ParameterCollection.Remove(Parameter) 方法

定义

Parameter 集合中移除指定的 ParameterCollection 对象。

public:
 void Remove(System::Web::UI::WebControls::Parameter ^ parameter);
public void Remove (System.Web.UI.WebControls.Parameter parameter);
member this.Remove : System.Web.UI.WebControls.Parameter -> unit
Public Sub Remove (parameter As Parameter)

参数

parameter
Parameter

要从 Parameter 移除的 ParameterCollection

示例

下面的代码示例演示如何使用Remove方法和Item[]索引器从ParameterCollection集合中删除Parameter对象。 在此示例中,将多个 QueryStringParameter 对象添加到 SelectParameters 集合中,从集合中删除一个 QueryStringParameter 对象,并在页面加载时打印集合的顺序。

<%@page Language="C#" %>
<SCRIPT runat="server">
private void Page_Load(object sender, EventArgs e) {

    SqlDataSource aSqlDataSource = new SqlDataSource();

    // Security Note: The SqlDataSource uses a QueryStringParameter,
    // Security Note: which does not perform validation of input from the client.

    QueryStringParameter qs1 =
        new QueryStringParameter("QueryStringParam1","requestfield1");
    aSqlDataSource.SelectParameters.Add(qs1);

    QueryStringParameter qs2 =
        new QueryStringParameter("QueryStringParam2","requestfield2");
    aSqlDataSource.SelectParameters.Add(qs2);

    QueryStringParameter qs3 =
        new QueryStringParameter("QueryStringParam3","requestfield3");
    aSqlDataSource.SelectParameters.Add(qs3);

    // Remove the QueryStringParameter named QueryStringParameter2
    // using the Remove method and the ParameterCollection indexer
    // property.
    aSqlDataSource.SelectParameters.Remove( aSqlDataSource.SelectParameters["QueryStringParam2"] );

    // Iterate through the ParameterCollection and print out the
    // names of the Parameters contained by it.
    foreach (Parameter aParameter in aSqlDataSource.SelectParameters) {
        Response.Write(aParameter.Name + "<BR>");
    }
}
</SCRIPT>
<%@page Language="VB" %>
<SCRIPT runat="server">
Sub Page_Load(sender As Object, e As EventArgs)

    Dim aSqlDataSource As New SqlDataSource()

    ' Security Note: The SqlDataSource uses a QueryStringParameter,
    ' Security Note: which does not perform validation of input from the client.

    Dim qs1 As New QueryStringParameter("QueryStringParam1","requestfield1")
    aSqlDataSource.SelectParameters.Add(qs1)

    Dim qs2 As New QueryStringParameter("QueryStringParam2","requestfield2")
    aSqlDataSource.SelectParameters.Add(qs2)

    Dim qs3 As New QueryStringParameter("QueryStringParam3","requestfield3")
    aSqlDataSource.SelectParameters.Add(qs3)

    ' Remove the QueryStringParameter named QueryStringParameter2
    ' using the Remove method and the ParameterCollection indexer
    ' property.
    aSqlDataSource.SelectParameters.Remove( aSqlDataSource.SelectParameters("QueryStringParam2") )

    ' Iterate through the ParameterCollection and print out the
    ' names of the Parameters contained by it.
    Dim aParameter As Parameter
    For Each aParameter in aSqlDataSource.SelectParameters
        Response.Write(aParameter.Name & "<BR>")
    Next
End Sub ' Page_Load
</SCRIPT>

注解

使用此方法从集合中删除指定的 Parameter 对象 ParameterCollection

适用于

另请参阅