该进程无法访问该文件，因为它正在被另一个进程使用（文件已创建，但不包含任何内容） [英] The process cannot access the file because it is being used by another process (File is created but contains nothing)

问题描述

 使用System.IO; 
 
 class test 
 {
 public static void Main（）
 {
 
 string path = @c：\mytext.txt ; 
 
 if（File.Exists（path））
 {
 File.Delete（path）; 
} 
 
 
 FileStream fs = new FileStream（path，FileMode.OpenOrCreate）; 
 StreamWriter str = new StreamWriter（fs）; 
 str.BaseStream.Seek（0，SeekOrigin.End）; 
 str.Write（mytext.txt .........................）; 
 str.WriteLine（DateTime.Now.ToLongTimeString（）++ DateTime.Now.ToLongDateString（））; 
 string addtext =这一行被添加+ Environment.NewLine; 
 File.AppendAllText（path，addtext）; //发生异常?????????? 
 string readtext = File.ReadAllText（path）; 
 Console.WriteLine（readtext）; 
 str.Flush（）; 
 str.Close（）; 
 
 Console.ReadKey（）; 
 //System.IO.IOException：进程无法访问文件c：\mytext.txt，因为//被另一个进程使用。 
 //在System.IO .__ Error.WinIOError（Int32 errorCode，String maybeFullPath）
 
} 
} 
  

$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ string path = @c：\mytext.txt;

if（File.Exists（path））
{
File.Delete（path）;
}

{//考虑文件操作1
FileStream fs = new FileStream（path，FileMode.OpenOrCreate）;
StreamWriter str = new StreamWriter（fs）;
str.BaseStream.Seek（0，SeekOrigin.End）;
str.Write（mytext.txt .........................）;
str.WriteLine（DateTime.Now.ToLongTimeString（）++
DateTime.Now.ToLongDateString（））;
string addtext =这一行被添加+ Environment.NewLine;
str.Flush（）;
str.Close（）;
fs.Close（）;
//关闭流然后单独您可以访问文件。
}

File.AppendAllText（path，addtext）; //文件操作2

string readtext = File.ReadAllText（path）; //文件操作3

Console.WriteLine（readtext）;

在每个文件操作中，文件将被打开并且在打开之前必须关闭。就像操作1中的明智一样，您必须关闭进一步操作的文件流。

using System.IO;

class test
{
    public static void Main()
    {

        string path=@"c:\mytext.txt";

        if(File.Exists(path))
        {
            File.Delete(path);
        }


        FileStream fs=new FileStream(path,FileMode.OpenOrCreate);
        StreamWriter str=new StreamWriter(fs);
        str.BaseStream.Seek(0,SeekOrigin.End); 
        str.Write("mytext.txt.........................");
        str.WriteLine(DateTime.Now.ToLongTimeString()+" "+DateTime.Now.ToLongDateString());
        string addtext="this line is added"+Environment.NewLine;
        File.AppendAllText(path,addtext);  //Exception occurrs ??????????
        string readtext=File.ReadAllText(path);
        Console.WriteLine(readtext);
        str.Flush();
        str.Close();

        Console.ReadKey();
  //System.IO.IOException: The process cannot access the file 'c:\mytext.txt' because it is //being used by another process.
  // at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

    }
}

解决方案

Try This

string path = @"c:\mytext.txt";

if (File.Exists(path))
{
    File.Delete(path);
}

{ // Consider File Operation 1
    FileStream fs = new FileStream(path, FileMode.OpenOrCreate);
    StreamWriter str = new StreamWriter(fs);
    str.BaseStream.Seek(0, SeekOrigin.End);
    str.Write("mytext.txt.........................");
    str.WriteLine(DateTime.Now.ToLongTimeString() + " " + 
                  DateTime.Now.ToLongDateString());
    string addtext = "this line is added" + Environment.NewLine;
    str.Flush();
    str.Close();
    fs.Close();
    // Close the Stream then Individually you can access the file.
}

File.AppendAllText(path, addtext);  // File Operation 2

string readtext = File.ReadAllText(path); // File Operation 3

Console.WriteLine(readtext);

In every File Operation, The File will be Opened and must be Closed prior Opened. Like wise in the Operation 1 you must Close the File Stream for the Further Operations.

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