How Can I Color-Code Text Segments Within a RichTextBox in C#?

In the text of the text of RichTextbox in C#, color colors

By coloring different parts of the string, it can enhance the function of RichTextbox and increase visual attractiveness and clarity. This problem is to achieve this goal by assigning the string into multiple segments and assigning it to each paragraph before it is attached to the Richtextbox.

The extension method used to enhance text additional

In order to promote this task, an expansion method called is introduced. It accepts an additional color parameter that allows developers to specify the color of the additional text. The following code shows the implementation of this method:

AppendText Actual application

<code class="language-csharp">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
    }
}</code>

In order to use this expansion function, developers can specify the required colors for each segment, and then attach paragraphs to Richtextbox. For example, if the required string is " User: My Message Here.", The color of the timestamp is red, the color of "user" is green, and the color of the message is blue, then the following code demonstrates the usage:

Solving the flashing problem [9:23pm]

<code class="language-csharp">var userid = "USER0001";
var message = "Access denied";
var 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);

new Form { Controls = { box } }.ShowDialog();</code>

As mentioned in the provided answer, the output of a large amount of messages may cause Richtextbox to flash. To reduce this situation, you can refer to the C# CORNER article discussed in the answer to understand the method of optimizing the performance of RichtextBox.

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