WCF大数据量传输

对于WCF服务来说，默认情况下，其接收的最大数据量为65535字节。如超过这个范围，就必须修改默认设置。

1 客户端。客户端接收的最大数据值由传输协议的MaxReceivedMessageSize确定，示例如下：

class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Invocate self-host GetPictureFilestreem service... ...");

            XmlDictionaryReaderQuotas quotas = new XmlDictionaryReaderQuotas();
            quotas.MaxArrayLength = 65535;


            BasicHttpBinding httpBinding = new BasicHttpBinding();
            httpBinding.ReaderQuotas = quotas;
            httpBinding.MaxReceivedMessageSize = 6553600;
            EndpointAddress httpAddress = new EndpointAddress("http://localhost:8888/PictureStreemTransfers");

            WCFStreemTransfersClient client = new WCFStreemTransfersClient(httpBinding, httpAddress);
            string desPath = System.Environment.CurrentDirectory + "\\result.jpg";
            byte[] buf = client.GetPictureFilestreem();
            File.WriteAllBytes(desPath,buf);

            Console.WriteLine(@"write file =" + desPath);
            Console.Read();

        }
    }

上例中调用服务端的GetPictureFilestreem（）契约，获取返回的2进制数据流，写入result.jpg文件。

由于数据流的长度大于65535，所以通过设定

　　　　quotas.MaxArrayLength = 65535;
            httpBinding.ReaderQuotas = quotas;
            httpBinding.MaxReceivedMessageSize = 6553600;

修改客户端接收的最大数据值。

上例中关联client定义如下：

class WCFStreemTransfersClient : ClientBase<IStreemTransfers>, IStreemTransfers
    {
        public WCFStreemTransfersClient() : base()
        { }

        public WCFStreemTransfersClient(string endpointName)
            : base(endpointName)
        { }

        public WCFStreemTransfersClient(Binding binding, EndpointAddress address)
            : base(binding, address)
        { }

        public byte[] GetPictureFilestreem() {
            return this.Channel.GetPictureFilestreem();
        }
    }

//IStreemTransfers
[ServiceContract]
    public interface IStreemTransfers
    {
        [OperationContract]
        byte[] GetPictureFilestreem();
    }

 

 

2 服务端。

wcf并没有限制服务端发送数据的大小，因此服务端简单实现该服务契约就可以了。

服务契约接口：

[ServiceContract]
    public interface IStreemTransfers
    {
        [OperationContract]
        byte[] GetPictureFilestreem();
    }

 

 

//服务端实现

class Program
    {
        static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(PictureStreemTransfers));
            host.Open();
            Console.WriteLine("服务中");
            Console.Read();
            Console.Read();
        }
    }

//GetPictureFilestreem
public class PictureStreemTransfers : IStreemTransfers
    {
        public byte[] GetPictureFilestreem() {
            try
            {
                string path = System.Environment.CurrentDirectory + "\\test.jpg";
                Console.WriteLine("Server send File = " + path); 
                return File.ReadAllBytes(path);
            }
            catch (Exception ex) { 
                Console.WriteLine("Server Error:" + ex.Message); 
                return null;
            }
        }