Question

'Employee'上的'number'属性无法设置为'System.Decimal'值。您必须将此属性设置为类型为“System.Double”的非null值。描述：执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

       Exception Details: System.InvalidOperationException: The 'number' property 
on 'Employee' could not be set to a 'System.Decimal' value. You must set this 
property to a non-null value of type 'System.Double'.

来源错误：

    Line 16:         {
    Line 17:             EmployeeContext empcon = new EmployeeContext();
    Line 18:             Employee employ = empcon.employees.Single(emp => emp.empid ==  
    id);
    Line 19:             return View(employ);
    Line 20:         }

请有人帮助我

[Table("tbl_employee")]
public class Employee
{
    [Key]public int empid { get; set; }
    public string name { get; set; }
    public string Address { get; set;}
    public double number { get; set; }
}

public class EmployeeContext :DbContext
{
    public DbSet<Employee> employees  { get; set; }
}

查看：

  @model Employee_data.Models.Employee
  @{
      ViewBag.Title = "Emloyee Details";
  }

  <h2>Emloyee Details</h2>
  <table style="font-family:Arial">
  <tr>

 <td>
<b>employee id</b>
 </td>
  <td>@Model.empid</td>
 </tr>
   <tr>
    <td>
   <b>employee Name</b>
</td>
<td>@Model.name</td>
  </tr>
    <tr>
    <td>
     <b>employee address</b>
     </td>
     <td>@Model.Address</td>
      </tr>

     <tr>
        <td>
        <b>employee number</b>
      </td>
    <td>@Model.number</td>
          </tr>
          </table>
       @Html.ActionLink("click me", "Details", new { id = "1" })

Global.asax中：

protected void Application_Start()
{
        Database.SetInitializer<Employee_data.Models.EmployeeContext>(null);
}

控制器：

public ActionResult Details(int id)
{
        EmployeeContext empcon = new EmployeeContext();
        Employee employ = empcon.employees.Single(emp => emp.empid == id);
        return View(employ);
}

web.config：

<connectionStrings>
    <add name="EmployeeContext" 
         connectionString="Data Source=server;Initial Catalog=Testdb;Integrated Security=True" 
         providerName="System.Data.SqlClient" />
</connectionStrings>

路线配置：

    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        RouteTable.Routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "emp", action = "Details", 
                            id = UrlParameter.Optional }
            );
    }

Answer 1

如果您尝试调用此控制器操作，则会抛出此错误   您不在路径部分或查询中指定ID   字符串参数。由于您的控制器操作采用id为   参数应确保始终指定此参数。

确保在您申请此操作时已指定   url中的有效ID：

Check this link

如果empid是您的关键，请尝试使用

[Key] public int empid{ get; set; }

'Employee'上的'number'属性无法设置为'System.Decimal'值

1 个答案: