C# 我不知道'；我不知道为什么我的类不能序列化

我完成了应用程序的编码。但当我点击“开始”按钮时，我的应用程序引发了一个异常(

所以我看到了“Application\u UnhandledException”的参数e，我可以知道原因。 “类型”GPACalCultActudio。不能序列化。请考虑用DATACONTractAttor属性标记它，并标记要用DATAMEMBAREATION属性序列化的所有成员。“

” 我只是使用默认数据类型创建类

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));
    }
}

以上是我的班级

---

请帮助我

因为错误说明您需要通过在类上使用DataContract属性对类进行修饰，并将DataMember属性对其属性进行修饰，从而将类定义为可序列化的。只能序列化使用DataMember修饰的公共属性。您的方法和事件无法序列化

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

---

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

您可以尝试使用属性标记该类

[DataContract]
public class Subject : ...

或者将其标记为可序列化，如下所示：

[Serializable]
public class Subject : ...

---

首先，使用要使用的序列化程序的适当属性装饰类，例如，对于BinaryFormatter，使用

[Serializable]

，对于基于协定的格式化程序，使用

[DataContract]

---

注意：如果使用[Serializable]属性，请记住用

[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。

这个问题是多余的

您在类中缺少了

[Serializable]

属性，而且由于事件不可序列化，您需要将其标记为代理事件的

[field:NonSerialized]

[Serializable]
public class Subject : ...