有没有一种方法来设置使用反射结构实例的属性？ [英] Is there a way to set properties on struct instances using reflection?

问题描述

我试着写一些code，设置在结构（重要的是，它是在一个结构属性）的属性和它的失败：

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（所报告的调试器）永远不会被设置为任何东西 - 它停留在0默认值

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

我以前做过很多思考的类上，这一直很好。另外，我知道，与结构打交道时，你需要的，如果设置字段使用FieldInfo.SetValueDirect，但我不知道一个相等的PropertyInfo的。

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

长方形的值被装箱 - 但你失去的是盒装的价值，这是什么东西被修改。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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