使用ViewModel添加模型的多个实例

本文关键字：实例 模型 ViewModel 添加 使用 | 更新日期: 2023-09-27 18:26:35

我有模型Event和Ticket

public class Event
{
    public int EventID { get; set; }
    [Required]
    public String Name { get; set; }
    [Required]
    public String Location { get; set; }
    [Required]
    [DataType(DataType.Date)]
    public DateTime Date { get; set; }
    [Required]
    [DataType(DataType.MultilineText)]
    public String Description { get; set; }
    [Required]
    public int TicketsAvailable { get; set; }
    //navigation property
    public virtual ICollection<Order> Order { get; set; }
    //navigation property
    public virtual ICollection<Ticket> Ticket { get; set; }
}
public class Ticket
{
   public int TicketID { get; set; }
   [Required]
   [ForeignKey("Event")]
   //foreign key
    public int EventID { get; set; }
   [Required]
   public string Description { get; set; }
   [Required]
   public float Price { get; set; }
    //navigation property
    public virtual Event Event { get; set; }
    //navigation property
    public ICollection<OrderDetails> OrderDetails { get; set; }
}

我创建了两个视图模型，允许我为每个活动添加多个门票

public class TicketVm
{
    [Required]
    public string Description { get; set; }
    [Required]
    public float Price { get; set; }
}
public class CreateTicketVm
{
    public int EventId { get; set; }
    public List<TicketVm> Tickets { set; get; }
}

然后我有一个视图，它允许用户创建一个新的事件。然后，当他们提交此事件时，他们被引导到CreateTicket视图，该视图应该使用与创建的事件相同的EventID向此事件添加新的票证。

这是我的创建票证视图

@model Site.Models.CreateTicketVm
<head>
<title>Create Event Tickets</title>
<link href="Content/TicketStyles.css" rel="stylesheet" type="text/css">
</head>

<h3> Tickets</h3>
<div id="tickets"></div>
@Html.HiddenFor(s => s.EventId)
<input type="button" id="add" value="Add Ticket" />
<input type="submit" id="btnSave" />
@section scripts{
<script>
$(function () {
    //Lets create the first row
    addNewRow();
    $("#add").click(function (e) {
        e.preventDefault();
        addNewRow();
    });
    $("#btnSave").click(function (e) {
        e.preventDefault();
        var createTicket = { EventId: $("#EventId").val(), Tickets: [] };
        var rows = $("#tickets").find(".item");
        $.each(rows, function (i, row) {
            var _row = $(this);
            var inputs = _row.find("input");
            var ticket = {};
            $.each(inputs, function (index, item) {
                var _this = $(this);
                ticket[_this.data("for")] = _this.val();
            });
            createTicket.Tickets.push(ticket);
        });
        var targetUrl = "@Url.Action("CreateTicket","Tickets1")";
        $.ajax({
            url: targetUrl,
            contentType: "application/json",
            data: JSON.stringify(createTicket),
            type: "POST"
        }).done(function (res) {
            if (res.Status === "Success") {
                window.location.href = "@Url.Action("Success")";
            }
        });
    });
});
function addNewRow() {
    $.get("@Url.Action("AddNewTicketRow","Tickets1")", function (res) {
        $("#tickets").append(res);
    });
}
</script>
}

这是我的AddNewTicket部分视图

@model Site.Models.TicketVm
<div class="item">
    @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
<div>
    @Html.TextBoxFor(model => model.Description, new { @data_for = "Description" })
</div>
@Html.LabelFor(model => model.Price, htmlAttributes: new { @class = "control-label col-md-2" })
<div>
    @Html.TextBoxFor(s => s.Price, new { @data_for = "Price" })
</div>
</div>

这是我的Tickets1Controller类

 public class Tickets1Controller : Controller
 {
    private ApplicationDbContext db = new ApplicationDbContext();

    public ActionResult CreateTicket(int id)
    {
        var vm = new CreateTicketVm { EventId = id };
        return View(vm);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult CreateTicket(CreateTicketVm model)
    {
        if (model != null)
        {
            foreach (var ticketVm in model.Tickets)
            {
                db.Tickets.Add(new Ticket{ EventID = model.EventId, 
                 Description=ticketVm.Description, Price =ticketVm.Price});
                db.SaveChanges();
            }
            return RedirectToAction("Index");
        }
        return RedirectToAction("Index");  
    }
    public ActionResult AddNewTicketRow()
    {
        var vm = new TicketVm();
        return    PartialView("~/Views/Tickets1/Partials/AddNewTicketRow.cshtml", vm);
    }

我的Tickets没有保存，我不明白为什么，因为EventID被传递到CreateTicket视图，但当单击Submit按钮时没有发生任何事情，并且Tickets也没有保存到我的数据库表中。任何关于如何解决这个问题的建议都将不胜感激。

使用ViewModel添加模型的多个实例

有一次我遇到了同样的问题。我所做的就是为页面定义一个jquery变量，并在每次单击"AddNewTicketRow"时增加它。然后将其作为参数发送到"AddNewTicketRow"控制器，并将其用作INDEX来创建AddNewTiket部分视图，如下所示：

@Html.TextBoxFor(M => M.Description, new { Name = "Tickets[" + @Model.Index + "].Description", id = "Tickets[" + @Model.Index + "].Description" })
@Html.TextBoxFor(M => M.Price, new { Name = "Tickets[" + @Model.Index + "].Price", id = "Tickets[" + @Model.Index + "].Price" })
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