小编Jon*_*eon的帖子

我完成了我的申请编码.但是,当我点击开始按钮时,我的应用程序引发了一个例外..:'(

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'的参数e,我可以知道原因."'Type'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来创建我的类.

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)
            { …