[英]Unable to read bytes in WCF Streamed transfer mode in UWP
I have a UWP client application which talks to a Windows service application using WCF Streamed transfer mode:我有一个 UWP 客户端应用程序,它使用 WCF 流传输模式与 Windows 服务应用程序对话:
var bnd = new NetTcpBinding(SecurityMode.None) { TransferMode = TransferMode.Streamed }
I have used Stream objects as request and response parameters in the contract method.我在合约方法中使用了 Stream 对象作为请求和响应参数。
[OperationContract]
Stream RequestEncrypt(Stream data);
But I'm unable to read the byte array from the Stream object response in the UWP code:但我无法从 UWP 代码中的 Stream object 响应中读取字节数组:
using (var memStream = new MemoryStream())
{
sourceStream.CopyTo(memStream);
byteArray = memStream.ToArray();
}
In the above code, CopyTo method hangs forever.在上面的代码中, CopyTo 方法永远挂起。 Control never gets returned to the next line.控制永远不会返回到下一行。 But this works fine in a Windows Console client application.但这在 Windows 控制台客户端应用程序中运行良好。
Does anyone have an idea?有人有想法吗?
What does it mean that the CopyTo method hangs forever? CopyTo 方法永远挂起是什么意思? Has it encountered an exception?它遇到异常了吗? I tested and found no problems.我测试并没有发现任何问题。 Here is my demo:这是我的演示:
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
public interface ICalculator
{
[OperationContract]
Stream RequestEncrypt();
}
public class Calcuator : ICalculator
{
public Stream RequestEncrypt()
{
string str = "i am a string";
byte[] array = Encoding.ASCII.GetBytes(str);
MemoryStream stream = new MemoryStream(array);
StreamReader reader = new StreamReader(stream);
return stream;
}
}
class Program
{
static void Main(string[] args)
{
// Step 1: Create a URI to serve as the base address.
Uri baseAddress = new Uri("net.tcp://localhost:8000/GettingStarted/");
// Step 2: Create a ServiceHost instance.
ServiceHost selfHost = new ServiceHost(typeof(Calcuator), baseAddress);
try
{
NetTcpBinding netTcpBinding = new NetTcpBinding(SecurityMode.None) { TransferMode = TransferMode.Streamed };
// Step 3: Add a service endpoint.
selfHost.AddServiceEndpoint(typeof(ICalculator), netTcpBinding, "CalculatorService");
// Step 4: Enable metadata exchange.
ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
// smb.HttpGetEnabled = true;
selfHost.Description.Behaviors.Add(smb);
Binding mexbinding = MetadataExchangeBindings.CreateMexTcpBinding();
selfHost.AddServiceEndpoint(typeof(IMetadataExchange), mexbinding, "mex");
// Step 5: Start the service.
selfHost.Open();
Console.WriteLine("The service is ready.");
// Close the ServiceHost to stop the service.
Console.WriteLine("Press <Enter> to terminate the service.");
Console.WriteLine();
Console.ReadLine();
selfHost.Close();
}
catch (CommunicationException ce)
{
Console.WriteLine("An exception occurred: {0}", ce.Message);
selfHost.Abort();
}
}
}
This is WCF Service.这是 WCF 服务。
In UWP, I successfully obtained the Stream and converted it into a string.在UWP中,我成功得到了Stream并转换成字符串。
UPDATE:更新:
You can try to increase the message size quotas:您可以尝试增加邮件大小配额:
<bindings>
<NetTcpBinding>
<binding name="NetTcpBinding"
maxReceivedMessageSize="20000000"
maxBufferSize="20000000"
maxBufferPoolSize="20000000">
<readerQuotas maxDepth="32"
maxArrayLength="200000000"
maxStringContentLength="200000000"/>
</binding>
</NetTcpBinding>
</bindings>
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