ICSharpCode.TextEditor如何自定义代码折叠和高亮

　　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：

1 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.

2 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 = ; 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, , 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 > )
                    {
                        int start = startLines.Pop();
                        list.Add(new FoldMarker(document, start, document.GetLineSegment(start).Length, i, , 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 + ).Offset, document.GetLineSegment(start + ).Length);
                    //remove ///
                    display = display.Trim().TrimStart('/');
                    list.Add(new FoldMarker(document, start, document.GetLineSegment(start).Length, i, , FoldType.TypeBody, display));
                }
            }

            return list;
        }
    }
}

3 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",);
  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：