CODEWITHSUNDEEP
c#
Alex
Alex

Reputation: 97

Create List<T> by Type

I have a problem by casting a generic list. I get the value of a generic list and want to use it as a parameter for the SomeMehtod.

List<MyClass> GenericList;
var propList= this.GetType().GetProperty("GenericList").GetValue(this);

SomeMethode(propList) <-- Does not work
private void SomeMethode(List<T> genericList)
{
}

Can anybody give me a hint? I have tried this but it won't work:

List<typeof(MyClass)> newPropList = propList;

My Problem is that MyClass is stored in type variable:

var typesWithMyAttribute =
    from a in AppDomain.CurrentDomain.GetAssemblies()
    from t in a.GetTypes()
    let attributes = t.GetCustomAttributes(typeof(XMLDataAttribute), true)
    where attributes != null && attributes.Length > 0
    select new { Type = t, Attributes = attributes.Cast<XMLDataAttribute>() };

foreach (var a in typesWithMyAttribute)
{
    var propList = this.GetType().GetProperty(a.Type.Name + "List").GetValue(this);
    SomeMethode<a.Type>(propList); <-- Won't work
}

Upvotes: 0

Views: 137

Answers (2)

Ren&#233; Vogt
Ren&#233; Vogt

Reputation: 43936

You need to use reflection to get a MethodInfo for the constructed method SomeMethod.

MethodInfo genericMethod = this.GetType().GetMethod("SomeMethode", BindingFlags.NonPublic);
foreach (var a in typesWithMyAttribute)
{
    MethodInfo constructedMethod = genericMethod.MakeGenericMethod(a.Type);
    var propList = this.GetType().GetProperty(a.Type.Name + "List").GetValue(this);
    constructedMethod.Invoke(this, new[]{propList});
}

For GetMethod you may need to specify more BindingFlags if your SomeMethode is static and/or private.

MakeGenericMethod creates a MethodInfo appyling the type arguments to the generic MethodInfo.

Then you Invoke that method passing your propList as argument.

Note that you have to declare SomeMethode as generic, too:

private void SomeMethode<T>(List<T> genericList)
{
}

Upvotes: 2

ThePerplexedOne
ThePerplexedOne

Reputation: 2950

Your method must be generic, as well.

private void SomeMethode<T>(List<T> genericList)
{
}

That's all I can help you with at the moment, since I have no idea what you're trying to achieve.

Upvotes: 0

Related Questions