在 asp.net mvc 中编辑视图

Edit view in asp.net mvc

我有 table 调用 AB_Product_vs_Field table 我有以下列

一旦我通过 Product_IDField_ID 我想在 table 中找到相关记录并加载相关 Field_Value.

为此我写了下面的代码

    [HttpGet]
    public ActionResult Edit(string Product_ID , string Field_ID)
    {
        if ((db.AB_Product_vs_Field.Any(u => u.Product_ID == Product_ID))&(db.AB_Product_vs_Field.Any(u => u.Field_ID == FieldID)))
        {           
            var product_values = new ProductEdit
            {
                ListProductFields = db.AB_Product_vs_Field.Where(p => p.Field_ID == FieldID).ToList(),
                ListProductLables = db.AB_ProductTypeCategoryField.Where(p => p.ProductFieldID == FieldID).ToList(),
                Pager = pager
            };

        return View(product_values);           

        }

    }

这是ProductEdit型号class

    public class ProductEdit
    {
        public string Product_ID { get; set; }
        public string Field_ID { get; set; }
        public IList<AB_Product_vs_Field> ListProductFields { get; set; }
        public IList<AB_ProductTypeCategoryField> ListProductLables { get; set; }    

        public IEnumerable<string> Items { get; set; }
        public PaginationModel.Pager Pager { get; set; }


        public int PageSize { get; set; }
        public int PageCount { get; set; }
        public int CurrentPageIndex { get; set; }

    }

这些是相关模型 classes

public partial class AB_ProductTypeCategoryField
{
    public string ProductFieldID { get; set; }
    public string ProductFieldNameEn { get; set; }        
}

public partial class AB_Product_vs_Field
{
    public string Product_ID { get; set; }
    public string Field_ID { get; set; }
    public string Field_Value { get; set; }               
}

这是编辑视图的视图

@model albaraka.Models.ProductEdit

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal"> 
        @Html.ValidationSummary(true, "", new { @class = "text-danger" }) 
        @for (int i = 0; i < Model.ListProductFields.Count; i++)
        {
            <div class="form-group">
                @Html.LabelFor(x => x.ListProductLables[i].ProductFieldNameEn, Model.ListProductLables[i].ProductFieldNameEn, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.HiddenFor(m => m.ListProductFields[i].Field_ID)
                    @Html.TextAreaFor(m => m.ListProductFields[i].Field_Value, new { @class = "form-control", @row = 5 })                  
                </div>
            </div>        

            <div class="form-group">
                <div class="col-md-offset-2 col-md-10">
                    <input type="submit" value="Save Details" class="btn btn-success" />
                </div>
            </div>

        }
    </div>
}

然后我遇到了流动错误

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

我的方法有什么问题,如何正确加载?

您需要将“&”运算符更改为“&&”运算符:

  if ((db.AB_Product_vs_Field.Any(u => u.Product_ID == Product_ID))&&(db.AB_Product_vs_Field.Any(u => u.Field_ID == FieldID)))

此外,在视图中您引用了错误的数组:

更改:

   @Html.LabelFor(x => x.ListProductLables[i].ProductFieldNameEn, Model.ListProductLables[i].ProductFieldNameEn, htmlAttributes: new { @class = "control-label col-md-2" })

至:

   @Html.LabelFor(x => x.ListProductFields[i].ProductFieldNameEn, Model.ListProductFields[i].ProductFieldNameEn, htmlAttributes: new { @class = "control-label col-md-2" })

最可能的原因:

@for (int i = 0; i < Model.ListProductFields.Count; i++)
        {
            <div class="form-group">
                @Html.LabelFor(x => x.ListProductLables[i].ProductFieldNameEn, Model.ListProductLables[i].ProductFieldNameEn, htmlAttributes: new { @class = "control-label col-md-2" })

这里你假设在 for 循环条件下 ListProductFields.Count 将是 =ProductFieldNameEn.Count 但它们似乎不相等。

您的循环正在递增 ListProductFields 集合,但在您的内部有

@Html.LabelFor(x => x.ListProductLables[i].ProductFieldNameEn....

我想应该是

@Html.LabelFor(x => x.ListProductFields[i].someProperty

如果 ListProductLables 不包含与 ListProductLables 完全相同数量的元素,您将获得异常