c#Mongodb 操作

1. 从官网上下载 Mongodb 4.0 https://www.mongodb.com/download-center?jmp=nav#community, 安装时注册其中一步左下不要选中否则会加装很慢,这个很多人会碰到. 安装完以后,直接在服务的生成服务。

2.c# 的操作库在这里:https://docs.mongodb.com/ecosystem/drivers/csharp/ (.net 4.5版)以上

3. 操作工具 Robo 3T 可从官方网上直接下载

4.增加一个数据库这个可用命令,可用直接用工具完成

5.增加一个文件:

public byte[] ConvertToBytes(Image img)
{

System.IO.MemoryStream ms = new System.IO.MemoryStream();
Bitmap bmp = new Bitmap(img);//克隆Bitmap对象
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] bytes = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(bytes, 0, Convert.ToInt32(ms.Length));
ms.Close();
bmp.Dispose();
return bytes;

}

var client = new MongoClient("mongodb://localhost");
var database = client.GetDatabase("TestDb");
var fs = new GridFSBucket(database);
fs.UploadFromBytes("201807170002.jpg", ConvertToBytes(this.pictureEdit1.Image));

6.修改记录

var client = new MongoClient("mongodb://localhost");
var database = client.GetDatabase("TestDb");
var fs = new GridFSBucket(database);

var t = fs.DownloadAsBytesByNameAsync("201807170002.jpg");
Task.WaitAll(t);
var bytes = t.Result;
Image img1 = null;
MemoryStream stream = new MemoryStream(bytes);
img1 = Image.FromStream(stream);
this.pictureEdit2.Image = (Image)img1.Clone();
stream.Close();

7.删除记录

var client = new MongoClient(MyWBDataContext.set.ImageServer);
var database = client.GetDatabase(MyWBDataContext.set.ImageDB);
var fs = new GridFSBucket(database);
ObjectId imageID;

imageID = new ObjectId(var.Take(1).SingleOrDefault().ObjectID);
fs.Delete(imageID);

8.上传一个文件

OpenFileDialog fdlg = new OpenFileDialog();
fdlg.Title = "C# Corner Open File Dialog";
fdlg.InitialDirectory = @"c:\"; //@是取消转义字符的意思
fdlg.Filter = "All files（*.*）|*.*|All files(*.*)|*.* ";
/*
* FilterIndex 属性用于选择了何种文件类型,缺省设置为0,系统取Filter属性设置第一项
* ,相当于FilterIndex 属性设置为1.如果你编了3个文件类型，当FilterIndex ＝2时是指第2个.
*/
fdlg.FilterIndex = 2;
/*
*如果值为false，那么下一次选择文件的初始目录是上一次你选择的那个目录，
*不固定；如果值为true，每次打开这个对话框初始目录不随你的选择而改变，是固定的
*/
fdlg.RestoreDirectory = true;

try
{
if (fdlg.ShowDialog() == DialogResult.OK)
{
textBox1.Text = System.IO.Path.GetFileNameWithoutExtension(fdlg.FileName);

var client = new MongoClient("mongodb://localhost");
var database = client.GetDatabase("DOCDB");
var fs = new GridFSBucket(database);
using (FileStream fsRead = new FileStream(fdlg.FileName, FileMode.Open))
{

fs.UploadFromStream("飞1", fsRead);
}
}
}
catch (Exception ex) {
MessageBox.Show(ex.ToString());
}
9.下载文件

SaveFileDialog sfd=new SaveFileDialog();
sfd.Filter = "文本文件(*.txt)|*.txt|所有文件|*.*";//设置文件类型
sfd.FileName = "保存";//设置默认文件名
sfd.DefaultExt = "txt";//设置默认格式（可以不设）
sfd.AddExtension = true;//设置自动在文件名中添加扩展名
if (sfd.ShowDialog()==DialogResult.OK)
{

try
{
var client = new MongoClient("mongodb://localhost");
var database = client.GetDatabase("DOCDB");
var fs = new GridFSBucket(database);

using (FileStream fsWrite = new FileStream(@"e:\tesdffdf.doc", FileMode.CreateNew))
{

//fs.DownloadToStreamByName("飞1", fsWrite);
BsonValue v = new ObjectId("5b4d9b5afea13b059440da07");
fs.DownloadToStream(v, fsWrite);

}
}
catch (Exception ex) {
MessageBox.Show(ex.ToString());
}
}

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