学步园

将现有文件复制到新文件，不允许改写现有文件。[C#] public FileInfo CopyTo(string);

将现有文件复制到新文件，允许改写现有文件。[C#] public FileInfo CopyTo(string, bool);
[C#]

  将文件复制到指定路径，允许改写同名的目标文件 COPY
using System;
using System.IO;

class Test
{
    public static void Main()
    {
        string path = @"c:/temp/MyTest.txt";
        string path2 = path + "temp";

        try
        {
            // Create the file and clean up handles.
            using (FileStream fs = File.Create(path)) {}

            // Ensure that the target does not exist.
            File.Delete(path2);

            // Copy the file.
            File.Copy(path, path2);
            Console.WriteLine("{0} copied to {1}", path, path2);

            // Try to copy the same file again, which should succeed.
            File.Copy(path, path2, true);
            Console.WriteLine("The second Copy operation succeeded, which was expected.");
        }

        catch
        {
            Console.WriteLine("Double copy is not allowed, which was not expected.");
        }
    }
}
[C#]  COPY TO
using System;
using System.IO;

class Test
{
        public static void Main()
    {
        string path = @"c:/temp/MyTest.txt";
        string path2 = @"c:/temp/MyTest.txt" + "temp";
        FileInfo fi1 = new FileInfo(path);
        FileInfo fi2 = new FileInfo(path2);

        try
        {
            // Create the file and clean up handles.
            using (FileStream fs = fi1.Create()) {}

            //Ensure that the target does not exist.
            fi2.Delete();

            //Copy the file.
            fi1.CopyTo(path2);
            Console.WriteLine("{0} was copied to {1}.", path, path2);

            //Try to copy it again, which should succeed.
            fi1.CopyTo(path2, true);

            Console.WriteLine("The second Copy operation succeeded, which is expected.");

        }
        catch
        {
            Console.WriteLine("Double copying was not allowed, which is not expected.");
        }
    }
}

Progress 类的使用
private void CopyWithProgress(string[] filenames)
{
    // Display the ProgressBar control.
    pBar1.Visible = true;
    // Set Minimum to 1 to represent the first file being copied.
    pBar1.Minimum = 1;
    // Set Maximum to the total number of files to copy.
    pBar1.Maximum = filenames.Length;
    // Set the initial value of the ProgressBar.
    pBar1.Value = 1;
    // Set the Step property to a value of 1 to represent each file

being copied.
    pBar1.Step = 1;
                // Loop through all files to copy.
    for (int x = 1; x <= filenames.Length; x++)
    {
        // Copy the file and increment the ProgressBar if successful.
        if(CopyFile(filenames[x-1]) == true)
        {
            // Perform the increment on the ProgressBar.
            pBar1.PerformStep();
        }
    }
}