從sql數據源獲取數據到asp.net控件

Question

我有一個sqldatasource，它有一個非常簡單的select語句，應該總是返回一行。我在我想用數據源中的數據填充的頁面上有文本框。我怎麼能這樣做文本框？如果數據庫中沒有數據，那麼我希望文本框保持空白。我怎樣才能做到這一點？

<asp:Panel ID = "Panel2" runat="server" DefaultButton = "save" > 
         <fieldset style="width: 524px"><legend>Rouse InterChange Details</legend> 
         <asp:FormView runat="server" ID="MyFormView" DataSourceID="SqlDataSource3" DefaultMode="Edit"> 
         <ItemTemplate > 
         <table> 
          <tr> 
           <td align="right">Interchange ID:</td> 
           <td align="left"> 
            <asp:TextBox ID="txtIntID" runat="server" size="1" MaxLength = "2" Text='<%# Bind("Interchange_Id") %>'></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator8" ValidationGroup = "rouse" Display ="None" ControlToValidate = "txtIntID" runat="server" ErrorMessage="You Must Provide an Interchange ID."> </asp:RequiredFieldValidator> 
              <ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender11" TargetControlID="RequiredFieldValidator8" HighlightCssClass="validatorCalloutHighlight" runat="server"> 
              </ajaxToolkit:ValidatorCalloutExtender> 
           </td> 
          </tr> 
          <tr> 
           <td align="right">Sender ID:</td> 
           <td align="left"> 
            <asp:TextBox ID="txtsender" runat="server" MaxLength = "15" ></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator9" ValidationGroup = "rouse" Display ="None" ControlToValidate = "txtsender" runat="server" ErrorMessage="You Must Provide a Sender ID."> </asp:RequiredFieldValidator> 
            <ajaxToolkit:ValidatorCalloutExtender ID="vce12" TargetControlID="RequiredFieldValidator9" HighlightCssClass="validatorCalloutHighlight" runat="server"> 
            </ajaxToolkit:ValidatorCalloutExtender> 
           </td> 
          </tr> 
          <tr> 
           <td align="right">Interchange Standard ID:</td> 
           <td align="left"> 
            <asp:TextBox ID="ISI" runat="server" size="1" MaxLength = "1" ></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator10" ValidationGroup = "rouse" Display ="None" ControlToValidate = "ISI" runat="server" ErrorMessage="You Must Provide an Interchange Standard ID."> </asp:RequiredFieldValidator> 
            <ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender12" TargetControlID="RequiredFieldValidator10" HighlightCssClass="validatorCalloutHighlight" runat="server"> 
            </ajaxToolkit:ValidatorCalloutExtender> 
           </td> 
          </tr> 
          <tr> 
           <td align="right">Version:</td> 
           <td align="left"> 
            <asp:TextBox ID="Verstxt" runat="server" size="5" MaxLength = "5" ></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator11" ValidationGroup = "rouse" Display ="None" ControlToValidate = "Verstxt" runat="server" ErrorMessage="You Must Provide a Version."> </asp:RequiredFieldValidator> 
            <ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender13" TargetControlID="RequiredFieldValidator11" HighlightCssClass="validatorCalloutHighlight" runat="server"> 
            </ajaxToolkit:ValidatorCalloutExtender> 
           </td> 
          </tr> 
          <tr> 
           <td align="right">Functional ID:</td> 
           <td align="left"> 
            <asp:TextBox ID="FuncID" runat="server" size="1" MaxLength = "2" ></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator12" ValidationGroup = "rouse" Display ="None" ControlToValidate = "FuncID" runat="server" ErrorMessage="You Must Provide a Functional ID."> </asp:RequiredFieldValidator> 
            <ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender14" TargetControlID="RequiredFieldValidator12" HighlightCssClass="validatorCalloutHighlight" runat="server"> 
            </ajaxToolkit:ValidatorCalloutExtender> 
           </td> 
          </tr> 
          <tr style="display:none"> 
           <td align="right">Group Control #</td> 
           <td align="left"> 
            <asp:TextBox ID="txtGroupcontrol" runat="server" size="6" MaxLength = "9" ></asp:TextBox> 

           </td> 
          </tr> 
         </table> 
         </ItemTemplate> 
         </asp:FormView> 
         <asp:SqlDataSource ID="SqlDataSource3" runat="server" 
         ConnectionString="connectionstring" 
         SelectCommand="select * from table1 "></asp:SqlDataSource> 
         </fieldset></asp:Panel> 

Answer 1

你應該考慮使用FormView控件來做到這一點。使用綁定控件比將所有代碼塞進頁面的代碼隱藏更簡單，更簡潔。我也覺得它使頁面更容易維護，因爲你還沒有管理所有的C＃/ VB代碼。

<asp:FormView runat="server" ID="MyFormView" DataSourceID="MySqlDataSource" DefaultMode="Edit"> 
    <EditItemTemplate> 
     <table> 
      <tr> 
       <td align="right">Interchange ID:</td> 
       <td align="left"> 
        <asp:TextBox ID="txtIntID" runat="server" Text='<%# Bind("InterchangeID") %>' size="1" MaxLength = "2"></asp:TextBox> 
        <asp:RequiredFieldValidator ID="RequiredFieldValidator8" ValidationGroup = "rouse" Display ="None" ControlToValidate = "txtIntID" runat="server" ErrorMessage="You Must Provide an Interchange ID."></asp:RequiredFieldValidator> 
        <ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender11" TargetControlID="RequiredFieldValidator8" HighlightCssClass="validatorCalloutHighlight" runat="server">            </ajaxToolkit:ValidatorCalloutExtender> 
       </td> 
      </tr> 

     <!-- rest of your table here --> 
     </table> 
    </EditItemTemplate> 
</asp:FormView> 
<asp:SqlDataSource runat="server" ID="MySqlDataSource" 
    SelectCommand="SELECT * FROM MyTable" ConnectionString="<%$ ConnectionStrings:MyConnectionString %>" > 
</asp:SqlDataSource> 

請參見以下鏈接瞭解更多信息：

• http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.formview.aspx
• http://quickstarts.asp.net/QuickStartv20/aspnet/doc/ctrlref/data/formview.aspx

Answer 2

最簡單的方法（即我認爲要做到這一點），是寫在代碼隱藏所有的數據訪問和形式的人口。不過，我有點困惑，你把它標記爲C＃和VB.net。我將稍後用一些C＃示例代碼更新這篇文章;在此期間隨時開始評論 - 垃圾問題。 :)

Answer 3

我喜歡在代碼中使用此背後：

GridView1.DataSource = getQuery(ConnectionString, "select * from mytable"); 
GridView1.DataBind(); 

private DataTable getQuery(string ConnStr, string query) 
    { 
     DataTable dt = new DataTable(); 

     try 
     { 
      using (SqlConnection conn = new SqlConnection(ConnStr)) 
      using (SqlDataAdapter cmd = new SqlDataAdapter(query, conn)) 


       cmd.Fill(dt); 
     } 
     catch { } 
     return dt; 
    } 

當然不是所有的細節都在這裏

Answer 4

我一直在C＃中這樣做，而不是從控件本身的「默認」加載數據。這樣我就知道當我的網頁加載時，我控制數據加載，而不是ASP！下面我的方法也很好的避免了生成連接器，數據集和其他控件，例如從一個表中獲取一行數據。

   SqlDataSource sdsClogdetails = (SqlDataSource)gvRow.FindControl("sdsCLdetails"); 
       if (sdsClogdetails != null) 
       { 
        DataView dv = sdsClogdetails.Select(DataSourceSelectArguments.Empty) as DataView; 
        if (dv != null) 
        { 
         DataTable dt = dv.ToTable() as DataTable; 
         if (dt != null) 
         { 
          DataRow dr = (DataRow)dt.Rows[0]; 
          txtCLOG.Text = dr.ItemArray[3].ToString(); 
         } 
        } 
       } 

在我的例子

因此，ASP控制我想要將數據放置到被稱爲txtCLOG，這是一個TextBox控制。顯然，數據在數據集3的單元格內。因此，如果您的數據源返回10列數據，那麼我的示例會將第三列的數據引入到文本框控件中。

使用上面的代碼或類似的命令，我可以用一塊石頭打出許多鳥，而且我也不必管理處理內存中的控件。當然，更好的方法是使用USING聲明。