using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Linq;  
using System.Text;  
using System.Windows.Forms;  
  
using System.IO;  
  
using MongoDB;  
using MongoDB.GridFS;  
  
namespace mongotest  
{  
    public partial class Form2 : Form  
    {  
        public Form2()  
        {  
            InitializeComponent();  
            Init();  
        }  
        private void btnGridFSSave_Click(object sender, EventArgs e)  
        {  
            byte[] byteImg = File.ReadAllBytes(@"c:\temp\yl.jpg");  
            filename = GridFsSave(byteImg);  
            MessageBox.Show(filename);  
        }  
        private void btnGridFSShow_Click(object sender, EventArgs e)  
        {  
            byte[] buff = GridFsRead(filename);  
            MemoryStream MS = new MemoryStream(buff);  
            pictureBox1.Image = Image.FromStream(MS);  
        }  
        private Mongo mongo;  
        private IMongoDatabase test;  
        string filename;  
        void Init()  
        {  
            var connstr = @"Server=localhost:27017";  
            mongo = new Mongo(connstr);  
            mongo.Connect();  
            test = mongo["test"];  
        }  
        private string GridFsSave(byte[] byteFile)  
        {  
            string filename = Guid.NewGuid().ToString();  
  
            //这里GridFile构造函数有个重载，bucket参数就是用来替换那个创建集合名中默认的"fs"的。  
            GridFile gridFile = new GridFile(test);  
            using (GridFileStream gridFileStream = gridFile.Create(filename))  
            {  
                gridFileStream.Write(byteFile, 0, byteFile.Length);  
            }  
            return filename;  
        }  
        private byte[] GridFsRead(string filename)  
        {  
            GridFile gridFile = new GridFile(test);  
            GridFileStream gridFileStream = gridFile.OpenRead(filename);  
            byte[] bytes = new byte[gridFileStream.Length];  
            gridFileStream.Read(bytes, 0, bytes.Length);  
            return bytes;  
        }  
    }  
}