无法以ListView Xamarin窗体显示数据
无法以ListView Xamarin窗体显示数据
提问于 2021-02-19 03:58:18
我试图在我的ListView中显示XamarinApp中的数据，我的问题是我不能显示数据。我做了所有的绑定，我不认为我在绑定列表视图方面犯了错误。
有人能帮忙吗？
下面是我的UrlBindingModel的样子：
public class UrlBindingModel
{
public IList<Urls> UrlsList { get; set; }
public UrlBindingModel() // In this constructor we add a few items
{
try
{
UrlsList = new List<Urls>
{
new Urls() { Name = "TestName", Url = "localhost" },
new Urls() { Name = "TestName", Url = "localhost" },
new Urls() { Name = "Test", Url = "Test" },
new Urls() { Name = "Sas", Url = "Sas" }
};
}
catch (Exception ex)
{
}
}
public class Urls
{
public string Name { get; set; }
public string Url { get; set; }
}
}下面是我的Page.Xaml的样子：
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:models="clr-namespace:TestFormApp.Models;assembly=TestFormApp"
xmlns:views="clr-namespace:TestFormApp.Views;assembly=TestFormApp"
x:Class="TestFormApp.Pages.SettingsPage"
Title="Settings">
<ContentPage.BindingContext>
<views:UrlBindingModel></views:UrlBindingModel>
</ContentPage.BindingContext>
<ContentPage.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="40" />
<RowDefinition Height="40" />
<RowDefinition Height="40" />
<RowDefinition Height="10" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Label Text="Urls" Grid.Row="0" FontAttributes="Bold" FontSize="Large" HorizontalOptions="CenterAndExpand"></Label>
<StackLayout Grid.Row="1">
<Button x:Name="btnUrlPopUp" Text="Add Url" Clicked="BtnUrlPopUp_OnClicked"></Button>
</StackLayout>
<Grid Grid.Row="2" VerticalOptions="CenterAndExpand" Margin="10" Padding="10">
<Grid.RowDefinitions>
<RowDefinition Height="30" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="2.5*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1.5*" />
</Grid.ColumnDefinitions>
<Label Text="Name" Grid.Column="0" Grid.Row="0" Style="{DynamicResource headerTablet}" />
<Label Text=" Host Url" Grid.Column="1" Grid.Row="0" Style="{DynamicResource headerTablet}" />
<Label Text="Edit" Grid.Column="2" Grid.Row="0" Style="{DynamicResource headerTablet}" />
<Label Text="Delete" Grid.Column="3" Grid.Row="0" Style="{DynamicResource headerTablet}" />
<!--The box view creates a line under labels-->
<BoxView Grid.Row="3" HorizontalOptions="FillAndExpand"
VerticalOptions="Center" HeightRequest="2" BackgroundColor="DarkGray"></BoxView>
<ListView IsPullToRefreshEnabled="True" x:Name="lstUrlList" Grid.Row="4" ItemsSource="{Binding UrlsList}" Margin="4">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid VerticalOptions="CenterAndExpand" BackgroundColor="White" ColumnSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="40" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Label Text="{Binding Name, Mode=TwoWay}" Grid.Column="0" Grid.Row="0" Style="{DynamicResource detailTablet}" />
<Label Text="{Binding Url, Mode=TwoWay}" Grid.Column="1" Grid.Row="0" Style="{DynamicResource detailTablet}" />
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</Grid>
</ContentPage.Content>
</ContentPage>我错过了什么？？
提前感谢！
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-02-19 08:24:26
乍一看，您的视图模型没有实现INotifyPropertyChanged，因此不能通知您的xaml任何属性(包括一个用于itemssource的属性)都已更改。
1从BindableObject继承视图模型
public class UrlBindingModel : BindableObject2将你的道具换为
private IList<Urls> _urlsList;
public IList<Urls> UrlsList
{
get { return _urlsList; }
set
{
if (_IsProperty != value)
{
_IsProperty = value;
OnPropertyChanged();
}
}
}请注意，任何在运行时将更改且不调用OnPropertyChanged()的属性，当其更改时，都不会将其更改通知您的UI。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66277166
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