c# - 更改 RichTextBox 中选定文本的样式

Question

如何更改选定文本的样式（例如字体、字体大小、画笔）RichTextBox？

更新：假设我有一个RichTextBox和一个工具栏。用户来并在 RichTextBox 框中选择文本并从工具栏更改字体大小。我想更改所选文本的样式。

Answer 1

WPF

if (this.TextEditor.Selection.IsEmpty)
    this.TextEditor.CurrentFontFamily = SelectedFont;
else
    this.TextEditor.Selection.ApplyPropertyValue(TextElement.FontFamilyProperty, SelectedFont);

或另一个 WPF 示例

 private void ChangeTextProperty(DependencyProperty dp, string value)
    {
        if (mainRTB == null) return;

        TextSelection ts = richTextBox.Selection;
        if (ts!=null)
            ts.ApplyPropertyValue(dp, value);
        richTextBox.Focus();
    }

这是一些示例 Windows 更改字体和字体颜色（不是 wpf）

richTextBox1.SelectionFont = new Font("Tahoma", 12, FontStyle.Bold);
richTextBox1.SelectionColor = System.Drawing.Color.Red;

下面的另一个例子（不是wpf）

private void WriteTextToRichTextBox()
{
   // Clear all text from the RichTextBox;
   richTextBox1.Clear();
   // Set the font for the opening text to a larger Arial font;
   richTextBox1.SelectionFont = new Font("Arial", 16);
   // Assign the introduction text to the RichTextBox control.
   richTextBox1.SelectedText = "The following is a list of bulleted items:" + "\n";
   // Set the Font for the first item to a smaller size Arial font.
   richTextBox1.SelectionFont = new Font("Arial", 12);
   // Specify that the following items are to be added to a bulleted list.
   richTextBox1.SelectionBullet = true;
   // Set the color of the item text.
   richTextBox1.SelectionColor = Color.Red;
   // Assign the text to the bulleted item.
   richTextBox1.SelectedText = "Apples" + "\n";
   // Apply same font since font settings do not carry to next line.
   richTextBox1.SelectionFont = new Font("Arial", 12);
   richTextBox1.SelectionColor = Color.Orange;
   richTextBox1.SelectedText = "Oranges" + "\n";
   richTextBox1.SelectionFont = new Font("Arial", 12);
   richTextBox1.SelectionColor = Color.Purple;
   richTextBox1.SelectedText = "Grapes" + "\n";
   // End the bulleted list.
   richTextBox1.SelectionBullet = false;
   // Specify the font size and string for text displayed below bulleted list.
   richTextBox1.SelectionFont = new Font("Arial", 16);
   richTextBox1.SelectedText = "Bulleted Text Complete!";
}

Answer 2

对于 WPF RichTextBox，您必须对 TextRange 使用 ApplyPropertyValue 方法。您可以使用 RichTextBox 实例的 Selected 属性获取选定的 TextRange。

var selection = myRichTextBox.Selection;
if (!selection.IsEmpty)
    selection.ApplyPropertyValue(TextElement.FontSizeProperty, 10.0);