我一直在爬陡峭的WPF山!因此,我想创建一个允许用户动态添加文本框的UI。为此,他们将按一下按钮。
我已经设法在后面使用代码创建了此代码,但我想转向MVVM结构,因此视图中没有任何代码。我已经尝试过ICommand和ObservableCollection,但是我缺少了一些东西,我也不知道在哪里。这是我的简单示例。
XAML:非常基本,只有一个按钮可以添加一行。
<Window x:Class="WPFpractice072514.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WPFpractice072514"
Title="MainWindow" Height="350" Width="525">
<Grid Name="mymy" >
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Button Grid.Column="0" Grid.Row="0" Name="ButtonUpdateArtist"
Content="Add TextBox" Click="ButtonAddTexboxBlockExecute" />
</Grid>
</Window>
背后的C#代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WPFpractice072514
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
#region members
int count = 0;
#endregion
public MainWindow()
{
InitializeComponent();
}
private void ButtonAddTexboxBlockExecute(Object Sender, RoutedEventArgs e)
{
TextBox t = new TextBox();
t.Height = 20;
t.Width = 20;
t.Name = "button";
RowDefinition rowDef1;
rowDef1 = new RowDefinition();
mymy.RowDefinitions.Add(rowDef1);
ColumnDefinition colDef1;
colDef1 = new ColumnDefinition();
mymy.ColumnDefinitions.Add(colDef1);
++count;
mymy.Children.Add(t);
Grid.SetColumn(t, 1);
Grid.SetRow(t, count);
}
}
}
问题:我需要什么代码(XAML和C#)才能将方法从代码后面移到视图模型中?
您可以使用命令动态添加文本框吗?
我假设文本框必须保存在一个容器中,在这种情况下,该容器是用于网格的。但是,如果我使用的是MVVM,是否需要在列表视图或使用ItemsSource的其他容器中包含文本框?
请按照以下步骤操作,您已完成:
ItemsControl
它并将其绑定ItemsSource
到ViewModel中的某个集合(最好是ObservableCollection)。ItemTemplate
为其中包含TextBox的ItemsControl定义。ICommand
在ViewModel中创建一个并将其绑定到button。XAML:
<StackPanel>
<Button Content="Add TextBox" Command="{Binding TestCommand}"/>
<ItemsControl ItemsSource="{Binding SomeCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=.}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
ViewModel:
public class MainWindowViewModel : INotifyPropertyChanged
{
public ObservableCollection<string> SomeCollection { get; set; }
public ICommand TestCommand { get; private set; }
public MainWindowViewModel()
{
SomeCollection = new ObservableCollection<string>();
TestCommand = new RelayCommand<object>(CommandMethod);
}
private void CommandMethod(object parameter)
{
SomeCollection.Add("Some dummy string");
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
RelayCommand:
public class RelayCommand<T> : ICommand
{
readonly Action<T> _execute = null;
readonly Predicate<T> _canExecute = null;
public RelayCommand(Action<T> execute)
: this(execute, null)
{
}
public RelayCommand(Action<T> execute, Predicate<T> canExecute)
{
if (execute == null)
throw new ArgumentNullException("execute");
_execute = execute;
_canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
return _canExecute == null ? true : _canExecute((T)parameter);
}
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public void Execute(object parameter)
{
_execute((T)parameter);
}
}
注-我假设您知道如何通过设置DataContext使绑定魔术起作用来将View与ViewModel插入。
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