Question

假设我有一个双重类型的属性

[Display(Name = "Retail")]
public double Price { get; set; }

在视图中

@Html.EditorFor(model => model.Price, new { htmlAttributes = new { @class = "form-control",@type="number",@min=0 } })

现在，如果用户没有输入任何内容或删除此textbox中的值.null将在提交时传递给控制器。

无论如何自动为其赋值为0而不向默认情况下双/ int / long数字段的每个字段写入手动javascript？

我的模特

public partial class Product
{
}
public class ProductsAttribute
{
    [Display(Name = "Retail")]
    [Range(0, double.MaxValue)]
    public double Price{ get; set; }     
}

数据库首次生成类`

public partial class Product
{           
   public Product()
   {              
      this.Machines = new HashSet<Machine>();
   }

   public double Price { get; set; }

   public virtual ICollection<Machine> WMFMachines { get; set; }
}

Answer 1

您可以对服务器端验证使用required属性和模型验证来控制用户是否在输入中放入空值。您还可以使用客户端验证并在表单提交之前检查输入元素。

我已将NetFiddle作品here添加到服务器和客户端验证

客户端参考：https://www.codeproject.com/Articles/718004/ASP-NET-MVC-Client-Side-Validation

//型号

public class YourModel
{

   [Required(ErrorMessage = "Price is required")]
   [Display(Name = "Retail")]
   [Range(0, double.MaxValue)]
   public double Price { get; set; }

}

//控制器

[HttpGet]
public ActionResult Index()
{
    return View(new YourModel());
}


[HttpPost]
public ActionResult Index( YourModel model)
{               
    if(ModelState.IsValid)
    {
        //model is valid, add your code here 
    }
    else
    {
        //returns with model validation error
        return View();
    }

}

// html

@using (Html.BeginForm()) {
      .......
}
@section Scripts 
{
    Scripts.Render("~/bundles/jqueryval")
}

// web.config

<configuration>
 <appSettings>  
   <add key="ClientValidationEnabled" value="true" />
   <add key="UnobtrusiveJavaScriptEnabled" value="true" />
 </appSettings>
</configuration>

Answer 2

在构造函数中设置它

public class ViewModel
{
   public ViewModel()
   { 
       this.Price = 0;
   }

   [Display(Name = "Retail")]
   public double Price { get; set; }    
}

服务器端和客户端的双输入字段的模型验证

2 个答案: