進程使用的C＃檢查文件

Question

讓我有打開文件並追加內容的程序。 如果我應該運行兩個apllication，我會得到另一個進程使用的IOException文件。如何檢查Log.txt文件正在被另一個進程使用？

class Program 
{ 
    static void Main(string[] args) 
    { 
     FileInfo file = new FileInfo(@"D:\Log.txt"); 
     using (StreamWriter sw = file.AppendText()) 
     { 
      for (int i = 0; i < 1000; i++) 
      { 
       System.Threading.Thread.Sleep(100); 
       sw.WriteLine("Hello"); 
       sw.WriteLine("And"); 
       sw.WriteLine("Welcome"); 
      } 
      Console.WriteLine("The work is done"); 
     } 
    } 
} 

Answer 1

您應該嘗試打開並寫入文件。如果它正在使用中，你會得到一個異常。在.NET中沒有其他方式。

protected virtual bool IsFileLocked(FileInfo file) 
{ 
    FileStream stream = null; 

    try 
    { 
     stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None); 
    } 
    catch (IOException) 
    { 
     //the file is unavailable because it is: 
     //still being written to 
     //or being processed by another thread 
     //or does not exist (has already been processed) 
     return true; 
    } 
    finally 
    { 
     if (stream != null) 
      stream.Close(); 
    } 

    //file is not locked 
    return false; 
}