这是序列化错误还是数据契约错误

Question

我在一个类库中有这个小方法，该方法保存在外部 dll 中，远离“客户端”应用程序。

    public void SaveToDisk()
    {
        // Create a storage container and save
        // this instance to it. Use "this" storage name.
        var settingsToStore = this;
        var settings = IsolatedStorageSettings.ApplicationSettings;
        settings[StorageName] = settingsToStore;
        settings.Save();
    }

本质上，它会将自身存储到手机的隔离存储中。包含它的类没有标记任何属性。我得到的错误是这样的：

ex {"输入“CabbageWrapper.Account” 无法序列化。考虑标记 它与 DataContractAttribute 属性，并标记其所有 您想要序列化的成员 数据成员属性 属性。”} System.Exception {System.Runtime.Serialization.InvalidDataContractException}

我想知道错误意味着什么，而不仅仅是添加属性并祈祷它能起作用。谢谢！

编辑：根据要求，完整上课。

using System.IO.IsolatedStorage;

public class Account
{

    public string Provider { get; private set; }

    public string ServerSymbol { get; private set; }

    public int MessageCharAllowance { get; private set; }

    public int RemainingWebtextAllowance { get; set; }

    public int WebtextAllowance { get; private set; }

    public string Username { get; private set; }

    public string Password { get; private set; }

    public string StorageName { get; private set; }

    public Account(string provider, string storageName, string username, string password)
    {
        // Assign the values to "this" instance.
        Provider = provider;
        Username = username;
        Password = password;
        StorageName = storageName;

        // Load the ServerSymbol and WebtextAllowance from
        // the libraries resources. These are known values.
        PopulateKnownData();

        // Save to disk
        SaveToDisk();
    }


    public Account(string storageName)
    {
        // We need to know the name of the storage 
        // container to perform the load. Get it
        // from the caller and save it to "this" instance.
        StorageName = storageName;

        // Perform the load.
        LoadFromDisk();
    }


    private void PopulateKnownData()
    {
        switch (Provider)
        {
            case "Vodafone":
                ServerSymbol = "v";
                WebtextAllowance = 600;
                RemainingWebtextAllowance = -1;
                break;

            case "O2":
                ServerSymbol = "o";
                WebtextAllowance = 250;
                RemainingWebtextAllowance = -1;
                break;

            case "Meteor":
                ServerSymbol = "m";
                WebtextAllowance = 250;
                RemainingWebtextAllowance = -1;
                break;

            case "Three":
                ServerSymbol = "t";
                WebtextAllowance = 333;
                RemainingWebtextAllowance = -1;
                break;

            default:
                break;
        }
    }


    public void LoadFromDisk()
    {
        // Create a dummy account for rehydration and
        // use it to grab the stored account from memory.
        Account storedAccount;
        IsolatedStorageSettings.ApplicationSettings.TryGetValue(StorageName, out storedAccount);

        // Use the stored details to hydrate this instance.
        Provider = storedAccount.Provider;
        ServerSymbol = storedAccount.ServerSymbol;
        RemainingWebtextAllowance = storedAccount.RemainingWebtextAllowance;
        WebtextAllowance = storedAccount.WebtextAllowance;
        MessageCharAllowance = storedAccount.MessageCharAllowance;
        Username = storedAccount.Username;
        Password = storedAccount.Password;
    }


    public void SaveToDisk()
    {
        // Create a storage container and save
        // this instance to it. Use "this" storage name.
        var settingsToStore = this;
        var settings = IsolatedStorageSettings.ApplicationSettings;
        settings[StorageName] = settingsToStore;
        settings.Save();
    }
}

Answer 1

异常消息非常不言自明。通过用这些属性装饰成员，您可以告诉序列化器序列化哪些项目（大多数时候您只想序列化某些成员，而不是类中的所有成员）。您必须定义它们的原因很简单，您可以决定序列化什么和不序列化什么。还有性能、安全性等考虑，所以这就是默认情况下不这样做的原因。阅读 http://msdn.microsoft.com/en- us/library/system.runtime.serialization.datacontractserializer.aspx“将 DataContractAttribute 属性应用于类，将 DataMemberAttribute 属性应用于类成员，以指定序列化的属性和字段。”