Mongodb C#客户端数据关联数据，使用Linq语法进行关联

在Mongodb C# drivers 文档

官方地址：https://docs.mongodb.com/ecosystem/drivers/csharp/

基础的使用请参考《c# Mongodb》

原本在Nodejs中是可以直接某个字段参考自另一个表的，数据类型是ObjectID，只需要加入ref:'某个实体'即可实现

'use strict';
import mongoose from './db';

let Schema = mongoose.Schema;

let jobOrderSchema = new Schema({
    JobOrderCode: {
        type: String,
        unique: true,
        trim: true,
        required: [true, 'Kindly enter the jobOrder code']
    },
    JobOrderName: {
        type: String,
        trim: true,
        required: [true, 'Kindly enter the jobOrder name']
    },
    JobOrderDesc: {
        type: String,
        trim: true,
        required: [true, 'Kindly enter the jobOrder description']
    },
    OrderCount: {
        type: Number,
        required: [true, 'Kindly enter the order count']
    },
    CustomerID: {
        type: Schema.Types.ObjectId,
        ref: 'Customer'
    },
    MaterialID: {
        type: Schema.Types.ObjectId,
        ref: 'Material'
    },
    MouldID: {
        type: Schema.Types.ObjectId,
        ref: 'Mould'
    },
    MachineID:{
        type: Schema.Types.ObjectId,
        ref: 'Machine'
    },
    MachineAcceptLog:[{
        type: String,
        trim: true
    }],
    Remark: {
        type: String,
        trim: true
    },
    CreateAt: {
        type: Date,
        default: Date.now
    },
    CreateBy: {
        type: String
    },
    LastUpdateAt: {
        type: Date,
        default: Date.now
    },
    LastUpdateBy: {
        type: String
    },
});

jobOrderSchema.set('collection', 'JobOrder');
const jobOrderModel = mongoose.model('JobOrder', jobOrderSchema);

export default jobOrderModel;

但在C#中，暂时还没有找到ref类型的处理方式，

找到部分资料，但还没有悟透方法 

参考地址：https://csharp.hotexamples.com/examples/MongoDB.Driver/MongoDBRef/-/php-mongodbref-class-examples.html

参考地址：https://oz-code.com/blog/how-to-mongodb-in-c-part-1/ 

使用Linq语法参考https://jira.mongodb.org/browse/CSHARP-1627 

在没有找到相关的方法时，先使用以下代码代替，即使用Linq的语法进行处理

        /// <summary>
        /// 获取所有未开始的订单
        /// </summary>
        /// <returns></returns>
        public static object GetJobOrderByNoStart()
        {
            try
            {
                var customerCollection = Common.MongodbHandler.GetInstance().mc_MongoDatabase.GetCollection<DataModel.Customer>(Common.ConfigFileHandler.GetAppConfig("CustomerCollectionName"));
                var materialCollection = Common.MongodbHandler.GetInstance().mc_MongoDatabase.GetCollection<DataModel.Material>(Common.ConfigFileHandler.GetAppConfig("MaterialCollectionName"));
                var mouldCollection = Common.MongodbHandler.GetInstance().mc_MongoDatabase.GetCollection<DataModel.Mould>(Common.ConfigFileHandler.GetAppConfig("MouldCollectionName"));
                var jobOrderCollection = Common.MongodbHandler.GetInstance().mc_MongoDatabase.GetCollection<DataModel.JobOrder>(Common.ConfigFileHandler.GetAppConfig("JobOrderCollectionName"));

                var getdocument = (from jo in jobOrderCollection.AsQueryable()
                                   join cu in customerCollection.AsQueryable() on jo.CustomerID equals cu._id
                                   join ma in materialCollection.AsQueryable() on jo.MaterialID equals ma._id
                                   join mo in mouldCollection.AsQueryable() on jo.MouldID equals mo._id
                                   where jo.Status == null
                                   select new
                                   {
                                       JobOrderCode = jo.JobOrderCode,
                                       JobOrderName = jo.JobOrderName,
                                       OrderCount = jo.OrderCount,
                                       JobOrderDesc = jo.JobOrderDesc,
                                       Status =
                                       (
                                            jo.Status == null ? "未开始" :
                                            jo.Status == "Process" ? "生产中" :
                                            jo.Status == "Stop" ? "暂停" : "未知状态"
                                        ),

                                       CustomerCode = cu.CustomerCode,
                                       CustomerName = cu.CustomerName,

                                       MaterialCode = ma.MaterialCode,
                                       MaterialName = ma.MaterialName,
                                       MaterialSpecification = ma.MaterialSpecification,
                                       
                                       MouldCode = mo.MouldCode,
                                       MouldName = mo.MouldName,
                                       MouldSpecification = mo.MouldSpecification,
                                   }
                                ).ToList();


                return getdocument;
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }