Geek asks and answers

ASP.NET ListView Paging: Invalid View State

I have a ListView control as follows (to publish here, I removed the values ​​from my ItemTemplate):

<asp:ListView ID="ListView1" runat="server" DataSourceID="MyDataSource">
  <LayoutTemplate>
     <div id="requests" runat="server">
        <asp:Panel runat="server" id="itemPlaceholder"></asp:Panel>
     </div>
     <asp:DataPager runat="server" ID="DataPager" PageSize="3">
        <Fields>
            <asp:NumericPagerField ButtonCount="10" PreviousPageText="<--" NextPageText="-->" />
        </Fields>
     </asp:DataPager>
  </LayoutTemplate>
  <ItemTemplate>
     <div ID="itemPlaceholder" class="request" runat="server">
        <asp:LinkButton ID="button" runat="server" Text='...' CommandName="..." 
                CommandArgument='...' OnClick="..."
                style="...">
        </asp:LinkButton> -  
     </div>
  </ItemTemplate>
</asp:ListView>

This ListView exists as a user control (.ascx) that I have embedded in an ASPX web page.

As I expected, when the web page loads, for a list of 9 elements I get 3 pages of 3 items.

When I click to go to the next page, the page loads the next set of elements correctly ... but only for a short second. Then a strange thing happens. The page inserts a copy of itself into the page 6 times, each of which is under one of the form fields inside the page.

If I try to go to the next or previous page, an ASP.NET server error will appear:

.

:

FormatException: Base-64, - , .

ViewStateException: .

, IE8 Chrome.

+3
1

listview OnPagePropertiesChanging

 <asp:ListView ID="lvCustomers" runat="server"   GroupPlaceholderID="groupPlaceHolder1"
ItemPlaceholderID="itemPlaceHolder1"    OnPagePropertiesChanging="OnPagePropertiesChanging">

aspx.cs

protected void OnPagePropertiesChanging(object sender,PagePropertiesChangingEventArgs e)
{
    (lvCustomers.FindControl("DataPager1") as  DataPager).SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
this.BindListView();
}

BindListView() -

,

,

0

More articles:


All Articles