WCF WebInvoke可以接受内容类型:文本/纯文本? [英] WCF WebInvoke which can accept content-type: text/plain?

问题描述

我正在编写WCF REST服务以通过WCF REST服务接收AWS SNS通知消息.

I'm writing a WCF REST service to receive AWS SNS Notification Message with my WCF REST Service.

但是，根据当我通过此文本/纯文本"致电我的服务时，内容类型(例如Amazon)，出现错误提示:

When I call my service with this "text/plain" content type like Amazon, there is an error which says:

请求错误.

服务器在处理请求时遇到错误.异常消息是传入消息的消息格式为意外的原始".该操作的预期消息格式为"Xml"； 杰森".这可能是因为尚未在绑定上配置WebContentTypeMapper.有关更多详细信息，请参见WebContentTypeMapper的文档.有关更多详细信息，请参阅服务器日志.

The server encountered an error processing the request. The exception message is 'The incoming message has an unexpected message format 'Raw'. The expected message formats for the operation are 'Xml'; 'Json'. This can be because a WebContentTypeMapper has not been configured on the binding. See the documentation of WebContentTypeMapper for more details.'. See server logs for more details.

我当前的代码:

public interface MyServiceInterface
{
    [OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "/AmazonIPChanges")]
    Task AmazonIPChanges(SNSNotificationMessage data);
}

[DataContract]
public class SNSNotificationMessage
{
    [DataMember]
    public string Type { get; set; }
    // ...
    [DataMember]
    public string UnsubscribeURL { get; set; }
} 

DataContract映射到Amazon SNS消息.当我执行内容类型为"application/json"的POST时，此代码有效，但是如何让它接受Amazon的text/plain内容类型?

The DataContract maps to the Amazon SNS message. This code is working when I perform a POST with content-type "application/json", but how can I let it accept Amazon's text/plain content-type?

推荐答案

如错误消息所示，您可以通过创建并应用自定义的WebContentTypeMapper来解决此问题.它应该看起来像这样:

You can fix this, as the error message indicates, by creating and applying a custom WebContentTypeMapper. It should look like this:

namespace StackOverflow36216464
{
    public class RawContentTypeMapper : WebContentTypeMapper
    {
        public override WebContentFormat GetMessageFormatForContentType(string contentType)
        {
            switch (contentType.ToLowerInvariant())
            {
                case "text/plain":
                case "application/json":
                    return WebContentFormat.Json;
                case "application/xml":
                    return WebContentFormat.Xml;
                default:
                    return WebContentFormat.Default;
            }
        }
    }
}

这将解释请求的内容类型，并返回相应的WebContentFormat枚举成员.

This one interprets the content-type of the request, and returns the appropriate WebContentFormat enum member.

然后您可以以自定义绑定的形式将其应用于您的服务:

You can then apply it to your service in the form of a custom binding:

<system.serviceModel>
    <bindings>
        <customBinding>
            <binding name="textPlainToApplicationJson">
                <webMessageEncoding webContentTypeMapperType="StackOverflow36216464.RawContentTypeMapper, StackOverflow36216464, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
                <httpTransport manualAddressing="true" />
            </binding>
        </customBinding>
    </bindings>
    <behaviors>
        <serviceBehaviors>
            <behavior name="debugServiceBehavior">
                <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
        </serviceBehaviors>
        <endpointBehaviors>
            <behavior name="restEndpointBehavior">
                <webHttp />
            </behavior>
        </endpointBehaviors>
    </behaviors>
    <services>
        <service
          name="StackOverflow36216464.Service1"
          behaviorConfiguration="debugServiceBehavior">
            <host>
                <baseAddresses>
                    <add baseAddress="http://localhost:65393/"/>
                </baseAddresses>
            </host>
            <endpoint address=""
                  binding="customBinding"
                  contract="StackOverflow36216464.IService1"
                  behaviorConfiguration="restEndpointBehavior"
                  bindingConfiguration="textPlainToApplicationJson"/>        
        </service>
    </services>
</system.serviceModel>

相关部分是<customBinding>元素(在其中配置了自定义映射器)和servcices/service/endpoint/bindingConfiguration属性(在其中应用了

The relevant part being the <customBinding> element, where the custom mapper is configured, and the servcices/service/endpoint/bindingConfiguration attribute where it is applied.

这篇关于WCF WebInvoke可以接受内容类型:文本/纯文本?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！