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IsolatedStorageFileStream.IsolatedStorageFileStream(String, FileMode, FileAccess, IsolatedStorageFile) Constructor

Initializes a new instance of the IsolatedStorageFileStream class giving access to the file designated by path in the specified mode, with the specified file access, and in the context of the IsolatedStorageFile specified by isf.

Namespace: System.IO.IsolatedStorage
Assembly: mscorlib (in mscorlib.dll)

public IsolatedStorageFileStream (
	string path,
	FileMode mode,
	FileAccess access,
	IsolatedStorageFile isf
public IsolatedStorageFileStream (
	String path, 
	FileMode mode, 
	FileAccess access, 
	IsolatedStorageFile isf
public function IsolatedStorageFileStream (
	path : String, 
	mode : FileMode, 
	access : FileAccess, 
	isf : IsolatedStorageFile
Not applicable.



The relative path of the file within isolated storage.


One of the FileMode values.


A bitwise combination of the FileAccess values.


The IsolatedStorageFile in which to open the IsolatedStorageFileStream.

Exception typeCondition


The path is badly formed.


The path is a null reference (Nothing in Visual Basic).


No file was found and the mode is set to Open.


isf does not have a quota.

The mode parameter indicates whether a new file should be created or an existing one used. The access parameter includes read-only, read/write, and write-only.

Caution noteCaution:

When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and can cause an exception to be thrown.

The following code example demonstrates the use of this constructor. For the complete context of this example, see the IsolatedStorageFileStream overview.

IsolatedStorageFile isoFile;
isoFile = IsolatedStorageFile.GetUserStoreForDomain();

// Open or create a writable file.
IsolatedStorageFileStream isoStream =
    new IsolatedStorageFileStream(this.userName,

StreamWriter writer = new StreamWriter(isoStream);
// Calculate the amount of space used to record the user's preferences.
double d = isoFile.CurrentSize / isoFile.MaximumSize;
Console.WriteLine("CurrentSize = " + isoFile.CurrentSize.ToString());
Console.WriteLine("MaximumSize = " + isoFile.MaximumSize.ToString());
// StreamWriter.Close implicitly closes isoStream.
return d;

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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