ASP.NET 2.0 回发在第一次回发后停止工作

Question

我有一个使用 PagedDataSource 的 DataList 控件，页面加载正常，数据显示正常。 我还有另一个 DataList，它为分页提供页码。

当用户单击任何页码时，如果执行回发并递增 PagedDataSource CurrentPage 属性。

第一次点击时效果很好。页面重新加载到正确的页面上。但是，再次单击任何页面不会导致回发。页面似乎“闪烁”但我没有收到服务器端代码停止被击中，不像我第一次点击它。

我认为第一次回发会以某种方式搞砸回发，但我不知道为什么。

对此有什么想法吗？这是页面加载和绑定代码..

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Trace.Write("Before BindItemsList() " + DateTime.Now.ToLongTimeString());
            this.BindItemsList();
            Trace.Write("After BindItemsList() " + DateTime.Now.ToLongTimeString());
        }
    }

private void BindItemsList()
{
        DataTable dataTable = new DataTable();
        if (Cache["dtItems"] != null)
            dataTable = (DataTable)Cache["dtItems"];
        else
            dataTable = this.GetDataTable();

        _PageDataSource.DataSource = dataTable.DefaultView;
        _PageDataSource.AllowPaging = true;
        _PageDataSource.PageSize = 9;
        _PageDataSource.CurrentPageIndex = CurrentPage;
        ViewState["TotalPages"] = _PageDataSource.PageCount;

        this.lblPageInfo.Text = "Page  " + (CurrentPage + 1) + "   of   " + _PageDataSource.PageCount;
        this.ibtnPrevious.Enabled = !_PageDataSource.IsFirstPage;
        this.ibtnNext.Enabled = !_PageDataSource.IsLastPage;
        this.ibtnFirst.Enabled = !_PageDataSource.IsFirstPage;
        this.ibtnLast.Enabled = !_PageDataSource.IsLastPage;

        this.dlProducts.DataSource = _PageDataSource;
        this.dlProducts.DataBind();
        this.doPaging();
}

protected void ibtnFirst_Click(object sender, ImageClickEventArgs e)
{
    CurrentPage = 0;
    this.BindItemsList();
}
protected void ibtnPrevious_Click(object sender, ImageClickEventArgs e)
{
    CurrentPage -= 1;
    this.BindItemsList();
}
protected void ibtnNext_Click(object sender, ImageClickEventArgs e)
{
    CurrentPage += 1;
    this.BindItemsList();
}
protected void ibtnLast_Click(object sender, ImageClickEventArgs e)
{
    CurrentPage = (Convert.ToInt32(ViewState["TotalPages"]) - 1);
    this.BindItemsList();
}
protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
{
    if (e.CommandName.Equals("Paging"))
    {
        CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
        this.BindItemsList();
    }
}

/// <summary>
/// Binding Paging List
/// </summary>
private void doPaging()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("PageIndex");
    dt.Columns.Add("PageText");

    fistIndex = CurrentPage - 5;


    if (CurrentPage > 5)
    {
        lastIndex = CurrentPage + 4;
    }
    else
    {
        lastIndex = 9;
    }
    if (lastIndex > Convert.ToInt32(ViewState["TotalPages"]))
    {
        lastIndex = Convert.ToInt32(ViewState["TotalPages"]);
        fistIndex = lastIndex - 9;
    }

    if (fistIndex < 0)
    {
        fistIndex = 0;
    }

    for (int i = fistIndex; i < lastIndex; i++)
    {
        DataRow dr = dt.NewRow();
        dr[0] = i;
        dr[1] = i + 1;
        dt.Rows.Add(dr);
    }

    this.dlPaging.DataSource = dt;
    this.dlPaging.DataBind();
    this.dlBottomPaging.DataSource = dt;
    this.dlBottomPaging.DataBind();
}

Answer 1

如果您在页面加载时检查 ISpostback，请从 ISpostback 范围中获取您的列表绑定。