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File.OpenWrite Method

When it is called by trusted applications, opens an existing file for writing.

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

public static FileStream OpenWrite(
	string path
)

Parameters

path
Type: System.String
The file to be opened for writing.

Return Value

Type: System.IO.FileStream
An unshared FileStream object on the specified path with Write access.

ExceptionCondition
UnauthorizedAccessException

The caller does not have the required permission.

-or-

path specified a read-only file or directory.

ArgumentException

path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars.

ArgumentNullException

path is null.

PathTooLongException

The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.

DirectoryNotFoundException

The specified path is invalid, (for example, it is on an unmapped drive).

FileNotFoundException

The file specified in path was not found.

NotSupportedException

path is in an invalid format.

For more information about trusted applications, see Trusted Applications.

Platform Notes

Silverlight for Windows Phone Silverlight for Windows Phone

 This member has a SecurityCriticalAttribute attribute on Silverlight for Windows Phone, because the attribute was present in Silverlight 3. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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