How Can I Colorize Different Segments of Text within a RichTextBox?

In the Richtextbox, the text fragment is colorful

The text display in the RichTextBox control usually needs to use different colors to highlight the specific part. Consider such a scenario: You have a dynamic string, which contains different content. In this case, you may want to allocate different colors for the timestamp, username and message itself.

In order to achieve this coloring, a expansion method can be achieved to re -load the APPENDTEXT method of Richtextbox and add a color parameter:

Using this expansion method, you can color the various parts of the string shown below:

public static class RichTextBoxExtensions
{
    public static void AppendText(this RichTextBox box, string text, Color color)
    {
        box.SelectionStart = box.TextLength;
        box.SelectionLength = 0;
        box.SelectionColor = color;
        box.AppendText(text);
        box.SelectionColor = box.ForeColor; //重置颜色
    }
}

This technology provides precise control of the color coloring of Richtextbox content, which enhances its visual attractiveness and readability.

string userid = "USER0001";
string message = "访问被拒绝";
RichTextBox box = new RichTextBox
{
    Dock = DockStyle.Fill,
    Font = new Font("Courier New", 10)
};

box.AppendText("[" + DateTime.Now.ToShortTimeString() + "]", Color.Red);
box.AppendText(" ");
box.AppendText(userid, Color.Green);
box.AppendText(": ");
box.AppendText(message, Color.Blue);
box.AppendText(Environment.NewLine);

Form form = new Form { Controls = { box } };
form.ShowDialog();

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