我不知道为什么我的类无法序列化

Question

我完成了应用程序的编码。但是当我单击开始按钮时，我的应用程序引发了异常..:'(

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

所以我看到了“Application_UnhandledException”的参数 e，我可以知道原因。 “‘类型‘GPACalculator.Subject’无法序列化。请考虑使用 DataContractAttribute 属性对其进行标记，并使用 DataMemberAttribute 属性标记要序列化的所有成员。”

我只是使用默认数据类型创建我的类..

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));
    }
}

上面是我的类..

请帮助我

Answer 1

首先使用您想要使用的序列化器的适当属性来装饰您的类，例如用于 BinaryFormatter 的 [Serialized] 或用于基于契约的格式化程序的 [DataContract] 。

注意：如果您使用 [Serialized] 属性，请记住使用 [field:NonSerialized] 标记事件字段，否则这些事件的所有侦听器也将被序列化。

Answer 2

由于错误指出，您需要通过使用类上的 DataContract 属性和其属性的 DataMember 属性来装饰类，将其定义为可序列化。只有用 DataMember 修饰的公共属性才能序列化。你的方法和事件不能。

[DataContract]
public class Subject
{
    [DataMember]
    public string Name{get;set;}
}

更多信息

Answer 3

您可以尝试使用属性标记该类

[DataContract]
public class Subject : ...

或将其标记为可序列化，如下所示：

[Serializable]
public class Subject : ...

Answer 4

在这种情况下，两个类都应该是可序列化的。将 [Serialized] 添加到类中

Answer 5

这个问题是多余的。

如何忽略二进制序列化的事件类成员？

您在类中错过了 [Serialized] 属性，并且由于事件不可序列化，您需要将其标记为委托事件的 [field: NonSerialized] 。