asp.net C＃中子gridview抛出异常的行删除事件

Question

我进行了很多搜索，但找不到解决我问题的方法。

使用C＃.Net，Asp.net 3.5，我在主子关系中有2个gridview控件，如下所示：

<asp:GridView  ID="gridViewExistingSchedules" 
                                    runat="server" DataKeyNames="SchedulerId"
                                    AutoGenerateColumns="false" 
                                    OnRowDataBound="gridViewExistingSchedules_RowDataBound"
                                    OnRowCommand="gridViewExistingSchedules_RowCommand" 
                                    OnRowDeleting="gridViewExistingSchedules_RowDeleting">

                                    <Columns>
                                        <asp:TemplateField ItemStyle-Width="20px">
                                            <ItemTemplate>
                                                    <asp:GridView 
                                                        ID="gridViewSchedulerDetails" 
                                                        runat="server" 
                                                        AutoGenerateColumns="false"
                                                        DataKeyNames="SchedulerId">

                                                        <Columns>
                                                            <asp:BoundField DataField="DetailId" Visible="false" />
                                                            <asp:BoundField DataField="Survey" HeaderText="Survey" />
                                                            <asp:BoundField DataField="TimeDescription" HeaderText="Time" />
                                                            <asp:BoundField DataField="FromDate" HeaderText="From Date" />
                                                            <asp:BoundField DataField="ToDate" HeaderText="To Date" />

                                                            <asp:TemplateField>
                                                                <ItemTemplate>
                                                                    <asp:ImageButton ID="imgDelete" CommandArgument='<%# Bind("SchedulerId")%>' CommandName="Delete"
                                                                        runat="server" ImageUrl="~/images/delete1.png" />
                                                                </ItemTemplate>
                                                            </asp:TemplateField>

                                                            <asp:TemplateField>
                                                                <ItemTemplate>
                                                                    <asp:ImageButton ID="imgEdit" CommandArgument='<%# Bind("SchedulerId")%>' CommandName="Edit"
                                                                        runat="server" ImageUrl="~/images/edit.png" />
                                                                </ItemTemplate>
                                                            </asp:TemplateField>
                                                        </Columns>
                                                    </asp:GridView>
                                                </div>
                                            </ItemTemplate>
                                            <ItemStyle Width="20px"></ItemStyle>
                                        </asp:TemplateField>
                                        <asp:BoundField DataField="Frequency" HeaderText="Frequency" />
                                        <asp:BoundField DataField="DayOfWeek" HeaderText="Day Of Week" />
                                        <asp:BoundField DataField="Time" HeaderText="Time" />
                                        <asp:BoundField DataField="NextRunOn" HeaderText="Next Run On" />
                                        <asp:TemplateField>
                                            <ItemTemplate>
                                                <asp:ImageButton ID="imgDelete" CommandArgument='<%# Bind("SchedulerId")%>' CommandName="Delete"
                                                    runat="server" ImageUrl="~/images/delete.png" />
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>

父/主gridview“ gridViewExistingSchedules”显示计划的项目，而子gridview“ gridViewSchedulerDetails”显示计划项目的详细信息（例如计划了哪些项目等）。

我想添加一个功能，其中详细的gridview中的一行（即gridViewSchedulerDetails可以删除/编辑。我有以下代码可以处理row_deleting和row_command事件：

protected void gridViewExistingSchedules_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                int schedulerId = int.Parse(this.gridViewExistingSchedules.DataKeys[e.Row.RowIndex].Value.ToString());
                GridView gvDetails = e.Row.FindControl("gridViewSchedulerDetails") as GridView;

                gvDetails.RowCommand += new GridViewCommandEventHandler(gvDetails_RowCommand);
                gvDetails.RowDeleting += new GridViewDeleteEventHandler(gvDetails_RowDeleting);

                UICaller caller = new UICaller();
                gvDetails.DataSource = caller.BindSchedulerDetails(schedulerId);
                gvDetails.DataBind();
            }
        }



void gvDetails_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            UIWriter writer = new UIWriter();
            if (e.CommandName.Equals("Delete"))
            {
                int surveyDetailId = int.Parse(e.CommandArgument.ToString());
                if (writer.RemoveSurvey(surveyDetailId))
                {
                    this.labelUserNotification.Text = "Deleted successfully";
                }
                else
                    this.labelUserNotification.Text = "Due to some internal error, selected item cannot be deleted";


                //bind existing scheduler
                UICaller caller = new UICaller();
                this.gridViewExistingSchedules.DataSource = caller.BindScheduler();
                this.gridViewExistingSchedules.DataBind();
            }
            else if (e.CommandName.Equals("Edit"))
            {
            }
        }



void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {


        }

上面给出的代码存在运行时异常：

“ GridView'gridViewSchedulerDetails'触发了未处理的事件RowDeleting。 ”

首先，我认为，由于处于父/子关系中，所以主gridview需要处理子“ gridViewSchedulerDetails”的row_command事件，因此我将代码更改为：

void gvDetails_RowCommand(object sender, GridViewCommandEventArgs e)
        {

        }

        void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {


        }



protected void gridViewExistingSchedules_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            UIWriter writer = new UIWriter();
            if (e.CommandName.Equals("Delete"))
            {
                int surveyDetailId = int.Parse(e.CommandArgument.ToString());
                if (writer.RemoveSurvey(surveyDetailId))
                {
                    this.labelUserNotification.Text = "Deleted successfully";
                }
                else
                    this.labelUserNotification.Text = "Due to some internal error, selected item cannot be deleted";


                //bind existing scheduler
                UICaller caller = new UICaller();
                this.gridViewExistingSchedules.DataSource = caller.BindScheduler();
                this.gridViewExistingSchedules.DataBind();
            }
            else if (e.CommandName.Equals("Edit"))
            {
            }
        }


protected void gridViewExistingSchedules_RowDeleting(object sender, GridViewDeleteEventArgs e)
            {

            }

但是我仍然收到上面给出的相同错误。 请告知我该如何处理子gridview行删除，以及此处实际发生的情况

Answer 1

您已在aspx代码中指定了删除事件，而.cs文件代码中没有该事件处理程序，这就是它造成问题的原因。 编写如下的事件处理程序。

void gridViewExistingSchedules_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
}

或从不需要的aspx代码中删除以下内容。

OnRowDeleting="gridViewExistingSchedules_RowDeleting"

Answer 2

几件事...

如果您指定OnRowCommand="gridViewExistingSchedules_RowCommand"那么从技术上讲，这也会捕获删除命令。 因此，您可以删除OnRowDeleting="gridViewExistingSchedules_RowDeleting"并使用打开的命令名捕获它。 （请参见http://msdn.microsoft.com/zh-cn/library/system.web.ui.webcontrols.gridview.rowcommand%28v=vs.110%29.aspx ）

顺便说一句，让我们继续错误。

GridView'gridViewSchedulerDetails'触发了未处理的事件RowDeleting。

之所以会收到此消息，是因为在gridViewSchedulerDetails的gridview gridViewSchedulerDetails上调用了delete方法。 您有2种选择可以摆脱它。

1. 将OnRowDeleting方法添加到OnRowDeleting格（ gridViewSchedulerDetails ）并进行处理。
2. 将OnRowCommand方法添加到OnRowCommand格（ gridViewSchedulerDetails ）并进行处理。

更新

只是以为您的图像按钮包含命令名称delete和edit ...这些分别保留给事件delete和edit并触发它们。 当您在数据绑定中分配不同的事件时，这可能会导致冲突。 尝试将图像按钮上的CommandName更改为子网格视图中的del和ed ，看看是否有帮助。