GridView 在删除事件后不刷新

Question

我在使用 asp.net 时遇到了一个奇怪的问题

GridView

。我有

GridView

绑定到

LinqDataSource

。在

GridView

的行删除事件中，我从数据库中删除该行，但网格未刷新（即使在绑定到数据源之后）。

当我设置断点时，我可以看到

OnRowDeleting

事件在

LinqDS_Selecting

事件之后被触发。但在删除事件后它不会再次被触发！难道是这个原因吗？我做错了什么？

有人可以帮忙吗？非常感谢。

.aspx 文件：

<asp:LinqDataSource
    ID="LinqDS"
    runat="server"
    OnSelecting="LinqDS_Selecting">
</asp:LinqDataSource>

<asp:GridView
    DataSourceID = "LinqDS"
    ID = "gv1"
    runat = "server"  
    DataKeyNames = "InstructionId"
    EnableViewState = "false"
    OnRowDataBound = "gv1_RowDataBound" 
    OnRowDeleting = "gv1_RowDeleting" 
    OnRowCommand = "gv1_RowCommand"
    PageSize = "30" >
    <Columns>
        <!-- My colums --->
    </Columns>
</asp:GridView>

.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{

}

protected void LinqDS_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
    // my linq to sql query
    var query = from  .... .... ;
    e.Result = query;
}

protected void gv1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    int instructionId = (int)gv1.DataKeys[e.RowIndex].Value;
    /// my delete logic
    CTX.SubmitChanges();
    gv1.DataBind();
}

Answer 1

如果您的记录实际上被正确删除，并且网格只是没有显示更改，我会尝试将 GridView 放入 UpdatePanel 中，看看这是否有帮助。

<asp:UpdatePanel runat="server" UpdateMode="Always">
    <ContentTemplate>
        // GridView
    </ContentTemplate>
</asp:UpdatePanel>

Answer 2

我无法指出您的代码中的错误，但我向您提供了我删除数据的代码。

<asp:GridView ID="GridView1" runat="server" OnRowDeleting="Del" DataKeyNames="Clg_ID" BackColor="#DEBA84" 
                BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" CellPadding="3" 
                CellSpacing="2">
                <Columns>
                    <asp:CommandField ShowDeleteButton="True" />
                </Columns>
                <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
                <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
                <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
                <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
                <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
                <SortedAscendingCellStyle BackColor="#FFF1D4" />
                <SortedAscendingHeaderStyle BackColor="#B95C30" />
                <SortedDescendingCellStyle BackColor="#F1E5CE" />
                <SortedDescendingHeaderStyle BackColor="#93451F" />
            </asp:GridView>

.cs 文件

protected void Del(object sender, GridViewDeleteEventArgs e)
    {
        string i = GridView1.DataKeys[0].Value.ToString();
        SqlConnection cn = new SqlConnection();
        cn.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString.ToString();
        cn.Open();
        SqlCommand cmd = new SqlCommand("Delete from Feedback where Clg_ID='" + i + "'", cn);
        cmd.ExecuteNonQuery();
        cmd.Dispose();
        cn.Close();
        Response.Redirect("MFeedback.aspx");
    }

Answer 3

尝试在 GridView 的

EditIndex

方法上将 GridView 的

ItemDeleting

设置为 -1 :

protected void gv1_RowDeleting(object sender, GridViewDeleteEventArgs e) {
    gv1.EditIndex = -1;
    gv1.DataBind();
}

并将删除逻辑移至 GridView 的

RowCommand

方法：

protected void gv1_RowCommand(object sender, GridViewDeleteEventArgs e) {
    If (e.CommandName == "Delete") {
        int instructionId = (int) gv1.DataKeys[e.RowIndex].Value;
        /// my delete logic
        CTX.SubmitChanges();
    }
}

您对删除操作的控制应该类似于：

<asp:LinkButton ID="lbDel" runat="server" Text="Delete" CommandName="Delete" />

Answer 4

我通常在 ObjectDataSource 上指定“DeleteMethod”（在您的情况下为 LinqDataSource）。

    <asp:ObjectDataSource ID="odsInsurerGroupAssignedLogins" runat="server" OldValuesParameterFormatString="{0}"
        TypeName="acg.BusinessLogic.InsurerGroupAssignedLogins"
        SelectMethod="GetInsurerGroupAssignedLogins"
        DeleteMethod="Delete"
        EnablePaging="true"
        StartRowIndexParameterName="startRowIndex"
        MaximumRowsParameterName="maximumRows"
        SelectCountMethod="GetInsurerGroupAssignedLogins_RowCount"
        SortParameterName="sortExpression">
        <SelectParameters>
            <asp:ControlParameter Name="insuranceCompanyGroupID" ControlID="ddlInsuranceCompanyGroupID" PropertyName="Text" Type="Int32" />
            <asp:ControlParameter Name="loginID" ControlID="ddlLoginID" PropertyName="Text" Type="Int32" />
        </SelectParameters>
    </asp:ObjectDataSource>

这是删除按钮。

<asp:TemplateField ShowHeader="False">
    <ItemTemplate>
        <asp:ImageButton ID="btnDelete" ImageAlign="Middle" runat="server" ImageUrl="~/MediaFiles/DeleteOut.png"
            AlternateText="Delete" CommandName="Delete" CausesValidation="false" ValidationGroup="Error"
            OnClientClick="return confirm('Are you sure you want to delete this record?');" CssClass="btnDelete" />
    </ItemTemplate>
    <ItemStyle CssClass="LastCol" />
</asp:TemplateField>