为 RichTextBox 字符串的不同部分着色 [英] Color different parts of a RichTextBox string

问题描述

我正在尝试为要附加到 RichTextBox 的字符串部分着色.我有一个由不同字符串构建的字符串.

I'm trying to color parts of a string to be appended to a RichTextBox. I have a string built from different strings.

string temp = "[" + DateTime.Now.ToShortTimeString() + "] " +
              userid + " " + message + Environment.NewLine;

这是消息构建后的样子.

This is what the message would look like once it is constructed.

[9:23pm] 用户:我的消息在这里.

[9:23pm] User: my message here.

我希望括号 [9:23] 内和包括括号内的所有内容都为一种颜色，用户"为另一种颜色，而消息为另一种颜色.然后我想将字符串附加到我的 RichTextBox.

I want everything within and including the brackets [9:23] to be one color, 'user' to be another color and the message to be another color. Then I'd like the string appended to my RichTextBox.

我怎样才能做到这一点?

How can I accomplish this?

推荐答案

这里有一个扩展方法，它使用颜色参数重载 AppendText 方法:

Here is an extension method that overloads the AppendText method with a color parameter:

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;
    }
}

这就是你将如何使用它:

And this is how you would use it:

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();

请注意，如果您输出大量消息，您可能会注意到一些闪烁.有关如何减少 RichTextBox 闪烁的想法，请参阅这篇 C# Corner 文章.

Note that you may notice some flickering if you're outputting a lot of messages. See this C# Corner article for ideas on how to reduce RichTextBox flicker.

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