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MiT
Asked:2020-07-13 18:01:06 +0000 UTC2020-07-13 18:01:06 +0000 UTC

刷新 ListView 中的数据 (C#/WPF)

  • 772

有一个ListView在里面写入数据，事实是没有办法一次把所有的东西都写完，所以需要更改/更新已经输入到ListView中的数据。做这个的最好方式是什么？

<ListView x:Name="ClientsInfo">
    <ListView.View>
        <GridView>
            <GridViewColumn DisplayMemberBinding="{Binding Path=ConnectionID}">ID</GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding Path=ClientName}">Name</GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding Path=Version}">Version</GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding Path=ComputerID}">Computer ID</GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding Path=ClientIP}">Client IP</GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding Path=PingTime}">Ping Time</GridViewColumn>
        </GridView>
    </ListView.View>
</ListView>



public class ClientsInfo
{
    public string ConnectionID { get; set; }
    public string ClientName { get; set; }
    public string Version { get; set; }
    public string ComputerID { get; set; }
    public string ClientIP { get; set; }
    public string PingTime { get; set; }
}

ClientsInfo.Items.Add(new ClientsInfo
{
    ConnectionID = clientNumber.ToString(),
    ClientName = "Receiving...",
    Version = "Receiving...",
    ComputerID = "Receiving...",
    ClientIP = clientIP,
    PingTime = "..."
});
ClientsInfo.Items.Refresh();

...

ClientsInfo.Items.Add(new ClientsInfo
{
    ClientName = clientsName,
    Version = versionStr,
    ComputerID = computerName,
});
ClientsInfo.Items.Refresh();

...

ClientsInfo.Items.Add(new ClientsInfo
{
    PingTime = $"{elapsedTimeInMilliseconds:0.##}ms"
});
ClientsInfo.Items.Refresh();
c#

1 个回答

  1. Best Answer

    例子。本质：

    public class User : INotifyPropertyChanged
{
    private string name;
    public string Name
    {
        get => name;
        set
        {
            name = value;
            // Уведомляем об изменении свойства
            NotifyPropertyChanged();
        }
    }

    private int age;
    public int Age
    {
        get => age;
        set { age = value; NotifyPropertyChanged(); }
    }

    #region Реализация INPC — обычно выносится в отдельный базовый класс
    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    public event PropertyChangedEventHandler PropertyChanged;
    #endregion
}

    窗户：

    public partial class MainWindow : Window
{
    private ObservableCollection<User> users = new ObservableCollection<User>();

    public MainWindow()
    {
        InitializeComponent();
        myListView.ItemsSource = users;
    }

    private void Button1_Click(object sender, RoutedEventArgs e)
    {
        users.Add(new User { Name = "Василий", Age = 25 });
    }

    private void Button2_Click(object sender, RoutedEventArgs e)
    {
        users.Add(new User { Name = "Петр", Age = 37 });
    }

    private void Button3_Click(object sender, RoutedEventArgs e)
    {
        users[1].Name = "Иван";
    }

    private void Button4_Click(object sender, RoutedEventArgs e)
    {
        users.RemoveAt(0);
    }
}

    窗口布局：

    <Grid Margin="5">
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <ListView Name="myListView">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Имя" DisplayMemberBinding="{Binding Name}"/>
                <GridViewColumn Header="Возраст" DisplayMemberBinding="{Binding Age}"/>
            </GridView>
        </ListView.View>
    </ListView>

    <UniformGrid Grid.Row="1" Rows="1" Margin="0,5,0,0">
        <UniformGrid.Resources>
            <Style TargetType="Button">
                <Setter Property="Margin" Value="2.5,0"/>
            </Style>
        </UniformGrid.Resources>
        <Button Content="1" Click="Button1_Click"/>
        <Button Content="2" Click="Button2_Click"/>
        <Button Content="3" Click="Button3_Click"/>
        <Button Content="4" Click="Button4_Click"/>
    </UniformGrid>
</Grid>

    在此处输入图像描述

    从代码中可以看出，我们只使用强类型集合users，GUI 中的所有更改都会自动获取。

    下一步是分离 GUI 和应用程序逻辑。我们以命令的形式描述所有动作，我们将所有数据放在单独的类中（而不是像现在这样，窗口类中的集合）。嗯，这种方法的最高点是 MVVM 模式。

    • 1

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