error converting a string to double

Question

I'm trying to convert a string to double in Visual Basic, but I keep getting this error:

System.InvalidCastException: 'Conversion from string "48.00 " to type 'Double' is not valid.'

This is my code:

Private Sub ratingupdater_Tick(sender As Object, e As EventArgs) Handles ratingupdater.Tick
        If hum = "" Then
            Return
        End If
        If temp = "" Then
            Return
        End If
        If hum = "NAN" Then
            Return
        End If
        If temp = "NAN" Then
            Return
        End If
        'humidity Rating
        Dim tempolary As Double
        tempolary = CDbl(hum)
        tempval.Text = tempolary
        If tempolary > 75 Then
            humrating.Text = "High"
            humrating.ForeColor = Color.Red
        End If
        If tempolary >= 65 And tempolary < 75 Then
            humrating.Text = "Mid"
            humrating.ForeColor = Color.Orange
        End If
        If tempolary < 65 Then
            humrating.Text = "Low"
            humrating.ForeColor = Color.Green
        End If
        tempolary = 0
    End Sub

(hum is a string)

score 0 · Accepted Answer · answered Oct 22 '17 at 11:37

0

Try Double.Parse(hum) in your code

answered Oct 22 '17 at 11:37

Rahul Cv

725
5
12

I just tried it and now I'm getting this error: System.FormatException: 'Input string was not in a correct format.'. – br0kenpixel Oct 22 '17 at 11:40
What is the actual value of hum u are passing – Rahul Cv Oct 22 '17 at 11:42
hum is "48.0 " I'm reading it from a Arduino serial connection. – br0kenpixel Oct 22 '17 at 11:44
Hum contain spaces I guess trim the spaces before passing it to function – Rahul Cv Oct 22 '17 at 11:51
1

I fixed the error using Double.Parse(hum).Replace(".", ","). Thanks – br0kenpixel Oct 22 '17 at 11:55

error converting a string to double

1 Answers1