ASP.NET MVC Controller Lifecycle

ASP.NET MVC Controller will be executed in the following  order:

Every controller action call go through the certain events events. Some of the methods I have listed below.

1) Initialize
Executed at the beginning of action call.

protected override void Initialize(RequestContext requestContext)
{
}

2) On Authorization
Executed at the time of authorizing the action call

protected override void OnAuthorization(AuthorizationContext filterContext)
{
}

1) On Action Executing
Executed at the time of executing the action just after authorization.

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
}

jQuery Datatables server-side pagination in ASP.NET MVC with Entity Framework

In order to capture datatable events we need to create a class as follows;

   /// <summary>  
   /// Class that encapsulates most common parameters sent by DataTables plugin  
   /// </summary>  
   public class jQueryDataTableParams  
   {  
     /// <summary>  
     /// Request sequence number sent by DataTable,  
     /// same value must be returned in response  
     /// </summary>      
     public string sEcho { get; set; }  
     /// <summary>  
     /// Text used for filtering  
     /// </summary>  
     public string sSearch { get; set; }  
     /// <summary>  
     /// Number of records that should be shown in table  
     /// </summary>  
     public int iDisplayLength { get; set; }  
     /// <summary>  
     /// First record that should be shown(used for paging)  
     /// </summary>  
     public int iDisplayStart { get; set; }  
     /// <summary>  
     /// Number of columns in table  
     /// </summary>  
     public int iColumns { get; set; }  
     /// <summary>  
     /// Number of columns that are used in sorting  
     /// </summary>  
     public int iSortingCols { get; set; }  
     /// <summary>  
     /// Comma separated list of column names  
     /// </summary>  
     public string sColumns { get; set; }  

Following is the method to load data for datatable. Assuming that we are going to show firstname, lastname, company and jobtitle from member table.

 public ActionResult GetDataForDatatable(jQueryDataTableParams param)  
 {  
    IQueryable<Member> memberCol = myDbContext.Member  
                      .Select(m => m.FirstName,  
                          m.LastName,  
                          m.Company,  
                          m.JobTitle)  
                      .AsQueryable();  
    int totalCount = memberCol.Count();  
    IEnumerable<Member> filteredMembers = memberCol;  
    if (!string.IsNullOrEmpty(param.sSearch))  
    {  
      filteredMembers = memberCol  
              .Where(m => m.FirstName.Contains(param.sSearch) ||  
                 m.LastName.Contains(param.sSearch) ||  
                 m.Company.Contains(param.sSearch) ||  
                 m.JobTitle.Contains(param.sSearch));  
    }  
    var sortIdx = Convert.ToInt32(Request["iSortCol_0"]);  
    Func<Member,string> orderingFunction = (m => sortIdx == 0 ? m.FirstName :  
                         sortIdx == 1 ? m.LastName :  
                         sortIdx == 2 ? m.Company :  
                         m.JobTitle);  
    var sortDirection = Request["sSortDir_0"]; // asc or desc  
    if (sortDirection == "asc")  
      filteredMembers = filteredMembers.OrderBy(orderingFunction);  
    else  
      filteredMembers = filteredMembers.OrderByDescending(orderingFunction);  
    var displayedMembers = filteredMembers  
             .Skip(param.iDisplayStart)  
             .Take(param.iDisplayLength);  
    var result = from a in displayedMembers  
           select new[] { a.FirstName, a.LastName, a.Company,   
                  a.JobTitle, a.ID.ToString() };  
    return Json(new  
       {  
         sEcho = param.sEcho,  
         iTotalRecords = totalCount,  
         iTotalDisplayRecords = filteredMembers.Count(),  
         aaData = result  
       },  
       JsonRequestBehavior.AllowGet);  
 }  

Following is how we initialize our datatable and design the HTML.

-> Reference to jQuery js, jQuery Datatable js, jQuery Datatable css

 <table id="tblMember" class="table" style="width: 100%">  
   <thead>  
     <tr>  
       <th>First Name</th>  
       <th>Last Name</th>  
       <th>Company</th>  
       <th>Job Title</th>  
       <th>Actions</th>  
     </tr>  
   </thead>  
   <tbody>  
   </tbody>  
 </table>  
 <script>  
   $(document).ready(function () {  
     // destroy existing datatable before, initiating  
     if (oTable != undefined) {  
       oTable.fnDestroy();  
     };  
     oTable = $('#tblMember').dataTable({  
       "bServerSide": true,  
       "sAjaxSource": '@Url.Action("GetDataForDatatable","Member")',  
       "bProcessing": true,  
       "aoColumns": [  
               { "sName": "FirstName" },  
               { "sName": "LastName" },  
               { "sName": "Company" },  
               { "sName": "JobTitle" },  
               {  
                 "sName": "ID",  
                 "bSearchable": false,  
                 "bSortable": false,  
                 'mRender': function (data, type, row) {  
                   return '<a href="@Url.Action("Edit", "Member")/' + row[4] + '" class="btn btn-warning btn-xs" role="button">@labels.btn_edit</a>' + '&nbsp;' +  
                       '<button onclick="confirmDelete(' + row[4] + ');" class="btn btn-danger btn-xs">@labels.btn_delete</button>';  
                 }  
               },  
       ]  
     });  
   }  
 </script>