在過去的幾天里，我一直在網上尋找，但仍然無法得到我想要的。也許是我的研究方式是錯誤的。但這是我有一個訂單模型的問題
public class Order
{
[Key]
public int Id { get; set; }
public int TotalItems { get; set; }
public DateTime DeliveryDate { get; set; }
public string OrderNumber { get; set; }
public string DeliveryAddress { get; set; }
[ForeignKey("ClientId")]
public int ClientId { get; set; }
public int OrderItemId { get; set; }
[ForeignKey("OrderItemId")]
public List<OrderItem> OrderItems { get; set; }
public Client Client { get; set; }
}
還有一個 OrderItem 模型
public class OrderItem
{
public int Id { get; set; }
[ForeignKey("OrderId")]
public int OrderId{ get; set; }
public int InventoryInfoId { get; set; }
[ForeignKey("InventoryInfoId")]
[Required]
public string ItemCode { get; set; }
public int Quantity { get; set; }
public virtual InventoryInfo InventoryInfo { get; set; }
public Order Order { get; set; }
}
根據用戶輸入，一個訂單可以有多個訂單項。這是我的 OrderViewModel
public class OrderViewModel
{
//public int OrderId { get; set; }
//public string OrderNumber { get; set; }
//public string DeliveryAddress { get; set; }
//public int ClientId { get; set; }
//public DateTime Deliverydate { get; set; }
public Order Order { get; set; }
public IList<OrderItem> OrderItems { get; set; }
public int ItemCode { get; set; }
public int Quantity { get; set; }
}
這是我的 Create.cshtml
<div class="row">
<div class="col-md-4">
<form asp-action="Create">
<div asp-validation-summary="All" class="text-danger"></div>
<div class="form-group">
<label asp-for="Order.ClientId" class="control-label"></label>
<select asp-for="Order.ClientId" class="form-control" asp-items="ViewBag.ClientId">
<option>-- Select Client --</option>
</select>
<span asp-validation-for="Order.ClientId" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Order.OrderNumber" class="control-label"></label>
<input asp-for="Order.OrderNumber" class="form-control" />
<span asp-validation-for="Order.OrderNumber" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Order.DeliveryDate" class="control-label"></label>
<input type="date" data-val="true" asp-for="Order.DeliveryDate" class="form-control" />
<span asp-validation-for="Order.DeliveryDate" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Order.DeliveryAddress" class="control-label"></label>
<input asp-for="Order.DeliveryAddress" class="form-control" />
<span asp-validation-for="Order.DeliveryAddress" class="text-danger"></span>
</div>
<table id="tblCustomers" class="table" cellpadding="0" cellspacing="0">
<thead>
<tr>
<th style="width:150px">Item Code</th>
<th style="width:150px">Quantity</th>
<th></th>
</tr>
</thead>
<tbody></tbody>
<tfoot id="item-list">
<tr>
<td>
<select asp-for="OrderItems[0].ItemCode" class="items" asp-items="@ViewBag.Item"></select>
</td>
<td><input type="text" asp-for="OrderItems[0].Quantity" class="items" /></td>
@*<td><input type="button" id="btnAdd" value="Add" /></td>*@
</tr>
</tfoot>
</table>
<button id="add">Add another item</button>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</form>
</div>
</div>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
<script>
$("#add").click(function (e) {
e.preventDefault();
var i = ($(".items").length) / 2;
var model = @Html.Raw(@ViewBag.Items);
var n = '<tr><td><select id="OrderItems_' 1 '_ItemCode" name="OrderItems[' 1 '].ItemCode" /></td>'
'<td><input type="text" name="OrderItems[' 1 '].Quantity" /></td></tr>'
$("#item-list").append(n);
var Items = "";
$(model).each(function (e) {
Items = Items '<option value="' this.Value '">' this.Text '</option>'
});
var subItemList = $("#OrderItems" 1 "_ItemCode");
subItemList.empty();
subItemList.append(Items);
});
</script>
}
用戶有兩個部分，訂單詳細資訊和訂單專案這是我的 OrdersController 創建
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("ClientId", "OrderNumber", "DeliveryDate", "DeliveryAddress")]OrderViewModel OrderVM)
{
try
{
if (ModelState.IsValid)
{
var order = new Order()
{
Id = OrderVM.OrderId,
DeliveryAddress = OrderVM.DeliveryAddress,
DeliveryDate = OrderVM.Deliverydate,
OrderNumber = OrderVM.OrderNumber
};
_context.Add(order);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
}
catch (DbUpdateException ex)
{
//Log the error(uncomment ex variable name and write a log.
ModelState.AddModelError("", "Unable to save changes. "
"Try again, and if the problem persists "
"see your system administrator.");
}
PopulateClientDropDownList(OrderVM.ClientId);
CreateMultipleOrderItem();
return View(OrderVM);
}
我現在真的很迷茫，因為我已經嘗試了幾個教程并查看了示例，但似乎沒有什么可以幫助我解決這個問題。也許我無法理解他們。請幫幫我！
在杰弗里的幫助下。
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(OrderViewModel OrderVM)
{
try
{
if (ModelState.IsValid)
{
//var order = new Order()
//{
// Id = OrderVM.OrderId,
// DeliveryAddress = OrderVM.DeliveryAddress,
// DeliveryDate = OrderVM.Deliverydate,
// OrderNumber = OrderVM.OrderNumber
//};
_context.AddRange(OrderVM);
//_context.AddRange(OrderVM.OrderItems);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
}
catch (DbUpdateException ex)
{
//Log the error(uncomment ex variable name and write a log.
ModelState.AddModelError("", "Unable to save changes. "
"Try again, and if the problem persists "
"see your system administrator.");
}
PopulateClientDropDownList(OrderVM.Order.ClientId);
CreateMultipleOrderItem();
return View(OrderVM);
}
The edited version of the controller allows the data to pass from my view page to the controller. However there's an error.InvalidOperationException: The entity type 'OrderViewModel' was not found. Ensure that the entity type has been added to the model. Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.GetOrCreateEntry(object entity)
uj5u.com熱心網友回復：
嘗試這樣的事情
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(OrderViewModel OrderVM)
{
try
{
if (ModelState.IsValid)
{
var order = new Order()
{
// Id = OrderVM.OrderId,- Primary keys will be auto generated
DeliveryAddress = OrderVM.DeliveryAddress,
DeliveryDate = OrderVM.Deliverydate,
OrderNumber = OrderVM.OrderNumber,
ClientId = OrderVM.ClientId,
TotalItems = OrderVM.TotalItems,
OrderItems = OrderVM.Select(item => new OrderItem()
{
ItemCode = item.ItemCode,
Quantity = item.Quantity,
InventoryInfoId = item.InventoryInfoId
}).ToList()
};
await _context.Orders.AddAsync(order);
//_context.AddRange(OrderVM.OrderItems);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
}
catch (DbUpdateException ex)
{
//Log the error(uncomment ex variable name and write a log.
ModelState.AddModelError("", "Unable to save changes. "
"Try again, and if the problem persists "
"see your system administrator.");
}
PopulateClientDropDownList(OrderVM.Order.ClientId);
CreateMultipleOrderItem();
return View(OrderVM);
}
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