exam_service
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SpecialX
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TechHelper.Client/Exam/ExamPaperExtensions .cs
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TechHelper.Client/Exam/ExamPaperExtensions .cs
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using Entities.DTO;
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using System.Text.Json.Serialization;
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using System.Text.Json;
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namespace TechHelper.Client.Exam
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{
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public static class ExamPaperExtensions
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{
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public static ExamDto ConvertToExamDTO(this ExamPaper examPaper)
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{
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ExamDto dto = new ExamDto();
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dto.AssignmentTitle = examPaper.AssignmentTitle;
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dto.Description = examPaper.Description;
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dto.SubjectArea = examPaper.SubjectArea;
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dto.QuestionGroups.Title = examPaper.AssignmentTitle;
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dto.QuestionGroups.Descript = examPaper.Description;
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// 处理顶级 QuestionGroups
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foreach (var qg in examPaper.QuestionGroups)
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{
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var qgd = new QuestionGroupDto();
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// 顶级 QuestionGroup，其父组当然无效 (false)，所以 isParentGroupValidChain 为 false
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ParseMajorQuestionGroup(qg, qgd, false);
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dto.QuestionGroups.SubQuestionGroups.Add(qgd);
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}
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// 处理 TopLevelQuestions
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foreach (var question in examPaper.TopLevelQuestions)
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{
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// 对于 TopLevelQuestions，它们没有父组，所以 isParentGroupValidChain 初始为 false
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// 如果顶级 Question 包含子问题，则将其视为一个 QuestionGroupDto
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if (question.SubQuestions != null && question.SubQuestions.Any())
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{
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var qgDto = new QuestionGroupDto
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{
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Title = question.Stem,
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Score = (int)question.Score,
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Descript = "", // 顶级 Question 默认无描述
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};
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// 判断当前组是否有效：如果有描述，则为有效组
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qgDto.ValidQuestionGroup = !string.IsNullOrEmpty(qgDto.Descript);
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// 传递给子项的 isParentGroupValidChain 状态：如果当前组有效，则传递 true；否则继承父级状态 (此处为 false)
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ParseQuestionWithSubQuestions(question, qgDto, qgDto.ValidQuestionGroup);
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dto.QuestionGroups.SubQuestionGroups.Add(qgDto);
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}
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else // 如果顶级 Question 没有子问题，则它本身就是一个独立的 SubQuestionDto，放在一个容器 QuestionGroupDto 中
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{
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var qgDto = new QuestionGroupDto
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{
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Title = question.Stem,
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Score = (int)question.Score,
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Descript = "", // 独立题目的容器组通常无描述
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};
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// 独立题目的容器组，如果没有描述，则不是“有效组”
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qgDto.ValidQuestionGroup = !string.IsNullOrEmpty(qgDto.Descript);
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var subQuestionDto = new SubQuestionDto();
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// 此时，qgDto.ValidQuestionGroup 为 false，所以传入 true，表示题目是有效的
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// 因为其父组链 (此处为自身) 不是有效组
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ParseSingleQuestion(question, subQuestionDto, !qgDto.ValidQuestionGroup);
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qgDto.SubQuestions.Add(subQuestionDto);
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dto.QuestionGroups.SubQuestionGroups.Add(qgDto);
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}
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}
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return dto;
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}
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// 解析 MajorQuestionGroup 及其子项
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// isParentGroupValidChain 参数表示从顶层到当前组的任一父组是否已经是“有效组”
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private static void ParseMajorQuestionGroup(MajorQuestionGroup qg, QuestionGroupDto qgd, bool isParentGroupValidChain)
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{
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qgd.Title = qg.Title;
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qgd.Score = (int)qg.Score;
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qgd.Descript = qg.Descript;
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// 判断当前组是否有效：如果有描述，并且其父级链中没有任何一个组是有效组，则当前组有效
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qgd.ValidQuestionGroup = !string.IsNullOrEmpty(qg.Descript) && !isParentGroupValidChain;
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// 更新传递给子项的 isParentGroupValidChain 状态：
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// 如果当前组是有效组 (即 qgd.ValidQuestionGroup 为 true)，那么子项的父级链就包含了有效组
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// 否则，子项的父级链有效性继承自其父级 (isParentGroupValidChain)
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bool nextIsParentGroupValidChain = qgd.ValidQuestionGroup || isParentGroupValidChain;
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// 处理子 QuestionGroup
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if (qg.SubQuestionGroups != null)
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{
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qg.SubQuestionGroups.ForEach(sqg =>
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{
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var sqgd = new QuestionGroupDto();
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ParseMajorQuestionGroup(sqg, sqgd, nextIsParentGroupValidChain);
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qgd.SubQuestionGroups.Add(sqgd);
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});
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}
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// 处理 MajorQuestionGroup 下的 SubQuestions
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if (qg.SubQuestions != null)
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{
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qg.SubQuestions.ForEach(sq =>
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{
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// 如果 MajorQuestionGroup 下的 Question 包含子问题，则转为 QuestionGroupDto
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if (sq.SubQuestions != null && sq.SubQuestions.Any())
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{
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var subQgd = new QuestionGroupDto
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{
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Title = sq.Stem,
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Score = (int)sq.Score,
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Descript = "" // 默认为空
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};
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// 判断当前组是否有效：如果有描述，并且其父级链中没有任何一个组是有效组，则当前组有效
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subQgd.ValidQuestionGroup = !string.IsNullOrEmpty(subQgd.Descript) && !nextIsParentGroupValidChain;
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ParseQuestionWithSubQuestions(sq, subQgd, subQgd.ValidQuestionGroup || nextIsParentGroupValidChain);
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qgd.SubQuestionGroups.Add(subQgd);
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}
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else // 如果 MajorQuestionGroup 下的 Question 没有子问题，则转为 SubQuestionDto
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{
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var subQd = new SubQuestionDto();
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// 只有当所有父组（包括当前组）都不是有效组时，这个题目才有效
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ParseSingleQuestion(sq, subQd, !nextIsParentGroupValidChain);
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qgd.SubQuestions.Add(subQd);
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}
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});
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}
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}
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// 解析包含子问题的 Question，将其转换为 QuestionGroupDto
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// isParentGroupValidChain 参数表示从顶层到当前组的任一父组是否已经是“有效组”
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private static void ParseQuestionWithSubQuestions(Question question, QuestionGroupDto qgd, bool isParentGroupValidChain)
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{
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qgd.Title = question.Stem;
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qgd.Score = (int)question.Score;
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qgd.Descript = ""; // 默认为空
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// 判断当前组是否有效：如果有描述，并且其父级链中没有任何一个组是有效组，则当前组有效
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qgd.ValidQuestionGroup = !string.IsNullOrEmpty(qgd.Descript) && !isParentGroupValidChain;
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// 更新传递给子项的 isParentGroupValidChain 状态
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bool nextIsParentGroupValidChain = qgd.ValidQuestionGroup || isParentGroupValidChain;
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if (question.SubQuestions != null)
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{
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question.SubQuestions.ForEach(subQ =>
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{
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// 如果子问题本身还有子问题（多层嵌套），则继续创建 QuestionGroupDto
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if (subQ.SubQuestions != null && subQ.SubQuestions.Any())
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{
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var nestedQgd = new QuestionGroupDto
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{
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Title = subQ.Stem,
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Score = (int)subQ.Score,
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Descript = "" // 默认为空
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};
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// 判断当前组是否有效：如果有描述，并且其父级链中没有任何一个组是有效组，则当前组有效
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nestedQgd.ValidQuestionGroup = !string.IsNullOrEmpty(nestedQgd.Descript) && !nextIsParentGroupValidChain;
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ParseQuestionWithSubQuestions(subQ, nestedQgd, nestedQgd.ValidQuestionGroup || nextIsParentGroupValidChain);
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qgd.SubQuestionGroups.Add(nestedQgd);
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}
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else // 如果子问题没有子问题，则直接创建 SubQuestionDto
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{
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var subQd = new SubQuestionDto();
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// 只有当所有父组（包括当前组）都不是有效组时，这个题目才有效
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ParseSingleQuestion(subQ, subQd, !nextIsParentGroupValidChain);
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qgd.SubQuestions.Add(subQd);
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}
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});
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}
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}
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// 解析单个 Question (没有子问题) 为 SubQuestionDto
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private static void ParseSingleQuestion(Question question, SubQuestionDto subQd, bool validQ)
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{
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subQd.Stem = question.Stem;
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subQd.Score = (int)question.Score;
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subQd.ValidQuestion = validQ; // 根据传入的 validQ 确定是否是“有效题目”
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subQd.SampleAnswer = question.SampleAnswer;
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subQd.QuestionType = question.QuestionType;
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// 注意：DifficultyLevel 在本地 Question 中没有，如果服务器需要，可能需要补充默认值或从其他地方获取
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// subQd.DifficultyLevel = ...;
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if (question.Options != null)
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{
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question.Options.ForEach(o =>
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{
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subQd.Options.Add(new OptionDto { Value = o.Label + o.Text });
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});
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}
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}
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public static string SerializeExamDto(this ExamDto dto)
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{
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// 配置序列化选项（可选）
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var options = new JsonSerializerOptions
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{
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WriteIndented = true,
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
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};
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return JsonSerializer.Serialize(dto, options);
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}
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public static ExamDto DeserializeExamDto(string jsonString)
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{
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var options = new JsonSerializerOptions
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{
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase
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};
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return JsonSerializer.Deserialize<ExamDto>(jsonString, options);
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}
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}
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}
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