public QuestionSet GenererateTest(int maxCount, bool isRandomize)
{
byte[] rndBuf = new byte[sizeof(int)];
RNGCryptoServiceProvider rndGen = new RNGCryptoServiceProvider();
QuestionSet qs = new QuestionSet(name + ".Test");
List <int> rndKeys = new List <int>();
Dictionary <int, int> questionPool = new Dictionary <int, int>();
//Dictionary<int, int> questionIndex = new Dictionary<int, int>();
rndGen.GetBytes(rndBuf);
foreach (string s in selectedCategories)
{
if (categoryIndex.ContainsKey(s))
{
foreach (int qID in categoryIndex[s])
{
if (!questionPool.ContainsValue(qID))
{
if (selectedSources.Contains(questions[qID].Source))
{
rndGen.GetBytes(rndBuf);
int rndKey = isRandomize ? BitConverter.ToInt32(rndBuf, 0) : qID;
questionPool.Add(rndKey, qID);
rndKeys.Add(rndKey);
}
}
}
}
}
rndKeys.Sort();
if (maxCount > rndKeys.Count)
{
maxCount = rndKeys.Count;
}
for (int i = 0; i < maxCount; i++)
{
Question q = this.questions[questionPool[rndKeys[i]]].Copy(isRandomize);
if (q.Categories.Count > 1)
{
string cat = "";
do
{
rndGen.GetBytes(rndBuf);
int rndKey = Math.Abs(BitConverter.ToInt32(rndBuf, 0)) % q.Categories.Count;
cat = q.Categories[rndKey];
} while (!IsCategorySelected(cat));
q.Categories.Clear();
q.Categories.Add(cat);
}
qs[i] = q;
}
return(qs);
}
public static QuestionSet LoadFromXML(string fileName)
{
QuestionSet qs = null;
Stream zip =
new DeflateStream(new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read),
CompressionMode.Decompress, false);
XmlReader xReader = null;
try
{
xReader = XmlReader.Create(zip);
}
catch
{
xReader = XmlReader.Create(fileName);
}
using (xReader)
{
Question q = null;
xReader.Read();
while (!xReader.EOF)
{
switch (xReader.NodeType)
{
case XmlNodeType.Element:
switch (xReader.Name)
{
case "Questions":
qs = new QuestionSet(xReader["Name"]);
xReader.Read();
break;
case "Question":
if (q != null)
{
if (qs != null)
{
qs[q.ID] = q;
}
}
q = new Question(Convert.ToInt32(xReader["ID"]));
xReader.Read();
break;
case "Category":
if (q != null)
{
q.Categories.Add(xReader.ReadElementContentAsString());
}
break;
case "Source":
if (q != null)
{
q.Source = xReader.ReadElementContentAsString();
}
break;
case "Text":
if (q != null)
{
Question.TextSectionFormat fmt = Question.TextSectionFormat.None;
if (xReader.HasAttributes)
{
fmt = (Question.TextSectionFormat)
Enum.Parse(typeof(Question.TextSectionFormat), xReader["Format"]);
}
q.AppendTextSection(fmt, xReader.ReadElementContentAsString().Replace("\n", "\r\n"));
}
else
{
xReader.Read();
}
break;
case "Answer":
if (q != null)
{
bool valid = Convert.ToBoolean(xReader["Valid"]);
q.Answer.Variants.Add(new Variant(xReader.ReadElementContentAsString().Replace("\n", "\r\n"), valid));
}
else
{
xReader.Read();
}
break;
default:
xReader.Read();
break;
}
break;
default:
xReader.Read();
break;
}
}
if (q != null)
{
if (qs != null)
{
qs[q.ID] = q;
}
}
}
qs.fileName = fileName;
qs.isModified = false;
return(qs);
}