为什么使用Delegate.CreateDelegate得到这个错误'绑定到目标方法'? [英] Why do I get this error 'binding to target method' using Delegate.CreateDelegate?
本文介绍了为什么使用Delegate.CreateDelegate得到这个错误'绑定到目标方法'?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
两种方法之间的唯一区别是因为参数。
public class MyClass
{
public string Name {get;组;
}
[TestFixture]
public class Test
{
public IEnumerable< T> TestMethod< T>(int i)
{
// do something
return null;
}
public IEnumerable< T> TestMethod2< T>()
{
// do something
return null;
}
[Test]
public void Run()
{
MethodInfo mi = this.GetType()。GetMethod(TestMethod)。 MakeGenericMethod(typeof(MyClass));
var del = Delegate.CreateDelegate(typeof(Func< IEnumerable< MyClass>)),this,mi);
var list =(IEnumerable< MyClass>)del.DynamicInvoke(0);
}
[Test]
public void Run2()
{
MethodInfo mi = this.GetType()。GetMethod(TestMethod2)。 MakeGenericMethod(typeof(MyClass));
var del = Delegate.CreateDelegate(typeof(Func< IEnumerable< MyClass>)),this,mi);
var list =(IEnumerable< MyClass>)del.DynamicInvoke();
}
}
解决方案
问题在这里:
var del = Delegate.CreateDelegate(typeof(Func< IEnumerable< MyClass> );
你已经说过要将你的方法绑定到一个 Func< IEnumerable&MyClass> ;>
委托,但实际的方法应该是 Func< int,IEnumerable< MyClass>>
(因为 int
参数 TestMethod
)。以下内容应该更正:
var del = Delegate.CreateDelegate(typeof(Func< int,IEnumerable< MyClass> ,这个,mi);
The Run2 method is run. But the Run method is not run. What is the reason ? The only difference between two methods is because parameter.
public class MyClass
{
public string Name { get; set; }
}
[TestFixture]
public class Test
{
public IEnumerable<T> TestMethod<T>(int i)
{
//do something
return null;
}
public IEnumerable<T> TestMethod2<T>()
{
//do something
return null;
}
[Test]
public void Run()
{
MethodInfo mi = this.GetType().GetMethod("TestMethod").MakeGenericMethod(typeof(MyClass));
var del = Delegate.CreateDelegate(typeof(Func<IEnumerable<MyClass>>), this, mi);
var list = (IEnumerable<MyClass>)del.DynamicInvoke(0);
}
[Test]
public void Run2()
{
MethodInfo mi = this.GetType().GetMethod("TestMethod2").MakeGenericMethod(typeof(MyClass));
var del = Delegate.CreateDelegate(typeof(Func<IEnumerable<MyClass>>), this, mi);
var list = (IEnumerable<MyClass>)del.DynamicInvoke();
}
}
解决方案
The problem is here:
var del = Delegate.CreateDelegate(typeof(Func<IEnumerable<MyClass>>), this, mi);
You've said to bind your method to a Func<IEnumerable<MyClass>>
delegate, but the actual method should be Func<int, IEnumerable<MyClass>>
(because of the int
argument to TestMethod
). The following should correct it:
var del = Delegate.CreateDelegate(typeof(Func<int, IEnumerable<MyClass>>), this, mi);
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