将复杂对象从 Jquery 绑定到模型 asp net core答案

【问题标题】：Bind complex objects from Jquery to model aspnet core将复杂对象从 Jquery 绑定到模型 asp net core
【发布时间】：2019-11-11 12:38:47
【问题描述】：

使用 ASP.NET Core 2.2

我正在尝试从 JQuery 绑定一个复杂对象以将其传递给控制器。发票视图包含选定产品的 ID 及其数量，我需要将其绑定到模型属性，该属性是 SelectedProds 对象的列表。

onclick of submit button 我正在使用所选产品的 id 及其数量的字典对象设置隐藏字段的值。

剃刀视图


  <form asp-action="AddNewInvoice">

        <div class="card-body">
            <div class="row">
                <div class="col-md-12">
                    <div asp-validation-summary="ModelOnly" class="text-danger"></div>
                    <div class="form-group row">
                        <div class="col-md-3">
                            <label asp-for="CompanyId" class="control-label"></label>
                            <select asp-for="CompanyId" class="form-control" asp-items="@Model.CompanyIdList"></select>
                        </div>
                        <div class="col-md-3">
                            <label asp-for="InvoiceDate" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-calendar"></i>
                                    </span>
                                </div>
                                <input type="date" asp-for="InvoiceDate" class="form-control" />
                            </div>
                            <span asp-validation-for="InvoiceDate" class="text-danger"></span>
                        </div>
                        <div class="col-md-3">
                            <label asp-for="BuyersOrderNo" class="control-label"></label>
                            <input asp-for="BuyersOrderNo" class="form-control" />
                            <span asp-validation-for="BuyersOrderNo" class="text-danger"></span>
                        </div>
                        <div class="col-md-3">
                            <label asp-for="BuyersOrderDate" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-calendar"></i>
                                    </span>
                                </div>
                                <input type="date" asp-for="BuyersOrderDate" class="form-control" />
                            </div>
                            <span asp-validation-for="BuyersOrderDate" class="text-danger"></span>
                        </div>
                    </div>
                    <div class="form-group">
                        <div class="col-md-12">
                            <label asp-for="SelectedProducts" class="control-label"></label>
                            <select asp-for="SelectedProducts" asp-items="@Model.ProductList" class="form-control select2"></select>
                            <span asp-validation-for="SelectedProducts" class="text-danger"></span>
                           <input type="hidden" asp-for="SelectedProds" />
                        </div>
                    </div>
                    <hr />
                    <div class="form-group">
                        <div class="col-md-12" id="Items">
                            <div class="brand-card-body row text-lg-center text-uppercase">
                                <div class="col-md-2">Product Code</div>
                                <div class="col-md-5">Description</div>
                                <div class="col-md-2">Capacity in ml </div>
                                <div class="col-md-1"> Price </div>
                                <div class="col-md-1">Quantity</div>
                            </div>
                            <div class="row"></div>

                        </div>
                    </div>
                    <hr />
                    <div class="form-group row col-12">
                        <div class="col-md-3">
                            <label asp-for="TotalAmount" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-rupee"></i>
                                    </span>
                                </div>
                                <input asp-for="TotalAmount" readonly="readonly" class="form-control" />
                            </div>
                            <span asp-validation-for="TotalAmount" class="text-danger"></span>
                        </div>
                        <div class="col-md-2">
                            <label asp-for="LessDiscount" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-percent"></i>
                                    </span>
                                </div>
                                <input asp-for="LessDiscount" type="number" min="0" placeholder="Percentage" class="form-control">
                            </div>
                            <span asp-validation-for="LessDiscount" class="text-danger"></span>
                        </div>
                        <div class="col-md-2">
                            <label asp-for="DiscountedAmount" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-rupee"></i>
                                    </span>
                                </div>
                                <input asp-for="DiscountedAmount" readonly="readonly" class="form-control" />
                            </div>
                            <span asp-validation-for="DiscountedAmount" class="text-danger"></span>
                        </div>
                        <div class="col-md-2">
                            <label asp-for="TaxableValue" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-rupee"></i>
                                    </span>
                                </div>
                                <input asp-for="TaxableValue" type="number" min="0" readonly="readonly" class="form-control" />
                            </div>
                            <span asp-validation-for="TaxableValue" class="text-danger"></span>
                        </div>
                        <div class="col-md-3">
                            <label asp-for="TotalTaxAmount" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-rupee"></i>
                                    </span>
                                </div>
                                <input asp-for="TotalTaxAmount" readonly="readonly" class="form-control" />
                            </div>
                            <span asp-validation-for="TotalTaxAmount" class="text-danger"></span>
                        </div>
                    </div>
                    <div class="form-group row col-12">

                        <div class="col-md-3">
                            <label asp-for="NetPayable" class="control-label"></label>
                            <div class="input-group">
                                <div class="input-group-prepend">
                                    <span class="input-group-text">
                                        <i class="fa fa-rupee"></i>
                                    </span>
                                </div>
                                <input asp-for="NetPayable" type="number" min="0" readonly="readonly" class="form-control" />
                            </div>
                            <span asp-validation-for="NetPayable" class="text-danger"></span>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="card-footer">
            <button type="submit" class="btn btn-primary" onclick="bindList()">
                <i class="fa fa-dot-circle-o"></i> Create Invoice
            </button>
            <button type="reset" class="btn btn-danger">
                <i class="fa fa-ban"></i> Reset
            </button>
        </div>
    </form>

<script>
var itemsArray = [];

 $(document).on("keyup change", ".qtyy", function () {

            var sum = 0;

            $(".qtyy").each(function () {
                var id=  // getting id of the product
                var qty = //getting quantity;

                obj = {};
                obj.Code = id;
                obj.Quantity = qty;

                itemsArray.push(obj);
            });

//calling below function on onclick of submit
  function bindList() {

        $('#SelectedProds').val(JSON.stringify(itemsArray));
        }
</script>

控制器动作

 [HttpPost]
        public IActionResult AddNewInvoice(CreateInvoiceViewModel model)
        { . . .

视图模型

public class CreateInvoiceViewModel
    {
        [Required]
        [DisplayName("Select Company")]
        public string CompanyId { get; set; }

        public List<SelectListItem> CompanyIdList { get; set; }

        public List<SelectListItem> ProductList { get; set; }

        [DisplayName("Select Products")]
        public Dictionary<string, string> SelectedProducts { get; set; }

        public List<ProdQuantity> SelectedProds { get; set; }
        [Required]
        [DisplayName("Invoice Date")]
        public DateTime InvoiceDate { get; set; } = DateTime.Today.Date;

        [Required]
        [DisplayName("Buyer's Order #")]
        public string BuyersOrderNo { get; set; }

        [Required]
        [DisplayName("Buyer's Order Date")]
        public DateTime BuyersOrderDate { get; set; } = DateTime.Today.Date;

        public string Notes { get; set; }

        [Required]
        [DisplayName("Total Amount")]
        public string TotalAmount { get; set; }

        [DisplayName("Amount In Words")]
        public string AmountInWords { get; set; }

        [Required]
        [DisplayName("Discount Percentage")]
        public string LessDiscount { get; set; }

        [Required]
        [DisplayName("Discounted Amount")]
        public string DiscountedAmount { get; set; }

        [DisplayName("Net Payable")]
        public string NetPayable { get; set; }

        [DisplayName("Hsn Code")]
        public string HsnCode { get; set; }

        [Required]
        [DisplayName("Taxable Amount")]
        public string TaxableValue { get; set; }

        [DisplayName("Central Tax Rate")]
        public string CentralTaxRate { get; set; }

        [DisplayName("State Tax Rate")]
        public string StateTaxRate { get; set; }

        [Required]
        [DisplayName("Total Tax Amount")]
        public string TotalTaxAmount { get; set; }
    }

    public class ProdQuantity
    {
        public string Code { get; set; }
        public string Quantity { get; set; }
    }

SelectedProds 列表在 Action 中显示为空。

我们将不胜感激。

【问题讨论】：

首先，您应该使用浏览器的调试控制台 > 网络选项卡检查您发送的内容。我猜 SelectedProds 看起来不像是可以转换为 List of ProdQuantity 的东西。
我想如果你把SelectedProducts 变成List<SelectListItem>，这行得通吗？您传递的不是字典，而是数组。
@christoph 我检查了。正确设置隐藏字段值。

标签： c# jquery object asp.net-core model-binding

【解决方案1】：

第一件事是我找不到你的.qtyy 元素在哪里，所以我只是创建了测试值，例如：

@section Scripts{ 
    <script>
        var itemsArray = [];
        $(function () {

            var id = "1"
            var qty = "2"

            obj = {};
            obj.Code = id;
            obj.Quantity = qty;

            itemsArray.push(obj);

        })

        function bindList() {

            $('#SelectedProds').val(JSON.stringify(itemsArray));
        }

    </script>

}

您可以为您的 SelectedProds 属性创建自定义模型绑定器：

public class CustomModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        var value = valueProviderResult.FirstValue; // get the value as string
        var result= JsonConvert.DeserializeObject<List<ProdQuantity>>(value);    
        bindingContext.Result = ModelBindingResult.Success(result);
        return Task.CompletedTask;
    }
}

然后绑定到你的属性：

[BindProperty(BinderType = typeof(CustomModelBinder))]
public List<ProdQuantity> SelectedProds { get; set; }

结果：

【讨论】：

我有一个 JavaScript 函数，它在选择下拉列表时添加一个动态行。 qtyy 类被添加到动态生成的数量文本框中。无论如何为什么需要自定义模型绑定器？ Asp.net mvc 不需要这样的模型绑定器实现来绑定复杂的对象。
@BlushMaq ，好的，然后尝试使用我的代码并检查它是否有效
是的。我今晚试试。提前致谢。