Cast the given collection to a collection of select list items. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:List

  1. HOME
  2. CSharp
  3. System.Collections.Generic
  4. List

Description

Cast the given collection to a collection of select list items.

Demo Code


using System.Web.Mvc;
using System.Linq;
using System.Collections.Generic;
using System;//w w w .  j a  v  a  2 s. co  m

public class Main{
        /// <summary>
        /// Cast the given collection to a collection of select list items.
        /// </summary>
        public static IEnumerable<SelectListItem> ToSelectList<T>(this IEnumerable<T> collection, Func<T, object> value, Func<T, object> text, object selectedValue)
        {
            return collection == null
                       ? new List<SelectListItem>()
                       : collection.Select(item => new SelectListItem { Value = value(item).ToString(), Text = text(item).ToString(), Selected = (value(item).Equals(selectedValue)) });
        }
        /// <summary>
        /// Cast the given collection to a collection of select list items.
        /// </summary>
        public static IEnumerable<SelectListItem> ToSelectList<T>(this IEnumerable<T> collection, Func<T, object> value, Func<T, object> text)
        {
            return collection == null
                       ? new List<SelectListItem>()
                       : collection.Select(item => new SelectListItem { Value = value(item).ToString(), Text = text(item).ToString() });
        }
        /// <summary>
        /// Cast the given collection to a collection of select list items.
        /// </summary>
        public static IEnumerable<SelectListItem> ToSelectList<T>(this IEnumerable<T> collection, Func<T, string> value, Func<T, string> text)
        {
            return collection == null 
                ? new List<SelectListItem>() 
                : collection.Select(item => new SelectListItem { Value = value(item), Text = text(item) });
        }
        public static SelectList ToSelectList<T>(this IEnumerable<T> collection, string dataValueField, string dataTextField)
        {
            collection.ThrowIfArgumentIsNull("collection");
            return new SelectList(collection, dataValueField, dataTextField);
        }
}

Related Tutorials