我想从GridView中删除选定的行。为此我写了下面的代码，但我得到了一个例外：
System.Web.dll中出现未处理的“System.StackOverflowException”类型异常
这是我的aspx.page：
<asp:gridview ID="Gridview1" runat="server" ShowFooter="true"
onrowcommand="Gridview1_RowCommand" AutoGenerateColumns="false"
CellSpacing="0" CellPadding="0" Font-Bold="false"
onrowdeleting="Gridview1_RowDeleting">
<Columns>
<asp:TemplateField HeaderText="Select" ControlStyle-Width="50px" HeaderStyle-Font-Bold="false" ControlStyle-Font-Bold="false">
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" Width="80px"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Header 1" HeaderStyle-Font-Bold="false" ControlStyle-Font-Bold="false">
<ItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Width="70px"></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:Label ID="lblTotal" runat="server" Text="Total" Font-Bold="true"></asp:Label>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Header 2" HeaderStyle-Font-Bold="false" ControlStyle-Font-Bold="false">
<ItemTemplate>
<asp:TextBox ID="TextBox2" Width="70px" runat="server" class="calculate" onchange="calculate()"></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="total" runat="server" Width="70px"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Header 3" HeaderStyle-Font-Bold="false" ControlStyle-Font-Bold="false">
<ItemTemplate>
<asp:TextBox ID="TextBox3" Width="70px" runat="server" ></asp:TextBox>
</ItemTemplate>
<FooterStyle HorizontalAlign="Right" />
<FooterTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text="Add New Row" CommandName="AddNewRow" />
<asp:Button ID="btnDelete" runat="server" CommandName="DeleteRow" Text="Delete"
OnClientClick="return DeleteConfirmation();"/>
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:gridview>
以下是aspx页面背后的代码：
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
SetInitialRow();
}
}
private void SetInitialRow()
{
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
dt.Columns.Add(new DataColumn("Column1", typeof(string)));
dt.Columns.Add(new DataColumn("Column2", typeof(string)));
dt.Columns.Add(new DataColumn("Column3", typeof(string)));
dr = dt.NewRow();
dr["RowNumber"] = 1;
dr["Column1"] = string.Empty;
dr["Column2"] = string.Empty;
dr["Column3"] = string.Empty;
dt.Rows.Add(dr);
//dr = dt.NewRow();
//Store the DataTable in ViewState
ViewState["CurrentTable"] = dt;
Gridview1.DataSource = dt;
Gridview1.DataBind();
}
private void AddNewRowToGrid()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//extract the TextBox values
TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["RowNumber"] = i + 1;
drCurrentRow["Column1"] = box1.Text;
drCurrentRow["Column2"] = box2.Text;
drCurrentRow["Column3"] = box3.Text;
rowIndex++;
}
//add new row to DataTable
dtCurrentTable.Rows.Add(drCurrentRow);
//Store the current data to ViewState
ViewState["CurrentTable"] = dtCurrentTable;
//Rebind the Grid with the current data
Gridview1.DataSource = dtCurrentTable;
Gridview1.DataBind();
}
}
else
{
Response.Write("ViewState is null");
}
//Set Previous Data on Postbacks
SetPreviousData();
}
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 1; i < dt.Rows.Count; i++)
{
TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("TextBox3");
box1.Text = dt.Rows[i]["Column1"].ToString();
box2.Text = dt.Rows[i]["Column2"].ToString();
box3.Text = dt.Rows[i]["Column3"].ToString();
rowIndex++;
}
}
}
}
protected void Gridview1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "AddNewRow")
{
AddNewRowToGrid();
}
if (e.CommandName == "DeleteRow")
{
for (int i = 0; i < Gridview1.Rows.Count; i++)
{
CheckBox chkDelete = (CheckBox)
Gridview1.Rows[i].Cells[0].FindControl("chkSelect");
if (chkDelete != null)
{
if (chkDelete.Checked)
{
//strID = GridView1.Rows[i].Cells[1].Text;
//idCollection.Add(strID);
Gridview1.DeleteRow(i);
}
}
}
}
Gridview1.DataBind();
}
protected void Gridview1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
for (int i = 0; i < Gridview1.Rows.Count; i++)
{
CheckBox chkDelete = (CheckBox)
Gridview1.Rows[i].Cells[0].FindControl("chkSelect");
if (chkDelete != null)
{
if (chkDelete.Checked)
{
//strID = GridView1.Rows[i].Cells[1].Text;
//idCollection.Add(strID);
Gridview1.DeleteRow(i);
}
}
}
Gridview1.DataBind();
}
}
答案 0 :(得分：2)
我认为您不需要在代码中实现RowDeleting事件。 RowDeleting事件就是告诉程序一行将被删除。
在您的示例中，RowDeleting事件正在调用DeleteRow方法，这将导致RowDeleting事件被触发，然后圆圈将再次发生。当计算机没有其他选项导致StackOverflowException并结束您的程序时，此圈子最终会结束。