DataGrid学习七

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　　datagrid上一例中BoundColumn 控件不是唯一可以在 DataGrid 的 Columns 集合中设置的控件。还可以指定 TemplateColumn，它使您可以完全控制列的内容。模板的内容可以是任意的；在 DataGrid 的列中可以呈现任何内容，包括服务器控件。下面的示例说明如何使用 TemplateColumn 控件将“State”列呈现为下拉列表并将“Contract”列呈现为复选框 HtmlControl。ASP.NET 数据绑定语法用于输出模板中的数据字段值。注意，有一些棘手的逻辑使下拉列表和复选框反射行中的数据状态。



<% Import Namespace="System.Data" %>
<% Import Namespace="System.Data.SqlClient" %>
<html>
<script language="C#" runat="server">
    SqlConnection myConnection;
    public Hashtable StateIndex;



    protected void Page_Load(Object Src, EventArgs E)
    {
        myConnection = new SqlConnection("user id=sa;password=;initial catalog=pubs;data source=jeff");



        if (!IsPostBack)
            BindGrid();
         StateIndex = new Hashtable();
         StateIndex["CA"] = 0;
         StateIndex["IN"] = 1;
         StateIndex["KS"] = 2;
         StateIndex["MD"] = 3;
         StateIndex["MI"] = 4;
         StateIndex["OR"] = 5;
         StateIndex["TN"] = 6;
         StateIndex["UT"] = 7;
    }



    public int GetStateIndex(String stateName)
    {
        if (StateIndex[stateName] != null)
            return (int)StateIndex[stateName];
        else
            return 0;
    }



    public void MyDataGrid_Edit(Object sender, DataGridCommandEventArgs E)
    {
        MyDataGrid.EditItemIndex = (int)E.Item.ItemIndex;
        BindGrid();
    }



    public void MyDataGrid_Cancel(Object sender, DataGridCommandEventArgs E)
    {
        MyDataGrid.EditItemIndex = -1;
        BindGrid();
    }



    public void MyDataGrid_Update(Object sender, DataGridCommandEventArgs E)
    {
        String updateCmd = "UPDATE Authors SET au_id = Id, au_lname = LName, au_fname = FName, phone = Phone, "
             + "address = Address, city = City, state = State, zip = Zip, contract = Contract where au_id = Id";
        SqlCommand myCommand = new SqlCommand(updateCmd, myConnection);
        myCommand.Parameters.Add(new SqlParameter("Id", SqlDbType.NVarChar, 11));
        myCommand.Parameters.Add(new SqlParameter("LName", SqlDbType.NVarChar, 40));
        myCommand.Parameters.Add(new SqlParameter("FName", SqlDbType.NVarChar, 20));
        myCommand.Parameters.Add(new SqlParameter("Phone", SqlDbType.NChar, 12));
        myCommand.Parameters.Add(new SqlParameter("Address", SqlDbType.NVarChar, 40));
        myCommand.Parameters.Add(new SqlParameter("City", SqlDbType.NVarChar, 20));
        myCommand.Parameters.Add(new SqlParameter("State", SqlDbType.NChar, 2));
        myCommand.Parameters.Add(new SqlParameter("Zip", SqlDbType.NChar, 5));
        myCommand.Parameters.Add(new SqlParameter("Contract", SqlDbType.NVarChar,1));
        myCommand.Parameters["Id"].Value = MyDataGrid.DataKeys[(int)E.Item.ItemIndex];
        String[] cols = {"LName","FName","Phone","Address","City","Zip"};
        for (int i=0; i<6; i++)
        {
            String colvalue = ((TextBox)E.Item.FindControl("edit_" + cols[i])).Text;
            // 检查在所需字段中是否有空值
            if (i<3 && colvalue == "")
            {
                Message.InnerHtml = "错误：“姓名”或“电话”不允许使用空值";
                Message.Style["color"] = "red";
                return;
            }
            myCommand.Parameters["" + cols[i]].Value = colvalue;
        }



        myCommand.Parameters["State"].Value = ((DropDownList)E.Item.FindControl("edit_State")).SelectedItem.ToString();



        if (((CheckBox)E.Item.FindControl("edit_Contract")).Checked == true)
            myCommand.Parameters["Contract"].Value = "1";
        else
            myCommand.Parameters["Contract"].Value = "0";
        myCommand.Connection.Open();
        try
        {
            myCommand.ExecuteNonQuery();
            Message.InnerHtml = "<b>已更新记录</b>
" + updateCmd;
            MyDataGrid.EditItemIndex = -1;
        }
        catch (SqlException e)
        {
            if (e.Number == 2627)
                Message.InnerHtml = "错误：已存在具有相同主键的记录";
            else
                Message.InnerHtml = "错误：未能更新记录，请确保正确填写了字段";
            Message.Style["color"] = "red";
        }
        myCommand.Connection.Close();
        BindGrid();
    }



    public void BindGrid()
    {
        SqlDataAdapter myCommand = new SqlDataAdapter("select * from Authors", myConnection);
        DataSet ds = new DataSet();
        myCommand.Fill(ds, "Authors");
        MyDataGrid.DataSource=ds.Tables["Authors"].DefaultView;
        MyDataGrid.DataBind();
    }



</script>



<body 10.5pt 宋体">
  <form runat="server">
    <h3><font face="宋体">更新具有模板列的数据行</font></h3>
    <span id="Message" EnableViewState="false" arial 11pt;" runat="server"/><p>
    <ASP:DataGrid id="MyDataGrid" runat="server"
      Width="800"
      BackColor="#ccccff"
      BorderColor="black"
      ShowFooter="false"
      CellPadding=3
      CellSpacing="0"
      Font-Name="Verdana"
      Font-Size="8pt"
      HeaderStyle-BackColor="#aaaadd"
      OnEditCommand="MyDataGrid_Edit"
      OnCancelCommand="MyDataGrid_Cancel"
      OnUpdateCommand="MyDataGrid_Update"
      DataKeyField="au_id"
      AutoGenerateColumns="false"
    >



      <Columns>
        <asp:EditCommandColumn EditText="编辑" CancelText="取消" UpdateText="更新"  ItemStyle-Wrap="false"/>
        <asp:BoundColumn HeaderText="au_id" SortExpression="au_id" ReadOnly="True" DataField="au_id" ItemStyle-Wrap="false"/>
        <asp:TemplateColumn HeaderText="au_lname" SortExpression="au_lname">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "au_lname") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_LName" Text="<%# DataBinder.Eval(Container.DataItem, "au_lname") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="au_fname" SortExpression="au_fname">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "au_fname") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_FName" Text="<%# DataBinder.Eval(Container.DataItem, "au_fname") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="phone" SortExpression="phone">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "phone") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_Phone" Text="<%# DataBinder.Eval(Container.DataItem, "phone") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="address" SortExpression="address">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "address") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_Address" Text="<%# DataBinder.Eval(Container.DataItem, "address") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="city" SortExpression="city">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "city") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_City" Text="<%# DataBinder.Eval(Container.DataItem, "city") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="state" SortExpression="state">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "state") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:DropDownList runat="server" SelectedIndex="<%# GetStateIndex(DataBinder.Eval(Container.DataItem, "state").ToString()) %>" id="edit_State">
                  <asp:ListItem>CA</asp:ListItem>
                  <asp:ListItem>IN</asp:ListItem>
                  <asp:ListItem>KS</asp:ListItem>
                  <asp:ListItem>MD</asp:ListItem>
                  <asp:ListItem>MI</asp:ListItem>
                  <asp:ListItem>OR</asp:ListItem>
                  <asp:ListItem>TN</asp:ListItem>
                  <asp:ListItem>UT</asp:ListItem>
            </asp:DropDownList>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="zip" SortExpression="zip">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "zip") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:TextBox runat="server" id="edit_Zip" Text="<%# DataBinder.Eval(Container.DataItem, "zip") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
        <asp:TemplateColumn HeaderText="contract" SortExpression="contract">
          <ItemTemplate>
            <asp:Label runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "contract", "{0}") %>"/>
          </ItemTemplate>
          <EditItemTemplate>
            <asp:CheckBox runat="server" id="edit_Contract" Checked="<%# DataBinder.Eval(Container.DataItem, "contract") %>"/>
          </EditItemTemplate>
        </asp:TemplateColumn>
      </Columns>
    </ASP:DataGrid>
  </form>
</body>
</html>

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