Convert List<T> to List<myType>

Question

When calling any Convert function error apperars:

Argument 2: cannot convert from 'System.Collections.Generic.List<T>' to 'System.Collections.Generic.List<ProductionRecent>

Im trying to pass any list inside the function, determine which list it must be and converting it. Any Suggestions?

    public List<T> ConvertToList<T>(DataTable dt, List<T> list)
    {
        if (list.GetType() == typeof(List<ProductionPending>))
        {                
            ConvertToProductionPending(dt, list);   // ERROR
        }
        else if (list.GetType() == typeof(List<ProductionRecent>))
        {
            ConvertToProductionRecent(dt, list);   // ERROR
        }
        else if (list.GetType() == typeof(List<MirrorDeployments>))
        {
            ConvertToMirror(dt list);   // ERROR
        }
        return list;
    }

    private List<ProductionPending> ConvertToProductionPending(DataTable dt, List<ProductionPending> list)
    {
          // do some stuff here
          return list;
    }

    private List<ProductionRecent> ConvertToProductionRecent(DataTable dt, List<ProductionRecent> list)
    {
        // do some stuff here
        return list;
    }
    private List<MirrorDeployments> ConvertToMirror(DataTable dt, List<MirrorDeployments> list)
    {
        // do some stuff here
        return list;
    }

Answer 1

Try to cast before pass to your method:

public List<T> ConvertToList<T>(DataTable dt, List<T> list)
{
    if (list.GetType() == typeof(List<ProductionPending>))
    {                
        ConvertToProductionPending(dt, (list as List<ProductionPending>)); 
    }
    else if (list.GetType() == typeof(List<ProductionRecent>))
    {
        ConvertToProductionRecent(dt, (list as List<ProductionRecent>));   
    }
    else if (list.GetType() == typeof(List<MirrorDeployments>))
    {
        ConvertToMirror(dt, (list as List<MirrorDeployments>));
    }
    return list;
}

Edit:

Also, if you're just returning the list without doing anything, you don't need the convert method at all, just cast like List<MirrorDeployments> l2 = (list as List<MirrorDeployments>)

If you're using C# 7, you could also use pattern matching :

public List<T> ConvertToList<T>(DataTable dt, List<T> list)
{
    switch(list)
    {
        case List<ProductionPending> pp:
            //pp is list cast as List<ProductionPending>
            break;
        case List<ProductionRecent> pr:
            //pr is list cast as List<ProductionRecent>
            break;
        case List<MirrorDeployments> md:
            //md is list cast as List<MirrorDeployments>
            break;          
    }
    return list;
}