wcf文件传输期间的大内存消耗

Question

我正在使用this example，虽然我点击上传时转移方法已流式传输，但客户端上的内存消耗会跃升至1GB。传输完成后，内存不会减少。我的代码如下：

DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog.
if (result == DialogResult.OK) // Test result.
{                 
    if (File.Exists(openFileDialog1.FileName))
    {
        //System.IO.FileInfo fileInfo = new System.IO.FileInfo(openFileDialog1.FileName);
        FileTransferServiceReference.ITransferService clientUpload = new FileTransferServiceReference.TransferServiceClient();
        FileTransferServiceReference.RemoteFileInfo uploadRequestInfo = new RemoteFileInfo();

         uploadRequestInfo.FileName = openFileDialog1.FileName;
         uploadRequestInfo.Length = new FileInfo(openFileDialog1.FileName).Length;
         uploadRequestInfo.FileByteStream = File.OpenRead(openFileDialog1.FileName);
         clientUpload.UploadFile(uploadRequestInfo);
     }
        }           

在App.config上有

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <startup> 
      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
   </startup>
<system.web>
<httpRuntime maxRequestLength="2097150"/>
</system.web>
<system.serviceModel>
    <bindings>
        <basicHttpBinding>
            <binding name="BasicHttpBinding_ITransferService" />
        </basicHttpBinding>
    </bindings>
    <client>
        <endpoint address="http://62.1.193.176/transferTEST/wcfTest.TransferService.svc"
            binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_ITransferService"
            contract="FileTransferServiceReference.ITransferService" name="BasicHttpBinding_ITransferService" />
    </client>
</system.serviceModel>
</configuration>