File.Copy 方法 (System.IO) | Microsoft Learn

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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。
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