复制文件时如何防止此System.IO.IOException？ [英] How do I prevent this System.IO.IOException when copying a file?

问题描述

当我运行以下代码来测试复制目录时，在调用fileInfo.CopyTo方法时会出现System.IO.IOException。错误消息是：进程无法访问文件'C：\CopyDirectoryTest1 \ temp.txt'，因为它正由另一个进程使用。

似乎在file1（C：\CopyDirectoryTest1 \ temp.txt）上有一个锁定，它在错误发生的上面几行创建，但如果是这样的话，我不知道如何释放它。任何想法？

 使用System; 
使用System.IO; 
 
 namespace TempConsoleApp 
 {
 class program 
 {
 static void Main（string [] args）
 {
 string folder1 = @C：\CopyDirectoryTest1; 
 string folder2 = @C：\CopyDirectoryTest2; 
 string file1 = Path.Combine（folder1，temp.txt）; 
 
 if（Directory.Exists（folder1））
 Directory.Delete（folder1，true）; 
 if（Directory.Exists（folder2））
 Directory.Delete（folder2，true）; 
 
 Directory.CreateDirectory（folder1）; 
 Directory.CreateDirectory（folder2）; 
 File.Create（file1）; 
 
 DirectoryInfo folder1Info = new DirectoryInfo（folder1）; 
 DirectoryInfo folder2Info = new DirectoryInfo（folder2）; 
 
 foreach（fileInfo fileInfo in folder1Info.GetFiles（））
 {
 string fileName = fileInfo.Name; 
 string targetFilePath = Path.Combine（folder2Info.FullName，fileName）; 
 fileInfo.CopyTo（targetFilePath，true）; 
} 
} 
} 
} 
  

解决方案

File.Create 返回一个打开的 FileStream - 您需要关闭该流。

仅

使用（File.Create（file1））{}

应该这样做。

When I run the following code to test copying a directory, I get a System.IO.IOException when fileInfo.CopyTo method is being called. The error message is: "The process cannot access the file 'C:\CopyDirectoryTest1\temp.txt' because it is being used by another process."

It seems like there's a lock on file1 ("C:\CopyDirectoryTest1\temp.txt") which is created a few lines above where the error is occurring, but I don't know how to release this if so. Any ideas?

using System;
using System.IO;

namespace TempConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            string folder1 = @"C:\CopyDirectoryTest1";
            string folder2 = @"C:\CopyDirectoryTest2";
            string file1 = Path.Combine(folder1, "temp.txt");

            if (Directory.Exists(folder1))
                Directory.Delete(folder1, true);
            if (Directory.Exists(folder2))
                Directory.Delete(folder2, true);

            Directory.CreateDirectory(folder1);
            Directory.CreateDirectory(folder2);
            File.Create(file1);

            DirectoryInfo folder1Info = new DirectoryInfo(folder1);
            DirectoryInfo folder2Info = new DirectoryInfo(folder2);

            foreach (FileInfo fileInfo in folder1Info.GetFiles())
            {
                string fileName = fileInfo.Name;
                string targetFilePath = Path.Combine(folder2Info.FullName, fileName);
                fileInfo.CopyTo(targetFilePath, true);
            }
        }
    }
}

解决方案

File.Create returns an open FileStream - you need to close that stream.

Just

using (File.Create(file1)) {}

should do the trick.

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