/// <summary>
/// 添加问题
/// </summary>
/// <param name="description"></param>
/// <returns></returns>
public QuestionOption AddQuestionOption(string description)
{
var questionOption = QuestionOption.CreateNew(this, description);
if (QuestionOptions == null)
{
QuestionOptions = new List <QuestionOption>();
}
QuestionOptions.Add(questionOption);
return(questionOption);
}
/// <summary>
/// 设置正确选项
/// </summary>
/// <param name="questionOptionGuid"></param>
public void SetCorrectOption(Guid questionOptionGuid)
{
if (QuestionOptions == null)
{
throw new Exception($"问题选项{questionOptionGuid}不存在！");
}
var qOption = QuestionOptions.FirstOrDefault(p => p.QuestionOptionGuid.Equals(questionOptionGuid));
CorrectOption = qOption ?? throw new Exception($"问题选项{questionOptionGuid}不存在！");
CorrectOptionId = questionOptionGuid;
}
/// <summary>
/// 删除问题选项
/// </summary>
/// <param name="questionOptionGuid"></param>
public void RemoveQuestionOption(Guid questionOptionGuid)
{
if (QuestionOptions == null)
{
throw new Exception($"问题选项{questionOptionGuid}不存在！");
}
var qOption = QuestionOptions.FirstOrDefault(p => p.QuestionOptionGuid.Equals(questionOptionGuid));
if (qOption == null)
{
throw new Exception($"问题选项{questionOptionGuid}不存在！");
}
QuestionOptions.Remove(qOption);
if (qOption.QuestionOptionGuid.Equals(CorrectOptionId))
{
CorrectOptionId = default(Guid);
CorrectOption = null;
}
}
/// <summary>
/// 修改问题选项
/// </summary>
/// <param name="questionOptionGuid"></param>
/// <param name="description"></param>
public void UpdateQuestionOption(Guid questionOptionGuid, string description)
{
if (QuestionOptions == null)
{
throw new Exception($"问题选项{questionOptionGuid}不存在！");
}
var qOption = QuestionOptions.FirstOrDefault(p => p.QuestionOptionGuid.Equals(questionOptionGuid));
if (qOption == null)
{
throw new Exception($"问题选项{questionOptionGuid}不存在！");
}
qOption.UpdateDescription(description);
if (qOption.QuestionOptionGuid.Equals(CorrectOptionId))
{
CorrectOption = qOption;
}
}