我在gridview中有4-5 checkbox。我想将其值保存到数据库中，如
如果checked == true，则"Y"其他"N"
但是错误
对象引用未设置为对象的实例
我将所有复选框定义如下
GridDataControlFieldCell chkcellAdd = GrdRights.RowsInViewState[i].Cells[4] as GridDataControlFieldCell;
GridDataControlFieldCell chkcellView = GrdRights.RowsInViewState[i].Cells[5] as GridDataControlFieldCell;
GridDataControlFieldCell chkcellEdit= GrdRights.RowsInViewState[i].Cells[6] as GridDataControlFieldCell;
GridDataControlFieldCell chkcellDelete = GrdRights.RowsInViewState[i].Cells[7] as GridDataControlFieldCell;
CheckBox chkadd = chkcellAdd.FindControl("ChkIDAdd") as CheckBox;
CheckBox chkview = chkcellView.FindControl("ChkIDView") as CheckBox;
CheckBox chkedit = chkcellEdit.FindControl("ChkIDEdit") as CheckBox;
CheckBox chkdelete = chkcellDelete.FindControl("ChkIDDelete") as CheckBox;
我尝试了here的链接，但收到同样的错误。
请说明这里有什么问题
我的gridview的HTML： -
<cc2:Grid ID="GrdRights" runat="server" FolderStyle="../Styles/Grid/style_12"
AllowSorting="False" AutoGenerateColumns="False" AllowColumnResizing="true" AllowAddingRecords="false"
AllowMultiRecordSelection="true" OnRowDataBound="GrdRights_RowDataBound" ViewStateMode="Enabled"
PageSize="100">
<ClientSideEvents OnClientSelect="FunMonthList" />
<ScrollingSettings ScrollHeight="400px" />
<Columns>
<cc2:Column ID="Column1" DataField="MKEY" ShowHeader="false" HeaderText="Select" ReadOnly="true"
Width="5%" runat="server">
<TemplateSettings TemplateId="TemplateWithCheckbox" />
</cc2:Column>
<cc2:Column ID="Column2" DataField="parent_menu" HeaderText="MENU" Visible="true"
ReadOnly="true" Width="10%" runat="server">
</cc2:Column>
<cc2:Column ID="Column4" DataField="child_menu_mkey" Visible="false" ReadOnly="true"
Width="10%" runat="server">
</cc2:Column>
<cc2:Column ID="Column3" DataField="child_menu" HeaderText="SUB MENU" runat="server"
Visible="true" Width="30%">
</cc2:Column>
<%--<cc2:Column ID="Column5" DataField="MKEY" ShowHeader="false" HeaderText="Select" ReadOnly="true" Width="5%" runat="server">
<TemplateSettings TemplateId="TemplateWithCheckbox" />
</cc2:Column>--%>
<cc2:CheckBoxColumn Id="chkAdd" DataField="ADD_FLAG" ShowHeader="true" HeaderText="Add"
Width="5%" runat="server" Align="right">
<TemplateSettings TemplateId="TemplateWithChecAdd" />
</cc2:CheckBoxColumn>
<cc2:CheckBoxColumn Id="chkEdit" DataField="MODIFY_FLAG" ShowHeader="true" HeaderText="Edit"
Width="5%" runat="server" Align="right">
<TemplateSettings TemplateId="TemplateWithChecEdit" />
</cc2:CheckBoxColumn>
<cc2:CheckBoxColumn Id="ChkView" DataField="VIEW_FLAG" ShowHeader="true" HeaderText="View"
Width="6%" runat="server" Align="right">
<TemplateSettings TemplateId="TemplateWithChecView" />
</cc2:CheckBoxColumn>
<cc2:CheckBoxColumn Id="ChkDelete" DataField="DEL_FLAG" ShowHeader="true" HeaderText="Delete"
Width="8%" runat="server" Align="right">
<TemplateSettings TemplateId="TemplateWithChecDelete" />
</cc2:CheckBoxColumn>
</Columns>
<Templates>
<cc2:GridTemplate ID="TemplateWithChecAdd">
<Template>
<asp:CheckBox runat="server" ID="ChkIDAdd" ToolTip="<%# Container.Value %>" />
</Template>
</cc2:GridTemplate>
<cc2:GridTemplate ID="TemplateWithChecView">
<Template>
<asp:CheckBox runat="server" ID="ChkIDView" ToolTip="<%# Container.Value %>" />
</Template>
</cc2:GridTemplate>
<cc2:GridTemplate ID="TemplateWithChecEdit">
<Template>
<asp:CheckBox runat="server" ID="ChkIDEdit" ToolTip="<%# Container.Value %>" />
</Template>
</cc2:GridTemplate>
<cc2:GridTemplate ID="TemplateWithChecDelete">
<Template>
<asp:CheckBox runat="server" ID="ChkIDDelete" ToolTip="<%# Container.Value %>" />
</Template>
</cc2:GridTemplate>
</Templates>
</cc2:Grid>
更新
根据我的代码现在，我得到了复选框值，但数据没有插入到表中，我收到错误
列名＆＃39; ADD_FLAG＆＃39;在结果列列表中出现多次。 Msg 264，Level 16，State 1，Line 1
列名＆＃39; MODIFY_FLAG＆＃39;在结果列列表中出现多次。 Msg 264，Level 16，State 1，Line 1
列名＆＃39; VIEW_FLAG＆＃39;在结果列列表中出现多次。 Msg 264，Level 16，State 1，Line 1
列名＆＃39; DEL_FLAG＆＃39;在结果列列表中出现多次。
以下是我的代码： -
public bool Save()
{
try
{
for (int i = 0; i < GrdRights.RowsInViewState.Count; i++)
{
string strSQLMKEY = "SELECT WMS_User_Rights.MKEY FROM WMS_User_Rights Inner JOIN WMS_Menu_Rights on " +
"WMS_User_Rights.User_Id = WMS_Menu_Rights.Mkey " +
"where WMS_User_Rights.User_Id='" + Hid_Selected_user.Value + "' " +
"AND WMS_User_Rights.DELETE_FLAG = 'N'";
if (GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("child_menu_mkey")].Text.Trim().ToString() == "0")
{
strSQLMKEY += " and MENU_MKEY='" + GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("MKEY")].Text.Trim() + "'";
}
else
{
strSQLMKEY += " and MENU_MKEY='" + GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("child_menu_mkey")].Text.Trim() + "'";
}
con.Open();
SqlCommand cmdMKEY = new SqlCommand(strSQLMKEY, con);
if (cmdMKEY.ExecuteScalar() != null)
{
strMode = "M";
iMKey = Convert.ToInt32(cmdMKEY.ExecuteScalar());
}
else
{
strMode = "A";
iMKey = 0;
}
con.Close();
System.Text.StringBuilder StrPubBldg = new System.Text.StringBuilder();
XmlWriter xw = XmlWriter.Create(StrPubBldg);
xw.WriteStartElement("DocumentElement");
{
xw.WriteStartElement("WMS_Menu_Rights");
for (int j = 0; j < GrdRights.RowsInViewState.Count; j++)
{
bool str_checkadd = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[4]).FindControl("ChkIDAdd")).Checked;
bool str_checkEdit = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[5]).FindControl("ChkIDEdit")).Checked;
bool str_checkView = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[6]).FindControl("ChkIDView")).Checked;
bool str_checkdel = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[7]).FindControl("ChkIDDelete")).Checked;
xw.WriteElementString("ADD_FLAG", str_checkadd == true ? "Y" : "N");
xw.WriteElementString("MODIFY_FLAG", str_checkEdit == true ? "Y" : "N");
xw.WriteElementString("VIEW_FLAG", str_checkView == true ? "Y" : "N");
xw.WriteElementString("DEL_FLAG", str_checkdel == true ? "Y" : "N");
if (GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("child_menu_mkey")].Text.Trim().ToString() == "0")
{
xw.WriteElementString("MENU_MKEY", GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("MKEY")].Text.Trim());
}
else
{
xw.WriteElementString("MENU_MKEY", GrdRights.Rows[i].Cells[GrdRights.Columns.GetColumnIndexByDataField("child_menu_mkey")].Text.Trim());
}
xw.WriteElementString("USER_ID", Hid_Selected_user.Value);
xw.WriteElementString("DELETE_FLAG", "N");
xw.WriteElementString("CREATION_DATE", System.DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss"));
}
xw.WriteEndElement();
xw.Close();
MainEnqMkey = InsertUpdateDelete.InsertUpdateDeleteCls.InsertUpdateDelete_sql(strMode, Convert.ToInt16(iMKey), "WMS_Menu_Rights", "MKEY", "MUR", StrPubBldg.ToString());
}
}
if (MainEnqMkey.Equals(0))
{
ClientScript.RegisterStartupScript(this.GetType(), "SuccessScript", "alert('Some Error Occured While Saving Data !!')", true);
}
else
{
con.Open();
SqlCommand ObjPriCmd = new SqlCommand("delete from WMS_User_rights where MKEY=" + HidTempMkey.Value, con);
ObjPriCmd.ExecuteNonQuery();
con.Close();
if (!Directory.Exists(Server.MapPath(StrFolder)))
{
Directory.CreateDirectory(Server.MapPath(StrFolder));
}
if (File.Exists(Server.MapPath(StrFolder + StrFileName)) == false)
{
using (System.IO.StreamWriter sw = File.CreateText(Server.MapPath(StrFolder + StrFileName)))
{
sw.WriteLine("\n");
sw.WriteLine("\n"); sw.NewLine = "\n------------------------------------------------------------------";
sw.WriteLine("\n");
sw.Close();
sw.Dispose();
}
}
else
{
using (System.IO.StreamWriter sw = File.AppendText(Server.MapPath(StrFolder + StrFileName)))
{
sw.WriteLine("\n");
sw.WriteLine("\n"); sw.NewLine = "------------------------------------------------------------------";
sw.WriteLine("\n");
sw.Close();
sw.Dispose();
}
}
}
return true;
}
catch (Exception ex)
{
if (!Directory.Exists(Server.MapPath(StrFolder)))
{
Directory.CreateDirectory(Server.MapPath(StrFolder));
}
if (File.Exists(Server.MapPath(StrFolder + StrFileName)) == false)
{
using (System.IO.StreamWriter sw = File.CreateText(Server.MapPath(StrFolder + StrFileName)))
{
sw.WriteLine("\n");
sw.WriteLine("\n"); sw.NewLine = "\n------------------------------------------------------------------";
sw.WriteLine("\n");
sw.Close();
sw.Dispose();
}
}
else
{
using (System.IO.StreamWriter sw = File.AppendText(Server.MapPath(StrFolder + StrFileName)))
{
sw.WriteLine("\n");
sw.WriteLine("\n"); sw.NewLine = "------------------------------------------------------------------";
sw.WriteLine("\n");
sw.Close();
sw.Dispose();
}
}
return false;
}
finally
{
}
}
protected void CmdSave_Click(object sender, EventArgs e)
{
if (Save() == true)
{
fillGrid();
if (strMode == "M")
{
ClientScript.RegisterStartupScript(this.GetType(), "CloseScript", "alert('Record Modified Successfully');window.location.href='Frm_User_Rights.aspx?TranType=MUR&Mode=A&Key=0&PView=N&userid=" + Request.QueryString["userid"].ToString() + "';", true);
}
else
{
ClientScript.RegisterStartupScript(this.GetType(), "CloseScript", "alert('Record Saved Successfully');window.location.href='Frm_User_Rights.aspx?TranType=MUR&Mode=A&Key=0&PView=N&userid=" + Request.QueryString["userid"].ToString() + "';", true);
}
}
}
答案 0 :(得分：1)
每个GridViewRow都包含这些复选框，并且是NamingContainer - 控件，其中ach ID必须是唯一的，因此您需要在每一行上使用FindControl：
foreach (GridViewRow row in GrdRights.Rows)
{
CheckBox chkadd = row.FindControl("ChkIDAdd") as CheckBox;
CheckBox chkview = row.FindControl("ChkIDView") as CheckBox;
CheckBox chkedit = row.FindControl("ChkIDEdit") as CheckBox;
CheckBox chkdelete = row.FindControl("ChkIDDelete") as CheckBox;
xw.WriteElementString("ADD_FLAG", chkadd.Checked == true ? "Y" : "N");
xw.WriteElementString("MODIFY_FLAG", chkedit.Checked == true ? "Y" : "N");
xw.WriteElementString("VIEW_FLAG", chkview.Checked == true ? "Y" : "N");
xw.WriteElementString("DEL_FLAG", chkdelete.Checked == true ? "Y" : "N");
}
我不熟悉obout Grid，但似乎这适合你：
for (int j = 0; j < GrdRights.RowsInViewState.Count; j++)
{
bool str_checkadd = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[4]).FindControl("ChkIDAdd")).Checked;
bool str_checkEdit = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[5]).FindControl("ChkIDEdit")).Checked;
bool str_checkView = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[6]).FindControl("ChkIDView")).Checked;
bool str_checkdel = ((CheckBox)((GridDataControlFieldCell)GrdRights.RowsInViewState[j].Cells[7]).FindControl("ChkIDDelete")).Checked;
// ....
}
<击>
<击>但即使我不知道这个RowsInViewState，也应该可以使用这个更简单的代码：
for (int j = 0; j < GrdRights.RowsInViewState.Count; j++)
{
CheckBox checkadd = (CheckBox) GrdRights.RowsInViewState[j].FindControl("ChkIDAdd");
CheckBox checkEdit = (CheckBox) GrdRights.RowsInViewState[j].FindControl("ChkIDEdit");
CheckBox chkView = (CheckBox) GrdRights.RowsInViewState[j].FindControl("ChkIDView");
CheckBox chkDel= (CheckBox) GrdRights.RowsInViewState[j].FindControl("ChkIDDel");
// ....
}
<击>
答案 1 :(得分：0)
我在网格视图中没有多少经验，但我认为你循环错误的方式..你循环每一行包括标题，所以请检查行是否是数据行然后尝试查找复选框
这里有一些代码，我发现希望这会对你有所帮助
foreach (GridViewRow row in GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
CheckBox chkRow = (row.Cells[0].FindControl("chkRow") as CheckBox);
if (chkRow.Checked)
{
//your code
}
}
}