RichTextBox.CaretPosition 属性
定义
重要
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获取或设置输入插入符号的位置。
public:
property System::Windows::Documents::TextPointer ^ CaretPosition { System::Windows::Documents::TextPointer ^ get(); void set(System::Windows::Documents::TextPointer ^ value); };public System.Windows.Documents.TextPointer CaretPosition { get; set; }member this.CaretPosition : System.Windows.Documents.TextPointer with get, setPublic Property CaretPosition As TextPointer属性值
一个指定输入插入符号的位置的 TextPointer 对象。
默认情况下，插入符号位于 RichTextBox 承载的内容开头的第一个插入位置。 有关文本位置术语（如“插入位置”）的更多信息，请参见 TextPointer。
例外
尝试将该属性设置为 null。
尝试将此属性设置为引用当前文档外部位置的 TextPointer。
示例
以下示例演示了此属性的用法。
// Create a new FlowDocument, and add 3 paragraphs.
FlowDocument flowDoc = new FlowDocument();
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 1")));
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 2")));
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 3")));
// Set the FlowDocument to be the content for a new RichTextBox.
RichTextBox rtb = new RichTextBox(flowDoc);
// Get the current caret position.
TextPointer caretPos = rtb.CaretPosition;
// Set the TextPointer to the end of the current document.
caretPos = caretPos.DocumentEnd;
// Specify the new caret position at the end of the current document.
rtb.CaretPosition = caretPos;
' Create a new FlowDocument, and add 3 paragraphs.
Dim flowDoc As New FlowDocument()
flowDoc.Blocks.Add(New Paragraph(New Run("Paragraph 1")))
flowDoc.Blocks.Add(New Paragraph(New Run("Paragraph 2")))
flowDoc.Blocks.Add(New Paragraph(New Run("Paragraph 3")))
' Set the FlowDocument to be the content for a new RichTextBox.
Dim rtb As New RichTextBox(flowDoc)
' Get the current caret position.
Dim caretPos As TextPointer = rtb.CaretPosition
' Set the TextPointer to the end of the current document.
caretPos = caretPos.DocumentEnd
' Specify the new caret position at the end of the current document.
rtb.CaretPosition = caretPos
