[英]Delete row from database in gridview and c#
我正在使用带有编辑和删除按钮的gridview。
当我在gridview中删除特定行时,它将被删除。 但是我再次加载页面,再次显示已删除的行。 我的意思是,行不会在数据库中删除。
这是我的代码:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
SqlConnection con = Connection.DBconnection();
if (e.CommandName == "EditRow")
{
GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;
int index = gr.RowIndex;
hiddenfield.Value = index.ToString();
Textid.Text = gr.Cells[1].Text;
Textusername.Text = gr.Cells[2].Text;
Textclass.Text = gr.Cells[3].Text;
Textsection.Text = gr.Cells[4].Text;
Textaddress.Text = gr.Cells[5].Text;
}
else if (e.CommandName == "Deleterow")
{
GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;
SqlCommand com = new SqlCommand("StoredProcedure4", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@ID", gr.Cells[0].Text);
var id = Int32.Parse(e.CommandArgument.ToString());
GridView1.Rows[id].Visible = false;
com.ExecuteNonQuery();
Response.Redirect("studententry.aspx");
}
}
和asp文件:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" DataSourceID="SqlDataSource1"
OnRowCommand="GridView1_RowCommand" AutoGenerateSelectButton="True"
EnablePersistedSelection="True" BackColor="White" EnableViewState="true" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Class" HeaderText="Class" SortExpression="Class" />
<asp:BoundField DataField="Section" HeaderText="Section"
SortExpression="Section" />
<asp:BoundField DataField="Address" HeaderText="Address"
SortExpression="Address" />
<asp:TemplateField HeaderText="Edit">
<ItemTemplate>
<asp:Button runat="server" ID="btnedit" Text="Edit" CommandName="EditRow"></asp:Button>
</ItemTemplate>
<ControlStyle BorderColor="#CCFF66" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Container.DataItemIndex %>' CommandName="Deleterow"></asp:Button>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<SelectedRowStyle BackColor="#FF66FF" />
</asp:GridView>
存储过程:
ALTER PROCEDURE StoredProcedure4
(
@id int
)
AS
begin
Delete from Student where id=@id
End
我是.net的新手。 谁能帮我解决这个问题?
谢谢,
传递参数无效@id
更改@ID
ALTER PROCEDURE StoredProcedure4
(
@ID as int=0
)
AS
begin
Delete from Student where id=@ID
End
另一种方式可能是
使用Commandargument的简短答案 Pass ID
完整答案
更换
<asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Container.DataItemIndex %>' CommandName="Deleterow"></asp:Button>
通过
<asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Eval("ID") %>' CommandName="Deleterow"></asp:Button>
在aspx和cs中
更换
else if (e.CommandName == "Deleterow")
{
GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;
SqlCommand com = new SqlCommand("StoredProcedure4", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@ID", gr.Cells[0].Text);
var id = Int32.Parse(e.CommandArgument.ToString());
GridView1.Rows[id].Visible = false;
com.ExecuteNonQuery();
Response.Redirect("studententry.aspx");
}
通过
else if (e.CommandName == "Deleterow")
{
SqlCommand com = new SqlCommand("StoredProcedure4", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@ID", Convert.ToInt32(e.CommandArgument));
var id = Int32.Parse(e.CommandArgument.ToString());
GridView1.Rows[id].Visible = false;
com.ExecuteNonQuery();
Response.Redirect("studententry.aspx");
}
在删除按钮中将Id作为命令参数传递,并如下所示访问后面的代码。
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Eval("Id") %>' CommandName="Deleterow"></asp:Button>
</ItemTemplate>
</asp:TemplateField>
else if (e.CommandName == "Deleterow")
{
SqlCommand com = new SqlCommand("StoredProcedure4", con);
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@id", Convert.ToInt32(e.CommandArgument));
var id = Int32.Parse(e.CommandArgument.ToString());
GridView1.Rows[id].Visible = false;
com.ExecuteNonQuery();
Response.Redirect("studententry.aspx");
}
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