Export (0) Print
Expand All

StringBuilder.Append Method (Object)

Appends the string representation of a specified object to this instance.

Namespace:  System.Text
Assembly:  mscorlib (in mscorlib.dll)

public StringBuilder Append(
	Object value
)

Parameters

value
Type: System.Object

The object to append.

Return Value

Type: System.Text.StringBuilder
A reference to this instance after the append operation has completed.

ExceptionCondition
ArgumentOutOfRangeException

Enlarging the value of this instance would exceed MaxCapacity.

The Append(Object) method modifies the existing instance of this class; it does not return a new class instance. Because of this, you can call a method or property on the existing reference and you do not have to assign the return value to a StringBuilder object, as the following example illustrates. It defines a Dog class, creates a Dog object, and makes three calls to the Append method to create a string that contains the dog's name and breed.

using System;

public class Dog
{
   private string dogBreed;
   private string dogName;

   public Dog(string name, string breed)
   {
      this.dogName = name;
      this.dogBreed = breed;
   }

   public string Breed {
      get { return this.dogBreed; }
   }

   public string Name {
      get { return this.dogName; }
   }

   public override string ToString()
   {
      return this.dogName;
   }
}

public class Example
{
   public static void Main()
   {
      Dog dog1 = new Dog("Yiska", "Alaskan Malamute");
      System.Text.StringBuilder sb = new System.Text.StringBuilder();     
      sb.Append(dog1).Append(", Breed: ").Append(dog1.Breed);  
      Console.WriteLine(sb);
   }
}
// The example displays the following output: 
//        Yiska, Breed: Alaskan Malamute

The Append(Object) method calls the Object.ToString method to get the string representation of value. If value is null, no changes are made to the StringBuilder object.

The capacity of this instance is adjusted as needed.

Notes to Callers

In the .NET Framework 4 and the .NET Framework 4.5, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append and AppendFormat methods to append small strings.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft