在c＃中向EventHandler添加一些參數

Question

到現在為止我有這個代碼

public void getRankingList(string country,string type)
    {            
        WebClient client = new WebClient();
        client.AllowReadStreamBuffering = true;
        string url = "......";
        client.DownloadStringCompleted += getRankingResult;
        client.DownloadStringAsync(new Uri(url, UriKind.Absolute));
    }
private void getRankingResult(object sender, DownloadStringCompletedEventArgs e)
    {
        .........
    }

那么我現在可以在downloadCompleted事件中添加一些para嗎？ 就像是：

private void getRankingResult(object sender, DownloadStringCompletedEventArgs e, string Para)
    {
        .........
    }

Answer 1

public void getRankingList(string country,string type)
    {            
        WebClient client = new WebClient();
        client.AllowReadStreamBuffering = true;
        string url = "......";
        client.DownloadStringCompleted += (sender, args) => 
        getRankingResult(sender, args, "para");
        client.DownloadStringAsync(new Uri(url, UriKind.Absolute));
    }

private void getRankingResult(object sender, DownloadStringCompletedEventArgs e, string Para)
{
    // .....
}

Answer 2

如果DownloadStringCompletedEventArgs不是密封類，那么您可以創建一個新類並從中繼承並向其添加附加string Para字段。