问题

我的模型是使用数据库优先方法创建的（下面是命令）。

```csharp
Scaffold-DbContext “Server=127.0.0.1; database=EmployeePortal; user id = sa; password = <MyStringLocalPassword>;Encrypt=False;” Microsoft.EntityFrameworkCore.SqlServer –ContextDir Data -OutputDir Models

这里是我的模型：

public partial class Employee
{
    public int Id { get; set; }

    public string Name { get; set; } = null!;

    public string JobDescription { get; set; } = null!;

    public string Number { get; set; } = null!;

    public string Department { get; set; } = null!;

    public decimal HourlyPay { get; set; }

    public decimal Bonus { get; set; }

    public int EmployeeTypeId { get; set; }

    public virtual EmployeeType IdNavigation { get; set; } = null!;
}

public partial class EmployeeType
{
    public int Id { get; set; }

    public string EmployeeType1 { get; set; } = null!;

    public virtual Employee? Employee { get; set; }
}

以下是生成的控制器方法：

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("Id,Name,JobDescription,Number,Department,HourlyPay,Bonus,EmployeeTypeId")] Employee employee)
{
    if (ModelState.IsValid)
    {
    }
}

在这里，对我来说，ModelState.IsValid 总是为 false。

当我检查时，我可以看到以下值。

我该如何解决这个问题？

我找到了一个堆栈溢出的帖子，其中解决方案是删除并重新创建数据库。

还有其他方法吗？

<details>
<summary>英文:</summary>

My models are created using DB first approach(below command).

    Scaffold-DbContext “Server=127.0.0.1; database=EmployeePortal; user id = sa; password = &lt;MyStringLocalPassword&gt;;Encrypt=False;” Microsoft.EntityFrameworkCore.SqlServer –ContextDir Data -OutputDir Models

Here are my models

    public partial class Employee
    {
    public int Id { get; set; }

    public string Name { get; set; } = null!;

    public string JobDescription { get; set; } = null!;

    public string Number { get; set; } = null!;

    public string Department { get; set; } = null!;

    public decimal HourlyPay { get; set; }

    public decimal Bonus { get; set; }

    public int EmployeeTypeId { get; set; }

    public virtual EmployeeType IdNavigation { get; set; } = null!;
    }

    public partial class EmployeeType
    {
    public int Id { get; set; }

    public string EmployeeType1 { get; set; } = null!;

    public virtual Employee? Employee { get; set; }
    }

Below are the scafolded controller method.

    [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task&lt;IActionResult&gt; Create([Bind(&quot;Id,Name,JobDescription,Number,Department,HourlyPay,Bonus,EmployeeTypeId&quot;)] Employee employee)
        {
            if (ModelState.IsValid)
            {
            }
        }


here for me ModelSatate.IsValid is always false.

I can see the below values when I inspect.

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/ay3Hj.png


How can I resolve this?

I got a stack overflow post where the solution is to delete and recreate the database. 

Is there any other methods?

</details>


# 答案1
**得分**: 0

要实现您的需求，一种方法是您可以从项目文件中删除以下内容：

```xml
<Nullable>enable</Nullable>

（双击项目名称或右键单击项目选择编辑项目文件）。

或者添加?，如下所示：

public virtual EmployeeType? IdNavigation { get; set; } = null!;

<Nullable>enable</Nullable> 

public virtual EmployeeType? IdNavigation { get; set; } = null!;