C# NET 4上的WCF流式文件传输

我需要一个关于WCF流文件传输的好例子

我已经找到了一些，并尝试了他们，但帖子是旧的，我在.NET4和IIS7上工作，所以有一些问题

---

你能给我一个很好的最新例子吗。

下面的答案详细介绍了将二进制数据发布到restful服务的一些技巧

下面的代码是如何编写RESTful WCF服务的示例，虽然并不完整，但确实给出了可以从何处开始的指示

示例服务，请注意，这不是生产就绪代码

[ServiceContract]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class FileService
{
    private IncomingWebRequestContext m_Request;
    private OutgoingWebResponseContext m_Response;

    [WebGet(UriTemplate = "{appName}/{id}?action={action}")]
    public Stream GetFile(string appName, string id, string action)
    {
        var repository = new FileRepository();
        var response = WebOperationContext.Current.OutgoingResponse;
        var result = repository.GetById(int.Parse(id));

        if (action != null && action.Equals("download", StringComparison.InvariantCultureIgnoreCase))
        {
            response.Headers.Add("Content-Disposition", string.Format("attachment; filename={0}", result.Name));
        }

        response.Headers.Add(HttpResponseHeader.ContentType, result.ContentType);
        response.Headers.Add("X-Filename", result.Name);

        return result.Content;
    }

    [WebInvoke(UriTemplate = "{appName}", Method = "POST")]
    public void Save(string appName, Stream fileContent)
    {
        try
        {
            if (WebOperationContext.Current == null) throw new InvalidOperationException("WebOperationContext is null.");

            m_Request = WebOperationContext.Current.IncomingRequest;
            m_Response = WebOperationContext.Current.OutgoingResponse;

            var file = CreateFileResource(fileContent, appName);

            if (!FileIsValid(file)) throw new WebFaultException(HttpStatusCode.BadRequest);

            SaveFile(file);

            SetStatusAsCreated(file);
        }
        catch (Exception ex)
        {
            if (ex.GetType() == typeof(WebFaultException)) throw;
            if (ex.GetType().IsGenericType && ex.GetType().GetGenericTypeDefinition() == typeof(WebFaultException<>)) throw;

            throw new WebFaultException<string>("An unexpected error occurred.", HttpStatusCode.InternalServerError);
        }
    }

    private FileResource CreateFileResource(Stream fileContent, string appName)
    {
        var result = new FileResource();

        fileContent.CopyTo(result.Content);
        result.ApplicationName = appName;
        result.Name = m_Request.Headers["X-Filename"];
        result.Location = @"C:\SomeFolder\" + result.Name;
        result.ContentType = m_Request.Headers[HttpRequestHeader.ContentType] ?? this.GetContentType(result.Name);
        result.DateUploaded = DateTime.Now;

        return result;
    }

    private string GetContentType(string filename)
    {
        // this should be replaced with some form of logic to determine the correct file content type (I.E., use registry, extension, xml file, etc.,)
        return "application/octet-stream";
    }

    private bool FileIsValid(FileResource file)
    {
        var validator = new FileResourceValidator();
        var clientHash = m_Request.Headers[HttpRequestHeader.ContentMd5];

        return validator.IsValid(file, clientHash);
    }

    private void SaveFile(FileResource file)
    {
        // This will persist the meta data about the file to a database (I.E., size, filename, file location, etc)
        new FileRepository().AddFile(file);
    }

    private void SetStatusAsCreated(FileResource file)
    {
        var location = new Uri(m_Request.UriTemplateMatch.RequestUri.AbsoluteUri + "/" + file.Id);
        m_Response.SetStatusAsCreated(location);
    }
}

// *********************************
// Sample Client
// *********************************
private void UploadButton_Click(object sender, EventArgs e)
{
    var uri = "http://dev-fileservice/SampleApplication"
    var fullFilename = @"C:\somefile.txt";
    var fileContent = File.ReadAllBytes(fullFilename);

    using (var webClient = new WebClient())
    {
        try
        {
            webClient.Proxy = null;
            webClient.Headers.Add(HttpRequestHeader.ContentMd5, this.CalculateFileHash());
            webClient.Headers.Add("X-DaysToKeep", DurationNumericUpDown.Value.ToString());
            webClient.Headers.Add("X-Filename", Path.GetFileName(fullFilename));
            webClient.UploadData(uri, "POST", fileContent);

            var fileUri = webClient.ResponseHeaders[HttpResponseHeader.Location];
            Console.WriteLine("File can be downloaded at" + fileUri);
        }
        catch (Exception ex)
        {
            var exception = ex.Message;
        }
    }
}

private string CalculateFileHash()
{
    var hash = MD5.Create().ComputeHash(File.ReadAllBytes(@"C:\somefile.txt"));
    var sb = new StringBuilder();

    for (int i = 0; i < hash.Length; i++)
    {
        sb.Append(hash[i].ToString("x2"));
    }

    return sb.ToString();
}

private void DownloadFile()
{
    var uri = "http://dev-fileservice/SampleApplication/1" // this is the URL returned by the Restful file service

    using (var webClient = new WebClient())
    {
        try
        {
            webClient.Proxy = null;
            var fileContent = webClient.DownloadData(uri);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

[服务合同]
[AspNetCompatibilityRequirements（RequirementsMode=AspNetCompatibilityRequirementsMode.Allowed）]
[ServiceBehavior（InstanceContextMode=InstanceContextMode.PerCall）]
公共类文件服务
{
私有收入WebRequestContext m_请求；
私人支出网络响应文本m_响应；
[WebGet（UriTemplate=“{appName}/{id}？action={action}”）]
公共流GetFile（字符串appName、字符串id、字符串操作）
{
var repository=newfilerepository（）；
var response=WebOperationContext.Current.OutgoingResponse；
var result=repository.GetById（int.Parse（id））；
if（action！=null&&action.Equals（“下载”，StringComparison.InvariantCultureIgnoreCase））
{
Add（“内容处置”，string.Format（“附件；文件名={0}”，result.Name））；
}
Add（HttpResponseHeader.ContentType，result.ContentType）；
添加（“X-Filename”，result.Name）；
返回结果。内容；
}
[WebInvoke（UriTemplate=“{appName}”，Method=“POST”）]
public void Save（字符串appName，流文件内容）
{
尝试
{
如果（WebOperationContext.Current==null）抛出新的InvalidOperationException（“WebOperationContext为null”）；
m_Request=WebOperationContext.Current.IncomingRequest；
m_Response=WebOperationContext.Current.OutgoingResponse；
var file=CreateFileResource（fileContent，appName）；
如果（！FileIsValid（file））抛出新的WebFaultException（HttpStatusCode.BadRequest）；
保存文件（文件）；
SetStatusAsCreated（文件）；
}
捕获（例外情况除外）
{
如果（例如GetType（）==typeof（WebFaultException））抛出；
if（例如GetType（）.IsGenericType&&ex.GetType（）.GetGenericTypeDefinition（）==typeof（WebFaultException））抛出；
抛出新的WebFaultException（“发生意外错误。”，HttpStatusCode.InternalServerError）；
}
}
私有文件资源CreateFileResource（流文件内容，字符串appName）
{
var result=new FileResource（）；
fileContent.CopyTo（result.Content）；
result.ApplicationName=appName；
result.Name=m_请求.Headers[“X-Filename”]；
result.Location=@“C:\SomeFolder\”+result.Name；
result.ContentType=m_请求.Headers[HttpRequestHeader.ContentType]？？this.GetContentType（result.Name）；
result.dateupload=DateTime.Now；
返回结果；
}
私有字符串GetContentType（字符串文件名）
{
//这应该用某种形式的逻辑来代替，以确定正确的文件内容类型（即，使用注册表、扩展名、xml文件等）
返回“应用程序/八位字节流”；
}
私有bool FileIsValid（FileResource文件）
{
var validator=新的FileResourceValidator（）；
var clientHash=m_Request.Headers[HttpRequestHeader.ContentMd5]；
返回validator.IsValid（文件，clientHash）；
}
私有void保存文件（FileResource文件）
{
//这将把有关文件的元数据持久化到数据库中（即大小、文件名、文件位置等）
新建FileRepository（）.AddFile（文件）；
}
私有void SetStatusAsCreated（文件资源文件）
{
var location=新Uri（m_Request.UriTemplateMatch.RequestUri.AbsoluteUri+“/”+file.Id）；
m_响应。设置状态已创建（位置）；
}
}

示例客户端，请注意，这不是生产就绪代码

[ServiceContract]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class FileService
{
    private IncomingWebRequestContext m_Request;
    private OutgoingWebResponseContext m_Response;

    [WebGet(UriTemplate = "{appName}/{id}?action={action}")]
    public Stream GetFile(string appName, string id, string action)
    {
        var repository = new FileRepository();
        var response = WebOperationContext.Current.OutgoingResponse;
        var result = repository.GetById(int.Parse(id));

        if (action != null && action.Equals("download", StringComparison.InvariantCultureIgnoreCase))
        {
            response.Headers.Add("Content-Disposition", string.Format("attachment; filename={0}", result.Name));
        }

        response.Headers.Add(HttpResponseHeader.ContentType, result.ContentType);
        response.Headers.Add("X-Filename", result.Name);

        return result.Content;
    }

    [WebInvoke(UriTemplate = "{appName}", Method = "POST")]
    public void Save(string appName, Stream fileContent)
    {
        try
        {
            if (WebOperationContext.Current == null) throw new InvalidOperationException("WebOperationContext is null.");

            m_Request = WebOperationContext.Current.IncomingRequest;
            m_Response = WebOperationContext.Current.OutgoingResponse;

            var file = CreateFileResource(fileContent, appName);

            if (!FileIsValid(file)) throw new WebFaultException(HttpStatusCode.BadRequest);

            SaveFile(file);

            SetStatusAsCreated(file);
        }
        catch (Exception ex)
        {
            if (ex.GetType() == typeof(WebFaultException)) throw;
            if (ex.GetType().IsGenericType && ex.GetType().GetGenericTypeDefinition() == typeof(WebFaultException<>)) throw;

            throw new WebFaultException<string>("An unexpected error occurred.", HttpStatusCode.InternalServerError);
        }
    }

    private FileResource CreateFileResource(Stream fileContent, string appName)
    {
        var result = new FileResource();

        fileContent.CopyTo(result.Content);
        result.ApplicationName = appName;
        result.Name = m_Request.Headers["X-Filename"];
        result.Location = @"C:\SomeFolder\" + result.Name;
        result.ContentType = m_Request.Headers[HttpRequestHeader.ContentType] ?? this.GetContentType(result.Name);
        result.DateUploaded = DateTime.Now;

        return result;
    }

    private string GetContentType(string filename)
    {
        // this should be replaced with some form of logic to determine the correct file content type (I.E., use registry, extension, xml file, etc.,)
        return "application/octet-stream";
    }

    private bool FileIsValid(FileResource file)
    {
        var validator = new FileResourceValidator();
        var clientHash = m_Request.Headers[HttpRequestHeader.ContentMd5];

        return validator.IsValid(file, clientHash);
    }

    private void SaveFile(FileResource file)
    {
        // This will persist the meta data about the file to a database (I.E., size, filename, file location, etc)
        new FileRepository().AddFile(file);
    }

    private void SetStatusAsCreated(FileResource file)
    {
        var location = new Uri(m_Request.UriTemplateMatch.RequestUri.AbsoluteUri + "/" + file.Id);
        m_Response.SetStatusAsCreated(location);
    }
}

// *********************************
// Sample Client
// *********************************
private void UploadButton_Click(object sender, EventArgs e)
{
    var uri = "http://dev-fileservice/SampleApplication"
    var fullFilename = @"C:\somefile.txt";
    var fileContent = File.ReadAllBytes(fullFilename);

    using (var webClient = new WebClient())
    {
        try
        {
            webClient.Proxy = null;
            webClient.Headers.Add(HttpRequestHeader.ContentMd5, this.CalculateFileHash());
            webClient.Headers.Add("X-DaysToKeep", DurationNumericUpDown.Value.ToString());
            webClient.Headers.Add("X-Filename", Path.GetFileName(fullFilename));
            webClient.UploadData(uri, "POST", fileContent);

            var fileUri = webClient.ResponseHeaders[HttpResponseHeader.Location];
            Console.WriteLine("File can be downloaded at" + fileUri);
        }
        catch (Exception ex)
        {
            var exception = ex.Message;
        }
    }
}

private string CalculateFileHash()
{
    var hash = MD5.Create().ComputeHash(File.ReadAllBytes(@"C:\somefile.txt"));
    var sb = new StringBuilder();

    for (int i = 0; i < hash.Length; i++)
    {
        sb.Append(hash[i].ToString("x2"));
    }

    return sb.ToString();
}

private void DownloadFile()
{
    var uri = "http://dev-fileservice/SampleApplication/1" // this is the URL returned by the Restful file service

    using (var webClient = new WebClient())
    {
        try
        {
            webClient.Proxy = null;
            var fileContent = webClient.DownloadData(uri);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

//*********************************
//样本客户机
// *********************************
私有无效上载按钮\单击（对象发送者，事件参数e）
{
var uri=”http://dev-fileservice/SampleApplication"
var fullFilename=@“C:\somefile.txt”；
var fileContent=File.ReadAllBytes（fullFilename）；
使用（var webClient=new webClient（））
{
尝试
{
webClient.Proxy=null；
添加（HttpRequestHeader.ContentMd5，this.CalculateFileHash（））；
添加（“X-DaysToKeep”，DurationNumericUpDown.Value.ToString（））；
添加（“X-Filename”，Path.GetFileName（fullFilename））；
上传数据（uri，“POST”，文件内容）；
var fileUri=webClient.ResponseHeaders[HttpResponseHeader.Location]；
Console.WriteLine（“可以在“+fileUri”下载文件）；
}
捕获（例外情况除外）
{
var异常=例如消息；
}
}
}
私有字符串CalculateFileHash（）
{
var hash=MD5.Create（）.ComputeHash（File.ReadAllBytes（@“C:\somefile.txt”）；
var sb=新的StringBuilder（）；
for（int i=0；i