Question

我正在开发一个aspx网站，该网站允许管理员级用户填写包含潜在会员数据的表单。填写完表单后，用户将单击“提交”，数据将转到不同的表。填写表格的一部分涉及填写三个文本框（txtFirstName，txtLastName，txtGrade）。我有一个按钮（btnAddStudent），当点击它时，应该将文本框中的信息添加到类似于表格的显示区域。我正在尝试使用gridview，但没有什么可以绑定它。没有memberID号从Student表加载空白记录（这是与Member表的多对一关系）。成员记录是此表单创建的内容，当单击“提交”按钮时，学生数据将添加到学生表中。

我目前正在处理回复 here中的代码。但是，当我单击“添加学生”按钮时，我得到一个新的空行，但我的文本框值未在gridview中输入。

这可以，或者我是否需要查看使用表格并动态添加文本框行？

以下是相关的源代码：

<tr>    
   <td class="style8">
    <asp:Label ID="Label18" runat="server" Text="Chidren:" Font-Bold="True" Font-                     Underline="True" Font-Names="Tahoma"></asp:Label>
  </td>
</tr>
<tr>
  <td class="style8">
    <asp:Label ID="Label19" runat="server" Text="First Name:"></asp:Label>
  </td>
  <td class="style7">
    <asp:TextBox ID="txtChildFirstName" runat="server" CssClass="textbox"></asp:TextBox>
  </td>
  <td class="">
    <asp:Label ID="Label20" runat="server" Text="Last Name:"></asp:Label>
  </td>
  <td class="style6">
    <asp:TextBox ID="txtChildLastName" runat="server" CssClass="textbox"></asp:TextBox>
   </td>
   <td class="style5" align="right">
     <asp:Label ID="Label21" runat="server" Text="Grade:"></asp:Label>
   </td>
   <td class="style4">
     <asp:TextBox ID="txtGrade" runat="server" Width="52px" CssClass="textbox"></asp:TextBox>
   </td>
   <td>
     <asp:Button ID="btnAddChild" runat="server" Text="Add Child" OnClick="btnAddChild_Click" />
   </td>
</tr>
<tr>
   <td valign="top" class="style8">
     <asp:Label ID="Label22" runat="server" Text="Student List:"></asp:Label>
   </td>
   <td colspan="3">
     <asp:UpdatePanel ID="UpdatePanel1" runat="server">
       <ContentTemplate>
         <asp:GridView ID="gvStudentList" runat="server" AutoGenerateColumns="False" 
                                            PageSize="5" Height="42px">
                                            <AlternatingRowStyle BackColor="#E0E0E0" />
            <Columns>
               <asp:BoundField AccessibleHeaderText="FirstName" HeaderText="First Name" />
               <asp:BoundField AccessibleHeaderText="LastName" HeaderText="Last Name" />
               <asp:BoundField AccessibleHeaderText="Grade" HeaderText="Grade" />
            </Columns>
          <HeaderStyle BackColor="#CCCCCC" Height="25px" />
          <RowStyle Height="22px" />
         </asp:GridView>
       </ContentTemplate>
     </asp:UpdatePanel>

守则背后： '一种基于TextBox绑定GridView的方法 '价值并保留其在邮寄上的价值。

Private Sub BindGrid(rowcount As Integer)
    Dim dt As New DataTable()
    Dim dr As DataRow
    dt.Columns.Add(New System.Data.DataColumn("FirstName", GetType([String])))
    dt.Columns.Add(New System.Data.DataColumn("LastName", GetType([String])))
    dt.Columns.Add(New System.Data.DataColumn("Grade", GetType([String])))

    If ViewState("CurrentData") IsNot Nothing Then
        For i As Integer = 0 To rowcount
            dt = DirectCast(ViewState("CurrentData"), DataTable)
            If dt.Rows.Count > 0 Then
                dr = dt.NewRow()

                dr(0) = dt.Rows(0)(0).ToString()
            End If
        Next
        dr = dt.NewRow()
        dr(0) = txtChildFirstName.Text
        dr(1) = txtChildLastName.Text
        dr(2) = txtGrade.Text

        dt.Rows.Add(dr)
    Else
        dr = dt.NewRow()
        dr(0) = txtChildFirstName.Text
        dr(1) = txtChildLastName.Text
        dr(2) = txtGrade.Text


        dt.Rows.Add(dr)
    End If

    ' If ViewState has a data then use the value as the DataSource 
    If ViewState("CurrentData") IsNot Nothing Then
        gvStudentList.DataSource = DirectCast(ViewState("CurrentData"), DataTable)
        gvStudentList.DataBind()
    Else
        ' Bind GridView with the initial data assocaited in the DataTable 
        gvStudentList.DataSource = dt

        gvStudentList.DataBind()
    End If
    ' Store the DataTable in ViewState to retain the values 
    ViewState("CurrentData") = dt

End Sub

Protected Sub btnAddChild_Click(sender As Object, e As EventArgs) Handles btnAddChild.Click
    ' Check if the ViewState has a data assoiciated within it. If 
    If ViewState("CurrentData") IsNot Nothing Then
        Dim dt As DataTable = DirectCast(ViewState("CurrentData"), DataTable)
        Dim count As Integer = dt.Rows.Count
        BindGrid(count)
    Else
        BindGrid(1)
    End If
    txtChildFirstName.Text = String.Empty
    txtChildLastName.Text = String.Empty
    txtGrade.Text = String.Empty

    txtChildFirstName.Focus()
End Sub

在Page_Load事件中调用“BindGrid（）”。（是的，我有ScriptManager）

Answer 1

尝试使用

 Session("CurrentData") = dt on your BindGrid()

然后在回发后创建只刷新网格的方法：

 Private Sub RefreshGrid()
 {
 If ViewState("CurrentData") IsNot Nothing Then
 gvStudentList.DataSource = DirectCast(Session("CurrentData"), DataTable)
 gvStudentList.DataBind()
 Else
 gvStudentList.DataSource = null;
 gvStudentList.DataBind()
 EndIf
 }

在您的页面加载时，只需致电：

  If IsPostBack Then
            Return
     End If
     RefreshGrid()

此致

在按钮单击时，从文本框向gridview添加数据

1 个答案: