如何从另一个方法返回catch [英] How to return catch from another method

问题描述

我希望能够将我的IsValidEmailDomain方法中的错误捕获到我的test方法中。这有可能实现吗？

I would like to be able catch error from my "IsValidEmailDomain" method into my "test" method. Is this possible to achieve?

public static bool IsValidEmailDomain(MailAddress address)
    {
        if (address == null) return false;

        var response = DnsClient.Default.Resolve(address.Host, RecordType.Mx);
        try
        {
            if (response == null || response.AnswerRecords == null) return false;
        }
        catch (FormatException ex)
        {
            ex.ToString();
            throw ex;
            //return false;
        }

        return response.AnswerRecords.OfType<MxRecord>().Any();
    }

    public static bool IsValidEmailDomain(string address)
    {
        if (string.IsNullOrWhiteSpace(address)) return false;

        MailAddress theAddress;
        try
        {
            theAddress = new MailAddress(address);
        }
        catch (FormatException)
        {
            return false;
        }

        return IsValidEmailDomain(theAddress);
    }

public static string test()
    {
        string mail = "########";
        string error = "notValid";

        if (IsValidEmailDomain(mail))
        {
            return mail;
        }
        else
        {
            ///How to return catch from IsValidEmailDomain() method.
        }

    }

任何提示都会有所帮助。感谢您的时间和帮助。

Any hints would be most helpful. Thank you for your time and help.

推荐答案

您可以将方法更改为：

You can change your method to:

 public static bool IsValidEmailDomain(MailAddress address, out Exception exception) 
{ 
    exception = null;
 ....
  
   // and in case of errors, before return assign it:
            catch (FormatException ex)
            {
                exception = ex.ToString();
                throw ex;
                //return false;
            }   
   .....

在调用函数中使用异常如下： />

The use the exception in the calling function like this:

public static string test()
        {
            string mail = "########";
            string error = "notValid";
            Exception exception = null;

            if (IsValidEmailDomain(mail, out exception))
            {
                return mail;
            }
            else
            {
                ///How to return catch from IsValidEmailDomain() method.
                exception.ToString();
                // Use the exception as you like...
            }
 
        }

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