Question

如果视图中的条件在一个视图中有两个模型，我的方法和位置有问题。

这是视图

public int PIC_ID { get; set; }
public string pic_name { get; set; }
public Nullable<int> belong_id { get; set; }
public byte[] pic { get; set; }

这是图片模型

public int SPID { get; set; }
public string Sp_email { get; set; }
public string Sp_password { get; set; }
public string Sp_name { get; set; }

这是service_provider模型

public ActionResult Index(){   
    ViewBag.service_provider = dc.service_provider;
    ViewBag.pictures = dc.pictures;
    return View();
}

这是我的控制器

{{1}}

上述视图的目的是显示service_provider的详细信息，其中图片中的 belongs_id 等于service_provider中的 SPID 。但我无法理解如果条件我在哪里添加。我正在使用数据库第一种方法

Answer 1

如果使用强类型模型而不是ViewBag，则会容易得多。然后，您可以向模型或控制器添加逻辑。我个人更容易阅读和测试。它还可以防止语法错误。

Models.cs

public class Picture {
    public int PIC_ID { get; set; }
    public string pic_name { get; set; }
    public Nullable<int> belong_id { get; set; }
    public byte[] pic { get; set; }

    // added - your FK pointing back to the corresponding service_provider
    public int SPID { get; set; }
    // added - the corresponding service_provider
    public service_provider ServiceProvider { get; set; }
}

public class service_provider {
    public int SPID { get; set; }
    public string Sp_email { get; set; }
    public string Sp_password { get; set; }
    public string Sp_name { get; set; }

    // added
    public ICollection<Picture> Pictures {get;set;}
}

Controller.cs

public ActionResult Index(){   
    var service_provider = dc.service_provider.Inculde(x => x.Pictures);
    // var pictures = dc.pictures;

    // code to add the pictures to the correct service_provider instance
    // ideally this should already be reflected in your model. 
    // If you are using EF you should be modeling this using proper data relations
    // that would allow you to execute an .Include statement on the retrieval
    // and pass the model directly into the View without the need for an additional call to pictures as the service_provider would then already contain the relations
    return View(service_provider);
}

View.cshtml

@model IEnumerable<service_provider>
@*This following line indicates that it is a list of service_provider hense the IEnumerable*@
@foreach (service_provider SP in Model){
    <tr>
        <td>@SP.Sp_email</td>
        <td>@SP.Sp_name</td>
        <td>@SP.city.Cityname</td>
    </tr>
    @*Iterate over the pictures on each model. 
    You can still split this if you want all service providers and then all pictures.*@
    @foreach (picture img in SP.Pictures){ @*changed to still look at the model*@
        <tr><td><img src="data:image/png;base64,@Convert.ToBase64String(img.pic,0,img.pic.Length)" width="100" /></td></tr>
    }
}

Answer 2

尝试：

@foreach (picture img in ViewBag.pictures)
{
     if(img.PIC_ID == ViewBag.service_provider.SPID)
{
<tr><td><img src="data:image/png;base64,@Convert.ToBase64String(img.pic,0,img.pic.Length)" width="100" /></td></tr>
}
}

BTW - 也许更好的方法 - 检查服务器端并返回你需要的图片吗？

具有if条件的单个视图中的2个模型

2 个答案: