public static bool InEnumerable(object arg, IEnumerable set)
{
Require.NotNull(set, "set");
var dictionary = set as IDictionary;
if (dictionary != null)
{
return(dictionary.Contains(arg));
}
Type argType = null;
if (arg != null)
{
argType = arg.GetType();
}
foreach (var item in set)
{
if (arg == null)
{
if (item == null)
{
return(true);
}
}
else if (item != null)
{
var targetType = item.GetType();
if (argType != targetType)
{
if (TypeUtil.CanCastImplicitely(argType, targetType, false))
{
if (Equals(TypeUtil.CastImplicitely(arg, targetType), item))
{
return(true);
}
}
else if (TypeUtil.CanCastImplicitely(targetType, argType, false))
{
if (Equals(arg, TypeUtil.CastImplicitely(item, argType)))
{
return(true);
}
}
}
else
{
if (Equals(arg, item))
{
return(true);
}
}
}
}
return(false);
}
