项目
11/18/2011

StringBuilder.Append Method (Char)

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

Appends the string representation of a specified Unicode character to the end of this instance.

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

Syntax

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

public StringBuilder Append(
    char value
)

Parameters

value
Type: System.Char
The Unicode character 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 str As String = "Characters in a string."
Dim sb As New System.Text.StringBuilder()
For Each ch In str
   sb.Append(" '").Append(ch).Append("' ")
Next
outputBlock.Text += "Characters in the string:" + vbCrLf
outputBlock.Text += String.Format("  {0}", sb) + vbCrLf
' The example displays the following output:
'    Characters in the string:
'       'C'  'h'  'a'  'r'  'a'  'c'  't'  'e'  'r'  's'  ' '  'i'  'n'  ' '  'a'  ' '  's'  't' 'r'  'i'  'n'  'g'  '.'

string str = "Characters in a string.";
System.Text.StringBuilder sb = new System.Text.StringBuilder();
foreach (var ch in str)
   sb.Append(" '").Append(ch).Append("' ");

outputBlock.Text += "Characters in the string:\n";
outputBlock.Text += String.Format("  {0}\n", sb);
// The example displays the following output:
//    Characters in the string:
//       'C'  'h'  'a'  'r'  'a'  'c'  't'  'e'  'r'  's'  ' '  'i'  'n'  ' '  'a'  ' '  's'  't' 'r'  'i'  'n'  'g'  '.'

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

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