在单击按钮时,我无法在互联网上找到如何在Xamarin表单项目中动态地向listview添加新项目的解决方案。我在互联网上获得的唯一内容是如何动态删除listview中的项目。
那么请问我如何在Xamarin表单中编写代码,以便在单击按钮时动态地向listview添加新项目?
如果List的ItemSource是一个ObservableCollection,只需在集合中添加一个项就应该更新列表
ObservableCollection<string> data = new ObservableCollection<string>();
data.Add("a");
data.Add("b");
data.Add("c");
myListView.ItemSource = data;
在你的事件处理程序中
protected void MyButtonClick(object sender, EventArgs a) {
data.Add("z");
}
在MainPage.xaml.cs后面的代码中,假设你有一个Person类
public class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
和
private ObservableCollection<Person> _persons;
public ObservableCollection<Person> Persons
{
get
{
return _persons ?? (_persons = new ObservableCollection<Person>());
}
}
在单击按钮事件处理程序(代码隐藏)中:
private void Button_OnClicked(object sender, EventArgs e)
{
//create person here
var person = new Person()
{
Name = "toumir",
Age = 25
};
//add the created person to the list
Persons.Add(person);
}
MainPage.xaml页面如下所示:
<?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:local="clr-namespace:App2"
x:Class="App2.MainPage">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackLayout Grid.Row="0">
<Button Clicked="Button_OnClicked" Text="Add Person"/>
</StackLayout>
<ListView Grid.Row="1" ItemsSource="{Binding Persons}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Margin="1">
<Label Text="{Binding Name}"/>
<Label Text="{Binding Age}"/>
</StackLayout>
<ViewCell.ContextActions>
<MenuItem Text="test"></MenuItem>
</ViewCell.ContextActions>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</ContentPage>