IsolatedStorageFile Class in .NET

This article has been excerpted from book "The Complete Visual C# Programmer's Guide" from the Authors of C# Corner.

The .NET Framework provides the IsolatedStorageFile class to represent a store for an assembly. 

Listing 22.34 shows various aspects of IsolatedStorage namespace classes and methods. 

Listing 22.34: IsolatedStorage Example 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO.IsolatedStorage;

using System.IO;

namespace IsolatedStorageFile_Class

{

    class Program

    {

        static void Main(string[] args)

        {

            // isolated storage

            // in System.IO.IsolatedStorage namespace

            // Obtain a store

            IsolatedStorageFile store1 =

            IsolatedStorageFile.GetUserStoreForDomain();

            // you can also use static GetStore methods like below

            /*

            IsolatedStorageFile storefile1 = IsolatedStorageFile.GetStore(

            IsolatedStorageScope.User |

            IsolatedStorageScope.Assembly,

            null,

            null);

            IsolatedStorageFile storefile1 = IsolatedStorageFile.GetStore(

            IsolatedStorageScope.User |

            IsolatedStorageScope.Assembly |

            IsolatedStorageScope.Domain,

            null,

            null);

            IsolatedStorageFile storefile1 = IsolatedStorageFile.GetStore(

            IsolatedStorageScope.User |

            IsolatedStorageScope.Assembly |

            IsolatedStorageScope.Roaming,

            null,

            null);

            IsolatedStorageFile storefile1 = IsolatedStorageFile.GetStore(

            IsolatedStorageScope.User |

             * IsolatedStorageScope.Assembly |

            IsolatedStorageScope.Domain |

            IsolatedStorageScope.Roaming,

            null,

            null);

            */

            IsolatedStorageFileStream stream1 =

            new IsolatedStorageFileStream("file1.txt",

            FileMode.Create, store1);

            StreamWriter writer = new StreamWriter(stream1);

            writer.WriteLine("Hello Isolated Storage");

            writer.Close();

            stream1.Close();

            store1.Close();

            // Read from a file in isolated storage

            IsolatedStorageFileStream stream2 =

            new IsolatedStorageFileStream("file2.txt",

            FileMode.Open, store1);

            StreamReader reader = new StreamReader(stream1);

            String sb = reader.ReadToEnd();

            reader.Close();

            stream1.Close();

            store1.Close();

            // Obtain a store

            // Create a directory

            store1.CreateDirectory("dir1");

            // Create two directories, one inside the other

            store1.CreateDirectory("dir2/dir3");

            // Create a directory

            store1.CreateDirectory("dir4");

            // Delete the directory

            store1.DeleteDirectory("dir4");

            // Obtain a store

            IsolatedStorageFile store2 =

            IsolatedStorageFile.GetUserStoreForDomain();

            // Create an empty file

            IsolatedStorageFileStream stream3 =

            new IsolatedStorageFileStream("file3.txt",

            FileMode.Create, store1);

            stream1.Close();

            // Delete the file

            store1.DeleteFile("file3.txt");

            // Find a storage space available

            // Obtain a store

            IsolatedStorageFile store3 =

            IsolatedStorageFile.GetUserStoreForDomain();

            // Compute the storage available in the store

            ulong spaceLeft =

            store1.MaximumSize - store1.CurrentSize;

            // Enumerate files and directories

            // Obtain a store

            IsolatedStorageFile store4 =

            IsolatedStorageFile.GetUserStoreForDomain();

            // Get all of the directories in the root of the store

            string[] directories = store1.GetDirectoryNames("*");

            // Get all of the files in the root of the store

            string[] files = store1.GetFileNames("*");

        }

    }

}

Conclusion

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The Complete Visual C# Programmer's Guide covers most of the major components that make up C# and the .net environment. The book is geared toward the intermediate programmer, but contains enough material to satisfy the advanced developer.