StringBuilder Constructor (String, Int32, Int32, Int32)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

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


Public Sub New ( _
    value As String, _
    startIndex As Integer, _
    length As Integer, _
    capacity As Integer _
public StringBuilder(
    string value,
    int startIndex,
    int length,
    int capacity


  • value
    Type: System..::.String
    The string that contains the substring used to initialize the value of this instance. If value is nullNothingnullptra null reference (Nothing in Visual Basic), 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.


Exception Condition

capacity is less than zero.


startIndex plus length is not a position within value.


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


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

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

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


StringBuilder Class

StringBuilder Overload

System.Text Namespace