C#在RichTextBox中粗体化一部分字符串

Question

我试图加粗"You >>"这个字符串的一部分,以显示在富文本框中.

以下是我单击消息发送按钮时的代码.displayBox是字符串的粗体,entryBox是用户输入消息的位置.

        private void button1_Click(object sender, EventArgs e)
    {
        listData.Add(entryBox.Text);
        // Remove the linebreak caused by pressing return
        SendKeys.Send("\b");


        // Empty the array string
        ArrayData = "";

        // Bold the You >>
        displayBox.SelectionStart = 0;
        displayBox.SelectionLength = 6;
        displayBox.SelectionFont = new Font(displayBox.Font, FontStyle.Bold);
        displayBox.SelectionLength = 0;

        foreach (string textItem in listData)
        {
            ArrayData = ArrayData + "You >> " + textItem + "\r\n";
        }
        entryBox.Focus();
        displayBox.Text = "";
        displayBox.Refresh();
        displayBox.Text = ArrayData;
        entryBox.Text = "";

    }

任何帮助都会很棒.

Answer 1

在评论中@ dash的链接帮助解决了这个问题.链接:http://msmvps.com/blogs/deborahk/archive/2009/10/31/richtextbox-styles.aspx

这是我的代码,它现在代表相同的按钮(虽然我已经重命名了).这可能不是解决这个问题的最干净的解决方案,但是我达到了预期的效果,所以我很满意.评论中对此进行了解释.

        private void send_Click(object sender, EventArgs e)
    {
        if (entryBox.Text != "")
        {
            listData.Add(entryBox.Text);
            // Remove the linebreak caused by pressing return
            SendKeys.Send("\b");

            // Empty the array string
            ArrayData = "";

            foreach (string textItem in listData)
            {
                ArrayData = ArrayData + "You >> " + textItem + "\r\n";
            }
            entryBox.Focus();
            displayBox.Text = "";
            displayBox.Refresh();
            displayBox.Text = ArrayData;

            // Format the "You >>"
            displayBox.SelectionStart = 0;
            displayBox.SelectionLength = 6;
            displayBox.SelectionFont = new Font(displayBox.Font, FontStyle.Bold);
            displayBox.SelectionColor = Color.Crimson;
            displayBox.SelectionLength = 0;
            string wordToFind = "You >>";
            int startIndex = 0;
            while (startIndex > -1)
            {
                startIndex = displayBox.Find(wordToFind, startIndex + 1,
                                displayBox.Text.Length,
                                RichTextBoxFinds.WholeWord);
                if (startIndex > -1)
                {
                    displayBox.Select(startIndex, wordToFind.Length);
                    displayBox.SelectionFont = new Font(displayBox.Font, FontStyle.Bold);
                    displayBox.SelectionColor = Color.Crimson;
                }
            }
            // Reset the entry box to empty
            entryBox.Text = "";

        }
        // Remove the linebreak caused by pressing return
        SendKeys.Send("\b");
    }

我希望这能为任何有类似问题的人提供一些帮助!

:丹