创建文件或文件夹
您可通过编程方式在您的计算机上创建文件夹、子文件夹和子文件夹中的文件，并将数据写入文件。
public class CreateFileOrFolder
{
static void Main()
{
string folderName = @"c:\Top-Level Folder" ;
string pathString = System.IO.Path.Combine(folderName, "SubFolder" );
string pathString2 = @"c:\Top-Level Folder\SubFolder2" ;
System.IO.Directory.CreateDirectory(pathString);
string fileName = System.IO.Path.GetRandomFileName();
pathString = System.IO.Path.Combine(pathString, fileName);
Console.WriteLine( "Path to my file: {0}\n" , pathString);
if (!System.IO.File.Exists(pathString))
{
using (System.IO.FileStream fs = System.IO.File.Create(pathString))
{
for ( byte i = 0; i < 100; i++)
{
fs.WriteByte(i);
}
}
}
else
{
Console.WriteLine( "File \"{0}\" already exists." , fileName);
return ;
}
try
{
byte [] readBuffer = System.IO.File.ReadAllBytes(pathString);
foreach ( byte b in readBuffer)
{
Console.Write(b + " " );
}
Console.WriteLine();
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
}
System.Console.WriteLine( "Press any key to exit." );
System.Console.ReadKey();
}
}
输出：
Path to my file: c:\Top-Level Folder\SubFolder\ttxvauxe.vv0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 8
3 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
如果该文件夹已存在，则 CreateDirectory 不执行任何操作，且不会引发异常。但是，File.Create 用新的文件替换现有文件。该示例使用一个 if-else 语句阻止现有文件被替换。
通过在示例中做出以下更改，您可以根据具有某个名称的程序是否存在来指定不同的结果。如果该文件不存在，代码将创建一个文件。如果该文件存在，代码将把数据添加到该文件中。
指定一个非随机文件名。
// Comment out the following line.
//string fileName = System.IO.Path.GetRandomFileName();
// Replace that line with the following assignment.
string fileName = "MyNewFile.txt" ;
用以下代码中的 using 语句替换 if-else 语句。
using (System.IO.FileStream fs = new System.IO.FileStream(pathString, FileMode.Append))
{
for ( byte i = 0; i < 100; i++)
{
fs.WriteByte(i);
}
}
运行该示例若干次以验证数据是否每次都添加到文件中。
复制、删除和移动文件和文件夹
以下示例说明如何使用 System.IO 命名空间中的 System.IO.File、System.IO.Directory、System.IO.FileInfo 和 System.IO.DirectoryInfo 类以同步方式复制、移动和删除文件和文件夹。 这些示例没有提供进度栏或其他任何用户界面。
。
示例
下面的示例演示如何复制文件和目录。
public class SimpleFileCopy
{
static void Main()
{
string fileName = "test.txt" ;
string sourcePath = @"C:\Users\Public\TestFolder" ;
string targetPath = @"C:\Users\Public\TestFolder\SubDir" ;
// Use Path class to manipulate file and directory paths.
string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
string destFile = System.IO.Path.Combine(targetPath, fileName);
// To copy a folder's contents to a new location:
// Create a new target folder, if necessary.
if (!System.IO.Directory.Exists(targetPath))
{
System.IO.Directory.CreateDirectory(targetPath);
}
// To copy a file to another location and
// overwrite the destination file if it already exists.
System.IO.File.Copy(sourceFile, destFile, true );
// To copy all the files in one directory to another directory.
// Get the files in the source folder. (To recursively iterate through
// all subfolders under the current directory, see
// "How to: Iterate Through a Directory Tree.")
// Note: Check for target path was performed previously
// in this code example.
if (System.IO.Directory.Exists(sourcePath))
{
string [] files = System.IO.Directory.GetFiles(sourcePath);
// Copy the files and overwrite destination files if they already exist.
foreach ( string s in files)
{
// Use static Path methods to extract only the file name from the path.
fileName = System.IO.Path.GetFileName(s);
destFile = System.IO.Path.Combine(targetPath, fileName);
System.IO.File.Copy(s, destFile, true );
}
}
else
{
Console.WriteLine( "Source path does not exist!" );
}
// Keep console window open in debug mode.
Console.WriteLine( "Press any key to exit." );
Console.ReadKey();
}
}
下面的示例演示如何移动文件和目录。
public class SimpleFileMove
{
static void Main()
{
string sourceFile = @"C:\Users\Public\public\test.txt" ;
string destinationFile = @"C:\Users\Public\private\test.txt" ;
// To move a file or folder to a new location:
System.IO.File.Move(sourceFile, destinationFile);
// To move an entire directory. To programmatically modify or combine
// path strings, use the System.IO.Path class.
System.IO.Directory.Move( @"C:\Users\Public\public\test\" , @"C:\Users\Public\private" );
}
}
下面的示例演示如何删除文件和目录。
public class SimpleFileDelete
{
static void Main()
{
// Delete a file by using File class static method...
if (System.IO.File.Exists( @"C:\Users\Public\DeleteTest\test.txt" ))
{
// Use a try block to catch IOExceptions, to
// handle the case of the file already being
// opened by another process.
try
{
System.IO.File.Delete( @"C:\Users\Public\DeleteTest\test.txt" );
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
return ;
}
}
// ...or by using FileInfo instance method.
System.IO.FileInfo fi = new System.IO.FileInfo( @"C:\Users\Public\DeleteTest\test2.txt" );
try
{
fi.Delete();
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
}
// Delete a directory. Must be writable or empty.
try
{
System.IO.Directory.Delete( @"C:\Users\Public\DeleteTest" );
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
}
// Delete a directory and all subdirectories with Directory static method...
if (System.IO.Directory.Exists( @"C:\Users\Public\DeleteTest" ))
{
try
{
System.IO.Directory.Delete( @"C:\Users\Public\DeleteTest" , true );
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
}
}
// ...or with DirectoryInfo instance method.
System.IO.DirectoryInfo di = new System.IO.DirectoryInfo( @"C:\Users\Public\public" );
// Delete this dir and all subdirs.
try
{
di.Delete( true );
}
catch (System.IO.IOException e)
{
Console.WriteLine(e.Message);
}
}
}
dy("nrwz");
查看更多关于C#程序中创建、复制、移动、删除文件或文件夹的示例的详细内容...