添加项目文件。

ScriptPad/Service/CompletionService.cs

@@ -0,0 +1,42 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Completion;
+using Microsoft.CodeAnalysis.Text;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ScriptPad.Service
+{
+    public class ScriptCompletionService
+    {
+        public static async Task<IEnumerable<Editor.CodeCompletionData>> GetCompletionsAsync(DocumentId id, int position)
+        {
+            var document = Roslyn.ScriptingWorkspace.GetInstance().GetDocument(id);
+            var completionService = CompletionService.GetService(document);
+            var list = await completionService.GetCompletionsAsync(document, position);
+
+            if (list == null || !list.Items.Any())
+                return new List<Editor.CodeCompletionData>();
+
+            return list.Items.Select(p => new Editor.CodeCompletionData(id, p));
+        }
+
+        public static async Task<string> GetDescriptionAsync(DocumentId id, CompletionItem completionItem)
+        {
+            var document = Roslyn.ScriptingWorkspace.GetInstance().GetDocument(id);
+            var completionService = CompletionService.GetService(document);
+            var des = await completionService.GetDescriptionAsync(document, completionItem);
+            return des.Text;
+        }
+
+        public static bool IsTrigger(DocumentId id, SourceText text, int position, char? triggerChar)
+        {
+            var document = Roslyn.ScriptingWorkspace.GetInstance().GetDocument(id);
+            var completionService = CompletionService.GetService(document);
+            if(triggerChar != null)
+                return completionService.ShouldTriggerCompletion(text, position, CompletionTrigger.CreateInsertionTrigger(triggerChar.Value));
+            return completionService.ShouldTriggerCompletion(text, position, CompletionTrigger.Invoke);
+        }
+    }
+}