I am new with C# and I have some troubles with enum.
I have Enum defined like this:
public enum CustomFields
{
[Display(Name = "first_name")]
FirstName = 1,
[Display(Name = "last_name")]
LastName = 2,
}
What I need is code which will check does display name exist and if so return enum value.
So if I have display name:
var name = "first_name";
I need something like:
var name = "first_name";
CustomFields.getEnumValue(name);
This should return:
CustomFields.FirstName;
You could use generics:
public class Program
{
private static void Main(string[] args)
{
var name = "first_name";
CustomFields customFields = name.GetValueFromName<CustomFields>();
}
}
public enum CustomFields
{
[Display(Name = "first_name")]
FirstName = 1,
[Display(Name = "last_name")]
LastName = 2,
}
public static T GetValueFromName<T>(this string name) where T : Enum
{
var type = typeof(T);
foreach (var field in type.GetFields())
{
if (Attribute.GetCustomAttribute(field, typeof(DisplayAttribute)) is DisplayAttribute attribute)
{
if (attribute.Name == name)
{
return (T)field.GetValue(null);
}
}
if (field.Name == name)
{
return (T)field.GetValue(null);
}
}
throw new ArgumentOutOfRangeException(nameof(name));
}
Try the following.
void Main()
{
CustomFields value1 = GetEnumValue("first_name");
CustomFields value2 = GetEnumValue("last_name");
}
static Dictionary<string, CustomFields> displayNameMapping;
static CustomFields GetEnumValue(String displayName){
if (displayNameMapping == null){
var enumType = typeof(CustomFields);
var displayAttributeType = typeof(DisplayAttribute);
CustomFields? found = null;
displayNameMapping = new Dictionary<string, CustomFields>();
Enum.GetNames(enumType).ToList().ForEach(name=>{
var member = enumType.GetMember(name).First();
var displayAttrib = (DisplayAttribute)member.GetCustomAttributes(displayAttributeType, false).First();
displayNameMapping.Add(displayAttrib.Name, (CustomFields)Enum.Parse(enumType, name));
});
}
return displayNameMapping[displayName];
}
// Define other methods and classes here
public enum CustomFields
{
[Display(Name = "first_name")]
FirstName = 1,
[Display(Name = "last_name")]
LastName = 2,
}
