一个RichTextBox字符串的颜色不同部位 [英] Color different parts of a RichTextBox string

问题描述

我想为一个字符串的颜色部分追加到一个RichTextBox。我从不同的字符串建立一个字符串。

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;

这是该消息将是什么样子，一旦它的构造。

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

[下午9点23分]网友：我在这里的消息

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

我要在一切，包括括号[9:23]是一种颜色，用户是另一种颜色，是另一种颜色的消息。然后我想追加到我的RichTextBox的字符串。

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

下面是与颜色参数重载 AppendText通过方法的扩展方法：

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，如果你输了很多的消息，你可能会注意到一些闪烁。见<一href=\"http://www.c-sharpcorner.com/UploadFile/mgold/ColorSyntaxEditor12012005235814PM/ColorSyntaxEditor.aspx\">this C＃角的文章，就如何减少RichTextBox的闪烁的想法。

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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