c# is not accessible due to its protection level and can only handle public types Detailed code introduction

An error was encountered when implementing C# to export List data to an xml file [source code attached]: inaccessible due to its protection level. Can only handle public types.

The line of code that generated the error:

XmlSerializer xmlSerializer = new XmlSerializer(typeof(List<UserModel>));

Cause of error: The class in the following code is defined as:

class UserModel

No public access modifier is added

    /// <summary>
    /// 用户实体类
    /// 
    /// 注意：类的访问修饰符必须是：public，否则会出现错误：
    /// 因其保护级别而不可访问。只能处理公共类型。
    /// </summary>
    [Serializable]
    public class UserModel
    {
        private long id = 1;

        private string name = "name";

        private int gender = 0;

        private int age = 20;

        private string userName = "userName";

        private string password = "password";

        public long Id
        {
            get { return id; }
            set { id = value; }
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public int Gender
        {
            get { return gender; }
            set { gender = value; }
        }

        public int Age
        {
            get { return age; }
            set { age = value; }
        }

        public string UserName
        {
            get { return userName; }
            set { userName = value; }
        }

        public string Password
        {
            get { return password; }
            set { password = value; }
        }
    }

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