C# 具有外键列的Listview源（WPF MVVM）

我有两个

可观察到的集合

（

员工

-->FirstName，LastName，DepartmentFK/

部门

-->Id，Department）

Employees

包含一个外键（

DepartmentFK

），该外键链接到我的数据库表上的

Id

（

departments

表）

我想要的是显示所有员工，包括部门名称（而不是外键整数）

我的XAML如下所示：

<ListView Name="Employees_Listview" ItemsSource="{Binding Employees, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding YourSelectedItem, Mode=TwoWay}" Height="109">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="FirstName" DisplayMemberBinding="{Binding FirstName}"/>
            <GridViewColumn Header="LastName" DisplayMemberBinding="{Binding LastName}"/>
            <GridViewColumn Header="Departments" DisplayMemberBinding="{Binding DepartmentFK}"/>
        </GridView>
    </ListView.View>
</ListView>

因此，我的listview的源代码是

Employees

OC。由于我的viewmodel中有这两个集合，我希望有一种简单的方法来实现这一点

---

有人能告诉我怎么做吗？

说你的

员工

和

部门

课程是这样的：

public class Employee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string DepartmentFK { get; set; }
}

public class Department
{
    public string ID { get; set; }
    public string Dept { get; set; }
}

然后，我将创建一个新的“display”类，该类将保存您想要显示的结果，即

FirstName

，

LastName

，以及

部门的对象

类：

public class DisplayEmployee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public Department Dept { get; set; }
}

现在，您可以在

视图模型中筛选
员工
数据，并创建
显示员工
的列表：

Employees = new List<Employee>
{
    new Employee() { FirstName = "A", LastName = "Z", DepartmentFK = "D1" },
    new Employee() { FirstName = "B", LastName = "Y", DepartmentFK = "D2" },
    new Employee() { FirstName = "C", LastName = "X", DepartmentFK = "D1" },
    new Employee() { FirstName = "D", LastName = "W", DepartmentFK = "D3" },
    new Employee() { FirstName = "E", LastName = "V", DepartmentFK = "D2" }
};

Departments = new List<Department>
{
    new Department() { ID = "D1", Dept = "Department 01" },
    new Department() { ID = "D2", Dept = "Department 02" },
    new Department() { ID = "D3", Dept = "Department 03" },
    new Department() { ID = "D4", Dept = "Department 04" }
};

DisplayEmployees = new List<DisplayEmployee>();
foreach (var emp in Employees)
{
    DisplayEmployees.Add(
    new DisplayEmployee()
    {
        FirstName = emp.FirstName,
        LastName = emp.LastName,
        Dept = Departments.Where(x => x.ID == emp.DepartmentFK).FirstOrDefault()
    });
}

public class DisplayEmployee : Employee
{
    public Department Dept { get; set; }
}


编辑
您甚至可以将
DisplayEmployee
设置为
Employee
的派生类：

Employees = new List<Employee>
{
    new Employee() { FirstName = "A", LastName = "Z", DepartmentFK = "D1" },
    new Employee() { FirstName = "B", LastName = "Y", DepartmentFK = "D2" },
    new Employee() { FirstName = "C", LastName = "X", DepartmentFK = "D1" },
    new Employee() { FirstName = "D", LastName = "W", DepartmentFK = "D3" },
    new Employee() { FirstName = "E", LastName = "V", DepartmentFK = "D2" }
};

Departments = new List<Department>
{
    new Department() { ID = "D1", Dept = "Department 01" },
    new Department() { ID = "D2", Dept = "Department 02" },
    new Department() { ID = "D3", Dept = "Department 03" },
    new Department() { ID = "D4", Dept = "Department 04" }
};

DisplayEmployees = new List<DisplayEmployee>();
foreach (var emp in Employees)
{
    DisplayEmployees.Add(
    new DisplayEmployee()
    {
        FirstName = emp.FirstName,
        LastName = emp.LastName,
        Dept = Departments.Where(x => x.ID == emp.DepartmentFK).FirstOrDefault()
    });
}

public class DisplayEmployee : Employee
{
    public Department Dept { get; set; }
}

您不应该让您的
视图
执行
视图模型
工作。您应该创建一个自定义类来保存要显示的结果，并在
VM
中进行筛选。Sach所指的自定义类可能是一个包含所有员工属性的Employee viewmodel，以及一个引用部门对象的Department属性。然后，您可以绑定到
部门.Name
而不是
部门fk
。我确实有一个员工视图模型，其中包含所有属性，如LastName等，甚至还有部门名称，但我的源代码是ObservableCollection“Employees”，这个只有外键。所以我必须用Department.Name而不是外键创建一个新集合？（很抱歉这个可能是“愚蠢”的问题，但C#、WPF和MVVM对我来说是全新的）@Moritz您的
EmployeeViewModel
集合中的
EmployeeViewModel
应该有一个
Department
属性，它是对
Department
对象的引用。我不知道“用Department.Name创建一个新集合”是什么意思。@Ed尝试了Sach昨天发布的方法，它似乎起了作用，尽管我已经将所有内容都更改为ObservableCollection。我想多读几篇文章，一定有一种没有第三类的方法（DisplayEmployees）