Question

我正在使用asp.net核心实体框架。我试图将我的查询结果打印到我的HTML中。这是我的代码。

这是我的.cs文件

ViewBag.User_Has_Products = (from user_products in _context.Users_Has_Products
                             join user in _context.Users on user_products.users_id equals user.id 
                             join product in _context.Products on user_products.products_id equals product.id 
                             select new { name =  user.name, product = product.name, 
                                          quantity = user_products.quanitity, date = user_products.created_at});

foreach(var item in ViewBag.User_Has_Products)
{
     System.Console.WriteLine($"{item.name}"); //this output is correct
}

这是我的.cshtml页面

@{
    if(ViewBag.User_Has_Products != null)
    {
        foreach(var item in ViewBag.User_Has_Products)
        {
            <p>@$"{item.name}"</p> //trying to print it out here
        }
    }
}

我也试过<p>@item.name</p>但是得到一个对象不包含名称错误的定义。

Answer 1

您不需要.cshtml文件中的字符串引号，只需按原样使用它，请参阅以下示例：

@{
    if(ViewBag.User_Has_Products != null)
    {
        foreach(var item in ViewBag.User_Has_Products)
        {
            <p>@item.name</p>
        }
    }
}

但更好的建议是建立model并将其发送到view，如下所示：

public class UserProductsViewmodel() {
     public string Name { get; set; }
     public string Product { get; set; }
     public int Quantity { get; set; }
     public string Date { get; set;}
}

并在.cs文件中使用它，如下所示：

ViewBag.User_Has_Products = (from user_products in _context.Users_Has_Products
                             join user in _context.Users on user_products.users_id equals user.id 
                             join product in _context.Products on user_products.products_id equals product.id 
                             select new UserProductsViewmodel() { 
                                  Name =  user.name, Product = product.name, 
                                  Quantity = user_products.quanitity, Date = user_products.created_at
                              });

在你的.cshtml中这样：

@{
    if(ViewBag.User_Has_Products != null)
    {
        foreach(UserProductsViewmodel item in ViewBag.User_Has_Products)
        {
            <p>@item.Name</p>
        }
    }
}

Answer 2

在Dependency injection into views上查看这篇文章，这比使用ViewBag更好。

控制器操作代码段

public IActionResult GetProducts()
{

    var products = (from user_products in _context.Users_Has_Products
                         join user in _context.Users on user_products.users_id equals user.id 
                         join product in _context.Products on user_products.products_id equals product.id 
                         select new UserProductsViewmodel() { 
                              Name =  user.name, Product = product.name, 
                              Quantity = user_products.quanitity, Date = user_products.created_at
                          });
    return View(products);
}

查看摘录（.cshtml）

@model IEnumerable<namespace.ProductModel>
...

@foreach (var item in Model)
{
    <p>@item.Bar</p>
}

视图模型

public class ProductModel() {
     public string Name { get; set; }
     public string Product { get; set; }
     public int Quantity { get; set; }
     public string Date { get; set;}
}

从hq

2 个答案: