Question

文件大小为2KB或更低时会成功上传。我使用流媒体的主要原因是能够上传至少1 GB的文件。但是当我尝试上传大小不超过1MB的文件时，我收到了不好的请求。这是我第一次处理下载和上传过程，所以我不能轻易找到错误原因。

测试部分：

private void button24_Click(object sender, EventArgs e)
{
    try
    {
        OpenFileDialog openfile = new OpenFileDialog();
        if (openfile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            string port = "3445";
            byte[] fileStream;
            using (FileStream fs = new FileStream(openfile.FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                fileStream = new byte[fs.Length];
                fs.Read(fileStream, 0, (int)fs.Length);
                fs.Close();
                fs.Dispose();
            }

            string baseAddress = "http://localhost:" + port + "/File/AddStream?fileID=9";
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(baseAddress);
            request.Method = "POST";
            request.ContentType = "text/plain";
            //request.ContentType = "application/octet-stream";
            Stream serverStream = request.GetRequestStream();
            serverStream.Write(fileStream, 0, fileStream.Length);
            serverStream.Close();
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                int statusCode = (int)response.StatusCode;
                StreamReader reader = new StreamReader(response.GetResponseStream());
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

服务：

[WebInvoke(UriTemplate = "AddStream?fileID={fileID}", Method = "POST", BodyStyle = WebMessageBodyStyle.Bare)]
public bool AddStream(long fileID, System.IO.Stream fileStream)
{
    ClasslLogic.FileComponent svc = new ClasslLogic.FileComponent();
    return svc.AddStream(fileID, fileStream);
}

流媒体的服务器代码：

namespace ClasslLogic
{
    public class StreamObject : IStreamObject
    {
        public bool UploadFile(string filename, Stream fileStream)
        {
            try
            {
                FileStream fileToupload = new FileStream(filename, FileMode.Create);
                byte[] bytearray = new byte[10000];
                int bytesRead, totalBytesRead = 0;
                do
                {
                    bytesRead = fileStream.Read(bytearray, 0, bytearray.Length);
                    totalBytesRead += bytesRead;
                } while (bytesRead > 0);

                fileToupload.Write(bytearray, 0, bytearray.Length);
                fileToupload.Close();
                fileToupload.Dispose();
            }
            catch (Exception ex) { throw new Exception(ex.Message); }
            return true;
        }
    }
}

网络配置：

<system.serviceModel>
<bindings>
  <basicHttpBinding>
    <binding>
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="2097152" maxBytesPerRead="4096" maxNameTableCharCount="2097152" />
      <security mode="None" />
    </binding>
    <binding name="ClassLogicBasicTransfer" closeTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:15:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="67108864" maxReceivedMessageSize="67108864" messageEncoding="Mtom" textEncoding="utf-8" useDefaultWebProxy="true">
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="67108864" maxBytesPerRead="4096" maxNameTableCharCount="67108864" />
      <security mode="None">
        <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
        <message clientCredentialType="UserName" algorithmSuite="Default" />
      </security>
    </binding>
    <binding name="BaseLogicWSHTTP">
      <security mode="None" />
    </binding>
    <binding name="BaseLogicWSHTTPSec" />
  </basicHttpBinding>
</bindings>
<behaviors>
  <serviceBehaviors>
    <behavior>
      <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
      <serviceMetadata httpGetEnabled="true" />
      <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
      <serviceDebug includeExceptionDetailInFaults="true" />
    </behavior>
  </serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" />
</system.serviceModel>

我不确定这是否会影响流功能，因为我正在使用WCF4.0休息模板哪个配置依赖于Global.asax。

还有一点是，无论我是否运行服务并传递流，创建的文件总是包含这个东西。

enter image description here

如何删除“NUL”数据？

提前致谢。

修改

public bool UploadFile(string filename, Stream fileStream)
        {
            try
            {
                FileStream fileToupload = new FileStream(filename, FileMode.Create);
                byte[] bytearray = new byte[10000];
                int bytesRead, totalBytesRead = 0;
                do
                {
                    bytesRead = fileStream.Read(bytearray, totalBytesRead, bytearray.Length - totalBytesRead);
                    totalBytesRead += bytesRead;

                } while (bytesRead > 0);

                fileToupload.Write(bytearray, 0, totalBytesRead);
                fileToupload.Close();
                fileToupload.Dispose();
            }
            catch (Exception ex) { throw new Exception(ex.Message); }
            return true;
        }

Answer 1

我认为您看到空值的原因是因为以下行。你正在初始化一个缓冲区，但你可能没有填充整个缓冲区：

fileToupload.Write(bytearray, 0, bytearray.Length);
fileToupload.Close();
fileToupload.Dispose();

应该是：

fileToupload.Write(bytearray, 0, totalBytesRead);
fileToupload.Close();
fileToupload.Dispose();

你也总是在每次循环迭代中覆盖你的缓冲区：

fileStream.Read(bytearray, 0, bytearray.Length)`.

当你可能想要这个，因为它继续填充你的缓冲区的其余部分：

fileStream.Read(bytearray, totalBytesRead, byteArray.Length - totalBytesRead);

但是，如果您移动写入循环内文件的代码，那么您只需对现有代码进行最少的更改：

int bytesRead, totalBytesRead = 0;
do
{
    bytesRead = fileStream.Read(bytearray, 0, bytearray.Length);
    if (bytesRead > 0)
    {
        fileToupload.Write(bytearray, 0, bytesRead);
    }
} while (bytesRead > 0);

如果您尝试发送的数据超过MaxReceivedMessageSize，则会收到400。相应调整：

<binding maxReceivedMessageSize="10485760">

远程服务器返回错误：（400）错误请求 - 上传少2MB文件大小？

1 个答案: