.NET中用ICSharpCode.TextEditor自定义折叠与高亮

前言

ICSharpCode.TextEditor 是一款非常不错的.NET代码编辑控件，内置了多种高亮语言支持，同时完美支持中文，非常赞！

先来看一下运行效果：

一、项目结构

这里需要注意lib文件夹下导入的类库，这个Demo需要这些dll.

二、代码折叠

需要实现IFoldingStrategy中的 GenerateFoldMarkers 方法，代码如下：

using ICSharpCode.TextEditor.Document;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace JackWangCUMT.WinForm
{
 
 /// <summary>
 /// The class to generate the foldings, it implements ICSharpCode.TextEditor.Document.IFoldingStrategy
 /// </summary>
 public class MingFolding : IFoldingStrategy
 {
  /// <summary>
  /// Generates the foldings for our document.
  /// </summary>
  /// <param name="document">The current document.</param>
  /// <param name="fileName">The filename of the document.</param>
  /// <param name="parseInformation">Extra parse information, not used in this sample.</param>
  /// <returns>A list of FoldMarkers.</returns>
  public List<FoldMarker> GenerateFoldMarkers(IDocument document, string fileName, object parseInformation)
  {
   List<FoldMarker> list = new List<FoldMarker>();
   //stack 先进先出
   var startLines = new Stack<int>();
   // Create foldmarkers for the whole document, enumerate through every line.
   for (int i = 0; i < document.TotalNumberOfLines; i++)
   {
    // Get the text of current line.
    string text = document.GetText(document.GetLineSegment(i));

    if (text.Trim().StartsWith("#region")) // Look for method starts
    {
     startLines.Push(i);

    }
    if (text.Trim().StartsWith("#endregion")) // Look for method endings
    {
     int start = startLines.Pop();
     // Add a new FoldMarker to the list.
     // document = the current document
     // start = the start line for the FoldMarker
     // document.GetLineSegment(start).Length = the ending of the current line = the start column of our foldmarker.
     // i = The current line = end line of the FoldMarker.
     // 7 = The end column
     list.Add(new FoldMarker(document, start, document.GetLineSegment(start).Length, i, 57, FoldType.Region, "..."));
    }
    //支持嵌套 {}
    if (text.Trim().StartsWith("{")) // Look for method starts
    {
     startLines.Push(i);
    }
    if (text.Trim().StartsWith("}")) // Look for method endings
    {
     if (startLines.Count > 0)
     {
      int start = startLines.Pop();
      list.Add(new FoldMarker(document, start, document.GetLineSegment(start).Length, i, 57, FoldType.TypeBody, "...}"));
     }
    }


    // /// <summary>
    if (text.Trim().StartsWith("/// <summary>")) // Look for method starts
    {
     startLines.Push(i);
    }
    if (text.Trim().StartsWith("/// <returns>")) // Look for method endings
    {

     int start = startLines.Pop();
     //获取注释文本（包括空格）
     string display = document.GetText(document.GetLineSegment(start + 1).Offset, document.GetLineSegment(start + 1).Length);
     //remove ///
     display = display.Trim().TrimStart('/');
     list.Add(new FoldMarker(document, start, document.GetLineSegment(start).Length, i, 57, FoldType.TypeBody, display));
    }
   }

   return list;
  }
 }
}

三、高亮配置

拷贝CSharp-Mode.xshd为 JackCSharp-Mode.xshd ，将其中的名字修改为： SyntaxDefinition name = "JackC#" ，并添加高亮关键字，如下：

这样代码中出现的JackWang就会高亮。下面的代码片段将自定义高亮文件进行加载，并用SetHighlighting进行设置，这里一定注意目录下必须有xshd的配置文件，否则高亮将失效。

textEditor.Encoding = System.Text.Encoding.UTF8;
 textEditor.Font = new Font("Hack",12);
 textEditor.Document.FoldingManager.FoldingStrategy = new JackWangCUMT.WinForm.MingFolding();
 textEditor.Text = sampleCode;

 //自定义代码高亮
 string path = Application.StartupPath+ "\\HighLighting";
 FileSyntaxModeProvider fsmp;
 if (Directory.Exists(path))
 {
  fsmp = new FileSyntaxModeProvider(path);
  HighlightingManager.Manager.AddSyntaxModeFileProvider(fsmp);
  textEditor.SetHighlighting("JackC#");
    

 }

为了保持代码适时进行折叠，这里监听文本变化，如下所示：

   private void TextEditor_TextChanged(object sender, EventArgs e)
   {
    //更新，以便进行代码折叠
    textEditor.Document.FoldingManager.UpdateFoldings(null, null);
   }

最后说明的是，我们可以定义一个格式化代码的类，来格式化C#代码：

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