添加项目文件。

ScriptPad/Editor/TextContainer.cs

@@ -0,0 +1,42 @@
+using System;
+using ICSharpCode.AvalonEdit.Document;
+using Microsoft.CodeAnalysis.Text;
+
+
+namespace ScriptPad.Editor
+{
+    public class TextContainer : SourceTextContainer , IDisposable
+    {
+        public TextContainer(TextDocument document)
+        {
+            this.TextDocument = document;
+            this.currentText = SourceText.From(document.GetText(0, document.TextLength));
+            document.Changed += Document_Changed;
+        }
+
+        private void Document_Changed(object sender, DocumentChangeEventArgs e)
+        {
+            var old = currentText;
+
+            var remove = new TextChange(new TextSpan(e.Offset, e.RemovalLength), "");
+            currentText = currentText.WithChanges(remove);
+            var insert = new TextChange(new TextSpan(e.Offset, 0), e.InsertedText.Text);
+            currentText = currentText.WithChanges(insert);
+
+            TextChanged?.Invoke(this, new Microsoft.CodeAnalysis.Text.TextChangeEventArgs(old, currentText, remove, insert));
+        }
+
+        public TextDocument TextDocument { get; private set; }
+
+        private SourceText currentText;
+        public override SourceText CurrentText => currentText;
+
+        public override event EventHandler<Microsoft.CodeAnalysis.Text.TextChangeEventArgs> TextChanged;
+
+        public void Dispose()
+        {
+            this.TextDocument.Changed -= Document_Changed;
+        }
+    }
+
+}