有很多类似的问题，但我已经尝试过每一个解决方案都无济于事。
我们有一个使用WebServiceHostFactory初始化的Web服务，但是如果它被抛出超过64k，我们会收到'400 Bad Request'。通常情况下，这可以通过提升MaxReceivedMessageSize，MaxBufferSize和MaxBufferPoolSize来解决。问题是使用WebServiceHostFactory，Web.Config被完全忽略。我在ServiceModel部分中做的任何更改都不会反映在服务中。
完全放弃WebServiceHostFactory并从头开始设置web.config会很不错，但如果没有它，我们的服务就无法运行。其中一个方法有一个stream参数以及一些其他字符串参数。没有工厂，我们得到
System.InvalidOperationException: For request in operation Test to be a stream the operation must have a single parameter whose type is Stream
因此，不能删除工厂。我无法确切地知道工厂正在做什么修复了这个错误，但是我花了4天时间才完成任务。
我也试过以编程方式覆盖MaxReceivedMessageSize，我在附近找到了一些例子：
protected override void OnOpening()
{
base.OnOpening();
foreach (var endpoint in Description.Endpoints)
{
//var binding = endpoint.Binding as WebHttpBinding;
//if (binding != null)
//{
// binding.MaxReceivedMessageSize = 20000000;
// binding.MaxBufferSize = 20000000;
// binding.MaxBufferPoolSize = 20000000;
// binding.ReaderQuotas.MaxArrayLength = 200000000;
// binding.ReaderQuotas.MaxStringContentLength = 200000000;
// binding.ReaderQuotas.MaxDepth = 32;
//}
//var transport = endpoint.Binding.CreateBindingElements().Find<HttpTransportBindingElement>();
//if (transport != null)
//{
// transport.MaxReceivedMessageSize = 20000000;
// transport.MaxBufferPoolSize = 20000000;
//}
var newTransport = new HttpTransportBindingElement();
newTransport.MaxReceivedMessageSize = 20000000;
newTransport.MaxBufferPoolSize = 20000000;
endpoint.Binding.CreateBindingElements().Add(newTransport);
}
}
第一个不起作用，因为工厂创建了一个无法强制转换为WebHttpBinding的CustomBinding。第二个不起作用，因为看起来绑定元素是只读的 - 无论我将元素设置为什么，没有任何变化，我通过在“更改”它们之后读取值来验证。第三个是尝试在那里抛出一个新的绑定元素的最后尝试，但当然这也失败了。
现在我们完全不知所措。我们怎么能让这个东西运行？你认为它会如此简单！
谢谢你们
的Web.Config
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.web>
<compilation targetFramework="4.0" />
</system.web>
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="rest" maxReceivedMessageSize="500000000" />
</webHttpBinding>
</bindings>
<services>
<service name="SCAPIService" behaviorConfiguration="ServiceBehaviour">
<endpoint address="" binding="webHttpBinding" bindingConfiguration="rest" contract="ISCAPIService" behaviorConfiguration="web">
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehaviour">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="web">
<webHttp />
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
</system.webServer>
</configuration>
使用目前尚未成功的建议修补程序进行编辑：
public class MyServiceHost : WebServiceHost
{
public MyServiceHost()
{
}
public MyServiceHost(object singletonInstance, params Uri[] baseAddresses)
: base(singletonInstance, baseAddresses)
{
}
public MyServiceHost(Type serviceType, params Uri[] baseAddresses)
: base(serviceType, baseAddresses)
{
}
protected override void ApplyConfiguration()
{
base.ApplyConfiguration();
APIUsers.TestString += "here" + Description.Endpoints.Count.ToString();
foreach (var endpoint in this.Description.Endpoints)
{
var binding = endpoint.Binding;
APIUsers.TestString += binding.GetType().ToString();
if (binding is WebHttpBinding)
{
var web = binding as WebHttpBinding;
web.MaxBufferSize = 2000000;
web.MaxBufferPoolSize = 2000000;
web.MaxReceivedMessageSize = 2000000;
}
var myReaderQuotas = new System.Xml.XmlDictionaryReaderQuotas();
myReaderQuotas.MaxStringContentLength = 2000000;
myReaderQuotas.MaxArrayLength = 2000000;
myReaderQuotas.MaxDepth = 32;
binding.GetType().GetProperty("ReaderQuotas").SetValue(binding, myReaderQuotas, null);
}
}
}
class MyWebServiceHostFactory : WebServiceHostFactory
{
protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
return new MyServiceHost(serviceType, baseAddresses);
}
}
答案 0 :(得分：7)
为了他人的利益，上面的答案沿着正确的道路走下去，但是它有很多错误，如果没有改变就无法工作（因此OP无法使解决方案起作用）。使用以下内容，它将为您“开箱即用”。
注意 - 提供以下所有构造函数并使用工厂中演示的构造函数重载非常非常重要，否则您将收到以下错误消息：
InitializeRuntime要求初始化Description属性。在CreateDescription方法中提供有效的ServiceDescription或覆盖InitializeRuntime方法以提供替代实现
自定义ServiceHost实现：
public class CustomServiceHost : ServiceHost
{
public CustomServiceHost()
{
}
public CustomServiceHost(object singletonInstance, params Uri[] baseAddresses) : base(singletonInstance, baseAddresses)
{
}
public CustomServiceHost(Type serviceType, params Uri[] baseAddresses) : base(serviceType, baseAddresses)
{
}
protected override void OnOpening()
{
base.OnOpening();
foreach (var endpoint in this.Description.Endpoints)
{
var binding = endpoint.Binding;
var web = binding as WebHttpBinding;
if (web != null)
{
web.MaxBufferSize = 2147483647;
web.MaxReceivedMessageSize = 2147483647;
}
var myReaderQuotas = new XmlDictionaryReaderQuotas { MaxStringContentLength = 2147483647 };
binding.GetType().GetProperty("ReaderQuotas").SetValue(binding, myReaderQuotas, null);
}
}
}
自定义ServiceHostFactory实现：
public sealed class CustomServiceHostFactory : ServiceHostFactory
{
protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
return new CustomServiceHost(serviceType, baseAddresses);
}
}
只要类型正确，上面的Service1.svc标记就会起作用。我实际上使用这种技术来覆盖WebServiceHost并允许更大的JSON响应大小，但原则也应该都适用于ServiceHost。
答案 1 :(得分：3)
如果要实现自己的自定义服务主机，则应该能够覆盖名为“ApplyConfiguration”的方法，您可以在其中关联绑定所需的所有配置属性。一些示例代码如下所示：
编辑：添加我的servicehost工厂实现
public class MyServiceHost : System.ServiceModel.ServiceHost
{
public MyServiceHost () { }
public MyServiceHost (Type serviceType, params Uri[] baseAddresses) : base(serviceType, baseAddresses)
{
}
public MyServiceHost (object singletonInstance, params Uri[] baseAddresses) : base(singletonInstance, baseAddresses)
{
}
protected override void ApplyConfiguration()
{
Console.WriteLine("ApplyConfiguration (thread {0})", System.Threading.Thread.CurrentThread.ManagedThreadId);
base.ApplyConfiguration();
foreach (ServiceEndpoint endpoint in this.Description.Endpoints)
{
Binding binding = endpoint.Binding;
var binding = endpoint.Binding;
if(binding is WebHttpBinding)
{
var web = binding as WebHttpBinding;
web.MaxBufferSize = 2000000;
web.MaxReceivedMessageSize = 2000000;
}
var myReaderQuotas = new XmlDictionaryReaderQuotas();
myReaderQuotas.MaxStringContentLength = 5242880;
binding.GetType().GetProperty("ReaderQuotas").SetValue(binding, myReaderQuotas, null);
}
}
}
上面的内容会覆盖每个绑定的配置并设置MaxStringContentLength。
public sealed class MyServiceHostFactory : System.ServiceModel.Activation.ServiceHostFactory
{
public override System.ServiceModel.ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
{
return base.CreateServiceHost(constructorString, baseAddresses);
}
protected override System.ServiceModel.ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
return new MyServiceHost(serviceType, baseAddresses);
}
}
现在我的Service.svc文件标记有这个：
<%@ ServiceHost Language="C#" Debug="true" Factory="Sample.MyServiceHostFactory" Service="Sample.ReaderQuotasService" CodeBehind="ReaderQuotasService.svc.cs" %>