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FileStream.Seek Method

Sets the current position of this stream to the given value.

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

abstract Seek : 
        offset:int64 * 
        origin:SeekOrigin -> int64  
override Seek : 
        offset:int64 * 
        origin:SeekOrigin -> int64

Parameters

offset
Type: System.Int64

The point relative to origin from which to begin seeking.

origin
Type: System.IO.SeekOrigin

Specifies the beginning, the end, or the current position as a reference point for offset, using a value of type SeekOrigin.

Return Value

Type: System.Int64
The new position in the stream.

ExceptionCondition
IOException

An I/O error occurred.

NotSupportedException

The stream does not support seeking, such as if the FileStream is constructed from a pipe or console output.

ArgumentException

Seeking is attempted before the beginning of the stream.

ObjectDisposedException

Methods were called after the stream was closed.

This method overrides Stream.Seek.

NoteNote

Use the FileStream.CanSeek property to determine whether the current instance supports seeking. For additional information, see Stream.CanSeek.

You can seek to any location beyond the length of the stream. When you seek beyond the length of the file, the file size grows. In Windows NT and later versions, data added to the end of the file is set to zero. In Windows 98 or earlier versions, data added to the end of the file is not set to zero, which means that previously deleted data is visible to the stream.

For a list of common file and directory operations, see Common I/O Tasks.

The following example shows how to write data to a file, byte by byte, and then verify that the data was written correctly.

No code example is currently available or this language may not be supported.

The following example reads text in the reverse direction, from the end of file to the beginning of the file, by using the various SeekOrigin values with the Seek method.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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