Question

我想使用实体框架将一条记录更新到数据库。当更新此记录的该员工的所有日期设置为Null Only Employee Code And IsActive ..如何仅更新isAcive

这是我的代码

       private void btn_Save_Resignation_Click(object sender, EventArgs e)
       {
          try
           {
                   var IsActive = new database.tblEmployeeData
                   {

                       EmployeeCode = Convert.ToInt32(txtEmpCode.Text),
                       IsActive = cbxResignationEmp.Checked = true, 
                   };


                       db.tblEmployeeDatas.AddOrUpdate(IsActive);
                       db.SaveChanges();
                       MessageBox.Show("تم إقالة الموظف بنجاح", "Sigma Software", MessageBoxButtons.OK, MessageBoxIcon.Information);
                       ClearResignation();

           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message, "Sigma Software", MessageBoxButtons.OK, MessageBoxIcon.Information);
           }
}

........ 这是我的模特班

   public partial class tblEmployeeData
   {
       [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
       public tblEmployeeData()
       {
           this.tblBlackListForEmps = new HashSet<tblBlackListForEmp>();
           this.tblContractForEmploees = new HashSet<tblContractForEmploee>();
           this.tblCustodyForEmps = new HashSet<tblCustodyForEmp>();
           this.tblDocumentEmployeeWithStates = new HashSet<tblDocumentEmployeeWithState>();
           this.tblOtherDataForEmps = new HashSet<tblOtherDataForEmp>();
           this.tblPenaltyForEmployees = new HashSet<tblPenaltyForEmployee>();
       }

       public int EmployeeCode { get; set; }
       public string EmployeeName { get; set; }
       public Nullable<byte> GenderCode { get; set; }
       public Nullable<byte> PranchCode { get; set; }
       public Nullable<byte> RelationShipCode { get; set; }
       public Nullable<byte> AdministrationCode { get; set; }
       public Nullable<byte> DepartmentCode { get; set; }
       public Nullable<short> JopCode { get; set; }
       public Nullable<byte> JopLevelCode { get; set; }
       public Nullable<byte> ConCustmerCode { get; set; }
       public Nullable<byte> NationalityCode { get; set; }
       public Nullable<byte> TypeOfWorkersCode { get; set; }
       public Nullable<bool> IsActive { get; set; }

Answer 1

如here所述：

实体框架无法神奇地找出哪些属性具有已更改与未更改的属性之间的关系，它需要实体，如果存在，则将实体按原样输入数据库当前已填充。如果该实体不存在，则将其插入数据库。

因此，我建议您以以下方式更改代码：

var empCode = Convert.ToInt32(txtEmpCode.Text);
var IsActive = db.tblEmployeeDatas.FirstOrDefault(e => e.EmployeeCode == empCode);
if (IsActive == null)
{
   IsActive = new database.tblEmployeeData
   {
      EmployeeCode = empCode,
   };
}
IsActive.IsActive = cbxResignationEmp.Checked = true, // BTW should it be assigning or condition?

db.tblEmployeeDatas.AddOrUpdate(IsActive);
db.SaveChanges();
...

使用实体框架更新一条记录

1 个答案: