无法将类型“ void”隐式转换为“ int”？ [英] Cannot implicitly convert type 'void' to 'int'?

问题描述

好吧，所以我对编程还很陌生，我不明白为什么会出现此错误。

Oke so I am fairly new to programming and I don't get why I get this error.

我的方法应该存储在此方法中执行的邮件：

My method should store mails which it does in this method:

    public void StoreMail(PhishingMail PhishingMail)
    {
        using (var phishingMailStorage = new PhishFinderModel())
        {
            phishingMailStorage.PhishingMail.Attach(PhishingMail);

            phishingMailStorage.SaveChanges();

        }

然后在我的processPhishingMail方法中，它调用Store方法。但是然后我得到一个错误：无法将类型'void'隐式转换为'int'。

And then in my processPhishingMail method it calls the Store method. But then I get the error: Cannot implicitly convert type 'void' to 'int'.

public void ProcessPhishingMail(PhishingMail phishingMail)
{                     
      Hashtable phishingUrls;
      int phishingMailId;
      int phishingUrlId;
      //Error convertion
      phishingMailId = _storageAgent.StoreMail(phishingMail);

所以我真的找不到找到将void转换为int的解决方案。也许不可能吗？

So I can't really find a solution to convert from void to int. Maybe it's not possible?

我的问题是：如何在代码中转换这些类型？

My question is: how do I convert these types in my code?

请不要太苛刻我真的很陌生。感觉就像我在信息海洋中畅游，不知道在哪里寻找或开始。因此，任何建议的教程都是非常受欢迎的。

Please don't be harsh I am really new to this. It feels like I am swimming in an ocean of information and I don't know where to look or start. So any suggested tutorials are very welcome.

推荐答案

方法

public void StoreMail（PhishingMail PhishingMail）

不返回任何值。因此，当您这样做时：

is not returning any value. So when you do:

phishingMailId = _storageAgent.StoreMail（phishingMail）;

您将收到此错误，因为 StoreMail 被声明为 void ，这意味着不会返回任何内容。

You are getting that error, since StoreMail is declared as void, which means it does not return anything.

要解决此问题，只需像这样调用 StoreMail ：

To fix this, simply call StoreMail like this:

_storageAgent.StoreMail（phishingMail）;

如果要从中返回值 StoreMail ，则必须更改它以返回 int 值：

If you intend to return a value from StoreMail, then you must change it to return an int value:

public int StoreMail(PhishingMail PhishingMail)
{
    using (var phishingMailStorage = new PhishFinderModel())
    {
        phishingMailStorage.PhishingMail.Attach(PhishingMail);

        phishingMailStorage.SaveChanges();
    }

    return someIdWhichYouNeedToFigureOut;
}

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