项目
11/18/2011

StringBuilder.Append Method (Double)

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

Updated: January 2011

Appends the string representation of a specified double-precision floating-point number to the end of this instance.

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

Syntax

'Declaration
Public Function Append ( _
    value As Double _
) As StringBuilder

public StringBuilder Append(
    double value
)

Parameters

value
Type: System.Double
The value to append.

Return Value

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

Exceptions

Exception	Condition
ArgumentOutOfRangeException	Enlarging the value of this instance would exceed its maximum capacity.

Remarks

The Append 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.

Dim value As Double = 1034769.47
Dim sb As New System.Text.StringBuilder()
sb.Append("*"c, 5).Append(value).Append("*"c, 5)
outputBlock.Text += sb.ToString() + vbCrLf
' The example displays the following output:
'       *****1034769.47*****

double value = 1034769.47;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append('*', 5).Append(value).Append('*', 5);
outputBlock.Text += sb + Environment.NewLine;
// The example displays the following output:
//       *****1034769.47*****

The Append method calls the Double.ToString(IFormatProvider) method to get the string representation of value for the current culture. To control the formatting of value, call the AppendFormat method.

The capacity of this instance is adjusted as needed.

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
January 2011	Expanded the Remarks section and removed the example.	Customer feedback.

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