StringBuilder.Append Method (Double)

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)


Public Function Append ( _
    value As Double _
) As StringBuilder
public StringBuilder Append(
    double value


Return Value

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


Exception Condition

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


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


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


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

Change History




January 2011

Expanded the Remarks section and removed the example.

Customer feedback.