StringBuilder.Insert Method (Int32, String, Int32)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Inserts one or more copies of a specified string into this instance at the specified character position.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Function Insert ( _ index As Integer, _ value As String, _ count As Integer _ ) As StringBuilder
Parameters
- index
- Type: System.Int32
The position in this instance where insertion begins.
- value
- Type: System.String
The string to insert.
- count
- Type: System.Int32
The number of times to insert value.
Return Value
Type: System.Text.StringBuilderA reference to this instance after insertion has completed.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than zero or greater than the current length of this instance. -or- count is less than zero. |
| OutOfMemoryException | The current length of this StringBuilder object plus the length of value times count exceeds the maximum capacity of this instance. |
Existing characters are shifted to make room for the new text. The capacity of this instance is adjusted as needed.
This StringBuilder object is not changed if value is Nothing, value is not Nothing but its length is zero, or count is zero.
The following code example demonstrates the Insert method.
Imports System.Text Class Example ' index: 012345 Private Shared initialValue As String = "--[]--" Private Shared sb As StringBuilder Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock) Dim xyz As String = "xyz" Dim abc As Char() = {"a"c, "b"c, "c"c} Dim star As Char = "*"c Dim obj As [Object] = 0 Dim xBool As Boolean = True Dim xByte As Byte = 1 Dim xInt16 As Short = 2 Dim xInt32 As Integer = 3 Dim xInt64 As Long = 4 Dim xDecimal As [Decimal] = 5 Dim xSingle As Single = 6.6F Dim xDouble As Double = 7.7 ' The following types are not CLS-compliant. ' Dim xUInt16 As System.UInt16 = 8 ' Dim xUInt32 As System.UInt32 = 9 ' Dim xUInt64 As System.UInt64 = 10 ' Dim xSByte As System.SByte = - 11 ' outputBlock.Text &= "StringBuilder.Insert method" & vbCrLf sb = New StringBuilder(initialValue) sb.Insert(3, xyz, 2) Show(outputBlock, 1, sb) sb.Insert(3, xyz) Show(outputBlock, 2, sb) sb.Insert(3, star) Show(outputBlock, 3, sb) sb.Insert(3, abc) Show(outputBlock, 4, sb) sb.Insert(3, abc, 1, 2) Show(outputBlock, 5, sb) sb.Insert(3, xBool) ' True Show(outputBlock, 6, sb) sb.Insert(3, obj) ' 0 Show(outputBlock, 7, sb) sb.Insert(3, xByte) ' 1 Show(outputBlock, 8, sb) sb.Insert(3, xInt16) ' 2 Show(outputBlock, 9, sb) sb.Insert(3, xInt32) ' 3 Show(outputBlock, 10, sb) sb.Insert(3, xInt64) ' 4 Show(outputBlock, 11, sb) sb.Insert(3, xDecimal) ' 5 Show(outputBlock, 12, sb) sb.Insert(3, xSingle) ' 6.6 Show(outputBlock, 13, sb) sb.Insert(3, xDouble) ' 7.7 Show(outputBlock, 14, sb) ' The following Insert methods are not CLS-compliant. ' sb.Insert(3, xUInt16) ' 8 ' sb.Insert(3, xUInt32) ' 9 ' sb.Insert(3, xUInt64) ' 10 ' sb.Insert(3, xSByte) ' -11 End Sub 'Main Public Shared Sub Show(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal overloadNumber As Integer, ByVal sbs As StringBuilder) outputBlock.Text += String.Format("{0,2:G} = {1}", overloadNumber, sbs.ToString()) & vbCrLf sb = New StringBuilder(initialValue) End Sub 'Show End Class 'Sample ' 'This example produces the following results: ' 'StringBuilder.Insert method ' 1 = --[xyzxyz]-- ' 2 = --[xyz]-- ' 3 = --[*]-- ' 4 = --[abc]-- ' 5 = --[bc]-- ' 6 = --[True]-- ' 7 = --[0]-- ' 8 = --[1]-- ' 9 = --[2]-- '10 = --[3]-- '11 = --[4]-- '12 = --[5]-- '13 = --[6.6]-- '14 = --[7.7]-- '