Question

internal interface Rule {
}

private class Rule<T> : Rule {
   //Properties & Other Stuff
}

void method() {
   //For simplicity I used string here. It can be anything when the code is in context
   Type _type = typeof(string); 
   Rule[] _rules;

   //This is causing an error because _type could not be found
   _rules = new Rule<_type>[] { }; 
}

是否可以实例化一个存储在变量中的泛型类？

- 编辑

从我的第一个例子开始，我认为我可以应用相同的概念来调用方法。但似乎我错了。我试图使用newtonsoft json库将字符串反序列化为泛型类型。我发现这个question允许你调用泛型类型的方法。我环顾四周如何将对象转换为_foo，但只能找到类型已知的转换。有什么想法吗？

Using Newtonsoft.Json;


void method() {
   //For simplicity I used string here. It can be anything when the code is in context
   Type _type = typeof(string); 
   Rule[] _rules;

   // ------------------ New Additions ----------------
   var _foo = (Rule[])Array.CreateInstance(typeof(Rule<>).MakeGenericType(_type),0);

   MethodInfo method = typeof(JsonConvert).GetMethod("DeserializeObject");
   MethodInfo generic = method.MakeGenericMethod(_foo.GetType());

   //How do you cast this to a type _myType?
   _rules = generic.Invoke(this, new[] { "JSON Data" });
}

Answer 1

这是可能的，但你必须使用反射：

Type genericTypeDefinition = typeof(Rule<>);
Type genericType = genericTypeDefinition.MakeGenericType(_type);
Rule[] array = (Rule[])Array.CreateInstance(genericType, 0);

使用泛型类型作为变量初始化泛型类

1 个答案: