RichTextBox C# 以编程方式触发某些功能 [英] RichTextBox C# programmatically trigger certain functions

问题描述

我想在 RichTextBox 编辑器中以编程方式触发以下函数.

I want to trigger the following functions programmatically in my RichTextBox Editor.

我已经有了:

//Copy   
TextRange range = new TextRange(doc.Editor.Selection.Start, doc.Editor.Selection.End);
                Clipboard.SetText(range.Text);
    //Paste  
     Editor.Paste();
   // PageDown 
     Editor.PageDown();
   // PageUp     
     Editor.PageUp();
    //Text Size 
     Editor.FontSize = number;
    //Undo    
     Editor.Undo();
    //Redo    
     Editor.Redo();

我想将以下内容应用到 RichTextBox 上当前选定的文本:

I want to apply the following to the currently selected text on a RichTextBox:

左对齐
右对齐
中心
增加/减少行距
粗体
下划线
斜体

AlignLeft
AlignRight
Center
Increase/Decrease line spacing
Bold
Underline
Italic

推荐答案

事实证明，有两种方法可以设置 RichTextBox 的文本样式.

As it turns out, there are two ways to set a RichTextBox's text styles.

其中之一是通过更改控件段落的样式.这仅适用于段落 - 不适用于选择.

One of them is by changing styles of the control's paragraphs. This only works on paragraphs - not selections.

您可以通过 RichTextBox 的 .Document.Blocks 属性获得可以转换为段落的块集​​合.这是对第一段应用一些样式的代码示例.

You get at a collection of blocks, which can be casted to paragraphs, through the .Document.Blocks property of the RichTextBox. Here's a code sample that applies some styling to the first paragraph.

Paragraph firstParagraph = Editor.Document.Blocks.FirstBlock as Paragraph;
firstParagraph.TextAlignment = TextAlignment.Right;
firstParagraph.TextAlignment = TextAlignment.Left;
firstParagraph.FontWeight = FontWeights.Bold;
firstParagraph.FontStyle = FontStyles.Italic;
firstParagraph.TextDecorations = TextDecorations.Underline;
firstParagraph.TextIndent = 10;
firstParagraph.LineHeight = 20;

如果可能，这是应用样式的首选方式.尽管它确实需要您编写更多代码，但它提供了编译时类型检查.

When possible, this is the preferred way of applying styles. Although it does require you to write more code, it provides compile-time type checking.

另一个是应用它们到文本范围

这允许您将样式应用于选择，但不会进行类型检查.

The other, would be to apply them to a text range

This permits you to apply styles to a selection, but is not type-checked.

TextRange selectionRange = Editor.Selection as TextRange;
selectionRange.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);
selectionRange.ApplyPropertyValue(TextElement.FontStyleProperty, FontStyles.Italic);
selectionRange.ApplyPropertyValue(Inline.TextDecorationsProperty, TextDecorations.Underline);
selectionRange.ApplyPropertyValue(Paragraph.LineHeightProperty, 45.0);
selectionRange.ApplyPropertyValue(Paragraph.TextAlignmentProperty, TextAlignment.Right);

请务必始终将正确的类型传递给 ApplyPropertyValue 函数，因为它不支持编译时类型检查.

例如，如果 LineHeightProperty 设置为 45，这是一个 Int32，而不是预期的 Double，您将得到一个运行时ArgumentException.

For instance, if the LineHeightProperty were set to 45, which is an Int32, instead of the expected Double, you will get a run-time ArgumentException.

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