[英]C# reflection, get overloaded method
I've already checked a few other posts regarding reflection and overloaded methods but could find any help. 我已经检查了一些关于反射和重载方法的其他帖子,但可以找到任何帮助。 One post I found was this one , but that didn't help a lot. 我发现的一个帖子就是这个帖子,但这并没有多大帮助。
I have the following two methods: 我有以下两种方法:
1 | public void Delete<T>(T obj) where T : class { ... }
2 | public void Delete<T>(ICollection<T> obj) where T : class { ... }
I'm trying to get method N°1. 我正试图获得方法N°1。
I tried the classic GetMethod("Delete")
approach, but since there are two methods with this name a Ambiguous
-Exception was thrown. 我尝试了经典的GetMethod("Delete")
方法,但由于这个名称有两个方法,因此引发了一个Ambiguous
-Exception。 I tried specifying the method schema with an additional parameter like GetMethod("Delete", new [] { typeof(Object) })
which didn't find anything (null returned). 我尝试使用其他参数来指定方法模式,例如GetMethod("Delete", new [] { typeof(Object) })
,它没有找到任何内容(null返回)。
I figgured I might as well just loop through all methods and check for the parameters. 我想我也可以循环遍历所有方法并检查参数。
I wrote the following method... 我写了以下方法......
public static IEnumerable<MethodInfo> GetMethods(this Type type, String name, Type schemaExclude)
{
IEnumerable<MethodInfo> m = type.GetRuntimeMethods().Where(x => x.Name.Equals(name));
return (from r in m let p = r.GetParameters() where !p.Any(o => schemaExclude.IsAssignableFrom(o.ParameterType)) select r).ToList();
}
... which returns the methods which do not contain a parameter with type schemaExclude
. ...返回不包含类型为schemaExclude
的参数的方法。
I called it like this GetMethods("Delete", typeof(ICollection))
which didn't work as expected. 我称之为GetMethods("Delete", typeof(ICollection))
,它没有按预期工作。
Apparently ..ICollection'1[T]
is not assignable to ICollection
. 显然..ICollection'1[T]
不能分配给ICollection
。 Neither is it to IEnumerable
, IEnumerable<>
and ICollection<>
. 也不是IEnumerable
, IEnumerable<>
和ICollection<>
。 I, again, tried it with typeof(Object)
which did work but did return both methods (like its supposed to). 我再次尝试使用typeof(Object)
,它确实有效,但确实返回了两种方法(就像它应该的那样)。
What exactly am I missing? 我到底错过了什么?
You can look up the method by checking its generic parameter type, like this: 您可以通过检查其泛型参数类型来查找该方法,如下所示:
return type
.GetRuntimeMethods()
.Where(x => x.Name.Equals("Delete"))
.Select(m => new {
Method = m
, Parameters = m.GetParameters()
})
.FirstOrDefault(p =>
p.Parameters.Length == 1
&& p.Parameters[0].ParameterType.IsGenericType
&& p.Parameters[0].ParameterType.GetGenericTypeDefinition() == typeof(ICollection<>)
)?.Method;
The above filters methods that match the criteria below: 以上筛选符合以下条件的方法:
ICollection<>
使用从ICollection<>
构造的泛型参数类型
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