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radgrid ItemDataBound event fire twice is it bug?

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zpc
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zpc asked on 04 Jun 2010, 09:36 AM
Test code below:

aspx
<telerik:RadGrid runat="server" ID="rgContents" AutoGenerateColumns="false"   
        AllowPaging="true" AllowCustomPaging="true" PageSize="10"   
        OnPageIndexChanged="rgContents_PageIndexChanged"   
        OnItemDataBound="rgContents_ItemDataBound">  
        <MasterTableView> 
            <Columns> 
                <telerik:GridTemplateColumn> 
                    <ItemTemplate> 
                        Times: <asp:Literal ID="ltlTimes" runat="server" /> 
                    </ItemTemplate> 
                </telerik:GridTemplateColumn> 
            </Columns> 
        </MasterTableView> 
        <PagerStyle Mode="NextPrevNumericAndAdvanced" /> 
    </telerik:RadGrid> 

asp.cs
private int Times  
    {  
        get 
        {  
            return ViewState["Times"] != null ? (int)ViewState["Times"] : 0;  
        }  
        set 
        {  
            ViewState["Times"] = value;  
        }  
    }  
 
    protected void Page_Load(object sender, EventArgs e)  
    {  
        if (!IsPostBack)  
        {  
            Bind();  
        }  
    }  
 
    protected void rgContents_PageIndexChanged(object source, GridPageChangedEventArgs e)  
    {  
        rgContents.CurrentPageIndex = e.NewPageIndex;  
        Bind();  
    }  
 
    protected void rgContents_ItemDataBound(object sender, GridItemEventArgs e)  
    {  
        if (e.Item.ItemType == GridItemType.Item || e.Item.ItemType == GridItemType.AlternatingItem)  
        {  
            Times = Times + 1;  
            Literal ltlTimes = e.Item.FindControl("ltlTimes"as Literal;  
            ltlTimes.Text = Times.ToString();  
        }  
    }  
 
    private void Bind()  
    {  
        var biz = new ContentBiz();  
        var contents = biz.GetAll();  
 
        int pageSize = rgContents.PageSize;  
        int start = rgContents.CurrentPageIndex * pageSize;  
        int count = contents.Count();  
 
        var dataSource = contents.Skip(start).Take(pageSize);  
 
        rgContents.VirtualItemCount = count;  
        rgContents.DataSource = dataSource;  
        rgContents.DataBind();  
    } 

when I change page index post back will fire itemdatabound twice.
I am call rgContents.DataBind() in the rgContents_PageIndexChanged, this line code will cause that.
and when use NeedDataSource will correct, but above code why cannot work correct?

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Shinu
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answered on 04 Jun 2010, 11:48 AM
Hello,

 I think the problem is because of calling the DataBind() method after setting the DataSource property. You can refer the Simple data binding demo for more information.

Regards,
Shinu.
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zpc
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