C# 处理基类异常

我有一个C#场景- 我必须处理基类中实际发生在派生类中的异常。 我的基类如下所示：

public interface A
{
    void RunA();
}
public class Base
    {
        public static void RunBase(A a)
        {
            try
            {
                a.RunA();
            }
            catch { }
        }
    }

派生类如下所示：

public class B: A
{
        public void RunA()
        {
            try
            {
                //statement: exception may occur here
            }
            catch{}
    }
}

我想处理异常，比如异常C，发生在B中（在上面的//语句中）。 异常处理部分应该在RunBase内部的基类catch中编写。如何做到这一点

public class Base
{
    public static void RunBase(A a)
    {
        try
        {
            a.RunA();
        }
        catch(SomeSpecialTypeOfException ex)
        { 
            // Do exception handling here
        }
    }
}

public class B: A
{
    public void RunA()
    {
        //statement: exception may occur here
        ...

        // Don't use a try-catch block here. The exception
        // will automatically "bubble up" to RunBase (or any other
        // method that is calling RunA).
    }
}

如何做到这一点

public class Base
{
    public static void RunBase(A a)
    {
        try
        {
            a.RunA();
        }
        catch(SomeSpecialTypeOfException ex)
        { 
            // Do exception handling here
        }
    }
}

public class B: A
{
    public void RunA()
    {
        //statement: exception may occur here
        ...

        // Don't use a try-catch block here. The exception
        // will automatically "bubble up" to RunBase (or any other
        // method that is calling RunA).
    }
}

你什么意思只需从

RunA

中删除

try catch

块即可

话虽如此，您需要确保类A知道如何处理异常，这包括将异常简化为UI、日志记录等。。。对于基类来说，这实际上是非常罕见的。处理异常通常发生在UI级别

public class B: A
{
        public void RunA()
        {
            try
            {
                // statement: exception may occur here
            }
            catch(Exception ex)
            {
                // Do whatever you want to do here if you have to do specific stuff
                // when an exception occurs here
                ...

                // Then rethrow it with additional info : it will be processed by the Base class
                throw new ApplicationException("My info", ex);
            }
    }
}

您还可能希望按原样抛出异常（单独使用

throw

）

---

如果您不需要在此处处理任何内容，请不要放置try{}catch{}，让异常自行冒泡并由基类处理。

只需从类B中删除try-catch，如果发生异常，它将启动调用链，直到处理完为止。在这种情况下，可以使用现有的try-catch块在RunBase中处理异常

尽管在您的示例中，B不是从基类派生的。如果您确实想处理在父类的派生类中引发异常的情况，可以尝试以下操作：

public class A
{
    //Public version used by calling code.
    public void SomeMethod()
    {
        try
        {
            protectedMethod();
        }
        catch (SomeException exc)
        {
            //handle the exception.
        }
    }

    //Derived classes can override this version, any exception thrown can be handled in SomeMethod.
    protected virtual void protectedMethod()
    {
    }

}

public class B : A
{
    protected override void protectedMethod()
    {
        //Throw your exception here.
    }
}