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FileStream::SetLength Method

Sets the length of this stream to the given value.

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

public:
virtual void SetLength(
	long long value
) override

Parameters

value
Type: System::Int64
The new length of the stream.

ExceptionCondition
IOException

An I/O error has occurred.

NotSupportedException

The stream does not support both writing and seeking.

ArgumentOutOfRangeException

Attempted to set the value parameter to less than 0.

This method overrides SetLength.

If the given value is less than the current length of the stream, the stream is truncated. If the given value is larger than the current length of the stream, the stream is expanded. If the stream is expanded, the contents of the stream between the old and the new length are undefined.

A stream must support both writing and seeking for SetLength to work.

NoteNote

Use the CanWrite property to determine whether the current instance supports writing, and the CanSeek property to determine whether seeking is supported. For additional information, see CanWrite and CanSeek.

For a list of common I/O tasks, see Common I/O Tasks.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.

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