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Reads a ushort, uint, or ulong value
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Reads a string from the underlying stream
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Compiling and running Listing 20-21 produces the following results: Read bool value: True Read float value: 23.2 Read string value: Hello World Read int value: 20172 Press enter to finish
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CHAPTER 20 FILES, STREAMS, AND IO
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Reading and Writing Textual Data
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The StreamWriter and StreamReader classes are similar to BinaryWriter and BinaryReader, except they write text representations of values to the underlying stream, rather than binary representations. The StreamWriter class has a number of constructors, the most useful of which are shown in Table 20-30. Table 20-30. StreamWriter Constructors
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Constructor
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StreamWriter(Stream) StreamWriter(string)
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Description
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Creates a StreamWriter backed by the Stream parameter. Creates a StreamWriter that writes to the file specified by the string parameter. Creates a StreamWriter that writes to the specified file. If the bool parameter is true, new data is appended to the end of the file; if it is false, any existing data will be overwritten.
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StreamWriter(string, bool)
Once you have created a StreamWriter, you can use the methods described in Table 20-31 to write data. Table 20-31. StreamWriter WriteLine Methods
Method
WriteLine() WriteLine(bool) WriteLine(char) WriteLine(char[]) WriteLine(double) WriteLine(decimal) WriteLine(Int32) WriteLine(Int64) WriteLine(UInt32) WriteLine(UInt64) WriteLine(object)
Description
Writes an empty line to the stream. Writes a bool, followed by a line terminator, to the stream. Writes a char, followed by a line terminator, to the stream. Writes a char array, followed by a line terminator, to the stream. Writes a double or decimal value, followed by a line terminator, to the stream. Writes an int, long, uint, or ulong value to the stream, followed by a line terminator.
Writes the string representation of the object parameter to the stream, followed by a line terminator. Writes a string to the stream, followed by a line terminator.
WriteLine(string)
CHAPTER 20 FILES, STREAMS, AND IO
Method
WriteLine(string, object)
Description
Uses composite formatting to format the string and writes the result to the stream, followed by a line terminator. See 16 for details of composite formatting.
When you use one of these methods, the value and a line terminator character are written to the stream. If you are writing to a text file, this means that there is one string written to each line in the file. Listing 20-22 provides an example. Listing 20-22. Using a StreamWriter using System; using System.IO; class Listing 22 { static void Main(string[] args) { // create a temporary file name string path = Path.GetRandomFileName(); // create a StreamWriter StreamWriter myWriter = new StreamWriter(path); // write some values to the stream myWriter.WriteLine("Hello, World"); myWriter.WriteLine(true); myWriter.WriteLine(20172); myWriter.WriteLine(12.345D); // flush and close the writer myWriter.Flush(); myWriter.Close(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling and running Listing 20-22 produces a text file that has the following contents: Hello, World True 20172 12.345
CHAPTER 20 FILES, STREAMS, AND IO
Listing 20-23 demonstrates using the StreamReader class. Listing 20-23. Using the StreamReader Class using System; using System.IO; class Listing 23 { static void Main(string[] args) { // create a backing stream MemoryStream memStream = new MemoryStream(); // create a StreamWriter StreamWriter myWriter = new StreamWriter(memStream); // write some values to the stream myWriter.WriteLine("Hello, World"); myWriter.WriteLine(true); myWriter.WriteLine(20172); myWriter.WriteLine(12.345D); // flush the data myWriter.Flush(); // reposition the cursor in the backing stream memStream.Seek(0, SeekOrigin.Begin); // create a stream reader StreamReader myReader = new StreamReader(memStream); // read the strings string value; while ((value = myReader.ReadLine()) != null) { Console.WriteLine("Read Line: {0}", value); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 20-23 uses the StreamReader class to read back the string values written by the StreamWriter class. The ReadLine method returns the next string in the underlying stream or null if the end of the stream has been reached. Compiling and running Listing 20-23 produces the following results: Read Line: Hello, World
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