HttpRequestMessageProperty.Method 屬性

定義

命名空間:

System.ServiceModel.Channels

組件:

System.ServiceModel.Http.dll

組件:

System.ServiceModel.dll

取得或設定 HTTP 要求的 HTTP 動詞。

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

屬性值

String

HTTP 要求的 HTTP 動詞。

例外狀況

ArgumentNullException

這個值設定為 null。

範例

下列程式碼會從訊息中取得這個類別的執行個體，然後分派到以這個屬性為根據的其他方法。

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

備註

根據預設，WCF 會針對 HTTP 訊息使用 POST 動詞。 WCF 會使用 GET 動詞，在存取 ServiceHost 的基底位址時顯示說明資訊。 這適用于檢查 WCF 服務在使用網頁瀏覽器時是否作用中。 HTTP RFC所定義的其他方法是 PUT、DELETE、HEAD、OPTIONS、TRACE 和 CONNECT。 當這些方法與其他服務互通時，會有特殊的行為。