如何使上的RichTextBox串的特定部分粗体？ [英] How to make a specific part of string Bold on richTextBox?

问题描述

我有一个基于表单和2 richTextBoxes在聊天应用程序！

I have a chat application that is based on a Form and 2 richTextBoxes !

richTextBox1 用于显示所有的谈话
richTextBox_TextToSend 用于输入要发送的消息

richTextBox1 is used to display all conversation
richTextBox_TextToSend is used to type in the message to send

当用户键入消息，并按下回车键，将出现在richTextBox1输入文字

when a user types a message and hit the enter button, the entered text will appear in richTextBox1

private void button1_Click(object sender, EventArgs e)
    {
        // insert message to database
        if(richTextBox_TextToSend.TextLength>0) {

        string txt = richTextBox_TextToSend.Text;

        // send the typed message
        sendMessage(from,to,task_id,txt);

        // show the typed text in the richTextBox1
        richTextBox1.Text += from+": "+richTextBox_TextToSend.Text+"\n";
        richTextBox_TextToSend.Clear();



        }
    }

变量从 string类型持有谁发送邮件（使用应用程序的用户）的名称

The variable from of type string holds the name of who send the message (the user using the application)

如何只有在正常的字体样式加粗和其他文本显示的名称，以便在输入信息后，我看到

沙基卜优素菲：您好....

代替

沙基卜优素菲：你好...

How to display the name only in bold and other text in normal font style so after typing the message, I see

Chakib Yousfi : Hello....

instead of

Chakib Yousfi : Hello...

任何帮助将是非常美联社preciated。

Any help would be highly appreciated .

推荐答案

首先，你应该选择要大胆的文字：

First, you should select the text you want to make bold:

richTextBox1.SelectionStart = 0;
richTextBox1.SelectionLength = 13;

然后你就可以定义样式选定的文本：

And then you can define the style for the selected text:

richTextBox1.SelectionFont = new Font(richTextBox1.Font, FontStyle.Bold);

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