MVC3 Razor: how to check if model is empty

Question

I have tried using !Model.Any() it doesn't work, since model has no extension Any. How to solve? Here is my code snippet.

    @model MyModel.Work
    @if ( !Model.Any() )
    {
       <script type="text/javascript">
             alert("Model empty");
       </script>
    }
    else
    {
       <script type="text/javascript">
              alert("Model exists");
       </script>
    }

Answer 1

听起来像你在实例化模型,但想检查并查看它是否已填充.

我这样做的标准方法是创建一个bool名为的属性Empty,只给出一个get,然后返回你需要查看的检查,看看是否没有设置其他属性.

假设您有一个Customer类作为您的模型:

public class Customer
{
    public int CustomerId {get;set;}
    public string FirstName {get;set;}
    public string LastName {get;set;}
    public string Email {get;set;}

    public bool Empty
    {
        get { return (CustomerId == 0 && 
                      string.IsNullOrWhiteSpace(FirstName) &&
                      string.IsNullOrWhiteSpace(LastName) &&
                      string.IsNullOrWhiteSpace(Email));         
            }
    }
}

现在在您的模型中,您只需致电:

@model MyModel.Work
@if (Model.Empty)
{
   <script type="text/javascript">
         alert("Model empty");
   </script>
}
else
{
   <script type="text/javascript">
          alert("Model exists");
   </script>
}

Answer 2

你可以试试这个:

@if (Model.Count == 0)
{

}

Answer 3

这个怎么样:

if(Model == null)
{
}

Answer 4

@if(!Model.Any()){}当您传递数据列表作为模型时有效。如果您试图检查模型是否为空（不是列表并且可能包含单个记录或不包含任何记录），那么我通常使用@if(Model == null).

希望能帮助到你 ：）