System.IO.File.Move(oldNameFullPath, newNameFullPath);

// Source file to be renamed  
string sourceFile = @"C:\Temp\MaheshChand.jpg";  
// Create a FileInfo  
System.IO.FileInfo fi = new System.IO.FileInfo(sourceFile);  
// Check if file is there  
if (fi.Exists)  
{  
// Move file with a new name. Hence renamed.  
fi.MoveTo(@"C:\Temp\Mahesh.jpg");  
Console.WriteLine("File Renamed.");  
}  

private static void Rename_File(string FileFullPath, string NewName) // nes name without directory actualy you can simply rename with fileinfo.MoveTo(Fullpathwithnameandextension);
        {
            FileInfo fileInfo = new FileInfo(FileFullPath);
            string DirectoryRoot = Directory.GetParent(FileFullPath).FullName;

            string filecreator = FileFullPath.Substring(DirectoryRoot.Length,FileFullPath.Length-DirectoryRoot.Length);
             
            filecreator = DirectoryRoot + NewName;
            try
            {
                fileInfo.MoveTo(filecreator);
            }
            catch(Exception ex)
            {
                Console.WriteLine(filecreator);
                Console.WriteLine(ex.Message);
                Console.ReadKey();
            }

    enter code here
            // string FileDirectory = Directory.GetDirectoryRoot()

        }

当c#没有某些特性时，我就用c++或C:

public partial class Program
{
    [DllImport("msvcrt", CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
    public static extern int rename(
            [MarshalAs(UnmanagedType.LPStr)]
            string oldpath,
            [MarshalAs(UnmanagedType.LPStr)]
            string newpath);

    static void FileRename()
    {
        while (true)
        {
            Console.Clear();
            Console.Write("Enter a folder name: ");
            string dir = Console.ReadLine().Trim('\\') + "\\";
            if (string.IsNullOrWhiteSpace(dir))
                break;
            if (!Directory.Exists(dir))
            {
                Console.WriteLine("{0} does not exist", dir);
                continue;
            }
            string[] files = Directory.GetFiles(dir, "*.mp3");

            for (int i = 0; i < files.Length; i++)
            {
                string oldName = Path.GetFileName(files[i]);
                int pos = oldName.IndexOfAny(new char[] { '0', '1', '2' });
                if (pos == 0)
                    continue;

                string newName = oldName.Substring(pos);
                int res = rename(files[i], dir + newName);
            }
        }
        Console.WriteLine("\n\t\tPress any key to go to main menu\n");
        Console.ReadKey(true);
    }
}

注意:在这个示例代码中，我们打开一个目录并搜索PDF文件，文件名中包含开括号和闭括号。您可以检查和替换名称中的任何字符，或者使用替换函数指定一个全新的名称。

从这段代码中还可以使用其他方法来进行更详细的重命名，但我的主要目的是展示如何使用File。移动做批量重命名。当我在我的笔记本电脑上运行它时，它可以处理180个目录中的335个PDF文件。这是一时兴起的代码，还有更详细的方法来实现它。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BatchRenamer
{
    class Program
    {
        static void Main(string[] args)
        {
            var dirnames = Directory.GetDirectories(@"C:\the full directory path of files to rename goes here");

            int i = 0;

            try
            {
                foreach (var dir in dirnames)
                {
                    var fnames = Directory.GetFiles(dir, "*.pdf").Select(Path.GetFileName);

                    DirectoryInfo d = new DirectoryInfo(dir);
                    FileInfo[] finfo = d.GetFiles("*.pdf");

                    foreach (var f in fnames)
                    {
                        i++;
                        Console.WriteLine("The number of the file being renamed is: {0}", i);

                        if (!File.Exists(Path.Combine(dir, f.ToString().Replace("(", "").Replace(")", ""))))
                        {
                            File.Move(Path.Combine(dir, f), Path.Combine(dir, f.ToString().Replace("(", "").Replace(")", "")));
                        }
                        else
                        {
                            Console.WriteLine("The file you are attempting to rename already exists! The file path is {0}.", dir);
                            foreach (FileInfo fi in finfo)
                            {
                                Console.WriteLine("The file modify date is: {0} ", File.GetLastWriteTime(dir));
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.Read();
        }
    }
}

在我的例子中，我希望重命名文件的名称是唯一的，所以我在名称中添加了一个日期-时间戳。这样，'old'日志的文件名总是唯一的:

if (File.Exists(clogfile))
{
    Int64 fileSizeInBytes = new FileInfo(clogfile).Length;
    if (fileSizeInBytes > 5000000)
    {
        string path = Path.GetFullPath(clogfile);
        string filename = Path.GetFileNameWithoutExtension(clogfile);
        System.IO.File.Move(clogfile, Path.Combine(path, string.Format("{0}{1}.log", filename, DateTime.Now.ToString("yyyyMMdd_HHmmss"))));
    }
}