c# - GetProperty 反射在新属性上产生 "Ambiguous match found"

Question

我怎样才能得到我的属性(property)？当前发生错误 找到不明确的匹配项，请参阅代码中的注释行。

public class MyBaseEntity
{
    public MyBaseEntity MyEntity { get; set; }
}

public class MyDerivedEntity : MyBaseEntity
{
    public new MyDerivedEntity MyEntity { get; set; }
}

private static void Main(string[] args)
{
    MyDerivedEntity myDE = new MyDerivedEntity();

    PropertyInfo propInfoSrcObj = myDE.GetType().GetProperty("MyEntity");
    //-- ERROR: Ambiguous match found
}

Answer 1

Type.GetProperty

Situations in which AmbiguousMatchException occurs ...

...derived type declares a property that hides an inherited property with the same name, by using the new modifier

如果你运行以下命令

var properties = myDE.GetType().GetProperties().Where(p => p.Name == "MyEntity");

您会看到返回了两个 PropertyInfo 对象。一个用于 MyBaseEntity，一个用于 MyDerivedEntity。这就是您收到找到模糊匹配错误的原因。

您可以像这样获取 MyDerivedEntity 的 PropertyInfo:

PropertyInfo propInfoSrcObj = myDE.GetType().GetProperties().Single(p => 
    p.Name == "MyEntity" && p.PropertyType == typeof(MyDerivedEntity));