Intersoft Community - WebGrid Enterprise - BindingOperationMode="ClientBinding" PrepareDataBinding doesn't run and grid show blank

BindingOperationMode="ClientBinding" PrepareDataBinding doesn't run and grid show blank

yudi — Tue, 27 Jan 2015 02:31:42 GMT

I will have this discussed with the WebGrid development team. I will get back to you with any news regarding this.

BindingOperationMode="ClientBinding" PrepareDataBinding doesn't run and grid show blank

alan@etimemachine.com — Fri, 23 Jan 2015 03:09:15 GMT

Hi Judi,
Is this the issue of Webgrid or Is this by designed?
Because I have to manually add/remove columns in PrepareDataBinding method. So if do like your suggestion, I'll have to duplicate code in PrepareDataBinding to Webgrid_Load. And this is not the best practice (duplicate code everywhere). Otherwise I have a hundreds of forms need to migrate and because of this issue I'll have much work to do.
Beside in your proposal here, I can see the flow that client side binding call initalizadatasource -> preparedatabinding. But in fact, your webgrid didn't call preparedatabinding when turn on client side "ServerDataSource" mode. I think this is your webgrid bug and if it is, please add it to your issues and tell me about the hotfix that fixed this bug.

Regards

BindingOperationMode="ClientBinding" PrepareDataBinding doesn't run and grid show blank

yudi — Thu, 22 Jan 2015 08:08:12 GMT

I managed to resolve this by removing RetrieveStructure() from PrepareDataBinding and add it to OnLoad server-side event (such as shown in the following snippet code).

protected void WebGrid1_PrepareDataBinding(object sender, DataSourceEventArgs e)
{
    // remove RetrieveStructure from
    // PrepareDataBinding server-side event
    // WebGrid1.RetrieveStructure();
}

protected void WebGrid1_Load(object sender, EventArgs e)
{
    // invoke RetrieveStructure in
    // OnLoad server-side event
    WebGrid1.RetrieveStructure();
}

Hope this helps.

BindingOperationMode="ClientBinding" PrepareDataBinding doesn't run and grid show blank

alan@etimemachine.com — Tue, 20 Jan 2015 10:03:31 GMT

Hi Intersoft,

I try to upgrade my webgrid from 6 to 9 using ClientBinding technology for best performance.

But I found the issue that when using BindingOperationMode="ClientBinding" with PrepareDataBinding to build columns structure, it doesn't work.

When the first time load (IsPostBack is false), WebGrid doesn't call PrepareDataBinding method. Hence the grid show data in blank (no column in client side).

This is my sample

File Default.aspx.cx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using ISNet.WebUI.WebGrid;

namespace TestWebGrid
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            
        }

        protected void WebGrid1_InitializeDataSource(object sender, ISNet.WebUI.WebGrid.DataSourceEventArgs e)
        {
            DataTable dt = new DataTable();

            dt.Columns.Add(new DataColumn("CustomerID", typeof(string)));
            dt.Columns.Add(new DataColumn("CompanyName", typeof(string)));
            dt.Columns.Add(new DataColumn("Phone", typeof(string)));

            //if (((ISNet.WebUI.WebGrid.WebGrid)(sender)).ActionName == PostBackAction.LoadData)
            //{                  
                for (int i = 1; i <= 20; i++)
                    dt.Rows.Add(new object[] { i.ToString(), "Company " + i.ToString(), "12345678" + i.ToString() });
            //}
            e.DataSource = dt;
        }

        protected void WebGrid1_PrepareDataBinding(object sender, DataSourceEventArgs e)
        {
            WebGrid1.RetrieveStructure();
        }        
    }
}

File Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestWebGrid.Default" %>

<%@ Register assembly="ISNet.WebUI.WebGrid" namespace="ISNet.WebUI.WebGrid" tagprefix="ISWebGrid" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <ISWebGrid:WebGrid ID="WebGrid1" runat="server" Height="250px" UseDefaultStyle="True" Width="500px"                        
            BindingOperationMode="ClientBinding" OnInitializeDataSource="WebGrid1_InitializeDataSource" OnPrepareDataBinding="WebGrid1_PrepareDataBinding">
            <LayoutSettings AllowContextMenu="False" ContextMenuAnimation="False" AlwaysShowHelpButton="False">                 
            </LayoutSettings>                    
        </ISWebGrid:WebGrid>               
    </div>
    <div>

    </div>
    </form>
</body>
</html>

Regards