ControlParameter.ControlID 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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指定 ControlParameter 对象绑定到的控件名称。

public:
 property System::String ^ ControlID { System::String ^ get(); void set(System::String ^ value); };

[System.ComponentModel.TypeConverter(typeof(System.Web.UI.WebControls.ControlIDConverter))]
public string ControlID { get; set; }

[<System.ComponentModel.TypeConverter(typeof(System.Web.UI.WebControls.ControlIDConverter))>]
member this.ControlID : string with get, set

Public Property ControlID As String

属性值

String

表示 Web 服务器控件名称的 string。

属性: TypeConverterAttribute

示例

下面的代码示例演示如何使用 ControlParameter 对象将控件中显示的 ListBox 数据绑定到声明性方案中控件的 DropDownList 选定值。对象ControlParameter将添加到SelectParameters窗体上控件的SqlDataSource集合中，并对应于属性中的SelectCommand“@Title”占位符文本。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <p><asp:dropdownlist
          id="DropDownList1"
          runat="server"
          autopostback="True">
          <asp:listitem selected="True">Sales Representative</asp:listitem>
          <asp:listitem>Sales Manager</asp:listitem>
          <asp:listitem>Vice President, Sales</asp:listitem>
      </asp:dropdownlist></p>

      <asp:sqldatasource
          id="SqlDataSource1"
          runat="server"
          connectionstring="<%$ ConnectionStrings:MyNorthwind%>"
          selectcommand="SELECT LastName FROM Employees WHERE Title = @Title">
          <selectparameters>
              <asp:controlparameter name="Title" controlid="DropDownList1" propertyname="SelectedValue"/>
          </selectparameters>
      </asp:sqldatasource>

      <p><asp:listbox
          id="ListBox1"
          runat="server"
          datasourceid="SqlDataSource1"
          datatextfield="LastName">
      </asp:listbox></p>

    </form>
  </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <p><asp:dropdownlist
          id="DropDownList1"
          runat="server"
          autopostback="True">
          <asp:listitem selected="True">Sales Representative</asp:listitem>
          <asp:listitem>Sales Manager</asp:listitem>
          <asp:listitem>Vice President, Sales</asp:listitem>
      </asp:dropdownlist></p>

      <asp:sqldatasource
          id="SqlDataSource1"
          runat="server"
          connectionstring="<%$ ConnectionStrings:MyNorthwind%>"
          selectcommand="SELECT LastName FROM Employees WHERE Title = @Title">
          <selectparameters>
              <asp:controlparameter name="Title" controlid="DropDownList1" propertyname="SelectedValue"/>
          </selectparameters>
      </asp:sqldatasource>

      <p><asp:listbox
          id="ListBox1"
          runat="server"
          datasourceid="SqlDataSource1"
          datatextfield="LastName">
      </asp:listbox></p>

    </form>
  </body>
</html>

下面的代码示例演示如何设置 ControlID 和 PropertyName 属性以标识对象绑定到的控件 ControlParameter 。该示例使用 ListBox 值填充控件。控件 SelectedValue 的属性 ListBox 用于筛选控件检索 SqlDataSource 的数据，并由控件显示 GridView 。

<%@ Page language="c#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
  if (IsPostBack) {
    GridView1.DataBind();
  }
  else {
    ListBox1.Items.Add(new ListItem("Nancy Davolio",   "1",true));
    ListBox1.Items.Add(new ListItem("Janet Leverling", "3",true));
    ListBox1.Items.Add(new ListItem("Margaret Peacock","4",true));
    ListBox1.Items.Add(new ListItem("Michael Suyama",  "6",true));
    ListBox1.Items.Add(new ListItem("Robert King",     "7",true));
    ListBox1.Items.Add(new ListItem("Anne Dodsworth",  "9",true));
  }
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="Form1" method="post" runat="server">
      <p>Show Orders For:</p>

      <p>
      <asp:ListBox
        id="ListBox1"
        runat="server"
        AutoPostBack="True">
      </asp:ListBox></p>

      <asp:SqlDataSource
        id="OdbcDataSource1"
        runat="server"
        ProviderName="System.Data.Odbc"
        DataSourceMode="DataSet"
        SelectCommand="SELECT OrderID, ShipName FROM Orders WHERE EmployeeID = ?;"
        ConnectionString="dsn=MyOdbcDSN;">
        <SELECTPARAMETERS>
          <asp:ControlParameter
            PropertyName="SelectedValue"
            ControlID="ListBox1"
            Name="empID">
          </asp:ControlParameter>
        </SELECTPARAMETERS>
      </asp:SqlDataSource>

      <p>
      <asp:GridView
        id="GridView1"
        runat="server"
        DataSourceID="OdbcDataSource1">
      </asp:GridView></p>
    </form>
  </body>
</html>

<%@ Page language="VB"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
Private Sub Page_Load(sender As Object, e As EventArgs)

    If (IsPostBack) Then
        GridView1.DataBind()
    Else
      Dim li As ListItem

      li = New ListItem("Nancy Davolio",   "1",True)
      ListBox1.Items.Add(li)

      li = New ListItem("Janet Leverling", "3",True)
      ListBox1.Items.Add(li)

      li = New ListItem("Margaret Peacock","4",True)
      ListBox1.Items.Add(li)

      li = New ListItem("Michael Suyama",  "6",True)
      ListBox1.Items.Add(li)

      li = New ListItem("Robert King",     "7",True)
      ListBox1.Items.Add(li)

      li = New ListItem("Anne Dodsworth",  "9",True)
      ListBox1.Items.Add(li)
    End If
End Sub ' Page_Load
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="Form1" method="post" runat="server">
      <p>Show Orders For:</p>

      <p>
      <asp:ListBox
        id="ListBox1"
        runat="server"
        AutoPostBack="True">
      </asp:ListBox></p>

      <asp:SqlDataSource
        id="OdbcDataSource1"
        runat="server"
        ProviderName="System.Data.Odbc"
        DataSourceMode="DataSet"
        SelectCommand="SELECT OrderID, ShipName FROM Orders WHERE EmployeeID = ?;"
        ConnectionString="dsn=MyOdbcDSN;">
        <SELECTPARAMETERS>
          <asp:ControlParameter
            PropertyName="SelectedValue"
            ControlID="ListBox1"
            Name="empID">
          </asp:ControlParameter>
        </SELECTPARAMETERS>
      </asp:SqlDataSource>

      <p>
      <asp:GridView
        id="GridView1"
        runat="server"
        DataSourceID="OdbcDataSource1">
      </asp:GridView></p>
    </form>
  </body>
</html>

注解

该 ControlID 属性是一个必需属性，用于标识 Control 对象在运行时绑定到的 ControlParameter 实例。

通常，ControlID为方法设置Evaluate属性PropertyName以正确绑定到控件。如果未设置 ControlID 该属性，该方法 Evaluate 会在调用时引发异常 ArgumentException 。

适用于

另请参阅

PropertyName

通过

ControlParameter.ControlID 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源