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File.WriteAllBytes Method

.NET Framework 4

Creates a new file, writes the specified byte array to the file, and then closes the file. If the target file already exists, it is overwritten.

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

Syntax

C++

Copy

public static void WriteAllBytes(
	string path,
	byte[] bytes
)

Parameters

path: Type: System.String
The file to write to.

bytes: Type: System.Byte[]
The bytes to write to the file.

Exceptions

Exception	Condition
ArgumentException	path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.
ArgumentNullException	path is null or the byte array is empty.
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).
IOException	An I/O error occurred while opening the file.
UnauthorizedAccessException	path specified a file that is read-only. -or- This operation is not supported on the current platform. -or- path specified a directory. -or- The caller does not have the required permission.
FileNotFoundException	The file specified in path was not found.
NotSupportedException	path is in an invalid format.
SecurityException	The caller does not have the required permission.

Remarks

Given a byte array and a file path, this method opens the specified file, writes the contents of the byte array to the file, and then closes the file.

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET Framework Security

FileIOPermission
for access to write to a file or directory. Associated enumeration: FileIOPermissionAccess.Write

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

File Class

System.IO Namespace

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