Question

我发现this的GitHub帖子显示了一个方便的Xamarin DataGrid。但是，我想更进一步，并在最左边的列中添加一个复选框，以便我可以在按钮上单击以捕获已选择的网格中的所有ID。

这在Xamarin.Forms和C#中可以实现吗？

修改
因此，经过大量的搜索之后，我发现使用“切换”会容易得多，并且我的XAML拥有此代码。我的问题是如何将数据库字段绑定到标签的绑定？

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"  
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
         x:Class="Test.Pages.TestApprove" >
<ContentPage.Content>
<StackLayout>
<Label Text="The users below are Requesting Access:"></Label>
<Grid Padding="5,0" RowSpacing="1" ColumnSpacing="1">
    <Grid.RowDefinitions>
        <RowDefinition Height="auto" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="auto" />
    </Grid.ColumnDefinitions>
    <Switch Grid.Row="0" Grid.Column="0" VerticalOptions="Center" 
            HorizontalOptions="Center" BackgroundColor="Brown" />
    <Label Text="{Binding fname}" Grid.Row="0" Grid.Column="1" 
           Grid.ColumnSpan="1" Margin="1" 
           BackgroundColor="Blue" IsEnabled="false"/>
    <Entry Text="{Binding lname}" Grid.Row="0" Grid.Column="2" 
           Grid.ColumnSpan="1" Margin="1" IsEnabled="false"
           FontSize="Small" BackgroundColor="Purple" />
    <Entry Text="{Binding company}" Grid.Row="0" Grid.Column="3" 
           Grid.ColumnSpan="1" Margin="1"
           FontSize="Small" BackgroundColor="Green" />
    <Entry Text="{Binding Phone}" Grid.Row="0" Grid.Column="4" 
           Grid.ColumnSpan="1" Margin="1"  
           FontSize="Small" BackgroundColor="Orange" />
</Grid>
<Button Command="{Binding ApproveUserCommand}" Text="Approve User" TextColor="White"
        FontAttributes="Bold" FontSize="Large" HorizontalOptions="FillAndExpand"  
        BackgroundColor="#088da5" />
</StackLayout>
</ContentPage.Content>  
</ContentPage>

当然，我想动态生成选择查询返回的行数...因此，如果有10个请求访问的用户，则每个用户数据应为10行。我要用正确的方法吗？如何绑定数据？

Answer 1

Xaml：

<ContentPage x:Name="self">
  <dg:DataGrid ItemsSource="{Binding Users}">
    <dg:DataGrid.Columns>
          <dg:DataGridColumn Title="Authorized" PropertyName="IsAuthorized" Width="100">
            <dg:DataGridColumn.CellTemplate>
              <DataTemplate>
                <Switch IsToggled="{Binding .}" HorizontalOptions="Center" VerticalOptions="Center"/>
              </DataTemplate>
            </dg:DataGridColumn.CellTemplate>
          </dg:DataGridColumn>
          <dg:DataGridColumn Title="Name" PropertyName="Name" Width="2*"/>
          <dg:DataGridColumn Title="Action" PropertyName="Id" PropertyName="Streak" Width="0.7*" IsSortable="False">
            <dg:DataGridColumn.CellTemplate>
              <DataTemplate>
                <!-- Here is the trick: command binds the ViewModel's method, since we needed the Id, we've added the id as column's binding context -->
                <Button Text="Authorize" Command="{Binding AuthorizeCommand,source={x:Reference self}}" CommandParameter="{Binding .}"/>
              </DataTemplate>
            </dg:DataGridColumn.CellTemplate>
          </dg:DataGridColumn>
    </dg:DataGrid.Columns>
  </dg:DataGrid>
</ContentPage>

ViewModel：

class MainViewModel
{

  public MainViewModel()
  {
    AuthorizeCommand = new Command<string>(CmdAuthorize);
  }

  public ICommand AuthorizeCommand{get;set;}
  public List<User> Users{get;set;}

  CmdAuthorize(string id)
  {
    var user = Users.First(x=>x.Id == id);
    user.IsAuthorized = true;
  }
}

型号：

class User: INotifyPropertyChanged
{
  bool _isAuthorized;
  public event PropertyChangedEventHandler PropertyChanged;
  public string Name{get;set;}  
  public string Id{get;set;}
  public bool IsAuthorized
  {
    get=>_isAuthorized;
    set
    { 
      _isAuthorized =value;
       PropertyChanged?.Invoke(nameof(IsAuthorized));
    }
  }
}

ps：请不要忘记设置页面的BindingContext

contentPage.BindingContext= new MainViewModel()

Answer 2

您的源代码中没有要绑定的列表。首先，您需要它。这是Xaml的DataGrid实现，没有任何块或第三方应用程序。 https://www.youtube.com/watch?v=IPIyzWpkrHU

Xamarin DataGrid如何绑定？

2 个答案: