对象与SetValue和枚举的目标类型不匹配

Question

我尝试从CodeProject调整本教程来尝试更改一个dynamic在这种情况下将int变为简单的东西Enum.

如果我们这样定义Enum:

public Enum MyEnum { Zero = 0, One = 1, Two = 2 }

以及设置MyObject包含以下内容的类的值的方法的内容MyEnum:

var baseType = propertyInfo.PropertyType.BaseType; //`propertyInfo` is the `PropertyInfo` of `MyEnum`

var isEnum = baseType != null && baseType == typeof(Enum); //true in this case

dynamic d;

d = GetInt(); 

//For example, `d` now equals `0`

if (isEnum)
    d = Enum.ToObject(propertyInfo.PropertyType, (int)d); 

//I can see from debugger that `d` now equals `Zero`

propertyInfo.SetValue(myObject, d); 

//Exception: Object does not match target type

关于为什么会发生这种情况的任何想法？

Answer 1

"对象与目标类型不匹配"表示该类型myObject不是propertyInfo从中获取的类型的实例.换句话说,您尝试设置的属性是一种类型,并且myObject不是该类型的实例.

为了显示:

var streamPosition = typeof(Stream).GetProperty("Position");

// "Object does not match target type," because the object we tried to
// set Position on is a String, not a Stream.
streamPosition.SetValue("foo", 42);