Thursday, October 3, 2013

C# Get generic non-array type from generic array type

Given the following function;

void SomeFunction<T>(...){    SomeOtherFunction<T>();}

This works fine, yet sometimes the function fails before T passed is an array type, yet it mustn’t be an array type. These functions have to do with JSON deserialization of a dictionary, yet for some reason it doesn’t accept the T array argument when the dictionary has only one entry.

In short, I want to do this

void SomeFunction<T>(...){    try {    SomeOtherFunction<T>();    } catch ( Exception e ){        SomeOtherFunction<T arrayless>();    }}

I’ve tried a ton of stuff, & I realize the real problem is somewhere else, yet I need to temporary fix this so I can work on a real solution in the deserializer. I tried reflection too using the following method;

MethodInfo method = typeof(JToken).GetMethod("ToObject", System.Type.EmptyTypes);MethodInfo generic = method.MakeGenericMethod(typeof(T).GetElementType().GetGenericTypeDefinition());object result = generic.Invoke(valueToken, null);

But that doesn’t quite work either.

Thank you!

I am not really sure what you are trying to achieve here, yet to obtain the type of the elements in an array, you have to use Type.GetElementType():

void SomeFunction<T>(){    var type = typeof(T);    if(type.IsArray)    {        var elementType = type.GetElementType();        var method = typeof(Foo).GetMethod("SomeOtherFunction")                                .MakeGenericMethod(elementType);        // invoke method    }    else        foo.SomeOtherFunction<T>(...);}

No comments:

Post a Comment