StreamWriter.WriteLineAsync Method (Char, Int32, Int32)
Writes a subarray of characters followed by a line terminator asynchronously to the stream.
Assembly: mscorlib (in mscorlib.dll)
[<ComVisibleAttribute(false)>] [<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)>] abstract WriteLineAsync : buffer:char * index:int * count:int -> Task [<ComVisibleAttribute(false)>] [<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)>] override WriteLineAsync : buffer:char * index:int * count:int -> Task
- Type: System.Char
The character array to write data from.
- Type: System.Int32
The character position in the buffer at which to start reading data.
- Type: System.Int32
The maximum number of characters to write.
Return ValueType: System.Threading.Tasks.Task
A task that represents the asynchronous write operation.
buffer is a null reference (Nothing in Visual Basic).
The index plus count is greater than the buffer length.
index or count is negative.
The stream writer is disposed.
The stream writer is currently in use by a previous write operation.
The line terminator is defined by the TextWriter.NewLine property.
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.
The following example shows how to write characters to two separate lines in a text file by using the method. The first line contains the first 11 characters from the string (the letters "First line" followed by a space). The second line contains the remaining characters from the string (the letters "and second line").
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)