C# 为什么调用ExceptionPolicy.HandleException时会得到System.InvalidOperationException?
我正在编写一个测试程序,帮助我了解如何使用Microsoft.Practices.EnterpriseLibrary.ExceptionHandling框架。程序定义了几种自定义异常类型,并将自定义异常处理程序与每种类型相关联。在运行时,程序会提示用户输入要引发的异常类型,引发异常,并使用ExceptionHandling框架为异常类型调用适当的异常处理程序:C# 为什么调用ExceptionPolicy.HandleException时会得到System.InvalidOperationException?,c#,exception,exception-handling,enterprise-library,C#,Exception,Exception Handling,Enterprise Library,我正在编写一个测试程序,帮助我了解如何使用Microsoft.Practices.EnterpriseLibrary.ExceptionHandling框架。程序定义了几种自定义异常类型,并将自定义异常处理程序与每种类型相关联。在运行时,程序会提示用户输入要引发的异常类型,引发异常,并使用ExceptionHandling框架为异常类型调用适当的异常处理程序: using System; using System.Collections.Specialized; using Microsoft.
using System;
using System.Collections.Specialized;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.ExceptionHandling;
using Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration;
namespace ConsoleApplication1
{
public class AException : Exception { public AException(string message) : base(message) { } }
public class BException : Exception { public BException(string message) : base(message) { } }
public class BBException : BException { public BBException(string message) : base(message) { } }
public class WrapperException : Exception
{
public WrapperException(Exception innerException)
: base("Wrapped exception: [" + innerException.Message + "]", innerException) { }
}
public class MyExceptionHandler<T> : IExceptionHandler
{
protected NameValueCollection Ignore { get; set; }
public MyExceptionHandler(NameValueCollection ignore)
{
Ignore = ignore;
}
#region IExceptionHandler Members
public virtual Exception HandleException(Exception exception, Guid handlingInstanceId)
{
if (exception is T)
{
Console.WriteLine("Exception Handled:");
Console.WriteLine(" Expected Type : [{0}]", typeof(T).ToString());
Console.WriteLine(" Actual Type : [{0}]", exception.GetType().ToString());
Console.WriteLine(" Message : [{0}]", exception.Message);
Console.WriteLine();
}
else
{
Console.WriteLine("Unexpected Exception Type: [{0}]", exception.GetType().ToString());
}
return exception;
}
#endregion
}
[ConfigurationElementType(typeof(CustomHandlerData))]
public class AExceptionHandler : MyExceptionHandler<AException>
{
public AExceptionHandler(NameValueCollection ignore) : base(ignore) { }
}
[ConfigurationElementType(typeof(CustomHandlerData))]
public class BExceptionHandler : MyExceptionHandler<BException>
{
public BExceptionHandler(NameValueCollection ignore) : base(ignore) { }
}
[ConfigurationElementType(typeof(CustomHandlerData))]
public class ExceptionHandler : MyExceptionHandler<Exception>
{
public ExceptionHandler(NameValueCollection ignore) : base(ignore) { }
public override Exception HandleException(Exception exception, Guid handlingInstanceId)
{
var wrapper = new WrapperException(exception);
return base.HandleException(wrapper, handlingInstanceId);
}
}
class Program
{
static void ThrowSomething()
{
Console.Write("Enter the exception type: ");
var x = Console.ReadLine();
if (x.Equals("a"))
{
throw new AException(x);
}
else if (x.Equals("b"))
{
throw new BException(x);
}
else if (x.Equals("bb"))
{
throw new BBException(x);
}
else
{
throw new Exception(x);
}
}
static void Main(string[] args)
{
ExceptionManager xm = EnterpriseLibraryContainer.Current.GetInstance<ExceptionManager>();
while (true)
{
//xm.Process(ThrowSomething, "Policy");
try
{
ThrowSomething();
}
catch(Exception ex)
{
Exception exToThrow = null;
if (ExceptionPolicy.HandleException(ex, "policy", out exToThrow))
{
if (exToThrow == null)
{
throw;
}
else
{
throw exToThrow;
}
}
}
Console.WriteLine();
}
}
}
}
使用系统;
使用System.Collections.Specialized;
使用Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
使用Microsoft.Practices.EnterpriseLibrary.ExceptionHandling;
使用Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration;
命名空间控制台应用程序1
{
公共类AEException:异常{public AEException(字符串消息):基(消息){}
公共类BeException:异常{public BeException(字符串消息):基(消息){}
公共类BBException:BeException{public BBException(字符串消息):基(消息){}
公共类包装器异常:异常
{
公共包装器异常(异常innerException)
:base(“包装异常:[“+innerException.Message+“]”,innerException){}
}
公共类MyExceptionHandler:IEExceptionHandler
{
受保护的NameValueCollection忽略{get;set;}
公共MyExceptionHandler(NameValueCollection忽略)
{
忽略=忽略;
}
#区域IEExceptionHandler成员
公共虚拟异常HandleException(异常异常,Guid handlingInstanceId)
{
如果(例外情况为T)
{
WriteLine(“异常处理:”);
WriteLine(“预期类型:[{0}]”,typeof(T).ToString();
WriteLine(“实际类型:[{0}]”,exception.GetType().ToString());
WriteLine(“Message:[{0}]”,exception.Message);
Console.WriteLine();
}
其他的
{
WriteLine(“意外异常类型:[{0}]”,Exception.GetType().ToString());
}
返回异常;
}
#端区
}
[ConfigurationElementType(typeof(CustomHandlerData))]
公共类AEExceptionHandler:MyExceptionHandler
{
公共AEExceptionHandler(NameValueCollection忽略):基(忽略){}
}
[ConfigurationElementType(typeof(CustomHandlerData))]
公共类BeExceptionHandler:MyExceptionHandler
{
公共BeExceptionHandler(NameValueCollection忽略):基(忽略){}
}
[ConfigurationElementType(typeof(CustomHandlerData))]
公共类ExceptionHandler:MyExceptionHandler
{
PublicExceptionHandler(NameValueCollection忽略):基(忽略){}
公共重写异常HandleException(异常异常,Guid handlingInstanceId)
{
var wrapper=newwrapperexception(异常);
返回base.HandleException(包装器,handlingInstanceId);
}
}
班级计划
{
静态空隙通过某物()
{
编写(“输入异常类型:”);
var x=Console.ReadLine();
如果(x等于(“a”))
{
抛出新的AEException(x);
}
如果(x等于(“b”))
{
抛出新的异常(x);
}
如果(x等于(“bb”))
{
抛出新异常(x);
}
其他的
{
抛出新异常(x);
}
}
静态void Main(字符串[]参数)
{
ExceptionManager xm=EnterpriseLibraryContainer.Current.GetInstance();
while(true)
{
//xm.过程(通过某种方式,“策略”);
尝试
{
Throuwsomething();
}
捕获(例外情况除外)
{
异常抛出=null;
if(例外策略.处理例外(例如,“策略”,out))
{
if(throw==null)
{
投掷;
}
其他的
{
投掷,投掷;
}
}
}
Console.WriteLine();
}
}
}
}
在这个程序的第一次迭代中,我使用ExceptionManager.Process()方法调用ThrowSomething()方法。使用这种方法,一切都很顺利。然后我修改了Main,改为使用ExceptionPolicy.HandleException()。当我这样做的时候,我开始得到这个异常:
未处理的异常:
Microsoft.Practices.ServiceLocation.ActivationException:激活
尝试获取类型的实例时出错
例外PolicyImpl,关键“策略”-->
Microsoft.Practices.Unity.ResolutionFailedException:解决
依赖项失败,类型为=
“Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionPolicyImpl”,
名称
=“政策”。解析时发生异常。异常为:InvalidOperationException-类型ExceptionPolicyImpl具有多个
长度为2的构造函数。无法消除歧义
My App.config文件包含以下内容:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Policy">
<exceptionTypes>
<add name="AException" type="ConsoleApplication1.AException, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
postHandlingAction="None">
<exceptionHandlers>
<add type="ConsoleApplication1.AExceptionHandler, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
name="AExceptionHandler" />
</exceptionHandlers>
</add>
<add name="BException" type="ConsoleApplication1.BException, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
postHandlingAction="None">
<exceptionHandlers>
<add type="ConsoleApplication1.BExceptionHandler, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
name="BExceptionHandler" />
</exceptionHandlers>
</add>
<add name="All Other Exceptions" type="System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
postHandlingAction="NotifyRethrow">
<exceptionHandlers>
<add type="ConsoleApplication1.ExceptionHandler, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
name="ExceptionHandler" />
</exceptionHandlers>
</add>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>
if (ExceptionPolicy.HandleException(ex, "policy", out exToThrow))
if (ExceptionPolicy.HandleException(ex, "Policy", out exToThrow))