使用 VisualStudio C# 的 WPF 中的 DataGrid

本文关键字：中的 DataGrid WPF VisualStudio 使用 | 更新日期: 2023-09-27 18:35:54

我的窗口中有 3 个TexBox es、Button s 和 DataGrid。 当我将数据输入TextBox并单击按钮时，它应该添加到DataGrid中。我需要有关如何添加、删除和获取数据的代码。我是 wpf 的新手，请帮我编写代码。这是我的Xaml代码

  <Window x:Class="simpledatagrid.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="IDDATA" Height="350" Width="525">
<Grid  >
    <DataGrid BorderBrush="Black" BorderThickness="2" AutoGenerateColumns="True" Name="dgsample" Margin="200,10,10,75"></DataGrid>
    <Label  Content="ID :" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="26" Width="27"/>
    <Label  Content="Name :" HorizontalAlignment="Left" Margin="10,60,0,0" VerticalAlignment="Top" Height="26" Width="48"/>
    <Label  Content="Salary :" HorizontalAlignment="Left" Margin="10,110,0,0" VerticalAlignment="Top" Height="26" Width="47"/>
    <TextBox Name="tb1" HorizontalAlignment="Left" Height="20" Margin="60,10,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
    <TextBox Name="tb2" HorizontalAlignment="Left" Height="20" Margin="60,60,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
    <TextBox Name="tb3" HorizontalAlignment="Left" Height="20" Margin="60,110,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
    <Button Content="Get" HorizontalAlignment="Left" Margin="10,190,0,0" VerticalAlignment="Top" Width="75" Click="Get_Click" />
    <Button Content="Add" HorizontalAlignment="Left" Margin="10,230,0,0" VerticalAlignment="Top" Width="75" Click="Add_Click" />
    <Button Content="Delete" HorizontalAlignment="Left" Margin="10,270,0,0" VerticalAlignment="Top" Width="75" Click="Delete_Click" />
</Grid>

这是我.cs代码

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
         List<User> users = new List<User>();
                    users.Add(new User() { Id = 101, Name = "gin", Salary = 10 });
                    users.Add(new User() { Id = 102, Name = "alen", Salary = 20 });
                    users.Add(new User() { Id = 103, Name = "scott", Salary = 30 });
                    dgsample.ItemsSource = users;
            }
    private void Get_Click(object sender, RoutedEventArgs e)
    {
    }
    private void Add_Click(object sender, RoutedEventArgs e)
    {
    }
    private void Delete_Click(object sender, RoutedEventArgs e)
    {
    }
    }  
}

使用 VisualStudio C# 的 WPF 中的 DataGrid

首先，您可以使用 ObservableCollection

而不是 List。 因为 ObservableCollection 默认具有 INotifyCollectionChanged。ObservableCollection 是 TwoWay Binding。

ObservableCollection<User> users = new  ObservableCollection<User>();
public MainWindow()
{
    InitializeComponent();
                users.Add(new User() { Id = 101, Name = "gin", Salary = 10 });
                users.Add(new User() { Id = 102, Name = "alen", Salary = 20 });
                users.Add(new User() { Id = 103, Name = "scott", Salary = 30 });
                dgsample.ItemsSource = users;
}
private void Get_Click(object sender, RoutedEventArgs e)
{
     if (this.tb1.Text != string.Empty) { User currentUser = users.Single(select => select.Id == Int32.Parse(this.tb1.Text)); this.tb2.Text = currentUser.Name; this.tb3.Text = currentUser.Salary; } 
}
private void Add_Click(object sender, RoutedEventArgs e)
{
      users.Add(new User() { Id = 105, Name = "gin5", Salary = 100 });
}
private void Delete_Click(object sender, RoutedEventArgs e)
{
   users.RemoveAt(0);
}

定义要设置为DataGrid ItemsSource的 ObservableCollection 属性，并在要从DataGrid中添加/删除任何项目时更新它。更新集合将更新数据网格

        public MainWindow()
        {
            InitializeComponent();
            Users = new ObservableCollection<User>;
            Users.Add(new User() {Id = 101, Name = "gin", Salary = 10});
            Users.Add(new User() {Id = 102, Name = "alen", Salary = 20});
            Users.Add(new User() {Id = 103, Name = "scott", Salary = 30});
            dgsample.ItemsSource = Users;
        }
        private ObservableCollection<User> Users { get; set; }
        private void Add_Click(object sender, RoutedEventArgs e)
        {
            Users.Add(new User() {Id = int.Parse(tb1.Text), Name = tb2.Text, Salary = tb3.Text});
        }

此外，作为建议，添加/删除功能是内置的DataGrid，将CanUserAddRows和CanUserDeleteRows设置为 true 允许用户将项目直接添加到DataGrid中，因此您可能不需要文本框和按钮来添加/删除

  <DataGrid AutoGenerateColumns="True" CanUserAddRows="True" CanUserDeleteRows="True"></DataGrid>

如果你是WPF的新手，你应该从WPF的方式开始。在 WPF 中，应操作绑定到 UI 的数据，而不是直接操作 UI。此设计模式称为 MVVM。

在您的情况下，您将拥有一个类（称为 ViewModel），该类将包含User项（称为模型）的集合。

public class MainWindowViewModel
{
    public MainWindowViewModel()
    {
         Users = new ObservableCollection<User>();
                users.Add(new User() { Id = 101, Name = "gin", Salary = 10 });
                users.Add(new User() { Id = 102, Name = "alen", Salary = 20 });
                users.Add(new User() { Id = 103, Name = "scott", Salary = 30 });
    }
    public ObservableCollection<User> Users { get; set; }
}

在您的MainWindow（称为视图）代码隐藏中，您应该做的只是将其DataContext设置为MainWindowViewModel。

public MainWindow()
{
    InitializeComponent();
    DataContext = new MainWindowViewModel();
}

在窗口本身中，将集合绑定到 ViewModel 中的Users属性

 <DataGrid BorderBrush="Black" BorderThickness="2" AutoGenerateColumns="True" Name="dgsample" Margin="200,10,10,75" ItemsSource="{Binding Users}"></DataGrid>

至于您的TextBox，因为它们旨在装箱新User，您可以在ViewModel上拥有另一个User属性

public User NewUser { get; set; }

并将它们绑定到User类中的匹配属性

<TextBox Name="tb1" HorizontalAlignment="Left" Height="20" Margin="60,10,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100" Text="{Binding Path=NewUser.Id}"/>
<TextBox Name="tb2" HorizontalAlignment="Left" Height="20" Margin="60,60,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100" Text="{Binding Path=NewUser.Name}"/>
<TextBox Name="tb3" HorizontalAlignment="Left" Height="20" Margin="60,110,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100" Text="{Binding Path=NewUser.Salary}"/>

添加新User后，清除其属性。

至于您的按钮，它们应该通过命令与 ViewModel 通信，然后 ViewModel 仅使用它实现的简单Add和Remove方法来操作集合本身。您可以在此处了解更多信息

希望这有帮助

定义用户类：

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Salary { get; set; }
    public User()
    {
    }
    public User(int id, string name, int salary)
    {
        Id = id;
        Name = name;
        Salary = salary;
    }
}

然后在 MainWindow.xaml 中.cs将列表更改为 ObservableCollection（您需要添加;

using System.Collections.ObjectModel;//编辑

然后：

ObservableCollection<User> users;
public MainWindow()
{
    users = new ObservableCollection<User>();
    users.Add(new User() { Id = 101, Name = "gin", Salary = 10 });
    users.Add(new User() { Id = 102, Name = "alen", Salary = 20 });
    users.Add(new User() { Id = 103, Name = "scott", Salary = 30 });
    InitializeComponent();
    dgsample.ItemsSource = users;
}

private void Add_Click(object sender, RoutedEventArgs e)
{
    users.Add(new User(){Id = Int.Parse(tb1.Text), Name = tb2.Text, Salary = Int.Parse(tb3.Text)});
}
private void Delete_Click(object sender, RoutedEventArgs e)
{
    users.RemoveAt(dgSample.SelectedIndex);
}
// you can get what you need just selected proper User proprety
private void Get_Click(object sender, RoutedEventArgs e)
{
    MessageBox.Show(( (User)dgSample.Items[dgSample.SelectedIndex]).Name);
}
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