如何使用OpCodes.Call生成此代码 [英] How to use OpCodes.Call to generate this code

问题描述

此问题与以下内容有关：使用代码铸造集合项

This question is related to: Casting items of a collection with code generation

由于上一个问题还不够清楚，因此我需要准确地提供帮助。

Since the previous question was not clear enough, here is what I need help with precisely.

如何使用OpCodes.Call生成此代码：

How to use OpCodes.Call to generate this code:

return Enumerable.ToList<Potato>(Eumerable.Cast<Potato>(_proxyPotatoes));

以下是我要执行的操作的示例：

Here is an example of what I'm trying to do:

public class Potato
{
}

public class ProxyPotato : Potato
{    
}

public class Stew
{
  private ICollection<ProxyPotato> _proxyPotatoes;

  //This is the code I would like to generate (specialy the cast part)
  public ICollection<Potato> Potatoes { get { return _proxyPotatoes.Cast<Potato>().ToList(); } }
}

编辑1

在@zmbq的建议之后，这里是我需要生成的IL的两行：

After the suggestion of @zmbq here is the two line of IL i need to generate:

call class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0> [System.Core]System.Linq.Enumerable::Cast<class Maxime.Potato>(class [mscorlib]System.Collections.IEnumerable)

call class [mscorlib]System.Collections.Generic.List`1<!!0> [System.Core]System.Linq.Enumerable::ToList<class Maxime.Potato>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>)

推荐答案

两个方法调用应类似于：

The two method calls should look something like:

ilg.Emit(OpCodes.Call, typeof(Enumerable).GetMethod("Cast").MakeGenericMethod(typeof(Potato)));
ilg.Emit(OpCodes.Call, typeof(Enumerable).GetMethod("ToList").MakeGenericMethod(typeof(Potato)));

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