Can not cast integer to Enum in Generic method [duplicate]

Question

I found c# does not allow generic type to be enum, so I did some research online and find this thread Anyone know a good workaround for the lack of an enum generic constraint?, then I installed the nuget package, but in my extension method, (T)x.ToInteger() throws can not convert type 'int' to 'T'. Thus GetDescription() won't work either, because it is my another enum extension method to get description of enum value. If I replace 'T' with a specified Enum, the following code will work. Any help is appreciated. Here is my extension methos:

public static string ToEnumDescription<T>(this string enumValue) 
    where T: struct, IEnumConstraint
{
    if (enumValue.IsNullOrEmpty()) return string.Empty;
    var list = enumValue.Split(',');
    var descriptionList = new List<String>();
    foreach (var x in list)
    {
        var description = (x.IsInteger() && Enum.IsDefined(typeof(T), x.ToInteger())) 
            ? ((T)x.ToInteger()).GetDescription() 
            : string.Empty;
        descriptionList.Add(description);
    }
    return descriptionList.ToCommaSeperatedNoQuote();
}

Eren Ersönmez · Accepted Answer · 2017-03-24 21:14:07Z

2

As a workaround, instead of (T)x.ToInteger() you should be able to do: (T)(object)x.ToInteger().

This involves boxing and unboxing the value but that most likely is not a significant performance issue here.

answered Mar 24, 2017 at 21:14

Eren Ersönmez

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1 Comment

Steven Zack Over a year ago

Wonderful, now I can convert int to T, but 'T' must be convert into System.Enum before I can use GetDescription() extension method.

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