如何测试反射字段的类型是否为或继承自指定类型

Question

I am iterating through the FieldInfo of a class. I want to be able to test if a given field is of a certain type.

The specific issue is that I want to know all fields that are derived from SortedList . So they are not exactly SortedList , but each one IS a SortedList . Given the field's FieldInfo , how do I test this?

Answer 1

您可以使用IsAssignableFrom方法执行此测试，如下所示：

var isSortedList = typeof(SortedList).IsAssignableFrom(fieldInfo.FieldType);

Answer 2

bool canCast = (fieldInfo.FieldType == typeof(SortedList) ||
               (fieldInfo.FieldType.IsSubclassOf(typeof(SortedList)));

Answer 3

if ((fieldInfo.FieldType == typeof(SortedList)) || fieldInfo.FieldType.IsSubclassOf(typeof(SortedList))
    Console.WriteLine("Field {0} is of type {1}", fieldInfo.Name, typeof(blah.Name));

This code is untested but is roughly what I have used before.

Answer 4

Instead of looking for the SortedList as the type, you can also look for interfaces such as IDictionary, ICollection which SortedList derives from. I provide an interesting read on my blog which gives an example of reflecting for an interface:

Reflect Interface from Unknown Assembly in C#

HTH (From HR down south of you ;-) )