如何使用 .NET 打開文件以進行非獨占寫入訪問

是否可以在 .NET 中打開具有非獨占寫入訪問權限的文件？如果是這樣，怎麼做？我希望有兩個或多個程序同時寫入同一個文件。

**編輯：**這是這個問題的上下文：我正在為 IIS 編寫一個簡單的日誌記錄 HTTPModule。由於在不同應用程序池中執行的應用程序作為不同的程序執行，因此我需要一種在程序之間共享日誌文件的方法。我可以編寫一個複雜的文件鎖定常式，或者一個懶惰的作家，但這是一個扔掉的項目，所以它並不重要。

這是我用來弄清楚該過程的測試程式碼。

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Threading;

namespace FileOpenTest
{
   class Program
   {
       private static bool keepGoing = true;

       static void Main(string[] args)
       {
           Console.CancelKeyPress += new ConsoleCancelEventHandler(Console_CancelKeyPress);

           Console.Write("Enter name: ");
           string name = Console.ReadLine();
           //Open the file in a shared write mode
           FileStream fs = new FileStream("file.txt", 
                                          FileMode.OpenOrCreate, 
                                          FileAccess.ReadWrite, 
                                          FileShare.ReadWrite);

           while (keepGoing)
           {
               AlmostGuaranteedAppend(name, fs);
               Console.WriteLine(name);
               Thread.Sleep(1000);
           }

           fs.Close();
           fs.Dispose();
       }

       private static void AlmostGuaranteedAppend(string stringToWrite, FileStream fs)
       {
           StreamWriter sw = new StreamWriter(fs);

           //Force the file pointer to re-seek the end of the file.
           //THIS IS THE KEY TO KEEPING MULTIPLE PROCESSES FROM STOMPING
           //EACH OTHER WHEN WRITING TO A SHARED FILE.
           fs.Position = fs.Length;

           //Note: there is a possible race condition between the above
           //and below lines of code. If a context switch happens right
           //here and the next process writes to the end of the common
           //file, then fs.Position will no longer point to the end of
           //the file and the next write will overwrite existing data.
           //For writing periodic logs where the chance of collision is
           //small, this should work.

           sw.WriteLine(stringToWrite);
           sw.Flush();
       }

       private static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
       {
           keepGoing = false;
       }
   }
}

使用File.Open 打開文件時使用FileShare列舉。具體來說，使用 FileShare.ReadWrite。

FileStream 類有一個建構子，它接受多個選項，包括FileShare

new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);

引用自：https://stackoverflow.com/questions/513260