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ParameterCollection.RemoveAt(Int32) Metode

Definisi

Ruang nama:
System.Web.UI.WebControls
Rakitan:
System.Web.dll

Parameter Menghapus objek pada indeks yang ditentukan dari ParameterCollection koleksi.

public:
 void RemoveAt(int index);
public void RemoveAt(int index);
member this.RemoveAt : int -> unit
Public Sub RemoveAt (index As Integer)

Parameter

index
Int32

Indeks yang akan Parameter dihapus.

Contoh

Contoh kode berikut menunjukkan cara menggunakan RemoveAt metode untuk menghapus Parameter objek dari ParameterCollection koleksi di lokasi tertentu. Dalam contoh ini, beberapa QueryStringParameter objek ditambahkan ke SelectParameters koleksi, satu QueryStringParameter objek dihapus dari koleksi, dan urutan koleksi dicetak saat halaman dimuat.

<%@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 qs3 =
        new QueryStringParameter("QueryStringParam2","requestfield2");

    aSqlDataSource.SelectParameters.Add(qs3);

    // Insert another QueryStringParameter with the same name as the previous parameter.
    aSqlDataSource.SelectParameters.Add( new QueryStringParameter("QueryStringParameter2","requestfield3") );

    // There are two parameters named QueryStringParam3. Use the
    // RemoveAt method to remove the last element from the collection.
    aSqlDataSource.SelectParameters.RemoveAt( (aSqlDataSource.SelectParameters.Count - 1) );

    // 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>");
        QueryStringParameter qsptemp = (QueryStringParameter) aParameter;
        Response.Write("QueryStringField is " + qsptemp.QueryStringField + "<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)

    ' Insert another QueryStringParameter with the same name as the previous parameter.
    Dim qs3 As New QueryStringParameter("QueryStringParam2","requestfield3")
    aSqlDataSource.SelectParameters.Add(qs3)

    ' There are two parameters named QueryStringParam3. Use the
    ' RemoveAt method to remove the last element from the collection.
    aSqlDataSource.SelectParameters.RemoveAt( (aSqlDataSource.SelectParameters.Count - 1) )

    ' 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>")
        Dim qsptemp As QueryStringParameter = CType(aParameter, QueryStringParameter)
        Response.Write("QueryStringField is " & qsptemp.QueryStringField & "<BR>")
    Next
End Sub ' Page_Load
</SCRIPT>

Keterangan

RemoveAt Gunakan metode untuk menghapus Parameter objek pada indeks yang ditentukan dari koleksi.

Berlaku untuk

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