c# - 在 C# 中将 FileInfo 对象序列化为 XML

Question

我正在尝试序列化 IEnumerable<FileInfo>到 XML 中。我研究发现，因为FileInfo类没有无参构造函数，所以不能按原样序列化，应该使用包装类。

为简单起见，我用来序列化的代码位于 winforms 按钮的单击事件中，如图所示。一旦它工作，我将重构它:

    private void button1_Click(object sender, System.EventArgs e)
    {
        IEnumerable<FileInfo> allfiles = FileGetter.FileInfoAllFiles();

        FileList filelist = new FileList();

        foreach (var file in allfiles)
        {
            filelist.Add(new FileInfoSerializable(file));
        }

        var stream = new FileStream("Xmllist.xml", FileMode.Create);
        new XmlSerializer(typeof(FileInfoSerializable)).Serialize(stream, filelist);

    }

包装类:

[Serializable]
public class FileInfoSerializable
{

    private readonly FileInfo _fileInfo;

    #region ~~~ Constructors ~~~

    public FileInfoSerializable() { } 

    public FileInfoSerializable(FileInfo FileInfo) { _fileInfo = FileInfo; }

    #endregion


    #region ~~~ Properties ~~~

    public string Name { get { return _fileInfo.Name; } set { } }

    public string FullName { get { return _fileInfo.FullName; } set { } }

    public long Length { get { return _fileInfo.Length; } set { } }

    public string Extension { get { return _fileInfo.Extension; } set { } }

    public DateTime LastWriteTime { get { return _fileInfo.LastWriteTime; } set { } }

    public string DirectoryName { get { return _fileInfo.DirectoryName; } set { } }

    #endregion
}

我想在 IEnumerable<FileInfo> 中添加每个 FileInfo 对象到一个集合，然后我将序列化。这是保存集合的类:

[Serializable]
public class FileList
{
    public List<FileInfoSerializable> filez { get; set; }

    public FileList()
    {
        filez = new List<FileInfoSerializable>();
    }

    public void Add(FileInfoSerializable m)
    {
        filez.Add(m);
    }
}

问题

我在该行收到以下异常:new XmlSerializer(typeof(FileInfoSerializable)).Serialize(stream, filelist);

我尝试转换为通用列表，使用 filelist.filez 代替 filelist，但仍然出现相同的错误。我需要更改什么才能使这项工作正常进行？

干杯

Answer 1

我终于找到问题了。 typeof(FileInfoSerializable) 应该是 typeof(FileList)。下面的代码有效。 FileInfoSerializable 在 xml 的根级别创建一个数组。 xml 的根必须是单数。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.IO;

namespace ConsoleApplication49
{
    class Program
    {

        static void Main(string[] args)
        {
            List<FileInfo> allfiles = Directory.GetFiles(@"c:\temp").Select(x => new FileInfo(x)).ToList();

            FileList filelist = new FileList();

            foreach (var file in allfiles)
            {
                filelist.Add(new FileInfoSerializable(file));
            }

            var stream = new FileStream("c:\\temp\\Xmllist.xml", FileMode.Create);

            XmlSerializer serializer = new XmlSerializer(typeof(FileList));

            serializer.Serialize(stream, filelist);


        }
    }
    [Serializable]
    public class FileInfoSerializable
    {

        private readonly FileInfo _fileInfo;

        #region ~~~ Constructors ~~~

        public FileInfoSerializable() { }

        public FileInfoSerializable(FileInfo FileInfo) { _fileInfo = FileInfo; }

        #endregion


        #region ~~~ Properties ~~~

        public string Name { get { return _fileInfo.Name; } set { } }

        public string FullName { get { return _fileInfo.FullName; } set { } }

        public long Length { get { return _fileInfo.Length; } set { } }

        public string Extension { get { return _fileInfo.Extension; } set { } }

        public DateTime LastWriteTime { get { return _fileInfo.LastWriteTime; } set { } }

        public string DirectoryName { get { return _fileInfo.DirectoryName; } set { } }

        #endregion
    }

    [Serializable]
    public class FileList
    {
        public List<FileInfoSerializable> filez { get; set; }

        public FileList()
        {
            filez = new List<FileInfoSerializable>();
        }

        public void Add(FileInfoSerializable m)
        {
            filez.Add(m);
        }
    }
}