[英]C# - Cast generic interface to generic class that pass type <T> that is determined at runtime
How can I cast a generic class with generic interface by passing Type that is determined at runtime? 如何通过传递在运行时确定的Type来转换具有泛型接口的泛型类?
public class SomeDataChanged
{
public string EventName { get; set; }
}
public class MessageSub<T> where T : class
{
public IMessageBus Bus { get; set; }
public ISubscription<T> Sub { get; set; }
}
public interface IDataChangedService<T> where T : class
{
MessageSub<T> ProcessData(string topic, string subscription);
}
public class DataChangedService<T> : IDisposable, IDataChangedService<T> where T : class
{
public MessageSub<T> ProcessData(string topic, string subscription)
{
// Some code
}
// More code
}
I have used reflection to pass type determined at runtime to the generic class using the following thread . 我使用反射将运行时确定的类型传递给使用以下线程的泛型类。 But not getting how to cast it to another generic type. 但是没有得到如何将它转换为另一种泛型类型。
class Test
{
static void Main()
{
string topic = "OrderChanged";
string subscription = "MyUi";
string typeName = "OrderDataChanged";
Type T = Type.GetType(typeName);
Type genericClass = typeof(DataChangedService<>);
Type constructedClass = genericClass.MakeGenericType(T);
//How to cast another generic interface to my constructed class?
var obj = (IDataChangedService<T>)Activator.CreateInstance(constructedClass);
//Also how to return generic type object?
MessageSub<T> msgSub = obj.ProcessData(topic, subscription);
// and, then some code that use msgSub
}
}
You can't do IDataChangedService<T>
. 你不能做IDataChangedService<T>
。 The T
is a run-time variable of type System.Type
, and not a compile-time type represented by the string typeName
. T
是System.Type
类型的运行时变量,而不是字符串typeName
表示的编译时类型。 To use generic parameters the type must be compile-time. 要使用泛型参数,类型必须是编译时。
You need to introduce some non-generic types to make this work. 您需要引入一些非泛型类型才能使其工作。
Something like this: 像这样的东西:
public interface IMessageSub { }
public class MessageSub<T> : IMessageSub where T : class
{
public IMessageBus Bus { get; set; }
public ISubscription<T> Sub { get; set; }
}
public interface IDataChangedService
{
IMessageSub ProcessData(string topic, string subscription);
}
public interface IDataChangedService<T> : IDataChangedService where T : class
{
MessageSub<T> ProcessData(string topic, string subscription);
}
public class DataChangedService<T> : IDataChangedService<T> where T : class
{
IMessageSub IDataChangedService.ProcessData(string topic, string subscription)
{
return this.ProcessData(topic, subscription);
}
public MessageSub<T> ProcessData(string topic, string subscription)
{
// Some code
}
// More code
}
Then you can do: 然后你可以这样做:
var obj = (IDataChangedService)Activator.CreateInstance(constructedClass);
obj.ProcessData(topic, subscription);
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