StringBuilder Constructor (String, Int32, Int32, Int32) (System.Text)

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.NET Framework Class Library
StringBuilder Constructor (String, Int32, Int32, Int32)

Initializes a new instance of the StringBuilder class from the specified substring and capacity.

Namespace:  System.Text
Assembly:  mscorlib (in mscorlib.dll)
Syntax
Visual Basic
Public Sub New ( _
	value As String, _
	startIndex As Integer, _
	length As Integer, _
	capacity As Integer _
)
C#
public StringBuilder(
	string value,
	int startIndex,
	int length,
	int capacity
)
Visual C++
public:
StringBuilder(
	String^ value, 
	int startIndex, 
	int length, 
	int capacity
)
F#
new : 
        value:string * 
        startIndex:int * 
        length:int * 
        capacity:int -> StringBuilder

Parameters

value
Type: System.String
The string that contains the substring used to initialize the value of this instance. If value is null, the new StringBuilder will contain the empty string (that is, it contains Empty).
startIndex
Type: System.Int32
The position within value where the substring begins.
length
Type: System.Int32
The number of characters in the substring.
capacity
Type: System.Int32
The suggested starting size of the StringBuilder.
Exceptions
Exception Condition
ArgumentOutOfRangeException

capacity is less than zero.

-or-

startIndex plus length is not a position within value.

Remarks

The capacity parameter defines the maximum number of characters that can be stored in the memory allocated by the current instance. Its value is assigned to the Capacity property. If the number of characters to be stored in the current instance exceeds this capacity value, the StringBuilder object allocates additional memory to store them.

If capacity is zero, the implementation-specific default capacity is used.

Examples

The following example demonstrates how to call the StringBuilder constructor with the specified string.

Visual Basic

Dim initialString As String = "Initial string for stringbuilder."
Dim startIndex As Integer = 0
Dim substringLength As Integer = 14
Dim capacity As Integer = 255
Dim stringBuilder As New StringBuilder(initialString, _
    startIndex, substringLength, capacity)
C#

string initialString = "Initial string for stringbuilder.";
int startIndex = 0;
int substringLength = 14;
int capacity = 255;
StringBuilder stringBuilder = new StringBuilder(initialString, 
    startIndex, substringLength, capacity);
Visual C++

String^ initialString = L"Initial string for stringbuilder.";
int startIndex = 0;
int substringLength = 14;
int capacity = 255;
StringBuilder^ stringBuilder = gcnew StringBuilder(
   initialString,startIndex,substringLength,capacity );
Version Information

.NET Framework

Supported in: 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
Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

StringBuilder Class
StringBuilder Overload
System.Text Namespace
Capacity