About Typed parameters

[ika2]

Hi everybody, I have this abstract method:

public static T DecodeData<T>(byte[] data, string encRules)

But the type T must be defined during runtime. I mean... I have other method like: GetDownloadType(id); Depend on the id, I should pass one or another parameter to DecodeData. But I dont know how.

    public static Type GetDownloadType (int id)
    {
	    switch (id)
        {
	        case DOWNDIRECT: return typeof(DownDirect);
	        case DOWNOTHER: return typeof(DownOther);
	        case DOWNHEHE: return typeof(DownHehe);
	        default: return null;
	    }
    }

But when I try to use the Type result of this method to pass it to DecodeData... I cant. How should I do this? Thanks in advanced

[DaveyM69]

T needs to be resolvable at compile time i.e before runtime when you have access to the type via typeof

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)

[Lost User]

The type things used in generics are not instances of Type But of course you could put the calls to DecodeData in that switch (and some code that uses its result too, perhaps, otherwise you may get a similar problem with the result type)

[DaveyM69]

If you really need to invoke a generic method you could use something like this:

public static class Test
{
public static T GenericDecodeData<T>(byte[] data, string encRules)
{
// ...
return default(T);
}

public static Type GetDownloadType(int id)
{
    switch (id)
    {
        case DOWNDIRECT: return typeof(DownDirect);
        case DOWNOTHER: return typeof(DownOther);
        case DOWNHEHE: return typeof(DownHehe);
        default: return null;
    }
}
public static object DecodeData(Type type, byte\[\] data, string encRules)
{
    MethodInfo methodInfo = typeof(Test).GetMethod("GenericDecodeData").MakeGenericMethod(
        new Type\[\] { type });
    return methodInfo.Invoke(null, new object\[\] { data, encRules });
}

}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)

[ika2]

Thanks both. I think that your solution, Dave, could do the trick!!! Thankssss!! Kind regards