如何在 RichTextBox 中添加 RTF 文本，Win C#

How to Append RTF Text in RichTextBox, Win C#(如何在 RichTextBox 中添加 RTF 文本，Win C#)

问题描述

我在 Win C# 中有一个 RichTextBox，我想在 RichTextBox 中添加一些具有粗体效果的新文本.那么我该怎么做呢.

I have a RichTextBox in Win C#, and I want to append some new text with Bold effect in RichTextBox. So how can i do this.

我试过了

string str = richTextBox.Rtf;

//my logic
str+= @"
tf1ansi Adding Some  Text0.}";
//

现在追加

richTextbox.AppendText(str);

但它显示不正确.

我之前的输出

这是第一个字.

我想要像这样的输出

这是第一个字.添加一些文本.

那么我该怎么做呢?

推荐答案

以下函数采用对 RichTextBox 的引用以及一些格式参数.该功能已记录在案:

The following function takes a reference to a RichTextBox, along with some formatting parameters. The function is documented:

/// <summary>
/// Append formatted text to a Rich Text Box control 
/// </summary>
/// <param name="rtb">Rich Text Box to which horizontal bar is to be added</param>
/// <param name="text">Text to be appended to Rich Text Box</param>
/// <param name="textColour">Colour of text to be appended</param>
/// <param name="isBold">Flag indicating whether appended text is bold</param>
/// <param name="alignment">Horizontal alignment of appended text</param>
private void AppendFormattedText(RichTextBox rtb, string text, Color textColour, Boolean isBold, HorizontalAlignment alignment)
{
    int start = rtb.TextLength;
    rtb.AppendText(text);
    int end = rtb.TextLength; // now longer by length of appended text

    // Select text that was appended
    rtb.Select(start, end - start);

    #region Apply Formatting
    rtb.SelectionColor = textColour;
    rtb.SelectionAlignment = alignment;
    rtb.SelectionFont = new Font(
         rtb.SelectionFont.FontFamily,
         rtb.SelectionFont.Size,
         (isBold ? FontStyle.Bold : FontStyle.Regular));
    #endregion

    // Unselect text
    rtb.SelectionLength = 0;
}

以下代码添加原文:

这是第一个字.

// This creates the original text
AppendFormattedText(richTextBox, "This is ", Color.Black, false, HorizontalAlignment.Left);
AppendFormattedText(richTextBox, "First", Color.Black, true, HorizontalAlignment.Left);
AppendFormattedText(richTextBox, " Word.", Color.Black, false, HorizontalAlignment.Left);

...然后在末尾附加一个句子，使得富文本框的内容如愿:

... and then appends a sentence to the end, such that the content of the Rich Text Box is as desired:

这是第一个字.添加一些文本.

// This appends additional text
AppendFormattedText(richTextBox, " Adding Some ", Color.Black, false, HorizontalAlignment.Left);
AppendFormattedText(richTextBox, "Text", Color.Black, true, HorizontalAlignment.Left);
AppendFormattedText(richTextBox, ".", Color.Black, false, HorizontalAlignment.Left);

除了问题中要求的参数之外，还有其他参数(例如颜色)，但这些参数构成了可以使用 select-format-deselect 格式化方法完成的所有格式化操作的基础，而不是而不是手动编辑 RTF 代码.

There are additional parameters (such as colour) that are in addition to what was asked for in the question, but these form the basis of all formatting operations that can be done with the select-format-deselect approach to formatting, rather than manually editing the RTF codes.

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