Question

我正在尝试创建一个类，它可以通过使用.NET XmlSerializer类对XML文件进行序列化和反序列化。我已经使用了保存功能（“SaveSettings”），但是加载功能并不是那么简单。

目前我不得不将类变量的引用传递给函数以使加载函数起作用（“LoadSettings2”）什么是理想的只是使用'this'关键字（“LoadSettings”）是无论如何要创建一个只需要传递文件路径的LoadSettings函数吗？

的Program.cs：

class Program
{
    static void Main(string[] args)
    {
        ApplicationSettings appSet = new ApplicationSettings();
        appSet.SourceDirectory = "here";
        appSet.DestinationDirectory = "there";

        appSet.SaveSettings(@"C:\Users\Connor\Desktop\Folder A\a.xml");
        //appSet.LoadSettings(@"C:\Users\Connor\Desktop\Folder A\a.xml"); //Doesn't work
        appSet.LoadSettings2(ref appSet, @"C:\Users\Connor\Desktop\Folder A\a.xml");
    }
}

ApplicationSettings.cs：

public class ApplicationSettings
{
    //Serialized
    public string SourceDirectory;
    public string DestinationDirectory;

    //Not Serialized
    public void SaveSettings(string filePath)
    {
        XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
        StreamWriter strWrite = new StreamWriter(filePath);

        XSerializer.Serialize(strWrite, this);
        strWrite.Close();
    }

    public void LoadSettings(string filePath)
    {
        XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
        StreamReader strRead = new StreamReader(filePath);

        //Ideal but will not work
        //this = (ApplicationSettings)XSerializer.Deserialize(strRead);
        strRead.Close();
    }

    public void LoadSettings2(ref ApplicationSettings appSettings, string filePath)
    {
        XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
        StreamReader strRead = new StreamReader(filePath);

        appSettings = (ApplicationSettings)XSerializer.Deserialize(strRead);
        strRead.Close();
    }
}

-

- 回答---

通过使用'David M'建议的成员副本来完成成员工作但是通过使用System.Reflection来完成它，这意味着没有使用变量名称。我相信只复制公共变量，需要对类进行更多测试。需要大约1.8秒才能执行10k次迭代。

public void LoadSettings(string filePath)
{
    XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
    StreamReader strRead = new StreamReader(filePath);
    ApplicationSettings settingsRead = (ApplicationSettings)XSerializer.Deserialize(strRead);

    foreach (var field in typeof(ApplicationSettings).GetFields())
    {
        field.SetValue(this, field.GetValue(settingsRead));
    }

    strRead.Close();
}

Answer 1

改为使其成为静态工厂方法：

public static ApplicationSettings LoadSettings(string filePath)
{
    XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
    using (StreamReader strRead = new StreamReader(filePath))
    {
        var result = (ApplicationSettings)XSerializer.Deserialize(strRead);
    }
    return result;
}

否则，您将不得不反序列化到另一个实例，并且成员逐个会将值复制到当前实例。请注意，使用using StreamReader阻止您的情况会更好 - Dispose调用将确保释放文件句柄。

Answer 2

为什么不将LoadSettings()设为static方法，并将其称为：

ApplicationSettings applicationSettings = ApplicationSettings.LoadSettings();

Answer 3

通过使用'David M'建议的成员副本来完成成员工作但是通过使用System.Reflection来完成它，这意味着没有使用变量名称。我相信只复制公共变量，需要对类进行更多测试。需要大约1.8秒才能执行10k次迭代。

public void LoadSettings(string filePath)
{
    XmlSerializer XSerializer = new XmlSerializer(typeof(ApplicationSettings));
    StreamReader strRead = new StreamReader(filePath);
    ApplicationSettings settingsRead = (ApplicationSettings)XSerializer.Deserialize(strRead);

    foreach (var field in typeof(ApplicationSettings).GetFields())
    {
        field.SetValue(this, field.GetValue(settingsRead));
    }

    strRead.Close();
}

C＃：如何从内部写一个类？

3 个答案: