我不知道為什么我的班級無法序列化

Question

我完成了我的申請編碼。 但是，當我點擊開始按鈕時，我的應用程序引發了一個例外..：'（

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'Application_UnhandledException'的參數e，我可以知道原因。 “'Type'GPACalculator.Subject'無法序列化。請考慮使用DataContractAttribute屬性對其進行標記，並使用DataMemberAttribute屬性標記要序列化的所有成員。”

我只是使用默認數據類型來創建我的類。

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));
    }
}

以上是我的班級..

請幫我

Answer 1

首先使用您想要使用的序列化程序的相應屬性來修飾類，例如，用於BinaryFormatter的[Serializable] ，或用於基於合同的格式化程序的[DataContract] 。

注意：如果使用[Serializable]屬性，請記住使用[field:NonSerialized]標記事件字段，否則這些事件的所有偵聽器也將被序列化。

Answer 2

由於錯誤聲明您需要將類定義為可序列化，方法是使用類的DataContract屬性和其屬性的DataMember屬性進行裝飾。 只能序列化使用DataMember修飾的公共屬性。 你的方法和事件不能。

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

更多信息在這里

Answer 3

您可以嘗試使用該屬性標記該類

[DataContract]
public class Subject : ...

或標記它可序列化如下：

[Serializable]
public class Subject : ...

Answer 4

在這種情況下，兩個類都應該是可序列化的。 將[Serializable]添加到類中

Answer 5

這個問題是多余的。

如何忽略二進制序列化的Event類成員？

您錯過了類中的[Serializable]屬性，並且因為事件不是可連續的，您需要將其標記為[field: NonSerialized]到您的委托事件。