mawazejaz/EnumHelper

If you have a list of enum and you want to populate that in form of the dropdown or selected list this file really helps you. This file has a Generic method to convert the enum into the Selected list.

Enum as Dropdown list

In Most of the cases we have scenario in the development to papulate values of an enum into a SelectList or dropdown. If you have a list of enum and you want to papulate that in form of the dropdown or selected list this file really help you. This file have Generic method to convert enum into Selected list.

Installation

1-Copy Compelete file of code from blow and past this into your project. 2-Copy file in the folder Helper -> EnumHelper this file have the readymade code to start.

ToSelectList()

Convert Enum to Selected List

    public static SelectList ToSelectList<TEnum>()
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = Enum.GetName(typeof(TEnum), x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text");
        }

#'TEnum'
Name Enum name you want to get in the form of a Selected list 

ToSelectList(TEnum selectedValue)

This method will Convert Enum to Selected list with Selected Value

  public static SelectList ToSelectList<TEnum>(TEnum selectedValue)
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = Enum.GetName(typeof(TEnum), x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text", selectedValue);
        }

#'TEnum'
Name Enum name you want to get in the form of a Selected list

ToSelectListDisplayName()

Some Time we want to show different text for enum in this case we have to define the decorator [Display(Name= "Rejected")]

        public static SelectList ToSelectListDisplayName<TEnum>()
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = GetDisplayName(x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text");
        }

#'TEnum'
Name Enum name you want to get in the form of a Selected list 
#GetDisplayName(x)
Method Definition Available blow for further help 

ToSelectListDisplayName()

Some Time we want to show different text for enum in this case we have to define the decorator [Display(Name= "Rejected")] This method will show enum in the selected list with Display Name as Text

     public static SelectList ToSelectListDisplayName<TEnum>(TEnum selectedValue)
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = GetDisplayName(x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text", selectedValue);
        }

Name Enum name you want to get in the form of a Selected list 
#GetDisplayName(x)
Method Definition Available blow for further help 

GetDisplayName(Enum enumValue)

This Method will get the name of the enum from decorater this will return the original enum in case decorater not defined for some enums

  public static string GetDisplayName(Enum enumValue)
        {
            string displayName;
            displayName = enumValue.GetType()
                .GetMember(enumValue.ToString())
                .FirstOrDefault()
                .GetCustomAttribute<DisplayAttribute>()?
                .GetName();
            if (String.IsNullOrEmpty(displayName))
            {
                displayName = enumValue.ToString();
            }
            return displayName;
        }

Name Enum name you want to get in the form of a Selected list 
#GetDisplayName(x)
Method Definition Available blow for further help 

How to Use this

Examples

ViewBag.Status = EnumSelectedListMethods.ToSelectListDisplayName<enumStatus();

**In Razor Page **

<div class="row">
    <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
        <label>Status</label>
        <div class="form-group selecter-feild">
            <select asp-items=" ViewBag.Status" class="form-control"></select>
        </div>
    </div>
</div>

Compelete file of code

   public static class EnumSelectedListMethods
    {
        //to selcted List
        public static SelectList ToSelectList<TEnum>()
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = Enum.GetName(typeof(TEnum), x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text");
        }
        //with Selected Value
        public static SelectList ToSelectList<TEnum>(TEnum selectedValue)
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = Enum.GetName(typeof(TEnum), x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text", selectedValue);
        }

        //to selcted List with dispaly Name
        public static SelectList ToSelectListDisplayName<TEnum>()
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = GetDisplayName(x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text");
        }
        //to Selected list with Selected Value and Display Name
        public static SelectList ToSelectListDisplayName<TEnum>(TEnum selectedValue)
        {
            return new SelectList(Enum.GetValues(typeof(TEnum))
            .OfType<Enum>()
            .Select(x => new SelectListItem
            {
                Text = GetDisplayName(x),
                Value = (Convert.ToInt32(x))
                .ToString()
            }), "Value", "Text", selectedValue);
        }

        //Display Name of the enum
        public static string GetDisplayName(Enum enumValue)
        {
            string displayName;
            displayName = enumValue.GetType()
                .GetMember(enumValue.ToString())
                .FirstOrDefault()
                .GetCustomAttribute<DisplayAttribute>()?
                .GetName();
            if (String.IsNullOrEmpty(displayName))
            {
                displayName = enumValue.ToString();
            }
            return displayName;
        }


    }

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