asp-無法將類型為“System.Int32”的對象強制轉換為類型“System.Array”

無法將類型為“System.Int32”的對象強制轉換為類型“System.Array”

修改Edit.cshtml上部分字段，點擊保存跳轉到Index.cshtml。
但現在點擊保存，就跳出以下錯誤。

**這是Model **

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;

namespace MvcSilverTalent.Models
{
    public class RetireeModel
    {
        [Key]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int RetireNum { get; set; }

        [Required]
        [DisplayName("單位編號")]
        [MaxLength(3)]
        public string UnitID { get; set; }

        [Required]
        [DisplayName("員工編號")]
        [MaxLength(6)]
        public string EmployeeID { get; set; }

        [Required]
        [DisplayName("離退休類型")]
        public int RetireType { get; set; }

        [Required]
        [DisplayName("刪除標記")]
        public int DeleteFlag { get; set; }


        //
        // 基本信息


        [Required]
        [DisplayName("姓名")]
        [MaxLength(20)]
        public string Name { get; set; }

        [Required]
        [DisplayName("性別")]
        public Boolean Gender { get; set; }

        [Required]
        [DisplayName("身份證號碼")]
        public string IDCardNo { get; set; }

        [Required]
        [DisplayName("出生年月")]
        public DateTime Brityday { get; set; }

        [Required]
        [DisplayName("民族")]
        [MaxLength(30)]
        public string Nationality { get; set; }

        [Required]
        [DisplayName("籍貫")]
        [MaxLength(30)]
        public string NativePlace { get; set; }

        [DisplayName("黨派")]
        [MaxLength(30)]
        public string Party { get; set; }

        [DisplayName("所在黨支部")]
        [MaxLength(100)]
        public string PartyBranch { get; set; }

        [DisplayName("最高學歷")]
        [MaxLength(20)]
        public string EducationDegree { get; set; }

        [Required]
        [DisplayName("用戶組")]
        public string GroupName { get; set; }

        [Required]
        [DisplayName("是否參加愛心基金")]
        public Boolean HasLoveFund { get; set; }

        [DisplayName("享受愛心基金慰問情況")]
        public string LoveFundCase { get; set; }

        [DisplayName("慰問走訪情況")]
        public string VisitCase { get; set; }


        //
        // 工作信息


        [Required]
        [DisplayName("參加工作時期")]
        public int WorkPeriod { get; set; }

        [Required]
        [DisplayName("參加工作時間")]
        public DateTime WorkTime { get; set; }

        [Required]
        [DisplayName("退休時間")]
        public DateTime RetireTime { get; set; }

        [Required]
        [DisplayName("工齡")]
        public int WorkAge { get; set; }

        [Required]
        [DisplayName("退休單位")]
        [MaxLength(100)]
        public string UnitName { get; set; }

        [DisplayName("職稱代碼")]
        [MaxLength(3)]
        public int TitleID { get; set; }

        [DisplayName("職稱")]
        [MaxLength(30)]
        public string Title { get; set; }

        [DisplayName("職務")]
        [MaxLength(30)]
        public string Position { get; set; }

        [DisplayName("編制")]
        [MaxLength(30)]
        public string Formation { get; set; }


        //
        // 可修改信息 


        [Required]
        [MaxLength(255)]
        [DisplayName("近照")]
        public string PhotoUrl { get; set; }

        [MaxLength(255)]
        [DisplayName("特長")]
        public string Specialty { get; set; }

        [Required]
        [MaxLength(255)]
        [DisplayName("現住地址")]
        public string Address { get; set; }

        [MaxLength(30)]
        [DisplayName("家庭電話")]
        public string HomeTel { get; set; }

        [MaxLength(30)]
        [DisplayName("手機號碼")]
        public string MobileNum { get; set; }

        [MaxLength(10)]
        [DisplayName("郵政編碼")]
        public string ZipCode { get; set; }

        [MaxLength(40)]
        [DisplayName("郵箱")]
        public string Email { get; set; }


        public virtual ICollection<EventSignModel> EventSignModels { get; set; }
        public virtual ICollection<HealthSignMain> HealthSignMains { get; set; }
    }
}

**這是controller **

        // GET: /UserInfo/Edit.cshtml

        public ActionResult Edit(int RetireNum) 
        {
            RetireeModel RetireeModel = db.RetireeModels.Find(RetireNum);
            if (RetireeModel == null)
            {
                return HttpNotFound();
            }
            return View(RetireeModel);
        }


        //
        // POST: /UserInfo/Edit.cshtml

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(RetireeModel RetireeModel)
        {
            Response.Write("<script>alert('ddddd')</script>");

            if (ModelState.IsValid)
            {
                db.Entry(RetireeModel).State = EntityState.Modified;

                db.SaveChanges();
                return RedirectToAction("Index");
            }
            Response.Write("<script>alert('xxxx')</script>");

            return View("Index");
        }

最佳回答：

        [DisplayName("職稱代碼")]
        [MaxLength(3)]
        public int TitleID { get; set; }