ParameterCollection.Item[] 屬性

public:
 property System::Web::UI::WebControls::Parameter ^ default[System::String ^] { System::Web::UI::WebControls::Parameter ^ get(System::String ^ name); void set(System::String ^ name, System::Web::UI::WebControls::Parameter ^ value); };

public System.Web.UI.WebControls.Parameter this[string name] { get; set; }

member this.Item(string) : System.Web.UI.WebControls.Parameter with get, set

Default Public Property Item(name As String) As Parameter

參數

屬性值

集合中具有指定名稱的 Parameter。 如果集合中找不到 Parameter，則索引子會傳回 null。

範例

下列程式碼範例示範如何使用 Remove 方法和 Item[] 索引子，從 ParameterCollection 集合中移除 Parameter 物件。 在此範例中，會將數 QueryStringParameter 個 SelectParameters 物件新增至集合，一個 QueryStringParameter 物件會從集合中移除，而頁面載入時會列印集合的順序。

<%@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>

備註

使用此索引子，即可使用陣列標記法，依名稱從 ParameterCollection 集合取得 Parameter 物件。

另請參閱

• Parameter
• ControlParameter
• FormParameter
• QueryStringParameter
• SessionParameter
• ProfileParameter

public:
 property System::Web::UI::WebControls::Parameter ^ default[int] { System::Web::UI::WebControls::Parameter ^ get(int index); void set(int index, System::Web::UI::WebControls::Parameter ^ value); };

public System.Web.UI.WebControls.Parameter this[int index] { get; set; }

member this.Item(int) : System.Web.UI.WebControls.Parameter with get, set

Default Public Property Item(index As Integer) As Parameter

參數

屬性值

位在集合中指定索引處的 Parameter。

備註

使用此索引子可依物件在集合中 ParameterCollection 的位置取得 Parameter 物件。

另請參閱

• Parameter
• ControlParameter
• FormParameter
• QueryStringParameter
• SessionParameter
• ProfileParameter