调整更新方法

src/Hotline.Application/Exam/Service/Questions/QuestionService.cs

@@ -642,7 +642,9 @@ namespace Hotline.Application.Exam.Service.Questions
             // 简单和填空没有选项
             if (actionRequest.QuestionType.CheckSelectType()) return null;
 
-            var questionAnswer = _mapper.Map<QuestionAnswer>(actionRequest.QuestionAnswerDto);
+            var questionAnswer = await _questionAnswerRepository.GetAsync(actionRequest.QuestionAnswerDto.Id);
+
+           questionAnswer = _mapper.Map<UpdateQuestionAnswerDto, QuestionAnswer>(actionRequest.QuestionAnswerDto, questionAnswer);
 
             questionAnswer.QuestionId = actionRequest.Id;            
 
@@ -812,21 +814,23 @@ namespace Hotline.Application.Exam.Service.Questions
             if (actionRequest.QuestionAnswerDto.Id != null)
             {
                 actionRequest.QuestionAnswerDto.OperationStatus = EEOperationStatus.Update;
-            }
 
-            var add = await AddQuestionAnswer(_addQuestionDto, cancellationToken);
+                var update = await UpdateQuestionAnswer(actionRequest, cancellationToken);
 
-            if (add!=null)
-            {
-                questionAnswers.AddRange(add);
+                if (update != null)
+                {
+                    questionAnswers.Add(update);
+                }
             }
-
-            var update= await UpdateQuestionAnswer(actionRequest, cancellationToken);
-
-            if(update != null)
+            else
             {
-                questionAnswers.Add(update);
-            }
+                var add = await AddQuestionAnswer(_addQuestionDto, cancellationToken);
+
+                if (add != null)
+                {
+                    questionAnswers.AddRange(add);
+                }
+            }    
 
             if (actionRequest.QuestionAnswerDto != null && actionRequest.QuestionAnswerDto.OperationStatus == EEOperationStatus.Delete)
             {