如何将一个类的对象保存到文件并重新加载它. [英] How to save object of a class to a file and reload it...........

问题描述

如何将类的对象保存到文件中.
像--->

classname obj = new classname();

然后如何将obj保存到文件中以备将来使用.

How to save object of a class to a file.
like --->

classname obj=new classname();

then how to save obj to a file for future use.

and then how to read data back from file in object.

推荐答案

可以使用Serializeand Deserialize概念解决问题.
看到这1st你应该有命名空间

U r problem can be solver using Serializeand Deserialize concept
see this 1st u should have namespaces

using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

然后创建一个类

then create a class

[Serializable]
    class Class1
    {
        public string name;
        public string ID;
        public string address;
    }

可序列化是我们需要使用的关键词

然后在主程序中编写此代码

BinaryFormatter bnf = new BinaryFormatter();
MemoryStream ms =新的MemoryStream();

Class1 obj =新的Class1();
obj.name =阿伦";
obj.ID ="007";
obj.address ="Mysore";

bnf.Serialize(ms，obj);
byte [] obj_content = ms.ToArray();

//File.Create("C:\\arun.arv);
//File.WriteAllBytes("C:\\arun.arv，obj_content);
FileStream fs1 = new FileStream("C:\\ arun.arv"，FileMode.Create);
BinaryWriter写入=新的BinaryWriter(fs1);
write.Write(obj_content);
write.Close();
fs1.Close();

FileStream fs = new FileStream("C:\\ arun.arv"，FileMode.Open);
BinaryReader read = new BinaryReader(fs);
byte [] obj_converter =新的byte [fs.Length];
read.Read(obj_converter，0，obj_converter.Length);



MemoryStream ms1 =新的MemoryStream(obj_converter);
BinaryFormatter bnf1 =新的BinaryFormatter();
ms1.Position = 0;

Class1 obj2 =(Class1)bnf1.Deserialize(ms1);
Console.Write(obj2.name);
Console.Write(obj2.ID);
Console.Write(obj2.address);

Serializable is a key word we need to use it

then in main program write this code

BinaryFormatter bnf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();

Class1 obj = new Class1();
obj.name = "Arun";
obj.ID = "007";
obj.address="Mysore";

bnf.Serialize(ms, obj);
byte[] obj_content = ms.ToArray();

//File.Create("C:\\arun.arv");
//File.WriteAllBytes("C:\\arun.arv", obj_content);
FileStream fs1 = new FileStream("C:\\arun.arv", FileMode.Create);
BinaryWriter write = new BinaryWriter(fs1);
write.Write(obj_content);
write.Close();
fs1.Close();

FileStream fs = new FileStream("C:\\arun.arv",FileMode.Open);
BinaryReader read=new BinaryReader (fs);
byte[] obj_converter = new byte[fs.Length];
read.Read(obj_converter, 0, obj_converter.Length);



MemoryStream ms1 = new MemoryStream(obj_converter);
BinaryFormatter bnf1 = new BinaryFormatter();
ms1.Position = 0;

Class1 obj2 = (Class1)bnf1.Deserialize(ms1);
Console.Write(obj2.name);
Console.Write(obj2.ID);
Console.Write(obj2.address);

如果要序列化的类未标记为[Serializable]，则可以使用

If the class you want to serialize isn''t marked with [Serializable], you can use XmlSerializer.

尝试

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