6
मैंने अपना आवेदन कोडिंग पूरा किया। लेकिन जब मैं प्रारंभ बटन क्लिक करें, मेरे ऐप एक अपवाद उठाया ..: '(मुझे नहीं पता कि मेरी कक्षा को क्यों क्रमबद्ध नहीं किया जा सकता है
A first chance exception of type 'System.Runtime.Serialization.InvalidDataContractException' occurred in System.Runtime.Serialization.dll
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll
A first chance exception of type 'System.Runtime.Serialization.InvalidDataContractException' occurred in System.Runtime.Serialization.dll
तो मैं का तर्क ई देखा' Application_UnhandledException ', और मैं कारण जान सकता "।' टाइप 'GPACalculator.Subject' धारावाहिक नहीं किया जा सकता। DataContractAttribute विशेषता के साथ अंकन, और आप DataMemberAttribute विशेषता के साथ धारावाहिक चाहते इसके सभी सदस्यों को अंकन पर विचार करें। "
मैं बस डिफ़ॉल्ट डेटा प्रकार का उपयोग कर मेरी कक्षा बनाने ..
public class Subject : INotifyPropertyChanged
{
private string name;
private GradePoint gradePoint;
private int credit;
public Subject(string name)
{
Name = name;
GradePoint = new GradePoint();
}
public string Name
{
get { return name; }
set
{
Debug.WriteLine("Name: " + value);
if (name != value)
{
name = value;
OnPropertyChanged("Name");
}
}
}
public GradePoint GradePoint
{
get { return gradePoint; }
set
{
if (gradePoint != value)
{
gradePoint = value;
OnPropertyChanged("GradePoint");
}
}
}
public int Credit
{
get { return credit; }
set
{
if (credit != value)
{
credit = value;
OnPropertyChanged("Credit");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public class GradePoint : INotifyPropertyChanged
{
private string mainGradePoint;
private string subGradePoint;
private int credit;
public int Credit
{
get { return credit; }
set
{
if (credit != value)
{
credit = value;
OnPropertyChanged("Credit");
}
}
}
public string MainGradePoint
{
get { return mainGradePoint; }
set
{
value = value.ToUpper();
if (mainGradePoint != value)
{
mainGradePoint = value;
OnPropertyChanged("MainGradePoint");
}
}
}
public string SubGradePoint
{
get { return subGradePoint; }
set
{
if (subGradePoint != value)
{
subGradePoint = value;
OnPropertyChanged("SubGradePoint");
}
}
}
public override string ToString()
{
return string.Format("{0}{1}", mainGradePoint, subGradePoint);
}
public double ToDouble(double perfectScore = 4.5F)
{
double gap = perfectScore - Math.Floor(perfectScore);
double value;
switch (mainGradePoint)
{
case "A":
value = 4.0;
break;
case "B":
value = 3.0;
break;
case "C":
value = 2.0;
break;
case "D":
value = 1.0;
break;
default:
value = 0.0;
return value;
}
switch (subGradePoint)
{
case "+":
value += gap;
break;
case "-":
value -= gap;
break;
}
return value;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
ऊपर एम है y वर्ग ..
कृपया मुझे
बहुत बहुत धन्यवाद :) –