C# StringWriter Class

Use the StringWriter type from the System.IO alongside the StringBuilder.

StringWriter is used with HtmlTextWriter. A StringWriter instance is required in the constructor. In code that uses StringWriter, you can also use the internal StringBuilder. This allows you to convert method return values to string types.StringReader StringBuilder

Example. Let's begin by looking at a complete console program that uses StringWriter. The StringWriter type is implemented with an internal StringBuilder, giving it excellent performance in most scenarios involving looping.

Main: We declare a new StringWriter—which always has an internal StringBuilder. We use the StringWriter mainly for the HtmlTextWriter.

HtmlTextWriter

GetStringBuilder: This method is used to pass a reference to the WriteMarkup method. StringBuilder is much more common than StringWriter.

Tip: It is best to reuse buffers and write one piece at a time. This avoids allocations and improves performance.

C# program that uses StringWriter using System; using System.IO; using System.Text; using System.Web.UI; class Program { static void Main() { // Example string data string[] arr = new string[] { "One", "Two", "Three" }; // Write markup and strings to StringWriter StringWriter stringWriter = new StringWriter(); using (HtmlTextWriter writer = new HtmlTextWriter(stringWriter)) { foreach (string item in arr) { writer.RenderBeginTag(HtmlTextWriterTag.Div); // Send internal StringBuilder to markup method. WriteMarkup(item, stringWriter.GetStringBuilder()); writer.RenderEndTag(); } } Console.WriteLine(stringWriter.ToString()); } /// <summary> /// Writes to StringBuilder parameter /// </summary> static void WriteMarkup(string sourceString, StringBuilder builder) { builder.Append("Some").Append(" text"); } } Output <div> Some text </div><div> Some text </div><div> Some text </div>

StringBuilder. We have shown that using StringBuilder as an argument is an excellent approach—the approach presented above is an extension of that. There are minimal wasted CPU cycles due to excessive object creation.

Summary. We saw an example of StringWriter and its buffer in the C# language. When working with a buffer or StringBuilder, it is a good idea to always write new content to the same buffer. We try not to create temporary strings when not needed.

Review: We combined several types—HtmlTextWriter, StringWriter and StringBuilder—into working, efficient code.

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C# StringWriter Class

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