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| using System;
using System.Drawing;
using System.Windows.Forms;
namespace test
{
class MainClass
{
public static void Main (string[] args)
{
Win window = new Win();
window.Show();
Application.Run();
}
}
public class Win : Form
{
RichTextBox box;
TextBox textbox;
public Win ()
{
box = new RichTextBox();
this.Controls.Add(box);
textbox = new TextBox();
textbox.KeyUp+= delegate(object sender, KeyEventArgs e) {
box.HighlightText(textbox.Text,Color.Magenta);
};
this.Controls.Add(textbox);
textbox.Location = new Point(150,150);
this.Closed+= delegate {
Application.Exit();
};
}
}
public static class RichTextBoxExtensions
{
public static void HighlightText(this RichTextBox richTextBox, string word, Color color)
{
int startIndex = 0, index;
richTextBox.Select(0,richTextBox.Text.Length);
richTextBox.SelectionColor = richTextBox.ForeColor;
if(word.Length==0)return;
while((index = richTextBox.Text.IndexOf(word, startIndex)) != -1)
{
richTextBox.Select(index, word.Length);
richTextBox.SelectionColor = color;
startIndex = index + word.Length;
}
}
}
} |
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