c# - 更改 DataServiceContext 中的最大消息大小

Question

我正在使用 DataServiceContext 从托管 dbml 的 wcf 服务获取数据。它通常工作正常，但返回大量数据(例如二进制文件)的查询会产生常见的 WCF 错误:

The maximum message size quota for incoming messages (65536) has been exceeded. To increase the quota, use the MaxReceivedMessageSize property on the appropriate binding 

问题是我找不到更改 channel 消息大小的方法。

这是我用来初始化类的代码:

var channel = new RPDataModelDataContext(DataServiceBaseAddress);
channel.Credentials = CredentialCache.DefaultCredentials;

其中RPDataModelDataContext是用entityframework生成的客户端代理类

public partial class RPDataModelDataContext : 
    global::System.Data.Services.Client.DataServiceContext
{
    // ...

谁能指出我正确的方向？

Answer 1

我在这方面也遇到了很多问题。我遗漏了三个细节。

1. 您必须准确指定服务名称。这应该是完全限定的服务名称。 (即 Namespace.ClassName)

2. 您必须提供端点的准确地址。 (见下面的代码)

   <services>
       <!-- The service name below has to be the EXACT Namespace.ClassName of your WCF Data Service-->
       <service name="YourDomainNameHere.YourClassNameHere">
           <!-- The address below must be the EXACT address of your service-->
           <endpoint address ="http://localhost:19766/YourServiceName.svc" binding="webHttpBinding" bindingConfiguration="higherMessageSize" contract ="System.Data.Services.IRequestHandler">
           </endpoint>
       </service>
   </services>
   

3. 必须指定 maxReceivedMessageSize 和 maxBufferSize

   <bindings>
       <webHttpBinding>
           <!-- The maxReceivedMessageSize and the maxBufferSize must both be specified as shown below-->
           <binding name="higherMessageSize" maxReceivedMessageSize ="2048000" maxBufferSize="2048000"/>
       </webHttpBinding>
   </bindings>