如何为 visual studio 编写自己的自动完成扩展？ （罗斯林/智能感知）

Question

我正在尝试使用自定义自动完成功能为 VS (2022) 编写扩展，但我遇到了一些问题。我想做两件事：

1. 如果我们有以 @ //@ -> @fruits: 开头的评论（并触发到第 2 步）
2. 如果我们有评论 //@fruits: -> @fruits:apple/cherry/banana 我尝试了不同的变体，但它不起作用。什么都没发生

来源：

using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis.Completion;
using System.Composition;
using Microsoft.IO;

namespace Fruits_VS
{
    [ExportCompletionProvider(nameof(ColorCompletionProvider), LanguageNames.CSharp)]
    [Shared]
    internal sealed class ColorCompletionProvider : CompletionProvider
    {
        public override async Task ProvideCompletionsAsync(CompletionContext context)
        {
            var document = context.Document;
            var position = context.Position;
            var cancellationToken = context.CancellationToken;

            var syntaxRoot = await document.GetSyntaxRootAsync(cancellationToken);
            var token = syntaxRoot.FindToken(position);
            var triviaList = token.LeadingTrivia;

            string currentLine = await GetCurrentLineTextAsync(context);
            int indexOfAt = currentLine.LastIndexOf('@');
            int indexOfColon = currentLine.LastIndexOf(':');

                       if (indexOfAt >= 0 && indexOfColon < 0)
            {
                context.AddItem(CompletionItem.Create("@fruits:"));
            }
            else if (indexOfAt >= 0 && indexOfColon > indexOfAt)
            {
                foreach (var trivia in triviaList)
                {
                    if (!trivia.ToString().Contains("@fruits:")) continue;

                    var colors = new[] { "apple", "cherry", "banana" };
                    foreach (var fruit in fruits)
                    {
                        context.AddItem(CompletionItem.Create(fruit));
                    }
                    break;
                }
            }
        }

        private async Task<string> GetCurrentLineTextAsync(CompletionContext context)
        {
            var text = await context.Document.GetTextAsync();
            var position = context.Position;
            var line = text.Lines.GetLineFromPosition(position);
            return text.ToString(line.Span);
        }

    public override bool ShouldTriggerCompletion(SourceText text, int caretPosition, CompletionTrigger trigger, OptionSet options)
    {
      if (trigger.Kind == CompletionTriggerKind.Invoke)
      {
          return true;
      }

      if (trigger.Kind == CompletionTriggerKind.Insertion && caretPosition > 0)
      {
        var currentCharacter = text[caretPosition - 1];
        var previousCharacter = caretPosition > 1 ? text[caretPosition - 2] : '\0';
      //here i tried all possible combination to trigger :(
        return (currentCharacter == '@' && char.IsWhiteSpace(previousCharacter))
               || (currentCharacter == ':' && text.ToString().Contains('@'));
      }

      return false;
    }

  }


}