Is it possible to recognize two commas entered into TextBox?

Question

I am asking for a code that will recognize two commas in one TextBox, so I can use double.Parse with no errors, cleaning one comma.

Answer 1

Hello,

Welcome to Microsoft Q&A!

I'm not sure about the input data that you mentioned. But I have made a solution about how to clean the second comma when user type something in the TextBox. We could handle the TextBox.TextChanged Event and check the input value when user input every character. Then if we find that there are two commas, remove the last comma.

Here is the code I use：

        private void MyTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            //remove the second comma
            TextBox textBox = sender as TextBox;

            string inputString = textBox.Text;
            int count = Regex.Matches(inputString, ",").Count;
            if (count > 1)
            {
                var lastIndex = inputString.LastIndexOf(",");
                inputString= inputString.Remove(lastIndex, 1);
            }
            textBox.Text = inputString;

            textBox.SelectionStart = textBox.Text.Length;
            textBox.SelectionLength = 0;

            var d = double.Parse(textBox.Text);
            Debug.WriteLine(d);
        }

Thank you.

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Answer 2

so are commas for 100, 1000, etc separator, or for whole and decimal?

if the former its just:

value = value.Replace(",","")

if the latter, how do you know which one is correct?