public:
static void Copy(System::String ^ sourceFileName, System::String ^ destFileName, bool overwrite);
public static void Copy (string sourceFileName, string destFileName, bool overwrite);
static member Copy : string * string * bool -> unit
Public Shared Sub Copy (sourceFileName As String, destFileName As String, overwrite As Boolean)
ArgumentException
sourceFileName
或
destFileName
為零長度字串，只包含空格或包含一或多個無效字元。 您可以使用
GetInvalidPathChars()
方法查詢無效字元。
sourceFileName
或
destFileName
會指定目錄。
下列範例會將檔案複製到 C：\archives\2008 備份資料夾。 它會使用 方法的兩個
Copy
多載，如下所示：
它會先使用
File.Copy(String, String)
方法多載來複製 (.txt) 檔案的文字。 此程式代碼示範此多載不允許覆寫已複製的檔案。
然後，
File.Copy(String, String, Boolean)
它會使用 方法多載來複製圖片 (.jpg 檔案) 。 此程式代碼示範此多載確實允許覆寫已複製的檔案。
string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";
string[] picList = Directory.GetFiles(sourceDir, "*.jpg");
string[] txtList = Directory.GetFiles(sourceDir, "*.txt");
// Copy picture files.
foreach (string f in picList)
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true);
// Copy text files.
foreach (string f in txtList)
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
// Catch exception if the file was already copied.
catch (IOException copyError)
Console.WriteLine(copyError.Message);
// Delete source files that were copied.
foreach (string f in txtList)
File.Delete(f);
foreach (string f in picList)
File.Delete(f);
catch (DirectoryNotFoundException dirNotFound)
Console.WriteLine(dirNotFound.Message);
let sourceDir = @"c:\current"
let backupDir = @"c:\archives\2008"
let picList = Directory.GetFiles(sourceDir, "*.jpg")
let txtList = Directory.GetFiles(sourceDir, "*.txt")
// Copy picture files.
for f in picList do
// Remove path from the file name.
let fName = f.Substring(sourceDir.Length + 1)
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true)
// Copy text files.
for f in txtList do
// Remove path from the file name.
let fName = f.Substring(sourceDir.Length + 1)
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))
// Catch exception if the file was already copied.
| :? IOException as copyError -> printfn $"{copyError.Message}"
// Delete source files that were copied.
for f in txtList do
File.Delete f
for f in picList do
File.Delete f
// Catch exception if the file was already copied.
| :? DirectoryNotFoundException as dirNotFound -> printfn $"{dirNotFound.Message}"
Dim sourceDir As String = "c:\current"
Dim backupDir As String = "c:\archives\2008"
Dim picList As String() = Directory.GetFiles(sourceDir, "*.jpg")
Dim txtList As String() = Directory.GetFiles(sourceDir, "*.txt")
' Copy picture files.
For Each f As String In picList
'Remove path from the file name.
Dim fName As String = f.Substring(sourceDir.Length + 1)
' Use the Path.Combine method to safely append the file name to the path.
' Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), True)
' Copy text files.
For Each f As String In txtList
'Remove path from the file name.
Dim fName As String = f.Substring(sourceDir.Length + 1)
' Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))
' Catch exception if the file was already copied.
Catch copyError As IOException
Console.WriteLine(copyError.Message)
End Try
For Each f As String In txtList
File.Delete(f)
For Each f As String In picList
File.Delete(f)
Catch dirNotFound As DirectoryNotFoundException
Console.WriteLine(dirNotFound.Message)
End Try
sourceFileName和 destFileName 參數可以指定相對或絕對路徑資訊。 相對路徑資訊會解譯為相對於目前的工作目錄。 這個方法不支持參數中的通配符。
源檔的屬性會保留在複製的檔案中。
如需一般 I/O 工作的清單，請參閱 一般 I/O 工作。
public:
static void Copy(System::String ^ sourceFileName, System::String ^ destFileName);
public static void Copy (string sourceFileName, string destFileName);
static member Copy : string * string -> unit
Public Shared Sub Copy (sourceFileName As String, destFileName As String)
ArgumentException
sourceFileName 或 destFileName 為零長度字串，只包含空格或包含一或多個無效字元。 您可以使用 GetInvalidPathChars() 方法查詢無效字元。
sourceFileName 或 destFileName 會指定目錄。
下列範例會將檔案複製到 C：\archives\2008 備份資料夾。 它會使用 方法的兩個 Copy 多載，如下所示：
它會先使用 File.Copy(String, String) 方法多載來複製 (.txt) 檔案的文字。 此程式代碼示範此多載不允許覆寫已複製的檔案。
然後， File.Copy(String, String, Boolean) 它會使用 方法多載來複製圖片 (.jpg 檔案) 。 此程式代碼示範此多載確實允許覆寫已複製的檔案。
string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";
string[] picList = Directory.GetFiles(sourceDir, "*.jpg");
string[] txtList = Directory.GetFiles(sourceDir, "*.txt");
// Copy picture files.
foreach (string f in picList)
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true);
// Copy text files.
foreach (string f in txtList)
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
// Catch exception if the file was already copied.
catch (IOException copyError)
Console.WriteLine(copyError.Message);
// Delete source files that were copied.
foreach (string f in txtList)
File.Delete(f);
foreach (string f in picList)
File.Delete(f);
catch (DirectoryNotFoundException dirNotFound)
Console.WriteLine(dirNotFound.Message);
let sourceDir = @"c:\current"
let backupDir = @"c:\archives\2008"
let picList = Directory.GetFiles(sourceDir, "*.jpg")
let txtList = Directory.GetFiles(sourceDir, "*.txt")
// Copy picture files.
for f in picList do
// Remove path from the file name.
let fName = f.Substring(sourceDir.Length + 1)
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true)
// Copy text files.
for f in txtList do
// Remove path from the file name.
let fName = f.Substring(sourceDir.Length + 1)
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))
// Catch exception if the file was already copied.
| :? IOException as copyError -> printfn $"{copyError.Message}"
// Delete source files that were copied.
for f in txtList do
File.Delete f
for f in picList do
File.Delete f
// Catch exception if the file was already copied.
| :? DirectoryNotFoundException as dirNotFound -> printfn $"{dirNotFound.Message}"
Dim sourceDir As String = "c:\current"
Dim backupDir As String = "c:\archives\2008"
Dim picList As String() = Directory.GetFiles(sourceDir, "*.jpg")
Dim txtList As String() = Directory.GetFiles(sourceDir, "*.txt")
' Copy picture files.
For Each f As String In picList
'Remove path from the file name.
Dim fName As String = f.Substring(sourceDir.Length + 1)
' Use the Path.Combine method to safely append the file name to the path.
' Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), True)
' Copy text files.
For Each f As String In txtList
'Remove path from the file name.
Dim fName As String = f.Substring(sourceDir.Length + 1)
' Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))
' Catch exception if the file was already copied.
Catch copyError As IOException
Console.WriteLine(copyError.Message)
End Try
For Each f As String In txtList
File.Delete(f)
For Each f As String In picList
File.Delete(f)
Catch dirNotFound As DirectoryNotFoundException
Console.WriteLine(dirNotFound.Message)
End Try
這個方法相當於方法多載，Copy(String, String, Boolean)overwrite並將 參數設定為 false。
sourceFileName和 destFileName 參數可以指定相對或絕對路徑資訊。 相對路徑資訊會解譯為相對於目前的工作目錄。 若要取得目前的工作目錄，請參閱 Directory.GetCurrentDirectory 方法。 這個方法不支持參數中的通配符。
源檔的屬性會保留在複製的檔案中。
即將登場：在 2024 年，我們將逐步淘汰 GitHub 問題作為內容的意見反應機制，並將它取代為新的意見反應系統。 如需詳細資訊，請參閱：https://aka.ms/ContentUserFeedback。
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