英文:
How to get MethodInfo of static method with generic parameters when method ambiguity occurs?
问题
以下是您要翻译的内容：
我想要获取的方法是来自 **System.Reactive** 的 `Observable.Return`。
它的定义如下：
```csharp
public static IObservable<TResult> Return<TResult>(TResult value)
{
...
}
我尝试了以下代码：
Type observableType = typeof(Observable);
MethodInfo returnMethodInfo = observableType.GetMethod("Return");
var genericMethodInfo = returnMethodInfo.MakeGenericMethod(typeof(int));
问题在于我得到了一个错误消息：
找到多个匹配项。
我猜这是因为还有另一个名为 "Return" 的方法：
public static IObservable<TResult> Return<TResult>(TResult value, IScheduler scheduler)
{
...
}
我应该如何调用 GetMethod 来获取我想要的方法的 MethodInfo？
英文:
The method I would like to obtain is Observable.Return from System.Reactive.
It's defined like this:
public static IObservable<TResult> Return<TResult>(TResult value)
{
...
}
I've tried with
Type observableType = typeof(Observable);
MethodInfo returnMethodInfo = observableType.GetMethod("Return");
var genericMethodInfo = returnMethodInfo.MakeGenericMethod(typeof(int));
The problem is that I'm getting an error message:
> Ambiguous match found.
I guess it's because there is another method called "Return":
public static IObservable<TResult> Return<TResult>(TResult value, IScheduler scheduler)
{
...
}
How should I call GetMethod to get a MethodInfo to the method I want?
答案1
得分: 2
你可以尝试使用这个解决方案。
var method = typeof(Observable).GetMethods().FirstOrDefault(
x => x.Name.Equals("Return", StringComparison.OrdinalIgnoreCase) &&
x.IsGenericMethod && x.GetParameters().Length == 1)
?.MakeGenericMethod(typeof(int));
英文:
You could try it with this solution.
var method = typeof(Observable).GetMethods().FirstOrDefault(
x => x.Name.Equals("Return", StringComparison.OrdinalIgnoreCase) &&
x.IsGenericMethod && x.GetParameters().Length == 1)
?.MakeGenericMethod(typeof(int));
答案2
得分: 1
你需要使用GetMethods()并筛选出你想要的方法；这可能会很简单，如下所示：
var returnMethodInfo = observableType.GetMethods().Single(x => x.Name == "Return"
&& x.IsGenericMethodDefinition && x.GetParameters().Length == 1);
英文:
You'll need to use GetMethods() and filter to the one you want; this could be as simple as:
var returnMethodInfo = observableType.GetMethods().Single(x => x.Name == "Return"
&& x.IsGenericMethodDefinition && x.GetParameters().Length == 1);
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