How to VB.NET String.CopyTo()

The CopyTo method in VB.NET's String Class provides a convenient way to copy a specified number of characters from a given starting position within a string to a designated position in an array of characters.

CopyTo method

By utilizing the CopyTo method, you can specify the starting index within the source string from where the copying should begin. Additionally, you can indicate the target array of characters and the starting index within that array where the copied characters should be placed.

This method facilitates the extraction of a subset of characters from a string and transfers them to a character array for further processing or manipulation. It offers flexibility and control over the copying process, enabling developers to precisely extract and transfer the desired characters.

System.String.CopyTo(ByVal sourceIndex As Integer, ByVal destination() As Char, ByVal destinationIndex As Integer, ByVal count As Integer)
Parameters:
  1. Integer sourceIndex : The starting position of the source String.
  2. Char destination() : The character Array.
  3. Integer destinationIndex : Array element in the destination.
  4. Integer count : The number of characters to destination.
Exceptions: System.ArgumentNullException : If the destination is null System.ArgumentOutOfRangeException :
  1. Source Index, DestinationIndes or Count is a -ve value.
  2. Count is greater than the length of the substring from startIndex to the end of this instance.
  3. Count is greater than the length of the subarray from destinationIndex to the end of destination.

The CopyTo method enhances the versatility of string handling in VB.NET by allowing developers to efficiently transfer portions of strings to character arrays. It provides a mechanism for extracting and isolating specific segments of a string, facilitating advanced operations such as string manipulation, analysis, or customized transformations.

Full Source VB.NET
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim str1 As String = "CopyTo() sample" Dim chrs(5) As Char str1.CopyTo(0, chrs, 0, 6) MsgBox(chrs(0) + chrs(1) + chrs(2) + chrs(3) + chrs(4) + chrs(5)) End Sub End Class

Conclusion

The CopyTo method in the VB.NET String Class empowers developers to selectively copy a specified number of characters from a given position within a string to a designated position in an array of characters. This functionality expands the possibilities of string manipulation, enabling the extraction and transfer of desired segments for further processing in VB.NET applications.






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