C# 在运行时指定泛型集合类型参数

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时间:2020-08-04 06:21:51  来源:igfitidea点击:

Specifying generic collection type param at runtime

c#genericscastingruntime

提问by tim

I have:

我有:

class Car {..}
class Other{
  List<T> GetAll(){..}
}

I want to do:

我想要做:

Type t = typeof(Car);
List<t> Cars = GetAll<t>();

How can I do this?

我怎样才能做到这一点?

I want to return a generic collection from the database of a type that I discover at runtime using reflection.

我想从我在运行时使用反射发现的类型的数据库中返回一个泛型集合。

采纳答案by Tron

Type generic = typeof(List<>);    
Type specific = generic.MakeGenericType(typeof(int));    
ConstructorInfo ci = specific.GetConstructor(Type.EmptyTypes);    
object o = ci.Invoke(new object[] { });

回答by Nathan W

You could use reflection for this:

您可以为此使用反射:

Type t = typeof(Car);
System.Type genericType= generic.MakeGenericType(new System.Type[] { t});
Activator.CreateInstance(genericType, args);