我有一个应用 WPF MVVM ,允许员工创建一个或多个项目,每个项目属于员工所以我的问题是: 当我添加员工时,我还想添加一个项目,以便项目接收 员工的 ID ,以便我可以识别关系员工和项目之间。这是一个例子:
Employee (Id = 1) --------> Project (id = 1)
Project (id = 2)
Project (id = 3)
Employee (Id = 2) --------> Project (id = 4)
Project (id = 5)
Project (id = 6)
这是我的代码:
员工ViewModel:
public class EmployeeViewModel
{
Employee _employee = new Employee();
private IList<Project> _ListeProject;
public IList<Project> ListeProject
{ get; set; }
public void InsetEmployee(Employee Employee)
{
context.Employee.Add(Employee);
context.Entry(Employee).State = EntityState.Added;
context.SaveChanges();
}
private void AddEmployee()
{ InsetEmployee(_employee); }
}
Project ViewModel:
public class ProjectViewModel
{
Project _project = new Project();
ProjectBL _projectBL = new ProjectBL ();
private void AddProject()
{ _projectBL.InsetProject(_project); }
}
Employee.xaml:
<telerik:RadButton Content="Add" Height="23" Name="btnAdd"
HorizontalAlignment="Stretch" VerticalAlignment="Bottom"
Width="120" Command="{Binding AddEmployeeCMD}"/>
<telerik:RadButton Content="Add Project" Height="23"
HorizontalAlignment="Stretch" VerticalAlignment="Bottom"
Width="120" Click="Project"/>
答案 0 :(得分:2)
这一切都取决于你如何存储它等等。如果它存储在关系数据库中,那么最简单的事情就是创建外键,这将是一对多关系,其中一个Employee有多个项目,但每个项目只有一个所有者(Employee)。然后在代码中你必须拥有反映这种关系的属性,例如项目将具有EmployeeId属性,而Employee将具有项目ID列表作为属性。如果您不想更改您的课程,也可以使用单独的表格/对象来存储关系。
答案 1 :(得分:0)
看起来像一个简单的问题需要解决。
class Employee
{
public int Id { get; set; }
public IEnumerable<Project> Projects { get; set; }
}
class Project
{
public int EmployeeId { get; set; }
public string Name { get; set; }
}
var employee = new Employee { Id = 1, Projects = new List<Project>
{
new Project { EmployeeId = 1, Name = "Foo" },
new Project { EmployeeId = 1, Name = "Bar" }
}};