使用自定义异常类引发多个异常

Question

当发生错误时，我想抛出大约 20 条可能的异常消息。 捕获异常时我需要这样的东西

Try
    ' do domthing
Catch ex As CustomInvalidArgumentException
     'do domthing
Catch ex As CustomUnexcpectedException
     'do domthing
Catch ex As Exception
     'do domthing
End Try

目前我有这样的课程

<Serializable()> _
Public Class CustomException
    Inherits Exception

    Public Sub New()
        MyBase.New()
    End Sub

    Public Sub New(ByVal message As String)
        MyBase.New(message)
    End Sub

    Public Sub New(ByVal format As String, ByVal ParamArray args As Object())
        MyBase.New(String.Format(format, args))
    End Sub

    Public Sub New(ByVal message As String, ByVal innerException As Exception)
        MyBase.New(message, innerException)
    End Sub

    Public Sub New(ByVal format As String, ByVal innerException As Exception, ByVal ParamArray args As Object())
        MyBase.New(String.Format(format, args), innerException)
    End Sub

    Protected Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        MyBase.New(info, context)
    End Sub
End Class

我是否必须为每种类型的异常创建一个继承自 Exception 的类

Answer 1

不，您不需要让each 异常类直接 继承自Exception。但是您需要确保所有您自定义的异常可以通过父层次结构从Exception 派生。例如，看下面的继承树：

例外 | |-MyGenericException | |-MyFooException | |-MyBarException | |-其他通用异常 |-OtherFooException |-OtherBarException

请注意，某些异常类不直接继承自 Exception，但是它们有一个父类，实际上，该父类派生自 Exception。

示例代码是用记事本编写的 C# 代码，但希望您能理解。

另外 2 个通用异常类继承自 Exception。它们是MyIOException 和MySecurityException。其他四个不太通用的类派生自它们。

//------------ Networking
public class MyIOException : Exception
{
    public string AdditionalData {get; set;}
}
public class MyNetworkFailureIOException : MyIOException
{
    public string Reason {get; set;}
}
public class MyRemoteFileNotFoundIOException : MyIOException
{
    public string RemotePath {get; set;}
}

//------------ Security
public class MySecurityException : Exception
{
    public string UserName {get; set;}
}
public class MyAccessDeniedException : MySecurityException
{
    public string PolicyName {get; set;}
}
public class MyUnauthorizedException : MySecurityException
{
    public string CodeName {get; set;}
}