C＃未經授權的訪問異常

Question

嘗試打開文件時出現未授權訪問異常

 public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        short numberOfLines = Int16.Parse(textBox1.Text);
        webBrowser = new WebBrowser[numberOfLines];
        if (!Directory.Exists(logPath))
        {
            System.IO.Directory.CreateDirectory(logPath);
        }
        for (short i = 0; i < numberOfLines; i++)
        {
            System.IO.StreamWriter file = new System.IO.StreamWriter(logPath);
            runBrowserThread(i);
        }
    }  

它說，訪問路徑被拒絕。 問題可能在哪里？

Answer 1

該代碼試圖像寫入文件一樣寫入目錄。

嘗試使用引用目錄的文件路徑創建文件時，系統將顯示UnauthorizedAccessException 。

if (!Directory.Exists(logPath))
{
    System.IO.Directory.CreateDirectory(logPath);
}
for (short i = 0; i < numberOfLines; i++)
{
    System.IO.StreamWriter file = new System.IO.StreamWriter(logPath);
    runBrowserThread(i);
}

logPath變量引用目錄的路徑，而不是文件的路徑。 要創建文件，您可以執行以下操作...

string logPath = @"c:\Logs";
string logFile = Path.Combine(logPath, DateTime.UtcNow.ToString("HH-mm-ss") + ".log");

// Directory.CreateDirectory(logPath);

using (TextWriter writer = new StreamWriter(logFile))
{
    writer.WriteLine("testing random log");
}

// Process.Start(logFile);