[英]How to call a non-generic method of a class T from a method of a generic class?
I am new to reflection and dependency injection concepts, and I started to run some code in order to understand better.我是反射和依赖注入概念的新手,为了更好地理解,我开始运行一些代码。
I am trying to call a non-generic method of a class T from a method of a generic class that contains a T object.我正在尝试从包含 T object 的通用 class 的方法中调用 class T 的非通用方法。
Consider the following sample code, when I run it I get this:考虑以下示例代码,当我运行它时,我得到了这个:
System.InvalidOperationException: Void DisplayProperty() is not a GenericMethodDefinition. System.InvalidOperationException:无效的 DisplayProperty() 不是 GenericMethodDefinition。 MakeGenericMethod may only be called on a method for which MethodBase.IsGenericMethodDefinition is true. MakeGenericMethod 只能在 MethodBase.IsGenericMethodDefinition 为 true 的方法上调用。
What I am doing wrong?我做错了什么?
using System;
using System.Collections.Generic;
using System.Reflection;
namespace di001
{
class MyDependency
{
private String _property;
public String Property
{
get => _property;
set => _property = value;
}
public void DisplayProperty()
{
Console.WriteLine(Property);
}
}
class DIClass<T>
{
public T obj;
public void DisplayMessage()
{
MethodInfo method = typeof(T).GetMethod("DisplayProperty");
MethodInfo generic = method.MakeGenericMethod(typeof(T));
generic.Invoke(this, null);
}
public DIClass(T obj)
{
this.obj = obj;
}
}
class Program
{
static void Main(string[] args)
{
DIClass<MyDependency> x = new DIClass<MyDependency>(new MyDependency());
x.DisplayMessage();
}
}
}
The line线
MethodInfo generic = method.MakeGenericMethod(typeof(T));
is not necessary at all.根本没有必要。
At this point, when actually executing, T
is not generic since it has been constructed ( T
is the actual type you want).此时,实际执行时, T
不是通用的,因为它已经被构造( T
是您想要的实际类型)。 method
certainly isn't a generic method anyway.无论如何, method
当然不是通用方法。
You should be able to just do你应该能够做到
typeof(T).GetMethod("DisplayProperty").Invoke(...
I also imagine you want to call Invoke
with parameters (obj, null)
我也想像你想用参数调用Invoke
(obj, null)
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