File.Copy File.Copy File.Copy File.Copy Method

Definition

Copies an existing file to a new file.

Overloads

Copy(String, String) Copy(String, String) Copy(String, String) Copy(String, String)

Copies an existing file to a new file. Overwriting a file of the same name is not allowed.

Copy(String, String, Boolean) Copy(String, String, Boolean) Copy(String, String, Boolean) Copy(String, String, Boolean)

Copies an existing file to a new file. Overwriting a file of the same name is allowed.

Copy(String, String) Copy(String, String) Copy(String, String) Copy(String, String)

Copies an existing file to a new file. Overwriting a file of the same name is not allowed.

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)

Parameters

sourceFileName
String String String String

The file to copy.

destFileName
String String String String

The name of the destination file. This cannot be a directory or an existing file.

Exceptions

sourceFileName or destFileName is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.

-or-

sourceFileName or destFileName specifies a directory.

The specified path, file name, or both exceed the system-defined maximum length.

The path specified in sourceFileName or destFileName is invalid (for example, it is on an unmapped drive).

destFileName exists.

-or-

An I/O error has occurred.

sourceFileName or destFileName is in an invalid format.

Examples

The following example copies files to the C:\archives\2008 backup folder. It uses the two overloads of the Copy method as follows:

  • It first uses the File.Copy(String, String) method overload to copy text (.txt) files. The code demonstrates that this overload does not allow overwriting files that were already copied.

  • It then uses the File.Copy(String, String, Boolean) method overload to copy pictures (.jpg files). The code demonstrates that this overload does allow overwriting files that were already copied.

string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";

try
{
    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);

        try
        {
            // 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);
}

Dim sourceDir As String = "c:\current"
Dim backupDir As String = "c:\archives\2008"

Try
    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)
    Next

    ' 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)

        Try
            ' 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
    Next

    For Each f As String In txtList
        File.Delete(f)
    Next

    For Each f As String In picList
        File.Delete(f)
    Next

Catch dirNotFound As DirectoryNotFoundException
    Console.WriteLine(dirNotFound.Message)
End Try

Remarks

This method is equivalent to the Copy(String, String, Boolean) method overload with the overwrite parameter set to false.

The sourceFileName and destFileName parameters can specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see the Directory.GetCurrentDirectory method. This method does not support wildcard characters in the parameters.

The attributes of the original file are retained in the copied file.

Security

FileIOPermission
for reading from sourceFileName and writing to destFileName. Associated enumerations: Read, Write

See Also

Copy(String, String, Boolean) Copy(String, String, Boolean) Copy(String, String, Boolean) Copy(String, String, Boolean)

Copies an existing file to a new file. Overwriting a file of the same name is allowed.

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)

Parameters

sourceFileName
String String String String

The file to copy.

destFileName
String String String String

The name of the destination file. This cannot be a directory.

overwrite
Boolean Boolean Boolean Boolean

true if the destination file can be overwritten; otherwise, false.

Exceptions

The caller does not have the required permission.

-or-

destFileName is read-only.

sourceFileName or destFileName is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.

-or-

sourceFileName or destFileName specifies a directory.

The specified path, file name, or both exceed the system-defined maximum length.

The path specified in sourceFileName or destFileName is invalid (for example, it is on an unmapped drive).

destFileName exists and overwrite is false.

-or-

An I/O error has occurred.

sourceFileName or destFileName is in an invalid format.

Examples

The following example copies files to the C:\archives\2008 backup folder. It uses the two overloads of the Copy method as follows:

  • It first uses the File.Copy(String, String) method overload to copy text (.txt) files. The code demonstrates that this overload does not allow overwriting files that were already copied.

It then uses the File.Copy(String, String, Boolean) method overload to copy pictures (.jpg files). The code demonstrates that this overload does allow overwriting files that were already copied.

string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";

try
{
    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);

        try
        {
            // 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);
}

Dim sourceDir As String = "c:\current"
Dim backupDir As String = "c:\archives\2008"

Try
    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)
    Next

    ' 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)

        Try
            ' 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
    Next

    For Each f As String In txtList
        File.Delete(f)
    Next

    For Each f As String In picList
        File.Delete(f)
    Next

Catch dirNotFound As DirectoryNotFoundException
    Console.WriteLine(dirNotFound.Message)
End Try

Remarks

The sourceFileName and destFileName parameters can specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. This method does not support wildcard characters in the parameters.

The attributes of the original file are retained in the copied file.

For a list of common I/O tasks, see Common I/O Tasks.

Security

FileIOPermission
for reading from sourceFileName and writing to destFileName. Associated enumerations: Read, Write

See Also

Applies to