如何将一个角色更改为另一个角色

Question

I Wanna Know how to change a Character that user type in an usual Textbox into another Character

for Example:

if user type " A " in the Textbox , I wanna the programme to type " B "

and if user type " N " in the Textbox , I wanna the programme to type " M "

and if user type " Y " in the Textbox , I wanna the programme to type " S "

And so..

so when user type " ANY " i need the text in the textbox to be " BMS "

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i have solved the problem from Custom TextBox Control that Switches Keyboard Language Automatically c# WPF

Answer 1

You need to implement the textbox's OnTextChanged / TextChanged event (which depends on whether you are doing win forms or .net).

You can access the current value of the text box using the textbox's Text value.

You will need to save the old value to compare against so you can keep track of which characters you have already changed.

Answer 2

If you are using Visual Studio, make a textbox and double click on it. Then a method shows up, and you insert the following code:

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        if (textBox1.Text == "ANY")
            textBox1.Text = "BMS";
    }

The method checks if your textbox contains the string "ANY" and changes it to "BMS". You can also alter this method so it changes the letters for every single letter you write. For instance:

A -> B
BN -> BM
BMY -> BMS

This will give the feeling that the word changes while it is being written instead of when the entire word has been written.

Answer 3

First create a dictionary that contains information about what to change with what like this

Dictionary<string, string> myDict = new Dictionary<string, string>
{
    {"A", "B"},
    {"N", "M"},
    {"Y", "S"},            
};

You can simply do that by overriding the OnTextInput method in your own custom class. So your complete code for your own custom class will be

namespace WpfApplication
{
    public class MyTextBox : TextBox
    {
        Dictionary<string, string> myDict = new Dictionary<string, string>
        {
            {"A", "B"},
            {"N", "M"},
            {"Y", "S"},            
        };

        protected override void OnTextInput(TextCompositionEventArgs e)
        {
            string str;
            if (myDict.TryGetValue(e.Text, out str))
            {
                e.Handled = true;
                if (SelectionLength == 0)
                    Text = Text.Insert(CaretIndex, str)
                else
                {
                    SelectedText = str;
                    SelectionLength = 0;
                }

                CaretIndex += Text.Length;
            }

            base.OnTextInput(e);
        }
    }
}

Answer 4

Try this. It may solve your problem.

private void textBox1_TextChanged(object sender, EventArgs e)
    {
        string finalValue;
        if (!String.IsNullOrEmpty(textBox1.Text))
        {

            byte[] ascii = Encoding.ASCII.GetBytes(textBox1.Text);

            List<byte> newB = new List<byte>();
            foreach (byte b in ascii)
            {
                byte s = b;
                s++;
                newB.Add(s);
            }

            finalValue = Encoding.ASCII.GetString(newB.ToArray());
        }
    }