c# - 将文件从 silverlight 上传到 WCF 服务

Question

我无法将 wav 文件(从 Silverlight 4)上传到服务器(WCF .NET 4)。该文件从 SL 上传到服务器并将其写入磁盘。但是上传的文件被改变了。这两个文件(上传前和上传后的文件)大小完全相同，但内容不同。我尝试在普通控制台程序中上传，它工作正常。似乎 WCF 在序列化来自 SL 的数据时做了一些事情。任何人都知道发生了什么事吗？

服务代码如下:

[ServiceContract(Namespace = "")]
interface ISoundService
{
    [OperationContract]
    int UploadSound(UploadSoundFile file);
}

public int UploadSound(UploadSoundFile file)
{
    var path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/" + file.FileName;
    File.WriteAllBytes(path, file.File);
    return 0;
}

[DataContract]
public class UploadSoundFile
{
    [DataMember]
    public string FileName;

    [DataMember]
    public byte[] File;
}

服务配置是

<system.serviceModel>
    <bindings>
        <basicHttpBinding>
            <binding name="Service.SoundService.customBinding0" maxReceivedMessageSize="2000000" maxBufferSize="2000000">
                <readerQuotas maxArrayLength="2000000" maxStringContentLength="2000000"/>
            </binding>
        </basicHttpBinding>
    </bindings>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
    <services>
        <service behaviorConfiguration="Service.SoundServiceBehavior" name="Service.SoundService">
            <endpoint address="" binding="basicHttpBinding" contract="Service.ISoundService" bindingConfiguration="Service.SoundService.customBinding0"/>
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        </service>
    </services>
    <behaviors>
        <serviceBehaviors>
            <behavior name="Service.SoundServiceBehavior">
                <serviceMetadata httpGetEnabled="true"/>
                <serviceDebug includeExceptionDetailInFaults="true"/>
            </behavior>
        </serviceBehaviors>
    </behaviors>
</system.serviceModel>

Silverlight 客户端是:

private static int uploadSoundOnServer(string fileName, Stream stream)
{
    SoundServiceClient c = new SoundServiceClient();
    byte[] buffer = new byte[stream.Length];
    stream.Read(buffer, 0, checked((int)stream.Length));
    UploadSoundFile file = new UploadSoundFile() { FileName= fileName, File = buffer, };
    c.UploadSoundAsync(file);
    return 0;
}

Answer 1

我发现了问题。它与 WCF 或 SL 无关。问题是关于 IO，stream。

在 SL 应用程序中，流位置不是 0，因为它之前被操纵过。因此，在调用 stream.Read(...) 之前将位置更改回 0 时它会起作用。但我仍然想知道为什么它仍然能够读取整个流，即使位置之前不是 0(即使我将长度设置为(int)stream.Length)。也许当它到达流的末尾时，它会返回并再次从头开始读取？