MVVM - 将 2 个视图模型转换为一个视图

Question

我正在开发一个使用 MVVM 的模块。 我有一个Patient.cs和 3 个视图模型ViewModel1 、 ViewModel2 、 ViewModel3 。 我很难将 3 个视图模型转换为一个 model。 有人可以帮忙吗。 下面是我的代码：

ViewModel1.cs

    public class ViewModel1 {
        [Required]
        public string? YearOfBirth { get; set; }
        [Required]
        public string? DriversLicenseId { get; set; }
        public static implicit operator ViewModel1(Patient patient)
        {
            return new ViewModel1 {
                YearOfBirth = patient.YearOfBirth,
                DriversLicenseId = patient.DriversLicenseId
            };
        }
        public static implicit operator Patient(ViewModel1 ViewModel1)
        {
            return new Patient {
                YearOfBirth = ViewModel1.YearOfBirth,
                DriversLicenseId = ViewModel1.DriversLicenseId
            };
        }
    }

ViewModel2.cs

    public class ViewModel2
    {
        [Required]
        [StringLength(16, ErrorMessage = "First name should be 16 character or less.")]
        public string? FirstName { get; set; }
    
        [Required]
        [StringLength(16, ErrorMessage = "Last name should be 16 character or less.")]
        public string? LastName { get; set; }
    
        [Required]
        public DateTime? DateOfBirth { get; set; }
    
        [Required]
        [EnumDataType(typeof(Gender), ErrorMessage = "Please select Gender.")]
        public Gender? Gender { get; set; }
    
        public static implicit operator ViewModel2(Patient patient)
        {
            return new ViewModel2 {
                FirstName = patient.FirstName,
                LastName = patient.LastName,
                DateOfBirth = patient.DateOfBirth,
                Gender = patient.Gender
            };
        }
        public static implicit operator Patient(ViewModel2 ViewModel2)
        {
            return new Patient {
                FirstName = ViewModel2.FirstName,
                LastName = ViewModel2.LastName,
                DateOfBirth = ViewModel2.DateOfBirth,
                Gender = ViewModel2.Gender
            };
        }
    }

ViewModel3.cs

public class ViewModel3
    {
        [Required]
        public string? Address1 { get; set; }
        [Required]
        public string? City { get; set; }
        [Required]
        public string? State { get; set; }
        [Required]
        public string? ZipCode { get; set; }    
    
        public static implicit operator ViewModel3(Patient patient)
        {
            return new ViewModel3 {
                FirstName = patient.FirstName,
                LastName = patient.LastName,
                DateOfBirth = patient.DateOfBirth,
                Gender = patient.Gender
            };
        }
        public static implicit operator Patient(ViewModel3 ViewModel3)
        {
            return new Patient {
                FirstName = ViewModel3.FirstName,
                LastName = ViewModel3.LastName,
                DateOfBirth = ViewModel3.DateOfBirth,
                Gender = ViewModel3.Gender
            };
        }
    }

Model Patient.cs

    public class Patient 
    {
       public string? FirstName { get; set; }
       public string? LastName { get; set; }
       public DateTime? DateOfBirth { get; set; }
       public Gender? Gender { get; set; }
       public string? YearOfBirth { get; set; }
       public string? DriversLicenseId { get; set; }
       public string? Address1 { get; set; }
       public string? City { get; set; }
       public string? State { get; set; }
       public string? ZipCode { get; set; } 
       public string? PaymentType { get; set; }
     }

我正在寻找某种包装器或隐式运算符，因此我可以将所有三个视图模型都转换为 Patient.cs。

谢谢。