ViewStateException.Referer Properti

Definisi

Ruang nama:

System.Web.UI

Rakitan:

System.Web.dll

Mendapatkan URL halaman yang ditautkan ke halaman tempat pengecualian status tampilan terjadi.

public:
 property System::String ^ Referer { System::String ^ get(); };

public string Referer { get; }

member this.Referer : string

Public ReadOnly Property Referer As String

Nilai Properti

String

yang String berisi perujuk HTTP.

Contoh

Contoh kode berikut menunjukkan cara menerapkan metode yang mendeserialisasi string yang dikodekan base64 dan mengembalikan ICollection kumpulan pengaturan properti. Metode ini Deserialize dapat melemparkan HttpException pengecualian yang berisi ViewStateException objek sebagai pengecualian dalam. Contoh menunjukkan bagaimana Anda dapat menangkap HttpException pengecualian dan mengambil properti dari ViewStateException objek.

private ICollection LoadControlProperties(string serializedProperties)
{

    ICollection controlProperties = null;

    // Create an ObjectStateFormatter to deserialize the properties.
    ObjectStateFormatter formatter = new ObjectStateFormatter();

    try
    {
        // Call the Deserialize method.
        controlProperties = (ArrayList)formatter.Deserialize(serializedProperties);
    }
    catch (HttpException e)
    {
        ViewStateException vse = (ViewStateException)e.InnerException;
        String logMessage;

        logMessage = "ViewStateException. Path: " + vse.Path + Environment.NewLine;
        logMessage += "PersistedState: " + vse.PersistedState + Environment.NewLine;
        logMessage += "Referer: " + vse.Referer + Environment.NewLine;
        logMessage += "UserAgent: " + vse.UserAgent + Environment.NewLine;

        LogEvent(logMessage);

        if (vse.IsConnected)
        {
            HttpContext.Current.Response.Redirect("ErrorPage.aspx");
        }
        else
        {
            throw e;
        }
    }
    return controlProperties;
}

Private Function LoadControlProperties(ByVal serializedProperties As String) As ICollection

    Dim controlProperties As ICollection = Nothing

    ' Create an ObjectStateFormatter to deserialize the properties.
    Dim formatter As New ObjectStateFormatter()

    Try
        ' Call the Deserialize method.
        controlProperties = CType(formatter.Deserialize(serializedProperties), ArrayList)
    Catch e As HttpException
        Dim vse As ViewStateException
        Dim logMessage As String

        vse = e.InnerException

        logMessage = "ViewStateException. Path: " + vse.Path + Environment.NewLine
        logMessage += "PersistedState: " + vse.PersistedState + Environment.NewLine
        logMessage += "Referer: " + vse.Referer + Environment.NewLine
        logMessage += "UserAgent: " + vse.UserAgent + Environment.NewLine

        LogEvent(logMessage)

        If (vse.IsConnected) Then
            HttpContext.Current.Response.Redirect("ErrorPage.aspx")
        Else
            Throw e
        End If
    End Try
    Return controlProperties
End Function 'LoadControlProperties

Keterangan

Properti ini mengembalikan nilai yang sama dengan HTTP_REFERER variabel dalam ServerVariables properti . Nilainya adalah string kosong ("") jika tidak ada permintaan sebelumnya yang ditautkan ke halaman.