Source和Target具有相同的子目录:
c:\ fs \ source \ a \
C:\ FS \源\ B \
c:\ fs \ target \ a \
C:\ FS \目标\ B \
如果不是现有文件,我正在努力将文件从源复制到目标。 C#将源文件夹与目标文件夹进行比较的最佳方法是 - 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 \目标\一个\)。如果存在目标文件,请忽略它。如何用C#编写?
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
}
}
}
答案 0 :(得分:2)
foreach (var file in Directory.GetFiles(source))
{
File.Copy(file, Path.Combine(target, Path.GetFileName(file)), false);
}
答案 1 :(得分:1)
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)
}
}
答案 2 :(得分:0)
如果每个文件都存在,您可以检查它们:
string curFile = @"c:\temp\test.txt";
Console.WriteLine(File.Exists(curFile) ? "File exists." : "File does not exist.");
把它放在你的循环中。然后在那里复制那些文件。
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();
}
}