问题
I have a grid on my page and using check box for checking one or more than one row in grid and i want to delete checked row from grid on the click of delete button which is out side the grid..
In table i have only name field there is no field like ID.
How can i delete record.
Thanks in advance..
Here is my code What i am doing:-
private void GetData()
{
ArrayList arr;
if (ViewState["TotalRecords"] != null)
{
arr = (ArrayList)ViewState["TotalRecords"];
}
else
{
arr = new ArrayList();
}
for (int i = 0; i < grdlistWord.Rows.Count; i++)
{
CheckBox chk = (CheckBox)grdlistWord.Rows[i].Cells[1].FindControl("chkWord");
if (chk.Checked)
{
if (!arr.Contains(grdlistWord.Rows[i].Cells[1]))
{
arr.Add(grdlistWord.Rows[i].Cells[1]);
}
}
else
{
if (arr.Contains(grdlistWord.Rows[i].Cells[1]))
{
arr.Remove(grdlistWord.Rows[i].Cells[1]);
}
}
}
ViewState["TotalRecords"] = arr;
}
protected void lnkbtnDelete_Click(object sender, EventArgs e)
{
try
{
int count = 0;
ArrayList arr = (ArrayList)ViewState["TotalRecords"];
count = arr.Count;
for (int i = 0; i < grdlistWord.Rows.Count; i++)
{
if (arr.Contains(grdlistWord.Rows[i].Cells[1].Text))
{
Response.Write(grdlistWord.Rows[i].Cells[1].Text.ToString());
DeleteRecord(grdlistWord.Rows[i].Cells[1].Text.ToString());
arr.Remove(grdlistWord.Rows[i].Cells[1].Text);
}
}
ViewState["TotalRecords"] = arr;
GridBind();
}
catch (SqlException ex)
{
ex.ToString();
}
}
private void DeleteRecord(string word)
{
string query = "delete from searchword where word=@word";
SqlCommand cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("@word", word);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
gridview html detail:
<fieldset>
<legend>List</legend>
<asp:GridView ID="grdlistWord" runat="server" DataKeyNames="word" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" AllowPaging="True" OnRowDataBound="grdlistWord_RowDataBound" OnRowDeleting="grdlistWord_RowDeleting">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkWord" runat="server" onclick="check_click(this);" />
</ItemTemplate>
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server" onclick="checkAll(this);" />
<asp:LinkButton ID="ButtonDelete" runat="server" Text="Delete" OnClick="ButtonDelete_Click"></asp:LinkButton>
</HeaderTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Word" HeaderText="Word" />
<asp:HyperLinkField HeaderText="Edit" Text="edit" DataNavigateUrlFields="Word" DataNavigateUrlFormatString="SearchWord.aspx?words={0}&mode=Edit" />
<asp:CommandField ShowDeleteButton="True" HeaderText="Delete" />
</Columns>
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<EditRowStyle BackColor="#999999" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<EmptyDataTemplate>Records not exist!</EmptyDataTemplate>
</asp:GridView>
<asp:HiddenField ID="hfCount" runat="server" Value = "0" />
</fieldset>
回答1:
protected void lnkbtnDelete_Click(object sender, EventArgs e)
{
int counter = 0;
List<string> words = new List<string>();
foreach (GridViewRow rowitem in grdlistWord.Rows)
{
if (((CheckBox)rowitem.Cells[0].FindControl("chkWord")).Checked == true)//i consider that the check box is in the first column index ---> 0
{
counter++;
words.Add(rowitem.Cells[1].Text); //i consider that the word is in the second column index ---> 1
}
}
/////////////////////////////////////////////////////////////
if(counter == 0) //no checks
{
//show some message box to clarify that no row has been selected.
}
/////////////////////////////////////////////////////////////
if (counter == 1) //one check
{
DeleteRecord(words[0]);
//Show some message box to clarify that the operation has been executed successfully.
}
/////////////////////////////////////////////////////////////
if (counter > 1) //more than one check
{
for(int i=0; i<words.Count;i++)
{
DeleteRecord(words[i]);
}
//Show some message box to clarify that the operation has been executed successfully.
}
grdlistWord.DataBind();
}
回答2:
For this purpose you have set a primary key id first in your table, which you are fetching as a source of the Grid.
After binding the grid you should save that id in a hidden field. see the code below:
<asp:GridView ID="gvwID" runat="server" AutoGenerateColumns="False"
DataKeyNames="TableID">
<Columns>
<asp:TemplateField>
<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("TableID") %>'/>
<asp:TemplateField>
</Columns>
</asp:GridView>
Then in the delete button click event get the selected row ids:
protected void Btn_Click(object sender, EventArgs e)
{
int[] OrderIDList = new int[gvwID.Rows.Count];
int index = 0;
for (int count = 0; count < gvwID.Rows.Count; count++)
{
if (gvwID.Rows[count].FindControl("chkSelect") != null)
{
if (((CheckBox)gvwID.Rows[count].FindControl("chkSelect")).Checked)
{
if (gvwID.Rows[count].FindControl("HiddenField1") != null)
{
string OrderID = ((HiddenField)gvwID.Rows[count].FindControl("HiddenField1")).Value;
OrderIDList[index++] = Convret.ToInt32(OrderID);
}
}
}
}
Then create an appended string from OrderIDList and pass it to the stored procedure. from the stored procedure create an xml using the appended string. Loop through the xml and get each id and perform the deletion.
see the procedure below:
@IDList varchar(MAX)
DECLARE @xmlUserIDs xml
SELECT @xmlUserIDs = CONVERT(xml,'<root><cat>' + REPLACE(@IDList,',','</cat><cat>') + '</cat></root>')// creates xml from appended string
DELETE FROM
[TableName]
WHERE
[TableID] IN (SELECT
[Value] = T.C.value('.','int')
FROM
@xmlUserIDs.nodes('/root/cat') T(C));
Hope this helps you..
来源：https://stackoverflow.com/questions/6054341/how-can-i-delete-selected-data-from-grid-on-the-button-click-event