Problem with treeView MVC extention

Question

I'm working with a treeView data Binding in MVC, and I'm getting the following error:

Error 1 Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type

When I try to run the demo code:

 <% Html.Telerik().TreeView()


 .Name("TeleTreeView")
    .BindTo(Model, mappings => 
    {
         mappings.For<Category>(binding => binding
        .ItemDataBound((item, category) =>
        {
            item.Text = category.CategoryName;
        })
        .Children(category => category.Products));
         mappings.For<Product>(binding => binding
        .ItemDataBound((item, product) =>
        {
            item.Text = product.ProductName;
       }));
})
   .Render(); %>

I've read that maybe I'm missing an assembly so I've added the Linq one:

<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

Still having the same problem, any suggestions?

Lisa · Accepted Answer · 2011-04-21 01:06:45Z

1

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<Category>>"

This is the answer, What's passing through System.Web.Mvc.ViewPage. Should be the class we're mapping.

answered Apr 21, 2011 at 1:06

Lisa

3,18116 gold badges57 silver badges88 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Julien Lebosquain · Accepted Answer · 2011-07-24 11:09:47Z

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<GridWithWindow.Jar>>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    AddEditUser
</asp:Content>

    <% using (Html.BeginForm("AddEditUser", "JarUser", FormMethod.Post ))
       {%>

        <% List<TreeViewItem> checkedNodes = ViewData["TreeView1_checkedNodes"] as
            List<TreeViewItem>; %>


    <%= Html.Telerik().TreeView()
    .Name("Tree")
    .ShowCheckBox(true)
    )
    .BindTo(Model, mappings =>
    {
        mappings.For<GridWithWindow.Jar>(binding => binding
            .ItemDataBound((item, jag) =>
                {
                    item.Text = jag.TreeName;
                    item.Value = jag.TreeName;

                    if (checkedNodes != null)
                    {
                        var checkedNode = checkedNodes
                                            .Where(e => e.Value.Equals("ddd"))
                                            .FirstOrDefault();
                        item.Checked = checkedNode != null ? checkedNode.Checked : false;
                    }
                    item.Expanded = true;

                })
                .Children(jag => jag.FirstLevelIList));
        mappings.For<GridWithWindow.Jar.FirstLevel>(binding => binding
            .ItemDataBound((item, frst) =>
                {
                    item.Text = frst.FirstLevelName;
                    item.Value = frst.FirstLevelName;
                })
                .Children(frst => frst.SecondLevelList));
        mappings.For<GridWithWindow.Jar.FirstLevel.SecondLevel>(binding => binding
            .ItemDataBound((item, scnd) =>
            {
                item.Text = scnd.SecondLevelName;
                item.Value = scnd.SecondLevelName;
            })
             .Children(scnd => scnd.ThirdlevelList));
        mappings.For<GridWithWindow.Jar.FirstLevel.SecondLevel.Thirdlevel>(binding => binding
            .ItemDataBound((item, thrd) =>
            {
                item.Text = thrd.ThirdlevelName;
                item.Value = thrd.ThirdlevelName;
            })
             .Children(thrd => thrd.AEDV_List));
        mappings.For<GridWithWindow.UserAcces>(binding => binding
            .ItemDataBound((item, acs) =>
            {
                item.Text = acs.UserAccesName;
                item.Value = acs.UserAccesName;
            })
           );
    })%>
    <input type="submit" value="GO" id="btn" />
    <input type="button" id="pst" value="do post back" onclick="javascript:__doPostBack()" />
    <%} %>

    <style type="text/css">
        .event-log-wrap
        {
            float: left;
            display: inline;
            width: 468px;
            margin-left: 10em;
        }
    </style>

</asp:Content>

You need to have the class structures properly or else treeview will not be rendered (class structures for the children items)

The Page should inherit:

Inherits="System.Web.Mvc.ViewPage<IEnumerable<GridWithWindow.Jaguar> an IEnumerable list/obj of your class

Collectives™ on Stack Overflow

Problem with treeView MVC extention

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related