单击GridView查找所选行

Question

我正在尝试使用GridView并从单击的行中获取数据.我已经尝试了下面的代码,当我单击该行时,我返回所选索引,但当我查看GridView中的实际行时,它们显示为空.不确定我错过了什么.

.ASP制作我的网格.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="True" 
        CssClass="datatables" Width="100%" 
        DataSourceID="SqlDataSource1" 
        GridLines="None" ShowFooter="True" AllowSorting="True"  
        onrowcreated="GridView1_RowCreated" 
        onrowdatabound="GridView1_RowDataBound" ShowHeaderWhenEmpty="True" 
        onrowcommand="GridView1_RowCommand" 
        onselectedindexchanged="GridView1_SelectedIndexChanged">
        <HeaderStyle CssClass="hdrow" />
        <RowStyle CssClass="datarow" />
        <PagerStyle CssClass="cssPager" />
</asp:GridView>

在每行数据绑定上,我确保单击应设置所选索引.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
     if (e.Row.RowType == DataControlRowType.DataRow)
     {
        e.Row.Attributes["onclick"] = Page.ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" + e.Row.RowIndex);
     }
 }

然后,当所选索引通过单击此更改被触发时,我可以在第一行放置断点,并且我看到我点击的索引存储在a中.然而,当我到达foreach时,它会跳过它,因为它显示GridView1的Count为0行.理论上它应该有几百行,当索引匹配时,它应该抓取第6个单元格中的数据并将其存储在字符串b中.为什么我的点击没有行？

 protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
 {
            int a = GridView1.SelectedIndex

            foreach (GridViewRow row in GridView1.Rows)
            {
                if (row.RowIndex == a)
                {
                    b = row.Cells[6].Text;
                }
            }
 }

这是我的页面加载.

protected void Page_Load(object sender, EventArgs e)
{
      c = HttpContext.Current.Session["c"].ToString();
      SqlDataSource1.ConnectionString = //My secret
      string strSelect = "SELECT columnnames from tablenames where c in (@c)
      SqlDataSource1.SelectParameters.Clear();
      SqlDataSource1.SelectCommand = strSelect;
      SqlDataSource1.SelectParameters.Add("c", c);
       try
        {
            GridView1.DataBind();
        }
        catch (Exception e)
        {

        }
        GridView1.AutoGenerateColumns = true;
}

Answer 1

尝试从SelectedRow属性中抓取行:

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
    GridViewRow row = GridView1.SelectedRow;
    string b = row.Cells[6].Text;
}

我的理解是,当您使用这些数据源控件(如SqlDataSource)时,Rows集合不会在PostBacks上重新填充.

如果.DataBind()在尝试迭代行之前调用GridView,则可以使用现有代码:

GridView1.DataSourceID="SqlDataSource1";
GridView1.DataBind();

但这似乎有点hacky.

看到你的Page_Load后,我发现你需要将数据绑定代码包装在一个if(!Page.IsPostBack)块中.每个回发上的数据绑定都会中断ASP.NET通过ViewState维护控件状态的过程.