从SQL中的多个表填充ViewModel

Question

我试图创建一个查询AdventureWorks2012数据库的SPA，并使用Jquery ui datepicker基于日期时间范围填充强类型表。

我遇到的问题是它返回所有相同的重复记录。

Duplicate Records

感谢您的帮助！

_layout查看代码：

<div> 
    <h2>Pick a date range:</h2> 
    <form action='@Url.Action("GetOrders","Home")' method="post"> 
    <label for="from">From</label> 
    <input type="text" id="from" name="startDate"> 
    <label for="to">To</label> 
    <input type="text" id="to" name="endDate"> 
    <input type='submit' value='Set Range' /> 
    </form> 
</div> 

$(function() { 
var dateFormat = "mm/dd/yy", 
    from = $("#from") 
    .datepicker({ 
     defaultDate: "+1w", 
     changeMonth: true, 
     numberOfMonths: 3 
    }) 
    .on("change", function() { 
     to.datepicker("option", "minDate", getDate(this)); 
    }), 
    to = $("#to").datepicker({ 
    defaultDate: "+1w", 
    changeMonth: true, 
    numberOfMonths: 3 
    }) 
    .on("change", function() { 
    from.datepicker("option", "maxDate", getDate(this)); 
    }); 

function getDate(element) { 
    var date; 
    try { 
    date = $.datepicker.parseDate(dateFormat, element.value); 
    } catch(error) { 
    date = null; 
    } 

    return date; 
}}); 

GetOrders.cshtml代码：

@model System.Collections.Generic.List<ApexAssignment.ViewModels.OrderViewModel> 
@foreach (var item in Model) 
{ 
    <tr> 
     <td class="tg-yw4l"> 
      @item.Store 
     </td> 
     <td class="tg-yw4l"> 
      @item.Customer 
     </td> 
     <td class="tg-yw4l"> 
      @item.AccountNumber 
     </td> 
     <td class="tg-yw4l"> 
      @item.InvoiceNumber 
     </td> 
     <td class="tg-yw4l"> 
      @item.CustomerPO 
     </td> 
     <td class="tg-yw4l"> 
      @item.OrderDate 
     </td> 
     <td class="tg-yw4l"> 
      @item.DueDate 
     </td> 
     <td class="tg-yw4l"> 
      @item.InvoiceTotal 
     </td> 
     <td class="tg-yw4l"> 
      @item.ProductNumber 
     </td> 
     <td class="tg-yw4l"> 
      @item.Quantity 
     </td> 
     <td class="tg-yw4l"> 
      @item.UnitNet 
     </td> 
</tr> 
} 

控制器方法代码：

[HttpPost] 
    public ActionResult GetOrders(DateTime startDate, DateTime endDate) 
    { 
     var model = (from p in db.People 
        from pd in db.Products 
        from so in db.SalesOrderDetails 
        from sh in db.SalesOrderHeaders 
        where sh.OrderDate > startDate && sh.OrderDate < endDate 
        from s in db.Stores 
        from c in db.Customers 
        select new OrderViewModel() 
        { 
         AccountNumber = sh.AccountNumber, 
         Customer = p.FirstName + " " + p.LastName, 
         Store = s.Name, 
         ProductNumber = pd.ProductNumber, 
         DueDate = sh.DueDate, 
         CustomerPO = sh.PurchaseOrderNumber, 
         Quantity = so.OrderQty, 
         InvoiceNumber = sh.SalesOrderNumber, 
         UnitNet = so.UnitPrice, 
         InvoiceTotal = sh.TotalDue, 
         OrderDate = sh.OrderDate 
        }); 

     return View(model.ToList()); 
    } 

Answer 1

var model = db.SalesOrderDetails 
    .Where(e => e.SalesOrderHeader.OrderDate > startDate) 
    .Where(e => e.SalesOrderHeader.OrderDate < endDate) 
    .Join(db.Products, order => order.ProductID, 
     product => product.ProductID, (order, product) => new 
     { 
      Quantity = order.OrderQty, 
      UnitNet = order.UnitPrice, 
      DueDate = order.SalesOrderHeader.DueDate, 
      CustomerPO = order.SalesOrderHeader.PurchaseOrderNumber, 
      InvoiceNumber = order.SalesOrderHeader.SalesOrderNumber, 
      InvoiceTotal = order.SalesOrderHeader.TotalDue, 
      OrderDate = order.SalesOrderHeader.OrderDate, 
      AccountNumber = order.SalesOrderHeader.AccountNumber, 
      Store = order.SalesOrderHeader.Customer.Store.Name, 
      Customer = order.SalesOrderHeader.Customer.Person.FirstName + " " + 
         order.SalesOrderHeader.Customer.Person.LastName, 
      ProductNumber = product.ProductNumber 
     }).ToList();