RequestValidationSource Enum

Definisi

public enum class RequestValidationSource

public enum RequestValidationSource

type RequestValidationSource = 

Public Enum RequestValidationSource

Warisan

Object

ValueType

Enum

RequestValidationSource

Bidang

Contoh

Contoh berikut menunjukkan cara membuat kelas validator permintaan kustom yang hanya memungkinkan string tertentu untuk nilai string kueri.

Imports System.Web
Imports System.Web.Util

Public Class CustomRequestValidation
    Inherits RequestValidator

Protected Overloads Overrides Function IsValidRequestString( _
        ByVal context As HttpContext, _
        ByVal value As String, _
        ByVal requestValidationSource__1 As RequestValidationSource, _
        ByVal collectionKey As String, _
        ByRef validationFailureIndex As Integer) As Boolean
    validationFailureIndex = -1
    ' Set a default value for the out parameter.
    ' This application does not use RawUrl directly, so you can
    ' ignore the check for RequestValidationSource.RawUrl.
    If requestValidationSource = RequestValidationSource.RawUrl Then
        Return True
    End If

    ' Allow the query-string key "data" to have an XML-like value.
    If (requestValidationSource = _
            (RequestValidationSource.QueryString) AndAlso _
            (collectionKey = "data") Then
        ' The querystring value "<example>1234</example>" is allowed.
        If value = "<example>1234</example>" Then
            validationFailureIndex = -1
            Return True
        Else
            ' Leave any further checks to ASP.NET.
            Return MyBase.IsValidRequestString(context, value, _
                requestValidationSource__1, collectionKey, _
                validationFailureIndex)
        End If
    Else
        ' All other HTTP input checks fall back to
        ' the base ASP.NET implementation.
        Return MyBase.IsValidRequestString(context, value, _
            requestValidationSource__1, collectionKey, _
            validationFailureIndex)
    End If
End Function
End Class

using System;
using System.Web;
using System.Web.Util;

public class CustomRequestValidation : RequestValidator
{
    public CustomRequestValidation() {}

    protected override bool IsValidRequestString(
        HttpContext context, string value,
        RequestValidationSource requestValidationSource, string collectionKey,
        out int validationFailureIndex)
    {
        //Set a default value for the out parameter.
        validationFailureIndex = -1;

        // This application does not use RawUrl directly,
        // so you can ignore the check for RequestValidationSource.RawUrl.
        if (requestValidationSource == RequestValidationSource.RawUrl)
            return true;

        // Allow the query-string key "data" to have an XML-like value.
        if (
            (requestValidationSource == RequestValidationSource.QueryString) &&
            (collectionKey == "data")
           )
        {
            // The querystring value "<example>1234</example>" is allowed.
            if (value == "<example>1234</example>")
            {
                validationFailureIndex = -1;
                return true;
            }
            else
           // Leave any further checks to ASP.NET.
                return base.IsValidRequestString(context, value,
                requestValidationSource, collectionKey, out
                validationFailureIndex);
        }
        // All other HTTP input checks fall back to
        // the base ASP.NET implementation.
        else
        {
            return base.IsValidRequestString(context, value,
                requestValidationSource, collectionKey,
                out validationFailureIndex);
        }
    }
}

Contoh berikut menunjukkan cara mengonfigurasi ASP.NET untuk menggunakan validator kustom.

<httpRuntime requestValidationType="CustomRequestValidation" />

Keterangan

Anda dapat membuat jenis validasi permintaan kustom dengan menerapkan jenisnya RequestValidator . Saat ASP.NET memanggil metode IsValidRequestString untuk memvalidasi permintaan, ASP.NET meneruskan parameter requestValidationSource untuk menentukan sumber data yang sedang divalidasi. Enumerasi RequestValidationSource digunakan untuk menentukan sumber atau jenis data permintaan yang sedang divalidasi. Enumerasi menunjukkan jenis input HTTP yang diteruskan dalam value parameter IsValidRequestString metode . Anda dapat menggunakan enumerasi sebagai cara untuk kembali ke implementasi validasi permintaan dasar untuk input HTTP jika Anda tidak ingin memvalidasi menggunakan logika kustom.

Tabel berikut menunjukkan bagaimana nilai collectionKey parameter dan value metode ditafsirkan RequestValidator.IsValidRequestString untuk setiap anggota RequestValidationSource enumerasi.

Lihat juga

• RequestValidator