a variable
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最近做一个换肤的程序， 在修改窗体的ClientRectangle.Height值的时候出现了题目这样的错误。
后来发现，把鼠标放到ClientRectangle.Height的Height上时， 显示可以进行Get和Set
但 ClientRectangle本身的定义里面只支持Get操作， 而没有Set操作， 它不是一个变量， 是Control类的一个公共属性。
然后发现Control类还有一个公共属性叫ClientSize， 是可读可写的， 所以可以通过这样的方式修改ClientRectangle的值：
Size tmpSize = ClientRectangle.Size;tmpSize.Height--;tmpSize.Width--;ClientSize = tmpSize;Note： ClientSize和ClientRectangle都是值类型。
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