Skip to main content

How to get collections on viewmodel on postback in MVC

In mvc most of the people will face problem how to bind view model list while post request. If a partial control is binding with a list and want to preserve the user input with view model list, most common issue is id/name is same. If the Id/Name are different only MVC engine can bind it with the model.

Please see the below example

Build the view/partial view in the following way. By keeping a row counter means all items will have unique names.

Suppose this partial view is coming inside a View Called MethodName.ASPX and is included inside the

Main Page


using html.beginform()
[httpGet]

{
<%html.dropdownlist(model=>model.Test, new {onclick=Test(<%=model.Id%>);});
<.div id="dvPopulatePartialViewWithList"></.div>
}


Javascript function Test


function Test(id)
{
 $.ajax({
        type: "Get",
        data: "Id=" + Id,
        url: '/MyController/GetPartialViewListById',
        success: function (result) {
            $('#dvPopulatePartialViewWithList').html(result);
        }
    });
}


Controller Method


public actionresult GetPartialViewListById(int Id)
{
 try
{
  List list=GetListById(Id);

return renderPartial("MyPartialView",list);
}
catch(Exception ex)
{
throw new exception("error",ex);
}
}

PartialView   MyPartialView


<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl>" %>
<%@ Import Namespace="External_ViewModel" %>

<%  int rowCounter = 0; //Keep track of unique value for binding to model list
%>
   

<%
           foreach (var model in Model)
           {
           
<%: Html.ValidationSummary(true)%>
<%: Html.Hidden("[" + rowCounter + "].Id", model.Id)%>
<%: Html.Hidden("[" + rowCounter + "].Name", Model.Name)%>

    <%= model.nameOfItem%>
    [
    <%= cav.Item%>
    ]



    <%: Html.TextBox("[" + rowCounter + "].Value", model.Value, new { Style = "width:140px;" })%>
 
    <%: Html.ValidationMessage("[" + rowCounter + "].Value", model.Value)%>
 
<% ++rowCounter;
           }  //end foreach  Loop
%>

In Controller create the action like this


[httpPost]
 public ActionResult MethodName(ViewModel model, List resultList)

        {
// when you submit the form resultList will have binded values
}

Comments

Popular posts from this blog

Compiled Query- Improve the performance of Linq to Entity Query

Most of the small or medium IT firms are using the Entity framework for the Data Access layer (DAL). If we write a complex linq to Entity queries performance will always be an issue. But with the Compiled Query Performance can be improved. This below definitions are from MSDN and more details can be found on the MSDN Link that is at the end of this post           When you have an application that executes structurally similar queries many times in the Entity Framework, you can frequently increase performance by compiling the query one time and executing it several times with different parameters. For example, an application might have to retrieve all the QuoteRevision for a particular quotelineStatus, the quotelinestatus is specified at runtime. LINQ to Entities supports using compiled queries for this purpose.               The  compiled query class provides compilation and caching of queries for reuse . Co...

Sql Server Internals - Named Pipes

Named pipes enables clients applications to request a reliable and two way connection between the client application and Sql Server, across a network. A named pipe has a name which follows the UNC naming convention : \\Server\pipe\name The default names pipe for SQL server is :                 \\Server\pipe\sql\query A named instance would have a named pipe of                \\server\pipe\MSSQL$instancename\sql\query Early versions of SQL Server only provided Named Pipes. Named Pipes also allows for impersonation of a clients credentials. The feature is used by SQL server when using Linked Servers. The clients logon credentials are passed across to the Linked Server for authentication. Named Pipes can operate over TCP/IP, NETBEUI or IPX as it indirectly relies on the Common Internet Files Sytems

SRT THE REAL HERO

Lets Start with something quite interesting. So I am selecting SRT ( As an Indian too much dedicated towards cricket). For me cricket means Sachin . When ever Sachin is in crease i never looks the score. Like to see Sachin plays at least 35 to 40 overs. Usually by that time he will reach his century. My passion is to study the statistics of Sachin. You know Sachin looks almost 72 games to hit his first century. After 17 years now ( more than 350 matches he played after) he had 46 ODI century, what an amazing batsman. Till 1992 -1993 if you looks his ODI average its in late twenties. But now its after that 350 matches now more than 45 . I know one thing Sachin will play till his wish. I like to see him score more than 100 odi century( Sachin personally enjoys this). Its not a barrier , but a guy got that much passion towards game can achieve it. I always ideals Sachin. While i am working and have difficult situations, I always think how Sachin played 137 against Australia ( dessert ...