解决方法
public class AutoCompleteTextBox : TextBox { public Point GetPositionFromCharacterIndex(int index) { if (textwrapping == textwrapping.Wrap) throw new NotSupportedException(); var text = Text.Substring(0,index); int lastNewLineIndex = text.LastIndexOf('\r'); var leftText = lastNewLineIndex != -1 ? text.Substring(lastNewLineIndex + 1) : text; var block = new TextBlock { FontFamily = FontFamily,FontSize = FontSize,FontStretch = FontStretch,FontStyle = FontStyle,FontWeight = FontWeight }; block.Text = text; double y = block.ActualHeight; block.Text = leftText; double x = block.ActualWidth; var scrollViewer = GetTemplateChild("ContentElement") as ScrollViewer; var point = scrollViewer != null ? new Point(x - scrollViewer.HorizontalOffset,y - scrollViewer.VerticalOffset) : new Point(x,y); point.X += BorderThickness.Left + Padding.Left; point.Y += BorderThickness.Top + Padding.Top; return point; } }
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