Streamwriter

StreamWriter. This helpful C# class writes text data and files. It enables easy and efficient text output. It is one of the first choices for file output in C#.StreamReaderFileUsing statements. StreamWriter is best placed in a using-statement. This ensures it is removed from memory when no longer needed. The syntax is easy to use once it is familiar.First example. We first declare and initialize a new StreamWriter instance in a using construct. Please note how the System.IO namespace is included at the top of the file.namespaceImportant The "using" keyword means different things in different places. Near StreamWriter, it controls low-level resource usage.usingHere A new StreamWriter is initialized with the file name "important.txt". Three writes are done using StreamWriter.Info The Write method does not append a newline. The WriteLine methods append a newline "\r\n" at each call.using System.IO;using (StreamWriter writer = new StreamWriter("important.txt")){ writer.Write("Word "); writer.WriteLine("word 2"); writer.WriteLine("Line");}(Text is in "important.txt" file.)Word word 2LineAppend text. It is easy to append text to a file with StreamWriter. The file is not erased, but just reopened and new text is added to the end. We also see how you can specify a full path.Start A new StreamWriter is initialized and it opens "C:\log.txt" for appending. The second argument (true) specifies an append operation.Next The first line is appended to the file. If it is empty, the file begins with that string.Then The second using construct reopens the "C:\log.txt" file and appends another string to it.Note If for some reason the file was deleted, the line will be added just the same.using System.IO;// Write single line to new file.using (StreamWriter writer = new StreamWriter("C:\\log.txt", true)){ writer.WriteLine("Important data line 1");}// Append line to the file.using (StreamWriter writer = new StreamWriter("C:\\log.txt", true)){ writer.WriteLine("Line 2");}(File "log.txt" contains these lines.)Important data line 1Line 2Loop. Often we need to write out an array or List of strings. A good solution is to put the loop inside the using statement. This avoids creating more than one file handle in Windows.forTip We use var, which makes the syntax shorter but equivalent in functionality. The file "loop.txt" is opened only once for writing.varDetail The format string can be easily used with Write. You have to specify a substitution marker {0} in the first parameter.string.Formatusing System.IO;// Use var type which is shorter.using (var writer = new StreamWriter("loop.txt")){ // Loop through ten numbers. for (int i = 0; i // Write format string to

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File. writer.Write("{0:0.0} ", i); }}(These numbers are in the file "loop.txt".)0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0String interpolation. This syntax can be used to directly insert variables into a string before it is written with Write or WriteLine. We use the "$" char before the string.Note String interpolation is about as fast as the older format syntax—it is a good alternative.String Interpolationusing System.IO;using (StreamWriter writer = new StreamWriter("C:\\programs\\file.txt")){ string animal = "cat"; int size = 12; // Use string interpolation syntax to make code clearer. writer.WriteLine($"The {animal} is {size} pounds.");}The cat is 12 pounds.Summary. With the using-statement and StreamWriter, we wrote text files. StreamWriter is an excellent class—it is useful for many C# developers.Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.This page was last updated on Nov 10, 2023 (simplify).

// To change the text encoding, pass the desired encoding as the second parameter. // For example, new StreamWriter(cryptoStream, Encoding.Unicode). using (StreamWriter encryptWriter = new(cryptoStream)) { encryptWriter.WriteLine("Hello World!"); } } } } Console.WriteLine("The file was encrypted.");}catch (Exception ex){ Console.WriteLine($"The encryption failed. {ex}");}Imports SystemImports System.IOImports System.Security.CryptographyModule Module1 Sub Main() Try ' Create a file stream Using fileStream As New FileStream("TestData.txt", FileMode.OpenOrCreate) ' Create a new instance of the default Aes implementation class ' and configure encryption key. Using aes As Aes = Aes.Create() 'Encryption key used to encrypt the stream. 'The same value must be used to encrypt and decrypt the stream. Dim key As Byte() = { &H1, &H2, &H3, &H4, &H5, &H6, &H7, &H8, &H9, &H10, &H11, &H12, &H13, &H14, &H15, &H16 } aes.Key = key ' Stores IV at the beginning of the file. ' This information will be used for decryption. Dim iv As Byte() = aes.IV fileStream.Write(iv, 0, iv.Length) ' Create a CryptoStream, pass it the FileStream, and encrypt ' it with the Aes class. Using cryptoStream As New CryptoStream(fileStream, aes.CreateEncryptor(), CryptoStreamMode.Write) ' By default, the StreamWriter uses UTF-8 encoding. ' To change the text encoding, pass the desired encoding as the second parameter. ' For example, New StreamWriter(cryptoStream, Encoding.Unicode). Using sWriter As New StreamWriter(cryptoStream) 'Write to the stream. sWriter.WriteLine("Hello World!") End Using End Using End Using End Using 'Inform the user that the message was written 'to the stream. Console.WriteLine("The text was encrypted.") Catch 'Inform the user that an exception was raised. Console.WriteLine("The encryption failed.") Throw End Try End SubEnd ModuleChoose an algorithmYou can select an algorithm for different reasons: for example, for data integrity, for data privacy, or to generate a key. Symmetric and hash algorithms are intended for protecting data for either integrity reasons (protect from change) or privacy reasons (protect from viewing).

Used methods of this class −Sr.No.Method Name & Purpose1Public Overrides Sub CloseCloses the current StreamWriter object and the underlying stream.2Public Overrides Sub FlushClears all buffers for the current writer and causes any buffered data to be written to the underlying stream.3Public Overridable Sub Write (value As Boolean)Writes the text representation of a Boolean value to the text string or stream. (Inherited from TextWriter.)4Public Overrides Sub Write (value As Char)Writes a character to the stream.5Public Overridable Sub Write (value As Decimal)Writes the text representation of a decimal value to the text string or stream.6Public Overridable Sub Write (value As Double)Writes the text representation of an 8-byte floating-point value to the text string or stream.7Public Overridable Sub Write (value As Integer)Writes the text representation of a 4-byte signed integer to the text string or stream.8Public Overrides Sub Write (value As String)Writes a string to the stream.9Public Overridable Sub WriteLineWrites a line terminator to the text string or stream.The above list is not exhaustive. For complete list of methods please visit Microsoft's documentationExampleThe following example demonstrates writing text data into a file using the StreamWriter class −Imports System.IOModule fileProg Sub Main() Dim names As String() = New String() {"Zara Ali", _ "Nuha Ali", "Amir Sohel", "M Amlan"} Dim s As String Using sw As StreamWriter = New StreamWriter("names.txt") For Each s In names sw.WriteLine(s) Next s End Using ' Read and show each line from the file. Dim line As String Using sr As StreamReader = New StreamReader("names.txt") line = sr.ReadLine() While (line Nothing) Console.WriteLine(line) line = sr.ReadLine() End While End Using Console.ReadKey() End SubEnd ModuleWhen the above code is compiled and executed, it produces the following result −Zara AliNuha AliAmir SohelM Amlan vb.net_file_handling.htm