c#将文件从源文件夹复制到目标文件夹

本文关键字：文件夹 复制 目标 源文件 文件 | 更新日期: 2023-09-27 18:25:58

源和目标有相同的子目录，如下所示：

c： ''fs''source''a''
c： ''fs''source''b''

c： ''fs''target''a''
c： ''fs''target''b''

我正在努力将文件从源文件复制到目标文件（如果不是现有文件的话）。C#中比较源文件夹和目标文件夹的最佳方法是什么？检查目标文件是否不退出，将文件从特定源（C:''fs''source''a''config.xml和app.config）复制到特定目标（C:''fs''target''a''）。如果目标文件存在，忽略它。如何用C#编写它？

非常感谢您的代码示例。谢谢

    public void TargetFileCreate()
    {
        foreach (var folder in SourceFolders)
        {
            string[] _sourceFileEntries = Directory.GetFiles(folder);
            foreach (var fileName in _sourceFileEntries)
            {    //dont know how to implement here:
                 //how to compare source file to target file to check if files exist or not
                 //c:'fs'source'A'config.xml compares to c:'fs'target'A' (no files) that should be pasted
                 //c:'fs'source'B'config.xml compares to c:'fs'target'B'config.xml that is already existed - no paste
            }
        }
    }

c#将文件从源文件夹复制到目标文件夹

foreach (var file in Directory.GetFiles(source))
{
    File.Copy(file, Path.Combine(target, Path.GetFileName(file)), false);
}

您可以通过以下方式检查每个文件是否存在：

string curFile = @"c:'temp'test.txt";
Console.WriteLine(File.Exists(curFile) ? "File exists." : "File does not exist.");

把这个放在你的圈子里。然后把这些文件复制到那里。

MSDN代码：

// Simple synchronous file copy operations with no user interface. 
// To run this sample, first create the following directories and files: 
// C:'Users'Public'TestFolder 
// C:'Users'Public'TestFolder'test.txt 
// C:'Users'Public'TestFolder'SubDir'test.txt 
public class SimpleFileCopy
{
    static void Main()
    {
        string fileName = "test.txt";
        string sourcePath = @"C:'Users'Public'TestFolder";
        string targetPath =  @"C:'Users'Public'TestFolder'SubDir";
        // Use Path class to manipulate file and directory paths. 
        string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
        string destFile = System.IO.Path.Combine(targetPath, fileName);
        // To copy a folder's contents to a new location: 
        // Create a new target folder, if necessary. 
        if (!System.IO.Directory.Exists(targetPath))
        {
            System.IO.Directory.CreateDirectory(targetPath);
        }
        // To copy a file to another location and  
        // overwrite the destination file if it already exists.
        System.IO.File.Copy(sourceFile, destFile, true);
        // To copy all the files in one directory to another directory. 
        // Get the files in the source folder. (To recursively iterate through 
        // all subfolders under the current directory, see 
        // "How to: Iterate Through a Directory Tree.")
        // Note: Check for target path was performed previously 
        //       in this code example. 
        if (System.IO.Directory.Exists(sourcePath))
        {
            string[] files = System.IO.Directory.GetFiles(sourcePath);
            // Copy the files and overwrite destination files if they already exist. 
            foreach (string s in files)
            {
                // Use static Path methods to extract only the file name from the path.
                fileName = System.IO.Path.GetFileName(s);
                destFile = System.IO.Path.Combine(targetPath, fileName);
                System.IO.File.Copy(s, destFile, true);
            }
        }
        else
        {
            Console.WriteLine("Source path does not exist!");
        }
        // Keep console window open in debug mode.
        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    }
}

foreach (var file in Directory.GetFiles(source))
{
   var targetFile = System.IO.Path.Combine(target, System.IO.Path.GetFileName(file));
   if(!File.Exists(targetFile))
   {
       File.Copy(file, targetFile)
   }
}
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