C# Enum for datatypes

There is the TypeCode Enumeration in System. Looks like it covers all of the base types.

You can get the TypeCode for any object using Type.GetTypeCode():

TypeCode typeCode = Type.GetTypeCode(anObject.GetType());

Do you simply want to associate an enum value with a string? You might want to use the Description attribute.

public enum MyEnum
{
    [Description("My first value.")]
    FirstValue,
    [Description("My second value.")]
    SecondValue,
    [Description("My third value.")]
    ThirdValue
}

private string GetEnumDescription(Enum value)
{
    FieldInfo fi = value.GetType().GetField(value.ToString());
    DescriptionAttribute[] attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
    if (attributes.Length > 0)
    {
        return attributes[0].Description;
    }
    else
    {
        return value.ToString();
    }
}

Another possibility for defining a mapping would be to use a Dictionary<int, string>.

There is a boolean property of Type-type "IsPrimitive" hope this helps you.

Based on your edit sounds like you need generics but I still question why a property would acceptably be an int or a string. Those are really very different things which can only lead to upcasting.

There is nothing like that in the BCL.

Why do you need it?

Why do you need that? The property is already a "filter" to what kind of data it can accept.

Have a look at :

Overloading properties in C#