GET Request in .NET Core 6 with multiple parameters in a query - using bitwise

Question

I'm trying to make it so I can send queries like: But I am having trouble using the bitwise functions to do so. The var orders is wrong because TypeEnum can't be used with IEnumerable

Answer 1

I think you're doing more work than necessary. Enum.TryParse is able to take a comma separated list of names and parse it into the correct value:

public static void Get(string orderTypes)
{
    var orders = Enumerable.Empty<OrderList>();
    if (Enum.TryParse(typeof(TypeEnum), orderTypes, out var enumOrderTypes))
    {
        orders = _context.OrderLists.Where(o => (o.orderType & enumOrderTypes) > 0);
    }
    return Ok(orders);
}

However, this assumes that orderTypes only contains valid enum value names. So if orderTypes was "Standard,IDontExist" Enum.TryParse would return false.

---

If you want to allow invalid names and just filter them out, you can do it like so:

public static void Get(string orderTypes)
{
    var typeList = orderTypes.Split(',',
        StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);

    // I'd recommend adding 'None = 0' as a default value for the enum
    TypeEnum enumOrderTypes = TypeEnum.None;
    foreach (var strType in typeList)
    {
        if (Enum.TryParse(typeof(TypeEnum), strType, out var enumType))
        {
            enumOrderTypes |= (TypeEnum)enumType;
        }
    }
    
    var orders = _context.OrderLists.Where(o => (o.orderType & enumOrderTypes) > 0);
    
    return Ok(orders);
}

In this example if orderTypes was "Standard,IDontExist", then enumOrderTypes would end up just containing Standard.

Check out this fiddle for a demonstration.