private static void LoadHistory(string saveFile, Statuses status)
{
List<Question> allQuestion = status.AllQuestion;
//清空题目数组并重新填充
allQuestion.Clear();
status.CurrentIdx = -1;
// 收集已回答的id列表
HashSet<int> answeredIds = new HashSet<int>();
#region 加载文件内容
using (var sr = new StreamReader(saveFile, GB2312))
{
// 第一行是所有题目id列表，兼容代码，不使用这些id了
string line = sr.ReadLine();
// 第二行是考试类型
line = (sr.ReadLine() ?? string.Empty).Trim();
int typeInt;
if (!int.TryParse(line, out typeInt))
{
return;
}
status.ExamType = (ExamType)typeInt;
// 第3行开始，是回答完毕的用户答案情况
while (!sr.EndOfStream)
{
line = (sr.ReadLine() ?? string.Empty).Trim();
if (line == string.Empty)
{
continue;
}
var content = line.Split(','); //题号,回答,是否正确
var quesId = int.Parse(content[0].Trim());
if (answeredIds.Add(quesId))
{
var myAnswer = int.Parse(content[1].Trim());
Question question = LoadQuestion(quesId);
if (question == null)
{
return;
}
question.Answer = myAnswer;
allQuestion.Add(question);
}
}
}
#endregion
status.CurrentIdx = allQuestion.Count - 1;
status.PrevIdx = status.CurrentIdx;
int totalNum;
bool isRandom;
if (status.ExamType == ExamType.Examing)
{
totalNum = EXAM_NUM;
isRandom = true;
}
else if (status.ExamType == ExamType.Random)
{
totalNum = QUESTION_NUM;
isRandom = true;
}
else
{
totalNum = QUESTION_NUM;
isRandom = false;
}
int ret = 0;
// 考题不足时，补充
while (allQuestion.Count < totalNum)
{
if (isRandom)
{
ret = rnd.Next(1, QUESTION_NUM + 1);
while (!answeredIds.Add(ret))
{
ret = rnd.Next(1, QUESTION_NUM + 1);
}
}
else
{
ret++;
while (!answeredIds.Add(ret))
{
ret++;
}
}
Question ques = LoadQuestion(ret);
if (ques == null)
{
return;
}
allQuestion.Add(ques);
}
answeredIds.Clear();
}
private static void SaveHistory(Statuses status)
{
string saveFile = status.SaveFile;
if (!File.Exists(saveFile))
{
// 文件不存在时，创建
using (var sw = new StreamWriter(saveFile, false, GB2312))
{
// 保持空行，兼容旧历史的 保存全部题目 行
sw.WriteLine();
// 保存答题方式
sw.WriteLine((int)status.ExamType);
}
}
Question question = status.Ques;
using (var sw = new StreamWriter(saveFile, true, GB2312))
{
// 格式为：题号,回答,是否正确
sw.WriteLine("{0},{1},{2}",
question.id.ToString(), question.Answer.ToString(), question.IsRight.ToString());
}
}