单击""add row""按钮后数据从中继器中消失

Question

我有一个从参考表中拉入数据的中继器。中继器上附加了一个按钮，应该添加一行。该按钮可以很好地添加行，但是，当我在转发器的新文本框中输入数据并再次单击添加行按钮时，输入到先前添加的行中的数据将消失。我需要这些数据保留在按钮添加的那些行中并且不知所措：

页面加载代码：

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Session["dt2"] = null;
}
else
{
if (Session["dt2"] == null)
{
SqlDataAdapter sda2 = new SqlDataAdapter("select i.reference_id as [Ref ID], r.ref_code as [Ref Code], r.title as Title, r.year as Year, i.pages as [Pages] from item_reference i left join [references] r on r.reference_id = i.reference_id left join item_header h on h.item_header_id = i.item_header_id where h.item_id ='" + cloneItemID.Text + "'", con);
dt2 = new DataSet();
sda2.Fill(dt2);
Session["dt2"] = dt2;
}
}
RptRefs.DataSource = (DataSet)Session["dt2"];
RptRefs.DataBind();
}

按钮点击代码：

protected void btnRefAddRow_Click(object sender, EventArgs e)
{
var dt2Data = (DataSet)Session["dt2"];
for (var i =0; i < RptRefs.Items.Count; i++)
{
dt2Data.Tables[0].Rows[i]["Ref ID"] = (RptRefs.Items[i].FindControl("refID") as TextBox).Text;
dt2Data.Tables[0].Rows[i]["Pages"] = (RptRefs.Items[i].FindControl("Pages") as TextBox).Text;
}
var row = dt2Data.Tables[0].NewRow();
row["Ref ID"] = "0"; 
row["Ref Code"] = "";
row["Title"] = "";
row["Pages"] = "";
dt2Data.Tables[0].Rows.Add(row);
Session["dt2"] = dt2Data;
RptRefs.DataSource = dt2Data;
RptRefs.DataBind();
}

Answer 1

问题是你设置了Page_Load中继器的DataSource，即使IsPostBack为真。这样，在单击按钮和执行btnRefAddRow_Click之前，转发器中更改的数据将被覆盖。

将Page_Load更改为仅在IsPostBack为 false 时设置转发器的DataSource。