FileStream.Length Property

Reference

Definition

Namespace:: System.IO

Assemblies:: mscorlib.dll, System.IO.FileSystem.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.IO.FileSystem.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: FileStream.cs

Source:: FileStream.cs

Source:: FileStream.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets the length in bytes of the stream.

public:
 virtual property long Length { long get(); };

public override long Length { get; }

member this.Length : int64

Public Overrides ReadOnly Property Length As Long

Property Value

Int64

A long value representing the length of the stream in bytes.

Exceptions

NotSupportedException

CanSeek for this stream is false.

IOException

An I/O error, such as the file being closed, occurred.

Examples

The following example uses the Length and Position properties to check for an end-of-file condition.

if ( s->Length == s->Position )
{
   Console::WriteLine( "End of file has been reached." );
}

if( s.Length==s.Position )
{
   Console.WriteLine("End of file has been reached.");
}

if s.Length = s.Position then
    printfn "End of file has been reached."

If s.Length = s.Position Then
    Console.WriteLine("End of file has been reached.")
End If

Remarks

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

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.3, 1.4, 1.6, 2.0, 2.1
UWP	10.0

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