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StringWriter Constructor (StringBuilder)

Initializes a new instance of the StringWriter class that writes to the specified StringBuilder.

Namespace:  System.IO
Assemblies:   mscorlib (in mscorlib.dll)
  System.IO (in System.IO.dll)

public StringWriter(
	StringBuilder sb
)

Parameters

sb
Type: System.Text.StringBuilder

The StringBuilder object to write to.

ExceptionCondition
ArgumentNullException

sb is null.

Since a format control is not specified for this constructor, the new instance will be initialized with CultureInfo.CurrentCulture.

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.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Append text to a file.

How to: Open and Append to a Log File

File.AppendText

FileInfo.AppendText

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.

How to: Read and Write to a Newly Created Data File

Write to a binary file.

How to: Read and Write to a Newly Created Data File

The following code example demonstrates using the StringBuilder class to modify the underlying string in a closed StringWriter.

using System;
using System.IO;
using System.Text;

class StrWriter
{
    static void Main()
    {
        StringBuilder strBuilder = 
            new StringBuilder("file path characters are: ");
        StringWriter strWriter = new StringWriter(strBuilder);

        strWriter.Write(
            Path.InvalidPathChars, 0, Path.InvalidPathChars.Length);

        strWriter.Close();

        // Since the StringWriter is closed, an exception will  
        // be thrown if the Write method is called. However,  
        // the StringBuilder can still manipulate the string.
        strBuilder.Insert(0, "Invalid ");
        Console.WriteLine(strWriter.ToString());
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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