自定义行为的配置错误 [英] Configuration Error With Custom Behaviour

问题描述

我创建了一个自定义行为，用于WCF服务将所有错误记录到应用程序日志中。我为行为创建了 BehaviorExtensionElement ：

I've created a custom behaviour for use with a WCF service to log all errors to the application log. I have made a BehaviorExtensionElement for the behaviour:

public ErrorLoggingBehaviorExtensionElement : BehaviorExtensionElement
{
    public ErrorLoggingBehaviorExtensionElement() { }

    /* - Elements removed for brevity - */
}

我试图在我的配置中应用这个，如下：

I am attempting to apply this in my configuration as follows:

<extensions>
  <behaviorExtensions>
    <add name="errorLogging"
         type="ErrorLoggingBehaviorExtensionElement, Logging, Version=1.0.0.0, 
               Culture=neutral, PublicKeyToken=56e8273d901d717f"/>
  </behaviorExtensions>
</extensions>

<services>
  <service name="TestService" behaviorConfiguration="TestServiceBehavior">
    <endpoint address="" 
              binding="wsHttpBinding" 
              contract="Test_Service.ITestService"/>
    <endpoint address="mex" 
              binding="mexHttpBinding" 
              contract="IMetadataExchange"/>
  </service>
</services>

<behaviors>
  <serviceBehaviors>
    <behavior name="TestServiceBehavior">
      <serviceMetadata httpGetEnabled="true"/>
      <errorLogging />
    </behavior>
  </serviceBehaviors>
</behaviors>

行为注册元素上的type属性实际上在我的配置文件中的一行上，以克服 this known issue 。换行符已添加到您的眼睛。

NOTE: The "type" attribute on the behavior registration element is actually on a single line in my configuration file to overcome this known issue. Line-breaks have been added for your eyes.

尝试查看服务页面时会产生以下应用程序错误：

This generates the following application error when trying to view the service page:

为system.serviceModel / behavior创建配置节处理程序时出错：没有为此对象定义的无参数构造函数。

An error occurred creating the configuration section handler for system.serviceModel/behaviors: No parameterless constructor defined for this object.

删除< errorLogging /> 元素会使错误消失，但我无法看到它与

Removing the <errorLogging /> element makes the error disappear, but I can't see how it is related to the error being reported.

推荐答案

问题实际上是在配置元素的子元素内。

The problem is actually deep within the configuration element's child elements.

其中一个配置属性是一个枚举，用 TypeConverterAttribute 装饰以执行从字符串到枚举的转换：

One of the configuration properties was an enumeration, decorated with a TypeConverterAttribute to perform the conversion from string to enumeration:

[ConfigurationProperty("level", IsRequired=false)]
[TypeConverter(typeof(EnumConverter))]
public LogLevel Level
{
    get { ... }
    set { ... }
}

b $ b

抛出的异常实际上指的是类型 EnumConverter 不具有无参数构造函数（实际上它需要枚举的类型转换和从）

The exception being thrown actually refers to the type EnumConverter not having a parameterless constructor (in fact it requires the type of the enumeration to convert to and from).

为了解决这个问题，我切换到在元素的构造函数中创建 ConfigurationProperty ，而不是使用声明模型。在某些时候，我可能会创建一个 EnumConverter< T> 类，以便它可以声明性地使用。

To resolve this, I switched to creating the ConfigurationProperty in the element's constructor instead of using the declarative model. At some point, I will probably create an EnumConverter<T> class so that it can be used declaratively.

这使我有一天的挖掘，最终解决。

This caused me about a day of digging to finally resolve.

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