Find the index of a char in string

Question

I have a string that goes like  abcdefg      I would like to find the index where the letter d is at  so I can get the number 3   I managed to do it by looping through each letter in the string  but that doesn t sound very convenient  Is there another way

User · Answer

Contanis occur if using the method of the present letter, and store the corresponding number using the IndexOf method, see example below.

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Dim myString As String = "abcdef"
    Dim numberString As String = String.Empty

    If myString.Contains("d") Then
        numberString = myString.IndexOf("d")
    End If
End Sub

Another sample with TextBox

  Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Dim myString As String = "abcdef"
    Dim numberString As String = String.Empty

    If myString.Contains(me.TextBox1.Text) Then
        numberString = myString.IndexOf(Me.TextBox1.Text)
    End If
End Sub

Regards

User · Answer

The String class exposes some methods to enable this  such as IndexOf and LastIndexOf  so that you may do this   Dim myText    abcde  Dim dIndex   myText IndexOf  d   If  dIndex  gt  -1  Then  End If

User · Answer

abcdefgh    IndexOf  d     returns 3  In general returns first occurrence index  if not present returns -1

[vb.net] Find the index of a char in string?

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