在左邊的螢屏截圖中，我在 textBox 文本上得到了什么，而右邊是單擊繼續按鈕時的例外。
創建檔案夾的方法代碼：
private void CreateDownloadFolders()
{
string locationToCreateFolderRadar = textBoxRadarPath.Text;
string locationToCreateFolderSatellite = textBoxSatellitePath.Text;
string folderName = "";
string date = DateTime.Now.ToString("ddd MM.dd.yyyy");
string time = DateTime.Now.ToString("HH.mm tt");
string format = "{0} on {1} At {2}";
folderName = string.Format(format, date, time);
Directory.CreateDirectory(locationToCreateFolderRadar folderName);
Directory.CreateDirectory(locationToCreateFolderSatellite folderName);
}
呼叫 CreateDownloadFolders 方法的按鈕單擊事件：
private async void btnStart_Click(object sender, EventArgs e)
{
CreateDownloadFolders();
urls = new List<string>();
lblStatus.Text = "Downloading...";
rad.GetRadarImages();
await Task.Delay(5000);
foreach (string link in rad.links)
{
urls.Add(link);
}
await sat.DownloadSatelliteAsync();
foreach (string link in sat.SatelliteUrls())
{
urls.Add(link);
}
urlsCounter = urls.Count;
await DownloadAsync();
}
也許是因為按鈕單擊事件是異步型別的？
uj5u.com熱心網友回復：
您的問題在這一行：
folderName = string.Format(format, date, time);
您只發送兩個引數，格式為 3：
string format = "{0} on {1} At {2}";
你有兩種方法可以解決這個問題：
1：
string format = "{0} on {1} At {2}"; // expect only 2 parameters
或者
2：
folderName = string.Format(format, date, time, "something else"); // send all 3 parameters
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