[英]add extra parameter to ProgressChanged event in C#4
这是我的代码(简单下载器):
public void DownloadFile(string urlAddress, string location)
{
using (webClient = new WebClient())
{
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
Uri URL = urlAddress.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ? new Uri(urlAddress) : new Uri("http://" + urlAddress);
try
{
webClient.DownloadFileAsync(URL, location);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
&这是我的问题:
如何在我的ProgressChanged
事件中添加额外的参数( int RowNumber
)? 我的意思是这样的:
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e, int RowNumber)
{
// Other codes here
}
&这是VS2010给我的错误:
'ProgressChanged'没有重载匹配代表'System.Net.DownloadProgressChangedEventHandler'
我应该重写DownloadProgressChangedEventHandler
吗? 怎么样?!
谢谢你的协助。
您应该更改此:
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
有:
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler((sender, e) => ProgressChanged(sender, e, RowNumber));
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