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StringBuilder::Append Method (String, Int32, Int32)

Appends a copy of a specified substring to this instance.

Namespace:  System.Text
Assembly:  mscorlib (in mscorlib.dll)
public:
StringBuilder^ Append(
	String^ value, 
	int startIndex, 
	int count
)

Parameters

value
Type: System::String

The string that contains the substring to append.

startIndex
Type: System::Int32

The starting position of the substring within value.

count
Type: System::Int32

The number of characters in value to append.

Return Value

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

value is nullptr, and startIndex and count are not zero.

ArgumentOutOfRangeException

count less than zero.

-or-

startIndex less than zero.

-or-

startIndex + count is greater than the length of value.

-or-

Enlarging the value of this instance would exceed MaxCapacity.

This method appends the specified range of characters in value to the current instance. If value is nullptr and startIndex and count are both zero, no changes are made.

The Append(String, Int32, Int32) 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.

No code example is currently available or this language may not be supported.

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: 4.5.1, 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.

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