如何检查GridView字段内的某些复选框后更新GridView？

Question

我正在开发一个使用ASP.NET的Intranet Web应用程序。现在，我需要为我的部门开发培训记录。该部门由四个小组组成。为此，我开发了这个记录如下：我使用了一个Repeator，并在里面放置了GridView，因为我有三种不同类型的培训课程。我使用HiddenField来确定每个培训课程类型的ID。为了从数据库中检索数据，我使用了StoredProcedure。一切工作正常，很好，经过这么长的任务。

现在，我需要设置这些GridViews更新由管理员。因此，由于我在每个GridView中都有很多员工和很多课程，所以我认为最好的 更新GridView的方式是将空白字段显示为复选框，并且管理员想要更新其中一个记录的时间为 员工，他所需要做的只是检查复选框并单击更新按钮。 我可以 能够显示空字段作为复选框，但现在我不知道如何 张贴检查复选框到数据库的值。

，我寻找它是使系统检查每个 复选框中的每个GridView控件，如果已经检查之前，离开它，因为它是 的情景。如果它是空的并且现在只检查它，则应将其添加到员工记录中的 数据库中。

<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1"> 
      <ItemTemplate> 

       <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("GroupID")%>' /> 

       <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
            SelectCommandType="StoredProcedure" SelectCommand="kbiReport"> 
            <%--FilterExpression="[Division] like '{0}%' and [Organization] like '{1}%'">--%> 

        <%--<FilterParameters> 
         <asp:ControlParameter ControlID="ddlDivision" Name="Division" 
               PropertyName="SelectedValue" Type="String" /> 
         <asp:ControlParameter ControlID="ddlOrganization" Name="Organization" 
               PropertyName="SelectedValue" Type="String" /> 
        </FilterParameters>--%> 

        <SelectParameters> 
         <%--ControlParameter is linked to the HiddenField above to generate different GridView based on different values 
          of GroupID--%> 
         <asp:ControlParameter ControlID="HiddenField1" Name="GroupID" PropertyName="Value" /> 
        </SelectParameters> 
       </asp:SqlDataSource> 

       <asp:GridView ID="GridView1" runat="server" 
           AllowSorting="True" 
           CellPadding="3" 
           DataSourceID="SqlDataSource1" 
           CssClass="mGrid" 
           AlternatingRowStyle-CssClass="alt" 
           RowStyle-HorizontalAlign="Center" 
           OnRowDataBound="GridView1_RowDataBound" OnDataBound="GridView1_DataBound"> 
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> 
        <HeaderStyle Font-Bold = "true" ForeColor="Black"/> 
        <Columns> 
         <asp:CommandField ShowSelectButton="True" /> 

         <%--<asp:TemplateField HeaderText="Select"> 
         <ItemTemplate> 
         <asp:CheckBox ID="chkSelect" runat="server" AutoPostBack="true" OnCheckedChanged="chkSelect_CheckedChanged"/> 
         </ItemTemplate> 
         </asp:TemplateField>--%> 
        </Columns> 
        <EditRowStyle BackColor="#999999" /> 
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> 
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> 
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> 
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /> 
        <SortedAscendingCellStyle BackColor="#E9E7E2" /> 
        <SortedAscendingHeaderStyle BackColor="#506C8C" /> 
        <SortedDescendingCellStyle BackColor="#FFFDF8" /> 
        <SortedDescendingHeaderStyle BackColor="#6F8DAE" /> 
       </asp:GridView> 

      </ItemTemplate> 
     </asp:Repeater> 

     <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
          ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
          SelectCommand="SELECT DISTINCT GroupID FROM courses"> 
     </asp:SqlDataSource> 

     <asp:Button ID="btnSave" runat="server" OnClick="btnSave_Click" Text="Save" /> 
     <br /><br /> 

隐藏代码：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) 
    { 
     if (e.Row.RowType == DataControlRowType.DataRow) 
     { 
      foreach (TableCell c in e.Row.Cells) 
      { 
       // Check if the cell vlaue = Yes 
       // if it is Yes, the cell will be colored with Light Green 
       if (c.Text.Equals("Yes")) 
       { 
        c.BackColor = System.Drawing.Color.LightGreen; 
       } 
      }  
     } 

     // The following is for changing the color of headers in each GridView based on the value of the HiddenFild 
     // BTW, the value of the HiddenField is the value of the GroupID in Group Table in the Database 
     else if(e.Row.RowType == DataControlRowType.Header){ 
      switch (((HiddenField)((GridView)sender).Parent.FindControl("HiddenField1")).Value) 
      { 
       case "1": 
        for (int i = 5; i < e.Row.Cells.Count; i++) 
         e.Row.Cells[i].BackColor = System.Drawing.Color.LightBlue; 
        break; 

       case "2": 
        for (int i = 5; i < e.Row.Cells.Count; i++) 
         e.Row.Cells[i].BackColor = System.Drawing.Color.LightYellow; 
        break; 

       case "3": 
        for (int i = 5; i < e.Row.Cells.Count; i++) 
         e.Row.Cells[i].BackColor = System.Drawing.Color.Orange; 
        break; 
      } 
     }} 


     //For inserting checkboxes inside all courses buttons 
     protected void GridView1_DataBound(object sender, EventArgs e){ 
      GridView GridView1 = (GridView)sender; 
      foreach (GridViewRow objRow in GridView1.Rows) 
      { 
       for (int i = 5; i < objRow.Cells.Count; i++){ 
        CheckBox chkCheckBox = new CheckBox(); 
        objRow.Cells[i].Controls.Add(chkCheckBox); 
        if (objRow.Cells[i].BackColor == System.Drawing.Color.LightGreen) 
         chkCheckBox.Checked = true; 
       } 

      } 
     } 


     //For updating the GridView (Save Button) 
     protected void btnSave_Click(object sender, EventArgs e) 
     { 

     } 

UPDATE： 我修改了btnSave_Click按钮是如下：

//For updating the GridView (Save Button) 
     protected void btnSave_Click(object sender, EventArgs e) 
     { 
      GridView GridView1 = (GridView)sender; 
      // Are there checked boxes? 
      List<int> CheckBoxList = new List<int>(); 
      for (int i = 0; i < GridView1.Rows.Count; i++) 
      { 
       int courseid = (int)GridView1.DataKeys[i][0]; 
       CheckBox checkBox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox"); 
       if (checkBox.Checked) 
       { 
        CheckBoxList.Add(courseid); 
       } 
      } 
     } 

但我得到了以下错误： Sys系统.WebForms.PageRequestManagerServerErrorException：无法转换类型为“System.Web.UI.WebControls.Button”的对象以键入“System.Web .UI.WebControls.GridView'

我不知道为什么我得到这个错误。任何人都可以帮助我吗？

Answer 1

您将需要更改为您所需要的工作，但如果你想检查是否有GridView控件检查尝试的项目是：

List<int> CheckBoxList = new List<int>(); 
for (int i = 0; i < GridView.Rows.Count; i++) 
{ 
    int yourColumnId = (int)GridView.DataKeys[i][0]; 
    CheckBox cb = (CheckBox)GridView.Rows[i].FindControl("The name of your CheckBox"); 
    if (cb.Checked) 
    { 
     CheckBoxList.Add(productId); 
    } 
} 
// Do something with CheckBoxList