运用 .NET的IO(5) Paul_Ni（原作）

查找现有的文件和目录

FindingExistingFilesAndDirectories 示例

 [C#]

using System;

using System.IO;

using System.IO.IsolatedStorage;

using System.Collections;

public class FindingExistingFilesAndDirectories{

 // Retrieves an array of all directories in the store, and 

 // displays the results.

 public static void Main(){

// This part of the code sets up a few directories and files in the

// store.

IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null);

isoStore.CreateDirectory("TopLevelDirectory");

isoStore.CreateDirectory("TopLevelDirectory/SecondLevel");

isoStore.CreateDirectory("AnotherTopLevelDirectory/InsideDirectory");

new IsolatedStorageFileStream("InTheRoot.txt", FileMode.Create, isoStore);

new IsolatedStorageFileStream("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt", FileMode.Create, isoStore);

// End of setup.

Console.WriteLine('\r');

Console.WriteLine("Here is a list of all directories in this isolated store:");

foreach(string directory in GetAllDirectories("*", isoStore)){

 Console.WriteLine(directory);

}

Console.WriteLine('\r');

// Retrieve all the files in the directory by calling the GetFiles 

// method.

Console.WriteLine("Here is a list of all the files in this isolated store:");

foreach(string file in GetAllFiles("*", isoStore)){

 Console.WriteLine(file);

}

 }// End of Main.

 // Method to retrieve all directories, recursively, within a store.

 public static string[] GetAllDirectories(string pattern, IsolatedStorageFile storeFile){

// Get the root of the search string.

string root = Path.GetDirectoryName(pattern);

if (root != "") root += "/";

// Retrieve directories.

string[] directories;

directories = storeFile.GetDirectoryNames(pattern);

ArrayList directoryList = new ArrayList(directories);

// Retrieve subdirectories of matches.

for (int i = 0, max = directories.Length; i < max; i++){

 string directory = directoryList[i] + "/";

 string[] more = GetAllDirectories (root + directory + "*", storeFile);

 // For each subdirectory found, add in the base path.

 for (int j = 0; j < more.Length; j++)

more[j] = directory + more[j];

 // Insert the subdirectories into the list and 

 // update the counter and upper bound.

 directoryList.InsertRange(i+1, more);

 i += more.Length;

 max += more.Length;

}

return (string[])directoryList.ToArray(Type.GetType("System.String"));

 }

 public static string[] GetAllFiles(string pattern, IsolatedStorageFile storeFile){

// Get the root and file portions of the search string.

string fileString = Path.GetFileName(pattern);

string[] files;

files = storeFile.GetFileNames(pattern);

ArrayList fileList = new ArrayList(files);

// Loop through the subdirectories, collect matches, 

// and make separators consistent.

foreach(string directory in GetAllDirectories( "*", storeFile))

 foreach(string file in storeFile.GetFileNames(directory + "/" + fileString))

fileList.Add((directory + "/" + file));

return (string[])fileList.ToArray(Type.GetType("System.String"));

 }// End of GetFiles.

}

读取和写入文件

ReadingAndWritingToFiles 示例

 [C#]

using System;

using System.IO;

using System.IO.IsolatedStorage;

public class ReadingAndWritingToFiles{

 public static int Main(){

// Get an isolated store for this assembly and put it into an

// IsolatedStoreFile object.

IsolatedStorageFile isoStore =IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null);

// This code checks to see if the file already exists.

string[] fileNames = isoStore.GetFileNames("TestStore.txt");

foreach (string file in fileNames){

 if(file == "TestStore.txt"){

Console.WriteLine("The file already exists!");

Console.WriteLine("Type \"StoreAdm /REMOVE\" at the command line to delete all Isolated Storage for this user.");

// Exit the program.

return 0;

 }

}

writeToFile(isoStore);

Console.WriteLine("The file \"TestStore.txt\" contains:");

// Call the readFromFile and write the returned string to the

//console.

Console.WriteLine(readFromFile(isoStore));

// Exit the program.

return 0;

 }// End of main.

 // This method writes "Hello Isolated Storage" to the file.

 private static void writeToFile(IsolatedStorageFile isoStore){

// Declare a new StreamWriter.

StreamWriter writer = null;

// Assign the writer to the store and the file TestStore.

writer = new StreamWriter(new IsolatedStorageFileStream("TestStore.txt", FileMode.CreateNew,isoStore));

// Have the writer write "Hello Isolated Storage" to the store.

writer.WriteLine("Hello Isolated Storage");

writer.Close();

Console.WriteLine("You have written to the file.");

 }// End of writeToFile.

 // This method reads the first line in the "TestStore.txt" file.

 public static String readFromFile(IsolatedStorageFile isoStore){

// This code opens the TestStore.txt file and reads the string.

StreamReader reader = new StreamReader(new IsolatedStorageFileStream("TestStore.txt", FileMode.Open,isoStore));

// Read a line from the file and add it to sb.

String sb = reader.ReadLine();

// Close the reader.

reader.Close();

// Return the string.

return sb.ToString();

 }// End of readFromFile.

}

删除文件和目录

DeletingFilesAndDirectories 示例

 [C#]

using System;

using System.IO.IsolatedStorage;

using System.IO;

public class DeletingFilesDirectories{

 public static void Main(){

// Get a new isolated store for this user domain and assembly.

// Put the store into an isolatedStorageFile object.

IsolatedStorageFile isoStore =IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Domain | IsolatedStorageScope.Assembly, null, null);

Console.WriteLine("Creating Directories:");

// This code creates several different directories.

isoStore.CreateDirectory("TopLevelDirectory");

Console.WriteLine("TopLevelDirectory");

isoStore.CreateDirectory("TopLevelDirectory/SecondLevel");

Console.WriteLine("TopLevelDirectory/SecondLevel");

// This code creates two new directories, one inside the other.

isoStore.CreateDirectory("AnotherTopLevelDirectory/InsideDirectory");

Console.WriteLine("AnotherTopLevelDirectory/InsideDirectory");

Console.WriteLine();

// This code creates a few files and places them in the directories.

Console.WriteLine("Creating Files:");

// This file is placed in the root.

IsolatedStorageFileStream isoStream1 = new IsolatedStorageFileStream("InTheRoot.txt", FileMode.Create, isoStore);

Console.WriteLine("InTheRoot.txt");

isoStream1.Close();

// This file is placed in the InsideDirectory.

IsolatedStorageFileStream isoStream2 = new IsolatedStorageFileStream("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt", FileMode.Create, isoStore);

Console.WriteLine("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt");

Console.WriteLine();

isoStream2.Close();

Console.WriteLine("Deleting File:");

// This code deletes the HereIAm.txt file.

isoStore.DeleteFile("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt");

Console.WriteLine("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt"); 

Console.WriteLine();

Console.WriteLine("Deleting Directory:");

// This code deletes the InsideDirectory.

isoStore.DeleteDirectory("AnotherTopLevelDirectory/InsideDirectory/");

Console.WriteLine("AnotherTopLevelDirectory/InsideDirectory/");

Console.WriteLine();

 }// End of main.

}

总结