StreamWriter.Null Field
Provides a StreamWriter with no backing store that can be written to, but not read from.
[Visual Basic] Public Shared ReadOnly Null As StreamWriter [C#] public static readonly StreamWriter Null; [C++] public: static StreamWriter* Null; [JScript] public static var Null : StreamWriter;
Remarks
Use Null to redirect output to a StreamWriter that will not consume any operating system resources.
When the StreamWriter.Write methods are invoked on Null, the call simply returns, and no data is actually written to any backing store.
For an example of using this field, see the Example section below. The following table lists examples of other typical or related I/O tasks.
| To do this... | See the example in this topic... |
|---|---|
| Create a text file. | Writing Text to a File |
| Write to a text file. | Writing Text to a File |
| Read from a text file. | Reading Text from a File |
| Append text to a file. | Opening and Appending to a Log File |
| Get the size of a file. | FileInfo.Length |
| Get the attributes of a file. | File.GetAttributes |
| Set the attributes of a file. | File.SetAttributes |
| Determine if a file exists. | File.Exists |
| Read from a binary file. | Reading and Writing to a Newly Created Data File |
| Write to a binary file. | Reading and Writing to a Newly Created Data File |
Example
[Visual Basic, C#, C++] The following example demonstrates a use of the Null field.
[Visual Basic] If Sw.Equals(StreamWriter.Null) Then Sw.WriteLine("The store can be written to, but not read from.") End If [C#] if(sw.Equals(StreamWriter.Null)) { sw.WriteLine("The store can be written to, but not read from."); } [C++] if(sw->Equals(StreamWriter::Null)) { sw->WriteLine(S"The store can be written to, but not read from."); }
[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework
See Also
StreamWriter Class | StreamWriter Members | System.IO Namespace | Working with I/O | Reading Text from a File | Writing Text to a File