Question

我必须创建一个允许下载pdf的WCF服务（.net 4.5），而不是REST模式。

我以这种方式定义界面

[ServiceContract]
public interface IService1
{
    [OperationContract]
    Stream GetPdfFile();
}

以这种方式实现GetPdfFile

    public Stream GetPdfFile()
    {
        Stream ret = null;
        try
        {
            string downloadFilePath = @"C:\Users\jjkdk\Desktop\WTI_PETERS.pdf";
            string fileName = downloadFilePath.Substring(downloadFilePath.LastIndexOf(@"\") + 1);
            String headerInfo = "attachment; filename=" + fileName;
            WebOperationContext.Current.OutgoingResponse.Headers["Content-Disposition"] = headerInfo;

            WebOperationContext.Current.OutgoingResponse.ContentType = "application/octet-stream";

            ret = File.OpenRead(downloadFilePath);
        }
        catch (Exception ex)
        {
            throw ex;
        }
        return ret;
    }

app.config中的服务标签如下：

<system.serviceModel>
    <services>
      <service name="WCFAperturaAllegatiCrm.Service1">
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost:8733/Design_Time_Addresses/WCFAperturaAllegatiCrm/Service1/" />
          </baseAddresses>
        </host>
        <endpoint address="" binding="basicHttpBinding" contract="WCFAperturaAllegatiCrm.IService1">
          <identity>
            <dns value="localhost"/>
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="True" httpsGetEnabled="True"/>
          <serviceDebug includeExceptionDetailInFaults="False" />          
        </behavior>
      </serviceBehaviors>
    </behaviors>
</system.serviceModel>

然后我创建了一个控制台客户端，上面运行WCF，在url服务中添加了一个服务引用，并在控制台中插入了以下代码：

SrvAperturaAllegati.Service1Client srv = new SrvAperturaAllegati.Service1Client();
Stream stream = srv.GetPdfFile();
Console.WriteLine();

我收到以下例外：

System.ServiceModel.ProtocolException：内容类型text / html; charset = utf-＆gt; 8响应消息与绑定的内容类型＆gt;（application / soap + xml; charset = utf-8）不匹配。如果使用自定义编码器，请确保＆gt;正确实现了IsContentTypeSupported方法。响应的前1024个字节＆gt;是：........

我在没有结果的情况下挣扎。

有人可以帮助我吗？

Answer 1

此问题来自

....
WebOperationContext.Current.OutgoingResponse.Headers["Content-Disposition"] = headerInfo;
WebOperationContext.Current.OutgoingResponse.ContentType = "application/octet-stream";
...

如果您想将此服务用作SOAP服务，则无法添加OutgoingResponse.Headers和OutgoingResponse.ContentType。评论这一行，它将在SOAP中正常工作。这行是用于REST服务的。

此处更正的代码：

public Stream GetPdfFile()
{
    Stream ret = null;
    try
    {
        string downloadFilePath = @"C:\Users\jjkdk\Desktop\WTI_PETERS.pdf";
        string fileName = downloadFilePath.Substring(downloadFilePath.LastIndexOf(@"\") + 1);
        String headerInfo = "attachment; filename=" + fileName;
        //WebOperationContext.Current.OutgoingResponse.Headers["Content-Disposition"] = headerInfo;

        //WebOperationContext.Current.OutgoingResponse.ContentType = "application/octet-stream";

        ret = File.OpenRead(downloadFilePath);
    }
    catch (Exception ex)
    {
        throw ex;
    }
    return ret;
}

使用WCF下载Pdf文件

1 个答案: