对gridview中的所有行触发Dropdown_SelectedIndexchange事件

Question

我有gridview，其中每一行包含一个下拉列表。 下拉列表已选择索引更改事件。 现在，当我在网格的任何行中的下拉列表中更改值时，它将为gridview中的所有行触发选定的索引更改事件。 如何解决这个问题？

以下是HTML标记

<asp:GridView ID="gvEditFields" runat="server" 
                        AllowSorting="false" AllowPaging="false" OnRowDataBound="gvEditFields_RowDataBound" >
                        <Columns>
                            <asp:TemplateField HeaderText="Project">
                                <ItemTemplate>
                                    <asp:DropDownList ID="ddlProjectList" runat="server" Width="130px" AutoPostBack="true"  OnSelectedIndexChanged="ddlProjectList_SelectedIndexChanged"></asp:DropDownList>
                                    <asp:RequiredFieldValidator ID="rfvProjectList" runat="server" ErrorMessage="* Required"
                                        Display="Dynamic" ControlToValidate="ddlProjectList" SetFocusOnError="True" ValidationGroup="EditGridSave"
                                        Text="Required" ></asp:RequiredFieldValidator>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Task">
                                <ItemTemplate>
                                    <asp:DropDownList ID="ddlTaskList" runat="server" AppendDataBoundItems="false" Width="150px" OnSelectedIndexChanged="ddlTaskList_SelectedIndexChanged"></asp:DropDownList>
                                    <asp:RequiredFieldValidator ID="rfvTaskList" runat="server" ErrorMessage="* Required"
                                        Display="Dynamic" ControlToValidate="ddlTaskList" SetFocusOnError="True" ValidationGroup="EditGridSave"
                                        Text="Required" ></asp:RequiredFieldValidator>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Task Status">
                                <ItemTemplate>
                                    <asp:DropDownList ID="ddlTaskStatus" runat="server"  Width="100px"></asp:DropDownList>
                                    <asp:RequiredFieldValidator ID="rfvTaskStatus" runat="server" ErrorMessage="* Required"
                                        Display="Dynamic" ControlToValidate="ddlTaskStatus" SetFocusOnError="True" ValidationGroup="EditGridSave"
                                        Text="Required" ></asp:RequiredFieldValidator>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Description">
                                <ItemTemplate>
                                    <asp:TextBox ID="txtDescription" runat="server" TextMode="MultiLine" Rows="3" Columns="30" />
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Columns>
                    </asp:GridView>

这是行数据绑定和选定索引更改事件的代码。

protected void gvEditFields_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        SetEditFieldsGridRecords(e.Row);
        //DropDownList ddlProjectList = (DropDownList)e.Row.FindControl("ddlProjectList");

    }
}

protected void ddlProjectList_SelectedIndexChanged(object sender, EventArgs e)
{        
    DropDownList ddlProjectList = (DropDownList)sender;
   // GridViewRow Row = (GridViewRow)ddlProjectList.NamingContainer;
    GridViewRow selectedRow = (GridViewRow)ddlProjectList.Parent.Parent;
    int i = selectedRow.RowIndex;
    DropDownList ddlTaskList = (DropDownList)selectedRow.Cells[1].FindControl("ddlTaskList");
    DropDownList ddlTaskStatus = (DropDownList)selectedRow.Cells[2].FindControl("ddlTaskStatus");

    BindTasks(clsCheckDBNull.ToStr(ddlProjectList.SelectedValue), -1, ddlTaskList);
    BindStatus(clsCheckDBNull.ToInt(ddlTaskList.SelectedValue), "", ddlTaskStatus);

}

以下是所用方法的代码

private void BindStatus(int intTaskId, string TaskStatus, DropDownList drpStatus)
{
    DataTable dt = clsProjectTaskStatuses.SelectAll(BTMSession.AccountID);
    DataView dv = new DataView(dt);
    drpStatus.DataTextField = "str_PROJECT_TASK_STATUS_NAME";
    drpStatus.DataValueField = "int_PROJECT_TASK_STATUS_ID";
    drpStatus.DataSource = dv;
    drpStatus.DataBind();
    SiteUtility.BindTooltip(drpStatus);

    if (drpStatus.Items.Count >= 2 && TaskStatus.Trim() != "")
    {
        if (drpStatus.Items.FindByText(TaskStatus.ToString()) != null)
            drpStatus.SelectedIndex = drpStatus.Items.IndexOf(drpStatus.Items.FindByText(TaskStatus.ToString()));
    }
}

---

private void BindTasks(string ProjectNo, int intTaskid, DropDownList drpTasks)
{
    if (drpTasks.Items.Count >= 1)
        drpTasks.Items.Clear();
    DataSet ds = new DataSet();

    clsImportFileTypeDAL objImportFileTypeDAL = new clsImportFileTypeDAL();
    ds = objImportFileTypeDAL.SelectTaskListByProjectNoUserIDForTimeImport(ProjectNo, clsCheckDBNull.ToInt(BTMSession.UserId));
    CommonHelper.DisposeOf(objImportFileTypeDAL);

    if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
    {
        drpTasks.DataTextField = "str_TASK_SUMMERY";
        drpTasks.DataValueField = "int_task_id";
        drpTasks.DataSource = ds;
        drpTasks.DataBind();
    }

    drpTasks.Items.Insert(0, new ListItem("Select Task", "-1"));
    SiteUtility.BindTooltip(drpTasks);
    drpTasks.SelectedValue = "-1";

    if (drpTasks.Items.Count >= 2)
    {
        if (drpTasks.Items.FindByValue(intTaskid.ToString()) != null)
            drpTasks.SelectedIndex = drpTasks.Items.IndexOf(drpTasks.Items.FindByValue(intTaskid.ToString()));
    }
}

---

私人无效SetEditFieldsGridRecords（GridViewRow行）{DataRowView drv =（DataRowView）row.DataItem;

    DropDownList ddlProjectList = (DropDownList)row.FindControl("ddlProjectList");
    BindProjects(clsCheckDBNull.ToStr(drv["str_PROJECT_NO"]), ddlProjectList);

    DropDownList ddlTaskList = (DropDownList)row.FindControl("ddlTaskList");
    BindTasks(ddlProjectList.SelectedValue, clsCheckDBNull.ToInt(drv["int_TASK_NO"]), ddlTaskList);

    DropDownList ddlTaskStatus = (DropDownList)row.FindControl("ddlTaskStatus");
    BindStatus(clsCheckDBNull.ToInt(ddlTaskList.SelectedValue), clsCheckDBNull.ToStr(drv["TaskStatus"]), ddlTaskStatus);

    BTMWeb.Calender.Calender txtWorkDate = (BTMWeb.Calender.Calender)row.FindControl("txtWorkDate");
    DropDownList drpStartHours = (DropDownList)row.FindControl("drpStartHours");
    DropDownList drpStartMinutes = (DropDownList)row.FindControl("drpStartMinutes");
    DropDownList drpEndHours = (DropDownList)row.FindControl("drpEndHours");
    DropDownList drpEndMinutes = (DropDownList)row.FindControl("drpEndMinutes");
    TextBox txtDescription = (TextBox)row.FindControl("txtDescription");

    int StartHours = clsCheckDBNull.ToDate(drv["StartTime"]).Hour;
    int StartMinutes = clsCheckDBNull.ToDate(drv["StartTime"]).Minute;
    int EndHours = clsCheckDBNull.ToDate(drv["EndTime"]).Hour;
    int EndMinutes = clsCheckDBNull.ToDate(drv["EndTime"]).Minute;

    txtWorkDate.DateValue = clsCheckDBNull.ToDate(drv["dt_WORKDATE"]);
    drpStartHours.SelectedValue = StartHours.ToString();
    drpStartMinutes.SelectedValue = StartMinutes.ToString();
    drpEndHours.SelectedValue = EndHours.ToString();
    drpEndMinutes.SelectedValue = EndMinutes.ToString();

    txtDescription.Text = clsCheckDBNull.ToStr(drv["str_Description"]);

}

例如。 如果我有行，并且如果我更改第一行中的下拉值，则两行都将触发选定的索引更改。

Answer 1

仅一两个改进建议：

• 使用NamingContainer属性获取对GridViewRow的引用，而不是对Paret.Parent的引用，后者固有地容易出错（例如，如果您在TemplateField中使用的控件是容器控件）。

所以代替：

GridViewRow selectedRow = (GridViewRow)ddlProjectList.Parent.Parent;

这个

GridViewRow selectedRow = (GridViewRow)ddlProjectList.NamingContainer;

• 与此相关：在要查找的控件的NamingContainer上始终使用FindControl ，在这种情况下，即GridViewRow ， TableCell不实现INamingContainer 。

所以代替：

DropDownList ddlTaskList = (DropDownList)selectedRow.Cells[1].FindControl("ddlTaskList");

这个

DropDownList ddlTaskList = (DropDownList)selectedRow.FindControl("ddlTaskList");

这根本不容易出错。

旁注：不清楚为什么需要像CommonHelper.DisposeOf这样的方法。 我假设您会在BindTasks和BindStatus找到核心问题。 你可以给他们看吗？