I've already checked a few other posts regarding reflection and overloaded methods but could find any help. One post I found was this one, but that didn't help a lot.
I have the following two methods:
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.
I tried the classic GetMethod("Delete")
approach, but since there are two methods with this name a Ambiguous
-Exception was thrown. I tried specifying the method schema with an additional parameter like GetMethod("Delete", new [] { typeof(Object) })
which didn't find anything (null returned).
I figgured I might as well just loop through all methods and check for the parameters.
I wrote the following method...
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
.
I called it like this
GetMethods("Delete", typeof(ICollection))
which didn't work as expected.
Apparently ..ICollection'1[T]
is not assignable to ICollection
. Neither is it to IEnumerable
, IEnumerable<>
and ICollection<>
. I, again, tried it with typeof(Object)
which did work but did return both methods (like its supposed to).
What exactly am I missing?
You can look up the method by checking its generic parameter type, like this:
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:
ICollection<>
Demo.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With