c# generate barcode from string IsolatedStorageFile Static/Shared Methods in C#

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Table 2-34 IsolatedStorageFile Static/Shared Methods
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Name GetMachineStoreForApplication GetMachineStoreForAssembly GetMachineStoreForDomain GetStore GetUserStoreForApplication GetUserStoreForAssembly GetUserStoreForDomain
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Description Retrieves a machine-level store for calling the Click-Once application Retrieves a machine-level store for the assembly that called Retrieves a machine-level store for the AppDomain within the current assembly that called Retrieves stores based on the IsolatedStorageScope enumerator Retrieves a user-level store for the Click-Once application that called Retrieves a user-level store for the assembly that called Retrieves a user-level store for the AppDomain within the current assembly that called
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Table 2-35 shows the most important IsolatedStorageFile properties.
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Table 2-35 IsolatedStorageFile Properties
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Name ApplicationIdentity AssemblyIdentity
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Description The Click-Once application s identity that scopes the isolated storage The assembly s identity that scopes the isolated storage
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Lesson 4: Working with Isolated Storage
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Table 2-35 IsolatedStorageFile Properties
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Name CurrentSize DomainIdentity MaximumSize Scope
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Description The current size of the data stored in this isolated storage The identity of the AppDomain that scopes the isolated storage The maximum storage size for this isolated storage The IsolatedStorageScope enumeration value that describes the scope of this isolated storage
Table 2-36 shows the most important IsolatedStorageFile methods.
Table 2-36 IsolatedStorageFile Methods
Name Close CreateDirectory DeleteDirectory DeleteFile GetDirectoryNames GetFileNames Remove
Description Closes an instance of a store Creates a directory within the store Deletes a directory within the store Deletes a file within the store Gets a list of directory names within the store that match a file mask Gets a list of file names within the store that match a file mask Removes the entire store from the current system
How to Create a Store
Before you can save data in isolated storage, you must determine how to scope the data you want in your store. For most applications, you will want to choose one of the following two methods:
Assembly/Machine This method creates a store to keep information that is spe-
cific to the calling assembly and the local machine. This method is useful for creating application-level data.
Assembly/User This method creates a store to keep information that is specific to the calling assembly and the current user. This method is useful for creating user-level data.
2
Input/Output (I/O)
Creating an assembly/machine-level store is accomplished by calling the IsolatedStorageFile class s GetMachineStoreForAssembly method, as shown here:
' VB Dim machineStorage as IsolatedStorageFile = _ IsolatedStorageFile.GetMachineStoreForAssembly() // C# IsolatedStorageFile machineStorage = IsolatedStorageFile.GetMachineStoreForAssembly();
This isolated storage store is specific to the assembly that is calling it, whether that is the main executable in a Microsoft Windows Forms project or a dynamic-link library (DLL) that is part of a larger project. Creating an assembly/user-level store is similar, but the method is named GetUserStoreForAssembly, as shown in this example:
' VB Dim userStorage as IsolatedStorageFile = _ IsolatedStorageFile.GetUserStoreForAssembly() // C# IsolatedStorageFile userStorage = IsolatedStorageFile.GetUserStoreForAssembly();
The store in this case is scoped to the specific user that is executing the assembly. If you need to specify the user for the store, you will need to use impersonation (which is covered in 12).
NOTE Application-level store
For Click-Once deployed applications, isolated storage also supports an application-level store that supports both a machine-level store and a user-level store. Application level stores work only within Click-Once applications because the executing assembly has its own evidence that might or might not be valid for local applications.
MORE INFO
Isolated storage
For more information about isolated storage, see the following sources:
Introduction to Isolated Storage by Microsoft Corporation (available online at http://msdn.microsoft .com/library/default.asp url=/library/en-us/cpguide/html/cpconintroductiontoisolatedstorage.asp). Windows Forms Programming in C#/VB.NET by Chris Sells (Addison-Wesley, 2004). Read 11, pages 426 430, Application Settings, for an explanation of how different types of stores affect users and roaming users.
Lesson 4: Working with Isolated Storage
The IsolatedStorageFileStream Class
The IsolatedStorageFileStream class encapsulates a stream that is used to create files in isolated storage. This class derives from the FileStream class, so its usage after creation is almost identical to the FileStream class. Table 2-37 shows the most important IsolatedStorageFileStream properties.
Table 2-37 IsolatedStorageFileStream Properties
Name CanRead CanSeek CanTimeout CanWrite Handle Length Name Position
Description Determines whether the stream supports reading. (Inherited from the Stream class.) Determines whether the stream supports seeking. (Inherited from the Stream class.) Determines whether the stream can time out. (Inherited from the Stream class.) Determines whether the stream can be written to. (Inherited from the Stream class.) Gets the stream s underlying file handle. (Inherited from the FileStream class.) Gets the length (in bytes) of the stream. (Inherited from the Stream class.) Gets the name of the file. (Inherited from the FileStream class.) Gets or sets the virtual cursor for determining where in the stream the current position is. The value of Position cannot be greater than the stream s length. (Inherited from the Stream class.) Gets or sets the stream s timeout for read operations. (Inherited from the Stream class.) Gets or sets the stream s timeout for write operations. (Inherited from the Stream class.)
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