diff --git a/DocumentManagement/DocumentEntity/EventCodeCompiler.cs b/DocumentManagement/DocumentEntity/EventCodeCompiler.cs
index c48b98c..b3dd192 100644
--- a/DocumentManagement/DocumentEntity/EventCodeCompiler.cs
+++ b/DocumentManagement/DocumentEntity/EventCodeCompiler.cs
@@ -45,25 +45,25 @@ namespace DocumentManagement
 
         private void Eet_ContentChanging(object eventSender, ContentChangingEventArgs args)
         {
-            if (eventSender is XTextInputFieldElement xife)
+            if (eventSender is XTextInputFieldElement xife&& args.InsertingElements is { })
             {
                 var txtAll = args.InsertingElements.Select(c => c.Text).ToList();
                 var txt = string.Concat(txtAll);
                 if (txtAll.Any(c=>c.Contains("�")))
                 {
 
-                    var clip = Clipboard.GetText().Trim();
+                    var clip = Clipboard.GetText()?.Trim();
                     xife.Text = clip;
                     args.Cancel = true;
                     return;
                     args.InsertingElements.Clear();
                     args.InsertingElements.Add(new XTextStringElement() { Text = clip });
                 }
-                byte[] originalBytes = Encoding.UTF8.GetBytes(txt);  // 这里使用 UTF8 是假设或猜测
-                string decodedString = Encoding.GetEncoding("GB2312").GetString(originalBytes);  // 用其他编码尝试解码
+                //byte[] originalBytes = Encoding.UTF8.GetBytes(txt);  // 这里使用 UTF8 是假设或猜测
+                //string decodedString = Encoding.GetEncoding("GB2312").GetString(originalBytes);  // 用其他编码尝试解码
 
-                byte[] originalBytes2 = Encoding.GetEncoding("GB2312").GetBytes(txt);  // 这里使用 UTF8 是假设或猜测
-                string decodedString2 = Encoding.UTF8.GetString(originalBytes2);  // 用其他编码尝试解码
+                //byte[] originalBytes2 = Encoding.GetEncoding("GB2312").GetBytes(txt);  // 这里使用 UTF8 是假设或猜测
+                //string decodedString2 = Encoding.UTF8.GetString(originalBytes2);  // 用其他编码尝试解码
             }
         }