[英]How to prevent recursive in copying files and dirs?
我遇到了復制文件/目錄的問題。 幾乎整天都在掙扎。 我必須從根目錄文件及其帶有文件和子目錄的目錄復制。 事實上,我已經做了一些事情。 但是,每次我在stackoverflow錯誤中運行。
abstract class SystemOperations {
public virtual void SearchFiles() { }
public virtual void SearchDirectories() { }
public abstract void CreateDirectory(string DIR);
public abstract void CloneContent(string DIR);
public abstract void CreateJSON(string DIR);
public void ExecuteCopying(string DIR) {
CreateDirectory(DIR);
CloneContent(DIR);
CreateJSON(DIR);
}
}
class FileOperations : SystemOperations {
DirectoryInfo _MainPath;
public DirectoryInfo MainPath {
get { return _MainPath; }
set { _MainPath = value; }
}
public FileOperations(DirectoryInfo MainPath) {
this.MainPath = MainPath;
}
#region Unnecessary for current task
public override void SearchFiles() {
string path = "";
FileInfo[] files = MainPath.GetFiles();
foreach (FileInfo file in files) {
path = file.Name;
}
}
public override void SearchDirectories() {
string path = "";
DirectoryInfo[] directories = MainPath.GetDirectories();
foreach (DirectoryInfo directory in directories) {
path = directory.Name;
}
}
#endregion
public override void CreateDirectory(string DIR) {
string newFolder = Path.Combine(MainPath + "", DIR);
Directory.CreateDirectory(newFolder);
}
public override void CloneContent(string DIR) {
foreach (var directory in Directory.GetDirectories(MainPath + "")) {
string dir = Path.GetFileName(directory);
CloneContent(Path.Combine(MainPath + "", dir));
}
foreach (var file in Directory.GetFiles(MainPath + "")) {
File.Copy(file, Path.Combine(MainPath + "", Path.GetFileName(file)), true);
}
}
public override void CreateJSON(string DIR) {
if (!Directory.Exists(DIR)) {
var asd = new DirectoryInfo(DIR);
}
}
}
class Program {
static void Main() {
SystemOperations task = new FileOperations(new DirectoryInfo(@"D:\\LAK"));
task.ExecuteCopying("COPY");
}
}
因此,function CloneContent 必須復制到每個 dir/subdirs 文件中。 但是它的遞歸函數,正如我上面寫的,我遇到了錯誤。 而且不知道如何解決這個問題。 感謝你!
您嘗試確定接下來需要搜索哪個目錄的方式存在某種問題,在我看來,使用 MainPath 是錯誤的。
就我個人而言,我也總是更喜歡使用輔助停止條件來避免 StackOverflowException,就像我在下面使用的 maxrunCount 一樣。
如果您想要遞歸目錄查找,您應該將代碼重寫為類似
void Main()
{
string MainPath = "D:\\LAK";
// unless your directory is actually named \LAK:) you should use either @"D:\LAK" or "d:\\LAK"
CloneContent(MainPath,1000);
}
public void CloneContent(string directoryToSearch, int maxrunCount)
{
if(maxrunCount==0)
return;
System.Diagnostics.Debug.Print(directoryToSearch);
string[] directories = null;
try
{
directories = Directory.GetDirectories(directoryToSearch);
}
catch(UnauthorizedAccessException ex) {
System.Diagnostics.Debug.Print($"No access to dir {directoryToSearch}");
directories = new string[0];
}
// ensure you have access to the current directoryToSearch
foreach (var directory in directories)
{
CloneContent(directory,--maxrunCount);
}
System.Diagnostics.Debug.Print($"cloning {directoryToSearch}");
// .... do the actual cloning here,
// you will end up here when there are no more subdirectories on the current branch
}
要使遞歸方法起作用,它必須至少具有一個“退出”條件——它完成工作並可以展開堆棧的點。 在我們的例子中,當沒有更多的目錄或文件可以從源復制到目標時。
編寫此方法的一種方法是獲取源目錄和目標目錄,然后它可以遞歸地為每個子目錄調用自身:
public static void CloneContent(string sourceDir, string destDir)
{
// If the source directory doesn't exist, return
if (!Directory.Exists(sourceDir)) return;
// Create destination if needed
Directory.CreateDirectory(destDir);
// Copy files from this directory to the new path
foreach (string file in Directory.GetFiles(sourceDir))
{
File.Copy(file, Path.Combine(destDir, Path.GetFileName(file)));
}
// Recursively call this method for each sub directory
foreach (string subDir in Directory.GetDirectories(sourceDir))
{
string dirName = Path.GetFileName(subDir);
string newSource = Path.Combine(sourceDir, dirName);
string newDest = Path.Combine(destDir, dirName);
CloneContent(newSource, newDest);
}
}
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