如何复制文件

Question

c盘有个“bb.dat”文件，d盘也有个“bb.dat”文件，要将c盘的文件覆盖d盘的文件，
并保留c盘的文件，该怎么搞？

Answer 1

 File.Delete("D:\\bb.dat");
            File.Copy("C:\\bb.dat", "D:\\bb.dat");
           

Answer 2

            FileInfo file = new FileInfo(@"c:\bb.dat");
            file.CopyTo(@"d:\bb.dat", true);

Answer 3

或者File.Copy(@"c:\bb.dat", @"d:\bb.dat", true);

Answer 4

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.");
        }
    }
}