项目
11/18/2011

StringBuilder Constructor (Int32)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Updated: August 2009

Initializes a new instance of the StringBuilder class using the specified capacity.

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

Syntax

'Declaration
Public Sub New ( _
    capacity As Integer _
)

public StringBuilder(
    int capacity
)

Parameters

capacity
Type: System.Int32
The suggested starting size of this instance.

Exceptions

Exception	Condition
ArgumentOutOfRangeException	capacity is less than zero.

Remarks

The capacity parameter defines the maximum number of characters that can be stored in the memory that is 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.

The string value of this instance is set to String.Empty. If capacity is 0 (zero), the implementation-specific default capacity is used.

Examples

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

Dim capacity As Integer = 255
Dim stringBuilder As New StringBuilder(capacity)

int capacity = 255;
StringBuilder stringBuilder = new StringBuilder(capacity);

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Change History

Date	History	Reason
August 2009	Expanded the Remarks section.	Customer feedback.

通过