Question

我有一个JSON对象进入Web API中的控制器，该控制器没有绑定到我的模型。我正在使用Fiddler测试它，身体中有以下JSON：

{
"userList": {
    "user": [
        {
            "custCode": "test1",
            "userName": "TheDude",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Bob",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Ted",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Darryl",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        }
    ]
}

}

我已经包含了为模型和控制器方法构建的类。

public class UserList
{
    public List<User> userList { get; set; }
}

public class User
{
    public string custCode { get; set; }
    public string userName { get; set; }
    public bool admin { get; set; }
    public DateTime effectiveDate { get; set; }
}

[HttpPost]
    public void CreateNewUser(UserList newUsers)
    {
        var conn = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
        conn.Open();

        try
        {
            foreach (var user in newUsers.userList)
            {
                //SQL code is here
            }
        }

        finally
        {
            conn.Close();
            conn.Dispose();
        }
    }

它挂在foreach循环上，给我一个“对象引用未设置为对象的实例”错误。我注意到，当它第一次命中方法时，UserList对象为null。我很欣赏有关我做错的任何观察。

Answer 1

通过执行以下操作解决了问题：

我将UserList类更改为字符串数组：

public class UserList
{
    public User[] users { get; set; }
}

然后我重新格式化了我的请求主体JSON：

 {
    "users": [
        {
            "custCode": "test1",
            "userName": "TheDude",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Bob",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Ted",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        },
        {
            "custCode": "test1",
            "userName": "Darryl",
            "admin": "false",
            "effectiveDate": "2/14/2014"
        }
    ]
}

在更改之后，我使用Fiddler进行了重新测试，一切正常。

Answer 2

应该是这样的：

public class OuterClass有一个private UserList userList，然后又有一个名为：

的课程

public class UserList有一个private List<User> user

基本上：

public class OuterClass
{
    private UserList userList {get; set; }
}

public class UserList
{
    private List<User> user {get; set; }
}

如果您认为JSON中的某些键名称命名错误，即使我这么认为。

JSON用户列表未绑定到Web API中的模型

2 个答案: