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使用 TextFormatter 时，我在 MSDN 上看到了这篇文章，其中显示了以下示例代码：

// Create a TextFormatter object.
TextFormatter formatter = TextFormatter.Create();

// Create common paragraph property settings.
CustomTextParagraphProperties customTextParagraphProperties
    = new CustomTextParagraphProperties();

// Format each line of text from the text store and draw it.
while (textStorePosition < customTextSource.Text.Length)
{
    // Create a textline from the text store using the TextFormatter object.
    using (TextLine myTextLine = formatter.FormatLine(
        customTextSource,
        textStorePosition,
        96 * 6,
        customTextParagraphProperties,
        null))
    {
        // Draw the formatted text into the drawing context.
        myTextLine.Draw(drawingContext, linePosition, InvertAxes.None);

        // Update the index position in the text store.
        textStorePosition += myTextLine.Length;

        // Update the line position coordinate for the displayed line.
        linePosition.Y += myTextLine.Height;
    }
}

我遇到的问题是即使在引用之后System.Windows.Media.TextFormatting也没有使用类/对象，CustomTextParagraphProperties因此该行会引发错误（当然，因为它不存在）

我还需要参考什么来访问这个类？

这是我的using清单：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Drawing.Printing;
using System.ComponentModel;
using System.Windows.Media.TextFormatting;
using System.IO;

这是我的参考文献列表：

参考

我发现TextParagraphProperties但这是一个abstract类，因此无法使用 创建new，这意味着它不是替代品，CustomTextParagraphProperties如示例所示，以下行不起作用：

TextParagraphProperties tp = new TextParagraphProperties();

注意：我添加了 WPF 标记，因为该项目继承了 WPF 功能，但这不是 WPF 项目。

我开始钻了一个兔子洞，发现越来越多abstract的父类依赖的共同依赖类，并且由于不能使用new初始化对象，必须编写一堆代码，看不到尽头，这很令人沮丧：

#region textformatter
    class TextRunProperties : System.Windows.Media.TextFormatting.TextRunProperties {
        public override Windows.Media.Brush BackgroundBrush { get; set; }
        public override Windows.BaselineAlignment BaselineAlignment { get { return base.BaselineAlignment; } }
        public override CultureInfo CultureInfo { get; set; }
        public override double FontHintingEmSize { get; set; }
        public override double FontRenderingEmSize { get; set; }
        public override Windows.Media.Brush ForegroundBrush { get; set; }
        public override Windows.Media.NumberSubstitution NumberSubstitution { get { return base.NumberSubstitution; } }
        public override TextDecorationCollection TextDecorations { get; set; }
        public override Windows.Media.TextEffectCollection TextEffects { get; set; }
        public override Windows.Media.Typeface Typeface { get; set; }
        public override Windows.Media.TextFormatting.TextRunTypographyProperties TypographyProperties { get { return base.TypographyProperties; } }
    }

    class TextRun : System.Windows.Media.TextFormatting.TextRun {
        public override CharacterBufferReference CharacterBufferReference { get; set; }
        public override int Length { get; set; }
        public override Windows.Media.TextFormatting.TextRunProperties Properties { get; set; }
    }

    class TextSource : System.Windows.Media.TextFormatting.TextSource {
        public override Windows.Media.TextFormatting.TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText( int textSourceCharacterIndexLimit ) {
            return new TextSpan<CultureSpecificCharacterBufferRange>(
                textSourceCharacterIndexLimit,
                new CultureSpecificCharacterBufferRange(
                    new CultureInfo(0),
                    Windows.Media.TextFormatting.CharacterBufferRange.Empty
                )
            );
        }

        public override int GetTextEffectCharacterIndexFromTextSourceCharacterIndex( int textSourceCharacterIndex ) {
            return 0;
        }

        public override Windows.Media.TextFormatting.TextRun GetTextRun( int textSourceCharacterIndex ) {
            return new TextRun();
        }
    }

    class TextFormatter : System.Windows.Media.TextFormatting.TextFormatter {
        public override Windows.Media.TextFormatting.TextLine FormatLine( Windows.Media.TextFormatting.TextSource textSource, int firstCharIndex, double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak, TextRunCache textRunCache ) {
            throw new NotImplementedException();
        }

        public override Windows.Media.TextFormatting.TextLine FormatLine( Windows.Media.TextFormatting.TextSource textSource, int firstCharIndex, double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak ) {
            throw new NotImplementedException();
        }

        public override Windows.Media.TextFormatting.MinMaxParagraphWidth FormatMinMaxParagraphWidth( Windows.Media.TextFormatting.TextSource textSource, int firstCharIndex, TextParagraphProperties paragraphProperties ) {
            throw new NotImplementedException();
        }

        public override Windows.Media.TextFormatting.MinMaxParagraphWidth FormatMinMaxParagraphWidth( Windows.Media.TextFormatting.TextSource textSource, int firstCharIndex, TextParagraphProperties paragraphProperties, TextRunCache textRunCache ) {
            throw new NotImplementedException();
        }

    }

    class TextLine : System.Windows.Media.TextFormatting.TextLine {
        public override double Baseline {
            get { throw new NotImplementedException(); }
        }

        public override int DependentLength {
            get { throw new NotImplementedException(); }
        }

        public override double Extent {
            get { throw new NotImplementedException(); }
        }
        public override bool HasCollapsed {
            get { throw new NotImplementedException(); }
        }
        public override bool HasOverflowed {
            get { throw new NotImplementedException(); }
        }

        public override double Height {
            get { throw new NotImplementedException(); }
        }

        public override bool IsTruncated {
            get {
                return base.IsTruncated;
            }
        }

        public override int Length {
            get { throw new NotImplementedException(); }
        }

        public override double MarkerBaseline {
            get { throw new NotImplementedException(); }
        }
        public override double MarkerHeight {
            get { throw new NotImplementedException(); }
        }
        public override int NewlineLength {
            get { throw new NotImplementedException(); }
        }
        public override double OverhangAfter {
            get { throw new NotImplementedException(); }
        }
        public override double OverhangLeading {
            get { throw new NotImplementedException(); }
        }
        public override double OverhangTrailing {
            get { throw new NotImplementedException(); }
        }
        public override double Start {
            get { throw new NotImplementedException(); }
        }
        public override double TextBaseline {
            get { throw new NotImplementedException(); }
        }
        public override double TextHeight {
            get { throw new NotImplementedException(); }
        }
        public override int TrailingWhitespaceLength {
            get { throw new NotImplementedException(); }
        }
        public override double Width {
            get { throw new NotImplementedException(); }
        }
        public override double WidthIncludingTrailingWhitespace {
            get { throw new NotImplementedException(); }
        }

        // functions
        public override Windows.Media.TextFormatting.TextLine Collapse( params TextCollapsingProperties[] collapsingPropertiesList ) {
            throw new NotImplementedException();
        }
        public override void Draw( DrawingContext drawingContext, Windows.Point origin, InvertAxes inversion ) {
            throw new NotImplementedException();
        }
        public override CharacterHit GetBackspaceCaretCharacterHit( CharacterHit characterHit ) {
            throw new NotImplementedException();
        }

        public override CharacterHit GetCharacterHitFromDistance( double distance ) {
            throw new NotImplementedException();
        }
        public override double GetDistanceFromCharacterHit( CharacterHit characterHit ) {
            throw new NotImplementedException();
        }
        public override IEnumerable<IndexedGlyphRun> GetIndexedGlyphRuns() {
            throw new NotImplementedException();
        }
        public override CharacterHit GetNextCaretCharacterHit( CharacterHit characterHit ) {
            throw new NotImplementedException();
        }
        public override CharacterHit GetPreviousCaretCharacterHit( CharacterHit characterHit ) {
            throw new NotImplementedException();
        }
        public override IList<TextBounds> GetTextBounds( int firstTextSourceCharacterIndex, int textLength ) {
            throw new NotImplementedException();
        }
        public override IList<TextCollapsedRange> GetTextCollapsedRanges() {
            throw new NotImplementedException();
        }
        public override TextLineBreak GetTextLineBreak() {
            throw new NotImplementedException();
        }
        public override IList<TextSpan<Windows.Media.TextFormatting.TextRun>> GetTextRunSpans() {
            throw new NotImplementedException();
        }
    }

#endregion

我什至不知道这是否正确，但从看来，这些must override方法都没有返回任何东西，那么这个类究竟做了什么？它是否会处理任何代码（例如获取 TextEffect），或者这一切都是必须手写的——也就是说，我必须编写自己的 TextEffects 并将它们作为具有更多方法的任何抽象结构填充到该代码中没做什么 ....

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1 回答 1

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您必须根据您的要求派生自己的类TextParagraphProperties并覆盖属性

public class CustomTextParagraphProperties  : TextParagraphProperties{...}

您还必须导出TextRunProperties并TextMarkerProperties返回您自己的值。

public class CustomTextRunProperties : TextRunProperties{...}
public class CustomTextMarkerProperties : TextMarkerProperties{...}
于 2016-04-07T05:44:59.380 回答