public enum ProductType
 {
    小产品=1,
    大产品，
    超大产品
}

/// <summary>
/// 枚举类型转化为DataTable
/// </summary>
public static DataTable EnumToDataTable(Type enumType, string key, string val)  
{  
           var names = Enum.GetNames(enumType);  
           var values = Enum.GetValues(enumType);  
   
           var table = new DataTable();  
           table.Columns.Add(key, Type.GetType("System.String"));  
           table.Columns.Add(val, Type.GetType("System.Int32"));  
           table.Columns[key].Unique = true;  
           for (int i = 0; i < values.Length; i++)  
           {  
               var dr = table.NewRow();  
               dr[key] = names[i];  
               dr[val] = (int)values.GetValue(i);  
               table.Rows.Add(dr);  
           }  
           return table;  
}  

 var dt = EnumToDataTable(typeof(ProductType), "key", "value");