如何确定T是泛型中的值类型还是引用类? [英] How to determine whether T is a value type or reference class in generic?

问题描述

我有一个泛型方法，其行为取决于T是引用类型还是值类型.看起来是这样的:

I have a generic method behavior of which depends on T is reference type or value type. It looks so:

T SomeGenericMethod <T> (T obj)
{
  if (T is class) //What condition I must write in the brackets?
   //to do one stuff
  else //if T is a value type like struct, int, enum and etc.
   //to do another stuff
}

我无法像这样重复此方法

I can't duplicate this method like:

T SomeGenericMethod <T> (T obj) where T : class
{
 //Do one stuff
}

T SomeGenericMethod <T> (T obj) where T : struct
{
 //Do another stuff
}

因为他们的签名是相等的.谁能帮我吗?

because their signatures are equal. Can anyone help me?

推荐答案

您可以使用 IsValueType 属性:

You can use the typeof operator with generic types, so typeof(T) will get the Type reference corresponding to T, and then use the IsValueType property:

if (typeof(T).IsValueType)

或者如果您想包括可为空的值类型，就像它们是引用类型一样:

Or if you want to include nullable value types as if they were reference types:

// Only true if T is a reference type or nullable value type
if (default(T) == null)

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