public IEnumerable <MathsExercises> GetExample(int age)
{
// return _context.Exercises.ToArray<MathsExercises>();
var rng = new Random();
int SettingId = rng.Next(1, 101);
Guid guid = Guid.NewGuid();
for (int i = 0; i < 5; i++)
{
MathsExercises item = new MathsExercises();
item.SettingId = SettingId;// guid.ToString();
item.Formula = Logic.GetRandomFormula();
item.UserAnswer = "";
item.RightAnswer = CalcParenthesesExpression.CalculateParenthesesExpression(item.Formula);
item.CreateTime = DateTime.Now;
item.SaveTime = null;
// { HashValue = guid.ToString(),Formula = "1+2", Anwser = "", CreateTime = DateTime.Now, SaveTime = null
_context.Exercises.Add(item);
}
_context.SaveChanges();
return(_context.Exercises.Where(item => item.SettingId == SettingId).ToList());
// return Enumerable.Range(1, 5).Select(index => new MathsExercise.Models.MathsExercises
// {
// // DateFormatted = DateTime.Now.AddDays(index).ToString("d"),
// // TemperatureC = rng.Next(-20, 55),
// // Summary = Summaries[rng.Next(Summaries.Length)]
// ID = index,
// HashValue = index.ToString(),
// Formula="1+2",
// Anwser ="",
// CreateTime = DateTime.Today ,
// SaveTime = DateTime.Now
// });
}
public IEnumerable <VMathsExercise> GetQuestion(string hashvalue, int amount, string operation, int quantityarithmetic, string maxValueType, int maxValue)
{
#region Initial paramter
if (hashvalue.Length != 36)
{
// wrong value for hashvalue;
return(null);
}
int _amount = 20;
List <string> operations = new List <string>();
int _quantityarithmetic = 2;
// ensure quantity is valid data.
switch (amount)
{
case 5:
_amount = amount;
break;
case 10:
_amount = amount;
break;
case 30:
_amount = amount;
break;
case 40:
_amount = amount;
break;
case 50:
_amount = amount;
break;
default:
_amount = 20;
break;
}
Char[] items = operation.ToLower().ToCharArray();
foreach (char item in items)
{
if (item == 'a')
{
operations.Add("+"); continue;
}
if (item == 'b')
{
operations.Add("-"); continue;
}
if (item == 'c')
{
operations.Add("*"); continue;
}
if (item == 'd')
{
operations.Add("/"); continue;
}
}
//ensure operations has one action at least.
if (operations.Count <= 0)
{
operations.Add("+");
}
//ensure quantityarithmetic is between 1 and 5;
switch (quantityarithmetic)
{
case 1:
_quantityarithmetic = quantityarithmetic;
break;
case 3:
_quantityarithmetic = quantityarithmetic;
break;
case 4:
_quantityarithmetic = quantityarithmetic;
break;
case 5:
_quantityarithmetic = quantityarithmetic;
break;
default:
_quantityarithmetic = 2;
break;
}
//
string _maxValueType = "2";
int _maxValue = maxValue < 1?20:maxValue;
Setting setting = new Setting();
setting.CreateTime = DateTime.Now;
setting.Amount = _amount;
setting.QuantityOfOperation = _quantityarithmetic;
setting.MaxValue = _maxValue;
setting.GUIDValue = hashvalue;
setting.Operations = "";
foreach (string item in operations)
{
setting.Operations += item;
}
// _context.Setting.Add(setting);
// _context.SaveChanges();
SettingBll settingBll = new SettingBll(this._context);
if (settingBll.Insert(setting))
{
setting = settingBll.GetOne(hashvalue);
}
else
{
return(null);
}
#endregion
MathsExercisesBll exerBll = new MathsExercisesBll(this._context);
List <MathsExercises> Exercises = new List <MathsExercises>();
for (int i = 0; i < _amount; i++)
{
// Console.WriteLine("I=" + i.ToString());
MathsExercises item = new MathsExercises();
item.SettingId = setting.ID;
item.Formula = Logic.GetRandomFormula(operations, _quantityarithmetic, _maxValueType, _maxValue);
item.UserAnswer = "";
item.RightAnswer = CalcParenthesesExpression.CalculateParenthesesExpression(item.Formula);
item.CreateTime = DateTime.Now;
item.SaveTime = null;
// { HashValue = guid.ToString(),Formula = "1+2", Anwser = "", CreateTime = DateTime.Now, SaveTime = null
// _context.Exercises.Add(item);
Exercises.Add(item);
}
exerBll.Create(Exercises);
List <MathsExercises> result = exerBll.GetData(setting.ID);
List <VMathsExercise> rtn = new List <VMathsExercise>();
foreach (MathsExercises question in result)
{
VMathsExercise item = new VMathsExercise();
item.ID = question.ID;
item.Formula = question.Formula;
item.SettingId = question.SettingId;
item.CreateTime = question.CreateTime;
item.RightAnswer = question.RightAnswer;
rtn.Add(item);
}
return(rtn);
}