有没有办法使用反射在结构实例上设置属性? [英] Is there a way to set properties on struct instances using reflection?

问题描述

我正在尝试编写一些代码来设置结构上的属性(重要的是它是结构上的属性)并且它失败了:

I'm trying to write some code that sets a property on a struct (important that it's a property on a struct) and it's failing:

System.Drawing.Rectangle rectangle = new System.Drawing.Rectangle();
PropertyInfo propertyInfo = typeof(System.Drawing.Rectangle).GetProperty("Height");
propertyInfo.SetValue(rectangle, 5, null);

高度值(由调试器报告)永远不会设置为任何值 - 它保持默认值 0.

The Height value (as reported by the debugger) never gets set to anything - it stays at the default value of 0.

我之前对课程进行了大量反思，并且效果很好.另外，我知道在处理结构时，如果设置字段，则需要使用 FieldInfo.SetValueDirect，但我不知道 PropertyInfo 的等效项.

I have done plenty of reflection on classes before and this has worked fine. Also, I know that when dealing with structs, you need to use FieldInfo.SetValueDirect if setting a field, but I don't know of an equivalent for PropertyInfo.

推荐答案

rectangle 的值被装箱 - 但随后您丢失了装箱的值，也就是正在修改的值.试试这个:

The value of rectangle is being boxed - but then you're losing the boxed value, which is what's being modified. Try this:

Rectangle rectangle = new Rectangle();
PropertyInfo propertyInfo = typeof(Rectangle).GetProperty("Height");
object boxed = rectangle;
propertyInfo.SetValue(boxed, 5, null);
rectangle = (Rectangle) boxed;

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