在内部.ascx控件和窗体视图中进行数据绑定

抱歉,如果有点晚了:-)

“绑定”是一种奇怪的野兽。任何地方都没有绑定方法。它只是一个特定的asp.net标记,指示asp.net编译器添加“eval”调用(有一个 Eval 方法),并生成用于双向绑定的特定提取代码隐藏方法。

但是,此方法仅对配备有 ITemplate 属性(如formview的itemtemplate、edititemtemplate等),并声明为双向可绑定。

不幸的是,对于用户控件(ascx),没有一种简单的方法可以生成这种方法。

但是,有 IBindableControl Interface 您可以在用户控件中实现,该控件允许一些集成,尽管它不太自动,声明性也不强,例如:

webusercontrol.ascx:

<asp:TextBox ID="txt1" runat="server" Text='<%# Eval("Name") %>' />

(注意绑定是无用的,所以你可以只使用eval)。

webusercontrol.ascx.cs:

public partial class WebUserControl : UserControl, IBindableControl
{
    public void ExtractValues(IOrderedDictionary dictionary)
    {
        dictionary["Name"] = txt1.Text;
    }
}

你必须移动 <%#绑定(“”%> 从用户控件(ASCx)到包含页(ASPx)的语法并使用 性质 在用户控件中获取和设置窗体值。下面的示例是根据 http://oudinia.blogspot.co.uk/2007/12/aspnet-20-and-up-c-user-control-within.html 再加上一些细节,让它更逼真:

ASCx加价:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="PaperForm.ascx.cs" Inherits="PaperForm" %>

<asp:ValidationSummary runat="server" HeaderText="<b>Please supply the missing information below.</b>" />

<p class="SectionHeading">Section A: Your Details</p>
<table border="1" width="100%">
  <tr>
    <td width="220px">Membership number</td>
    <td colspan="3"><asp:TextBox ID="txtMemNo" runat="server" MaxLength="9"></asp:TextBox>
        <asp:RegularExpressionValidator runat="server" ControlToValidate="txtMemNo" Display="Dynamic" Text="Please check your membership number" ValidationExpression="\d{9}"></asp:RegularExpressionValidator>
    </td>
  </tr>
  <tr>
    <td><asp:Label ID="lblFirstName" runat="server">First name</asp:Label></td>
    <td><asp:TextBox ID="txtForename" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator runat="server" ControlToValidate="txtForename" Text="Required"></asp:RequiredFieldValidator>
    </td>
    <td width="110px"><asp:Label ID="lblLastName" runat="server">Last name</asp:Label></td>
    <td><asp:TextBox ID="txtSurname" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator runat="server" ControlToValidate="txtSurname" Text="Required"></asp:RequiredFieldValidator>
    </td>
  </tr>
  ...
</table>

<script type="text/javascript" language="javascript">
  // perform additional client-side validation in JavaScript
  function ValidateForm()
  {
    // check membership number (via web-service)
    ...
  }
</script>

ASCx代码:

public partial class PaperForm : UserControl
{
    // **public properties representing form data**
    public string MemNo { get { return txtMemNo.Text; } set { txtMemNo.Text = value; } }
    public string Forename { get { return txtForename.Text; } set { txtForename.Text = value; } }
    public string Surname { get { return txtSurname.Text; } set { txtSurname.Text = value; } }
    ...

    protected void Page_Load(object sender, EventArgs e)
    {
        // prevent browser caching
        ...
    }
}

ASPX加价:

<%--register the user control here--%>
<%@ Register TagPrefix="UC" TagName="PaperForm" Src="~/Proposals/PaperForm.ascx" %>

<asp:FormView ID="fvPaper" runat="server" DataKeyNames="PprPropID" DataSourceID="tblPprProp" DefaultMode="Insert" Width="780px">    
  <InsertItemTemplate>

    <%--insert the user control here, **and bind the database fields to its properties**--%>
    <UC:PaperForm ID="pf" runat="server" MemNo='<%# Bind("MemNo") %>' Forename='<%# Bind("Forename") %>' Surname='<%# Bind("Surname") %>' ... />
    ...
    <%--can use the JavaScript ValidateForm() function defined in the ASCX file--%>
    <asp:Button ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Submit" BackColor="#C2D9EC" OnClientClick="return ValidateForm();" />
  </InsertItemTemplate>
</asp:FormView>

<%--define the data-source here rather than in the ASCX file--%>
<asp:SqlDataSource ID="tblPprProp" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:confConnectionString %>" OnInserted="AfterInsertion" 
  InsertCommand="INSERT INTO [tblPprProp] ([MemNo], [Surname], [Forename], ...) VALUES (@MemNo, @Surname, @Forename, ...); SELECT @RowID = SCOPE_IDENTITY()" 
  OldValuesParameterFormatString="original_{0}">
  <InsertParameters>
    <asp:Parameter Name="MemNo" Type="String" />
    <asp:Parameter Name="Surname" Type="String" />
    <asp:Parameter Name="Forename" Type="String" />
    ...
  </InsertParameters>
</asp:SqlDataSource>

ASPX代码隐藏:

public partial class PaperProposal : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void AfterInsertion(object sender, SqlDataSourceStatusEventArgs e)
    {
        // get Proposal ID
        string rowId = e.Command.Parameters["@RowID"].Value.ToString();
        // get e-mail address from ASCX property
        string address = ((PaperForm)this.fvPaper.FindControl("pf")).Email;
        // send acknowledgement e-mail
        ...
    }
}