通过实例化System.Type的一个类型参数的泛型类 [英] Pass An Instantiated System.Type as a Type Parameter for a Generic Class
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问题描述
标题是那种晦涩。我想知道的是,如果这是可能的:
The title is kind of obscure. What I want to know is if this is possible:
string typeName = <read type name from somwhere>;
Type myType = Type.GetType(typeName);
MyGenericClass<myType> myGenericClass = new MyGenericClass<myType>();
显然,MyGenericClass被描述为:
Obviously, MyGenericClass is described as:
public class MyGenericClass<T>
现在,编译器抱怨道:类型或命名空间'的myType可能不会被发现。目前还必须是一个办法做到这一点。
Right now, the compiler complains that 'The type or namespace 'myType' could not be found." There has got to be a way to do this.
推荐答案
没有反映你不能做到这一点。然而,你的与反思可以的做到这一点。这里有一个完整的例子:
You can't do this without reflection. However, you can do it with reflection. Here's a complete example:
using System;
using System.Reflection;
public class Generic<T>
{
public Generic()
{
Console.WriteLine("T={0}", typeof(T));
}
}
class Test
{
static void Main()
{
string typeName = "System.String";
Type typeArgument = Type.GetType(typeName);
Type genericClass = typeof(Generic<>);
// MakeGenericType is badly named
Type constructedClass = genericClass.MakeGenericType(typeArgument);
object created = Activator.CreateInstance(constructedClass);
}
}
请注意:如果您的通用类接受多种类型,您必须包含逗号,当你忽略类型名称,例如:
Note: if your generic class accepts multiple types, you must include the commas when you omit the type names, for example:
Type genericClass = typeof(IReadOnlyDictionary<,>);
Type constructedClass = genericClass.MakeGenericType(typeArgument1, typeArgument2);
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