[英]How to reference current class type using generics
I have a base class, with a method, where I would like to use generics to force the coder to use a generic expression on the current class: 我有一个基类,有一个方法,我想使用泛型来强制编码器在当前类上使用泛型表达式:
public class TestClass
{
public void DoStuffWithFuncRef<T>(Expression<Func<T, object>> expression) where T : TestClass
{
this.DoStuffWithFuncRef(Property<T>.NameFor(expression));
}
}
Now, I would like to force T to be of the type of the instantiated class, which I hope will the cause the C# compiler to automatically understand the generic type to use. 现在,我想强制T为实例化类的类型,我希望这将导致C#编译器自动理解要使用的泛型类型。 Eg I would like to avoid coding the doStuff method below, where I have to specify the correct type - but rather use the doStuffILikeButCannotGetToWork method:
例如,我想避免编写下面的doStuff方法,我必须指定正确的类型 - 而是使用doStuffILikeButCannotGetToWork方法:
public class SubTestClass : TestClass
{
public string AProperty { get; set; }
public void doStuff()
{
this.DoStuffWithFuncRef<SubTestClass>(e => e.AProperty);
}
public void doStuffILikeButCannotGetToWork()
{
this.DoStuffWithFuncRef(e => e.AProperty);
}
}
Is this possible? 这可能吗? Should I be doing this in a different way?
我应该以不同的方式做这件事吗?
Make the base class itself generic: 使基类本身通用:
public class TestClass<T> where T : TestClass<T>
{
public void DoStuffWithFuncRef(Expression<Func<T, object>> expression)
{
this.DoStuffWithFuncRef(Property<T>.NameFor(expression));
}
}
and derive from it: 并从中得出:
public class SubTestClass : TestClass<SubTestClass> {
// ...
}
If you need to have an inheritance hierarchy with a single root, inherit the generic base class from another non-generic version: 如果需要具有单个根的继承层次结构,则从另一个非泛型版本继承通用基类:
public class TestClass { ... }
public class TestClass<T> : TestClass where T : TestClass<T>
Of course you should probably make the base classes abstract. 当然你应该把基类抽象化。
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