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c# - 使用实体框架更新一条记录

问题描述

我想使用实体框架将一条记录更新到数据库。当更新此员工的所有日期时，仅设置 Null 员工代码和 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);
           }
}

..................这是我的模型课

   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; }

标签： c#entity-frameworkinsert-update

解决方案

如此处所述：

Entity Framework 不会神奇地找出哪些属性已更改与哪些属性未更改，它获取实体，如果存在，则将实体输入到当前填充的数据库中。如果实体不存在，则将其插入数据库。

因此，我建议您通过以下方式更改代码：

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();
...

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