[英]Why is my C# IS statement not working?
I have the following code, where T is a generic defined as such: 我有以下代码,其中T是通用定义如下:
public abstract class RepositoryBase<T> where T : class, IDataModel
This code works just fine: 这段代码工作得很好:
PropertyInfo propertyInfo = typeof(T).GetProperty(propertyName);
if (propertyInfo.DeclaringType.FullName == typeof(T).FullName) <--- Works just fine
vs this code which evaluates to false vs这个评估为false的代码
PropertyInfo propertyInfo = typeof(T).GetProperty(propertyName);
if (propertyInfo.DeclaringType is T) <-- does not work
What am I doing wrong here? 我在这做错了什么?
is uses type comparison between the two objects. 是在两个对象之间使用类型比较。 So
DeclaringType
is of type Type
and typeof(T)
is of type T
, which are not equal. 因此
DeclaringType
的类型为Type
而typeof(T)
的类型为T
,它们不相等。
var aType = typeof(propertyInfo.DeclaringType);
var bType = typeof(T);
bool areEqual = aType is bType; // Always false, unless T is Type
What you are looking for is 你在寻找什么
TypeIsAssignableFrom TypeIsAssignableFrom
if (propertyInfo.DeclaringType.IsAssignableFrom(typeof(T)))
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