private static CommandBindingDescriptor FindDescriptor(IVerb verb, Type targetType)
{
if (verb == null)
{
verb = NullVerb.Instance;
}
var verbType = verb.GetType();
if (!commandBindings.ContainsKey(verbType))
{
return(null);
}
var list = commandBindings[verbType];
CommandBindingDescriptor result = null;
if (targetType != null)
{
result = list.FirstOrDefault(b => b.TargetType != null && b.TargetType == targetType); // exact matching
if (result != null)
{
return(result);
}
result = list.FirstOrDefault(b => b.TargetType != null && b.TargetType.IsA(targetType)); // inheritance matching
if (result != null)
{
return(result);
}
}
return(list.FirstOrDefault(b => b.TargetType == null)); // non-typed commands
}
