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StringBuilder.EnsureCapacity Method

Ensures that the capacity of this instance of StringBuilder is at least the specified value.

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

member EnsureCapacity : 
        capacity:int -> int 


Type: System.Int32
The minimum capacity to ensure.

Return Value

Type: System.Int32
The new capacity of this instance.


capacity is less than zero.


Enlarging the value of this instance would exceed MaxCapacity.

If the current capacity is less than the capacity parameter, memory for this instance is reallocated to hold at least capacity number of characters; otherwise, no memory is changed.

The following example demonstrates the EnsureCapacity method.

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

.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

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.