HttpRequestMessageProperty.Method Propriedade

Definição

Namespace:

System.ServiceModel.Channels

Assembly:

System.ServiceModel.Http.dll

Pacote:

System.ServiceModel.Http v6.2.0

Origem:

HttpRequestMessageProperty.cs

Obtém ou define o verbo HTTP para a solicitação HTTP.

public:
 property System::String ^ Method { System::String ^ get(); void set(System::String ^ value); };

public string Method { get; set; }

member this.Method : string with get, set

Public Property Method As String

Valor da propriedade

String

O verbo HTTP para a solicitação HTTP.

Exceções

ArgumentNullException

O valor é definido como null.

Exemplos

O código a seguir obtém uma instância dessa classe da mensagem e, em seguida, envia para diferentes métodos com base nessa propriedade.

public Message ProcessMessage(Message request)
{
    Message response = null;

    //The HTTP Method (e.g. GET) from the incoming HTTP request
    //can be found on the HttpRequestMessageProperty. The MessageProperty
    //is added by the HTTP Transport when the message is received.
    HttpRequestMessageProperty requestProperties =
        (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];

    //Here we dispatch to different internal implementation methods
    //based on the incoming HTTP verb.
    if (requestProperties != null)
    {
        if (String.Equals("GET", requestProperties.Method,
            StringComparison.OrdinalIgnoreCase))
        {
            response = GetCustomer(request);
        }
        else if (String.Equals("POST", requestProperties.Method,
            StringComparison.OrdinalIgnoreCase))
        {
            response = UpdateCustomer(request);
        }
        else if (String.Equals("PUT", requestProperties.Method,
            StringComparison.OrdinalIgnoreCase))
        {
            response = AddCustomer(request);
        }
        else if (String.Equals("DELETE", requestProperties.Method,
            StringComparison.OrdinalIgnoreCase))
        {
            response = DeleteCustomer(request);
        }
        else
        {
            //This service doesn't implement handlers for other HTTP verbs (such as HEAD), so we
            //construct a response message and use the HttpResponseMessageProperty to
            //set the HTTP status code to 405 (Method Not Allowed) which indicates the client 
            //used an HTTP verb not supported by the server.
            response = Message.CreateMessage(MessageVersion.None, String.Empty, String.Empty);

            HttpResponseMessageProperty responseProperty = new HttpResponseMessageProperty();
            responseProperty.StatusCode = HttpStatusCode.MethodNotAllowed;

            response.Properties.Add( HttpResponseMessageProperty.Name, responseProperty );
        }
    }
    else
    {
        throw new InvalidOperationException( "This service requires the HTTP transport" );
    }

    return response;
}

Public Function ProcessMessage(ByVal request As Message) As Message Implements IUniversalContract.ProcessMessage
    Dim response As Message = Nothing

    'The HTTP Method (e.g. GET) from the incoming HTTP request
    'can be found on the HttpRequestMessageProperty. The MessageProperty
    'is added by the HTTP Transport when the message is received.
    Dim requestProperties As HttpRequestMessageProperty = CType(request.Properties(HttpRequestMessageProperty.Name), HttpRequestMessageProperty)

    'Here we dispatch to different internal implementation methods
    'based on the incoming HTTP verb.
    If requestProperties IsNot Nothing Then
        If String.Equals("GET", requestProperties.Method, StringComparison.OrdinalIgnoreCase) Then
            response = GetCustomer(request)
        ElseIf String.Equals("POST", requestProperties.Method, StringComparison.OrdinalIgnoreCase) Then
            response = UpdateCustomer(request)
        ElseIf String.Equals("PUT", requestProperties.Method, StringComparison.OrdinalIgnoreCase) Then
            response = AddCustomer(request)
        ElseIf String.Equals("DELETE", requestProperties.Method, StringComparison.OrdinalIgnoreCase) Then
            response = DeleteCustomer(request)
        Else
            'This service doesn't implement handlers for other HTTP verbs (such as HEAD), so we
            'construct a response message and use the HttpResponseMessageProperty to
            'set the HTTP status code to 405 (Method Not Allowed) which indicates the client 
            'used an HTTP verb not supported by the server.
            response = Message.CreateMessage(MessageVersion.None, String.Empty, String.Empty)

            Dim responseProperty As New HttpResponseMessageProperty()
            responseProperty.StatusCode = HttpStatusCode.MethodNotAllowed

            response.Properties.Add(HttpResponseMessageProperty.Name, responseProperty)
        End If
    Else
        Throw New InvalidOperationException("This service requires the HTTP transport")
    End If

    Return response
End Function

Comentários

Por padrão, o WCF usa o verbo POST para mensagens HTTP. O verbo GET é usado pelo WCF para exibir informações de ajuda ao acessar o endereço base de um ServiceHost. Isso é útil para verificar se um serviço WCF está ativo ao usar um navegador da Web. Outros métodos definidos pelo HTTP RFC são PUT, DELETE, HEAD, OPTIONS, TRACE e CONNECT. Esses métodos têm comportamentos especiais ao interoperar com outros serviços.