ASP.NET MVC Extensions Methods

These are my extensions.

  1. Not display dropdownlist if the Select list is null
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    public static MvcHtmlString DropDownListNull(this HtmlHelper html, string Name, SelectList select, object htmlAttributes)
    {
     
    if (select == null)
    return MvcHtmlString.Empty;
    else
     return html.DropDownList(Name, select, htmlAttributes);
     
    }
  2. Transform Enum to SelectList
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    #region enum to list
            private static List<KeyValuePair<long, string>> FromEnum(this Type e)
            {
                List<KeyValuePair<long, string>> kvp = new List<KeyValuePair<long, string>>();
                foreach (var s in Enum.GetValues(e))
                {
                    kvp.Add(new KeyValuePair<long, string>((int)s, s.ToString()));
                }
                return kvp;
            }
            public static SelectList ToSelectList(this Type enumObj)
            {
     
                return new SelectList(enumObj.FromEnum(), "Key", "Value");
     
            }
            #endregion
  3. Transform Generic list into a SelectList
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          #region Generic List to SelectItem
    public static SelectList SelectFromList<TItem>(this List<TItem> values,
        Expression<Func<TItem, string>> key, Expression<Func<TItem, string>> value)
    {
        var Key = key.Compile();
        var Value = value.Compile();
        List<KeyValuePair<string, string>> kvp = new List<KeyValuePair<string, string>>(values.Count);
        values.ForEach(item =>
            kvp.Add(new KeyValuePair<string, string>(Key.Invoke(item), Value.Invoke(item))));
     
        return new SelectList(kvp, "Key", "Value");
     
    }
    #endregion
  4. Display pager control
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    #region paged list control
            //after http://geekswithblogs.net/nuri/archive/2009/08/05/mvc-paged-list.aspx
            /// <summary>
            /// Shows a pager control - Creates a list of links that jump to each page
            /// </summary>
            /// <param name="page">The ViewPage instance this method executes on.</param>
            /// <param name="pagedList">A PagedList instance containing the data for the paged control</param>
            /// <param name="controllerName">Name of the controller.</param>
            /// <param name="actionName">Name of the action on the controller.</param>
            public static void ShowPagerControl(this ViewPage page, BasePagedListImplementation pagedList, string formatUrl)
            {
                HtmlTextWriter writer = new HtmlTextWriter(page.Response.Output);
                if (writer != null)
                {
                    for (int pageNum = 1; pageNum <= pagedList.PageCount; pageNum++)
                    {
                        bool samepage=(pageNum == pagedList.PageNumber);
                        if (!samepage)
                        {
                            writer.AddAttribute(HtmlTextWriterAttribute.Href,string.Format(formatUrl, pageNum));
                            writer.AddAttribute(HtmlTextWriterAttribute.Alt, "Page " + pageNum);
                            writer.RenderBeginTag(HtmlTextWriterTag.A);
                        }
     
                        writer.AddAttribute(HtmlTextWriterAttribute.Class,
                                            pageNum == pagedList.PageNumber ?
                                                                "pageLinkCurrent" :
                                                                "pageLink");
     
                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                        writer.Write(pageNum);
                        writer.RenderEndTag();
     
                        if (!samepage)
                        {
                            writer.RenderEndTag();
                        }
                        writer.Write("&nbsp;");
                    }
     
                    writer.Write("(");
                    writer.Write(pagedList.TotalItemCount);
                    writer.Write(" items in all)");
                }
            }
     
            #endregion

Other extensions available that are good :

  1. http://blog.wekeroad.com/blog/asp-net-mvc-list-helper-extension-method/
  2. http://www.hanselman.com/blog/ASPNETMVCSessionAtMix08TDDAndMvcMockHelpers.aspx
  3. http://helios.ca/2009/09/21/asp-net-mvc-extension-methods-of-urlhelper/
  4. http://blog.donnfelker.com/2010/02/25/asp-net-mvc-tempdata-extension-methods/
  5. http://inq.me/post/ASPNet-MVC-Extension-method-to-create-a-Security-Aware-HtmlActionLink.aspx

If you know more, please tell me