Question

我是C＃WPF的新手，正在对DataGrid进行一些非常基本的测试。我可以将数据绑定到DataGrid，但在我修改行之后，我只能收到旧数据。有人能告诉我我的代码有什么问题吗？这是我的代码：

XAML

<Window x:Class="abc.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid Name="dgEmployee" AutoGenerateColumns="False"
                  RowEditEnding="OnRowEditEnding">
            <DataGrid.Columns>
                <DataGridTextColumn Header="ID" Binding="{Binding EmpNo}"/>
                <DataGridTextColumn Header="Name" Binding="{Binding EmpName}"/>
                <DataGridTextColumn Header="Salary" Binding="{Binding Salary,
                    StringFormat='#,##0.00'}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

代码隐藏

using System.Windows;

namespace abc
{
    public partial class MainWindow : Window
    {
        EmployeeList emp = new EmployeeList();


        public MainWindow()
        {
            InitializeComponent();
            dgEmployee.ItemsSource = emp;
        }

        private void OnRowEditEnding(object sender, System.Windows.Controls.DataGridRowEditEndingEventArgs e)
        {
            var _emp = e.Row.Item as Employee;
            MessageBox.Show(string.Format("updated record:\n{0}\n{1}\n{2}",
            _emp.EmpNo, _emp.EmpName, _emp.Salary));
        }
    }
}

这是Employee类：

using System.Collections.ObjectModel;

namespace abc
{
    public class Employee
    {
        private int _empNo;
        private string _empName;
        private decimal _salary;

        public Employee(int Id, string Name, decimal wage)
        {
            this._empNo = Id;
            this._empName = Name;
            this._salary = wage;
        }

        public int EmpNo { get { return _empNo; } set { _empNo = value; } }
        public string EmpName { get { return _empName; } set { _empName = value; } }
        public decimal Salary { get { return _salary; } set { _salary = value; } }
    }

    public class EmployeeList : ObservableCollection<Employee>
    {
        public EmployeeList()
            : base()
        {
            Add(new Employee(1, "Bart Simpson", (decimal)10));
            Add(new Employee(2, "Homer Simpson", (decimal)500));
            Add(new Employee(3, "Maggie Simpson", (decimal)200));
        }
    }
}

Answer 1

每次更改属性时，您都需要更改WPF绑定以强制更新回Employee类。目前，默认情况下，只有在OnRowEditEnding事件之后发生焦点丢失时才会更新：

<DataGridTextColumn Header="ID" Binding="{Binding EmpNo, UpdateSourceTrigger=PropertyChanged}"/>

Answer 2

解决方法：更新要更改的静态行列表使用另一个事件来更新roweditending事件之后的行

{{1}}

Datagrid.RowEditEnding不返回更新值

2 个答案: