RichTextBox 粗体文本

Question

我正在用从文本框中收集的信息填充 richtextbox。我需要来自用户的输入在 Richtextbox 中变为粗体。我在 SO 中尝试了不同的答案，但是或者我做错了什么或者我找不到正确的答案。

我试过 RTF 和附加文本：

rtbGeneratedText.Text += @"In answer to your request regarding " + 
    rtbSpecialRequest.Text +
    " for your booking " +
    bookingNumberTxt.Text +
    " the hotel has informed us that unfortunately it is not possible." + "\r\n" + 
    "Please let us know if this negative answer will affect your reservation in any way.";

Answer 1

这里是如何加粗句子的一部分（几个字）：

string target = "the hotel has informed us that unfortunately it is not possible";
RichTextBox1.SelectionStart = RichTextBox1.Text.IndexOf(target);
RichTextBox1.SelectionLength = target.Length;
RichTextBox1.SelectionFont = new Font(RichTextBox1.Font, FontStyle.Bold);

或者如果你想加粗所有文本：

RichTextBox1.SelectionStart = 0;
RichTextBox1.SelectionLength = RichTextBox1.Length;
RichTextBox1.SelectionFont = new Font(RichTextBox1.Font, FontStyle.Bold);

RichTextBox 粗体文本

RichTextBox bold text

c#

richtextbox

windows-forms-designer