CODEWITHSUNDEEP
c#winformsrichtextbox
jeff
jeff

Reputation: 684

Winform RichTextBox get last character entered using c#

I am using the following code to extract the last character( the character just typed) using the following code

 private string GetTypedChar()
    {
        string currentChar = "";
        int i = rtfText.SelectionStart; 
        if (i > 0)
        {
            currentChar = rtfText.Text.Substring(i-1, 1);
            MessageBox.Show(i+":"+currentChar);
        }
        return currentChar;
    }

But this is giving me wrong results. If the word entered is "RS" the after pressing R the message box shows 1: (blank) then on typing S message box shows 2:R How to achieve this?

Upvotes: 0

Views: 3469

Answers (3)

Grant Winney
Grant Winney

Reputation: 66439

You could just eliminate GetTypedChar() altogether and subscribe to the KeyPress event.

Note that this won't give you the position of the character though, if you need that information.

private void richTextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    MessageBox.Show(string.Format("Last char typed: {0}", e.KeyChar));
}

Upvotes: 1

Jan
Jan

Reputation: 2168

The important question is when you execute that code. Sounds like you subscribe to the 'KeyDown' event. By the time this event is raised, the key stroke has not yet been processed by the form --> So you don't see the change. You could use the KeyUp event. When this gets fired, your control has a changed context.

This will, however, not help you, if the new character is not the last one. The user could change the courser position and type a character. Then the new character is somewhere in the middle of the text. This can be solved by actually checking which key has been pressed. This information is in the KeyEventArgs parameter.

Upvotes: 2

Ehsan
Ehsan

Reputation: 32681

to get the last entered character. You can handle the keyup event

private void richTextBox1_KeyUp(object sender, KeyEventArgs e)
    {
        char last = (char)e.KeyValue;
    }

you can get the last character of your rich text box

string lastCharacter = rtfText.Text.SubString(rtfText.Text.Length - 1,1);

or

char last = rtfText.Text[rtfText.Text.Length - 1];

or

Upvotes: 3

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