模型绑定在 Asp.net Core 3.0 中不起作用

Question

关注这篇文章https://docs.microsoft.com/en-us/aspnet/core/mvc/models/model-binding?view=aspnetcore-3.0：

[Bind] attribute
Can be applied to a class or a method parameter. Specifies which properties of a model should be included in model binding.

In the following example, only the specified properties of the Instructor model are bound when any handler or action method is called:

C#

Copy
[Bind("LastName,FirstMidName,HireDate")]
public class Instructor
In the following example, only the specified properties of the Instructor model are bound when the OnPost method is called:

C#

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[HttpPost]
public IActionResult OnPost([Bind("LastName,FirstMidName,HireDate")] Instructor instructor)
The [Bind] attribute can be used to protect against overposting in create scenarios. It doesn't work well in edit scenarios because excluded properties are set to null or a default value instead of being left unchanged.

我有一个模型定义为

public class Family
{
    public int ID { get; set; }
    public string Name { get; set; }

    public string Address { get; set; }
}

当我在 Web Api 控制器中使用它时，我希望输入的 faimly 模型只有 name 属性，但忽略 address 属性（null 或空）。 PostMan Json 身体：

 {
"Name": "Faimly1",
"Address":"Address1"
 }

    [HttpPost]
    public async Task<ActionResult<Family>> PostFamily([FromBody][Bind("Name")] Family family)
    {
        Console.WriteLine(family.Name); // Expect the string "Family1".
        Console.WriteLine(family.Address); // Should be empty even I have passed a string value.
    }

当我使用 Postman 测试操作时，我仍然得到 Address 值。 我应该怎么办？我在 asp.net core 3.0 和 asp.net core 2.1 中都对此进行了测试，并得到了相同的结果。

或者这个 Bind 只适用于标签助手？

Answer 1

您可以尝试在模型类中使用JsonIgnoreAttribute，而不是BindAttribute：

public class Family
{
    public int ID { get; set; }
    public string Name { get; set; }

    [JsonIgnore]
    public string Address { get; set; }
}