Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

StreamWriter.WriteAsync Method (String)

.NET Framework (current version)
 

Writes a string to the stream asynchronously.

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

<ComVisibleAttribute(False)>
<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading := True)>
Public Overrides Function WriteAsync (
	value As String
) As Task

Parameters

value
Type: System.String

The string to write to the stream. If value is null, nothing is written.

Return Value

Type: System.Threading.Tasks.Task

A task that represents the asynchronous write operation.

Exception Condition
ObjectDisposedException

The stream writer is disposed.

InvalidOperationException

The stream writer is currently in use by a previous write operation.

The following example shows how to write a string to a text file by using the WriteAsync(String) method.

Imports System.IO
Imports System.Text

Module Module1

    Sub Main()
        WriteCharacters()
    End Sub

    Async Sub WriteCharacters()

        Using writer As StreamWriter = File.CreateText("newfile.txt")
            Await writer.WriteAsync("Example text as string")
        End Using
    End Sub
End Module

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Return to top
Show: