serializable 对象序列化

序列化其实是对象和字符串（文件）之间的互相转换。

二进制序列化

类型前面添加了[serializable]特性的类就是可序列化类型。
SerializableAttribute特性只能应用于引用类型（class）、值类型（struct）、枚举类型（enum）和委托类型（delegate）。
枚举和委托类型总是可序列化的，所以不必显示使用SerializableAttribute特性。

序列化会读取对象的所有字段保存成二进制。
如果必须序列化该对象，则可将 [NonSerialized] 属性应用于存储敏感数据的特定字段。

using System;
var demo = new Demo();
demo.Number = 100;
demo.Text = "hhhhh";
Console.WriteLine(demo.ToString());
var str = SerializerHelper.BinarySerialize(demo);
Console.WriteLine(str);
var aa = SerializerHelper.BinaryDeserialize<Demo>(str);
Console.WriteLine(aa.ToString());

[Serializable]
public class Demo
{
	private int _field = DateTime.Now.Millisecond;
        public string Test = "Test";
	public int Number { get; set; }
	public string Text { get; set; }
	public override string ToString()
	{
		return $"({Number}, {Text}) {_field} {Test}";
	}
}

public static partial class SerializerHelper
{
	/// <summary>
	/// 二进制序列化
	/// </summary>
	/// <typeparam name="T"></typeparam>
	/// <param name="obj"></param>
	/// <returns></returns>
	public static string BinarySerialize<T>(T obj)
	{
		BinaryFormatter serializer = new BinaryFormatter();
		using (var ms = new MemoryStream())
		{
			serializer.Serialize(ms, obj);
			return Convert.ToBase64String(ms.ToArray());
		}
	}
	/// <summary>
	/// 二进制反序列化
	/// </summary>
	/// <typeparam name="T"></typeparam>
	/// <param name="txt"></param>
	/// <returns></returns>
	public static T BinaryDeserialize<T>(string txt)
	{
		var data = Convert.FromBase64String(txt);
		using (var ms = new MemoryStream(data))
		{
			BinaryFormatter serializer = new BinaryFormatter();
			var obj = serializer.Deserialize(ms);
			if (obj is T)
			{
				return (T)obj;
			}
		}
		return default(T);
	}
}

XML序列化

var demo = new Demo();
demo.Number = 100;
demo.Text = "hhhhh";
Console.WriteLine(demo.ToString());
 str = SerializerHelper.XmlSerialize(demo);
Console.WriteLine(str);
var cc = SerializerHelper.XmlDeserialize<Demo>(str);
Console.WriteLine(cc.ToString());

/// <summary>
/// XML序列化
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="obj"></param>
/// <returns></returns>
public static string XmlSerialize<T>(T obj)
{
	XmlSerializer serializer = new XmlSerializer(typeof(T));
	var xmlns = new XmlSerializerNamespaces();
	xmlns.Add(string.Empty, string.Empty);
	using (var ms = new MemoryStream())
	{
		serializer.Serialize(ms, obj, xmlns);
		return Encoding.UTF8.GetString(ms.ToArray());
	}
}
/// <summary>
/// XML反序列化
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="txt"></param>
/// <returns></returns>
public static T XmlDeserialize<T>(string txt)
{
	XmlSerializer serializer = new XmlSerializer(typeof(T));
	using (var sr = new StringReader(txt))
	{
		var obj = serializer.Deserialize(sr);
		if (obj is T)
		{
			return (T)obj;
		}
	}
	return default(T);
}

JSON序列化

System.Text.Json