按钮单击

时间:2016-11-08 13:59:42

标签: c# windows-phone-8.1 windows-phone-silverlight

我有两个页面:第一页是mainpage.xaml,第二页是favoriteslist.xaml

mainpage.xaml我有一个文本块,它会自动显示一些动态文本。

我在mainpage.xaml上也有一个按钮。

当我点击该按钮时,我想要的是,文本块上显示的文字应该转到favoriteslist.xaml页面中的收藏列表。

如果文本已经收藏,那么文本块上显示的文本应该在按钮点击时从收藏列表中删除。

最后,我需要帮助来实现此功能文本块,该文本块已动态显示,但我只需要知道如何开发add to favorite功能。

正文块:

<TextBlock x:Name="StringTextBlock" Text="" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}" />

按钮:

<Button Grid.Row="2" x:Name="AddToFavoritesButton" 
    Content="Add" Style="{StaticResource ButtonStyle2}" Margin="2"
    Click="AddToFavoritesButton_Click"/>

C#

private void AddToFavoritesButton_Click(object sender, RoutedEventArgs e)
{
}

列表框:

<ListBox x:Name="FavoriteListBox" />

1 个答案:

答案 0 :(得分:1)

我会使用IsolatedStorageSettings存储列表,并在单击按钮时将动态文本与isolatedstoragesettings中的列表进行比较。然后在FavouritesList页面上,将列表框的itemsource设置为IsolatedStorageSettings中的列表。这里是要遵循的步骤: 1.创建模型/类以设置文本块上显示的动态文本

public class favourites
{
    public string myText { get; set; }
}

2。在MainPage.xaml.cs上的按钮单击事件中,如果需要,首先将动态文本(从哪里获取)到文本块,然后创建列表和/或比较

 private void AddToFavoritesButton_Click(object sender, RoutedEventArgs e)
    {
        //your dynamic text set to textblock
        StringTextBlock.Text = myDynamicText;  

        //Set value of your text to member variable of the model/class
        favourites f = new favourites();
        f.myText = myDynamicText;

        IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;

        /*Check if "FavouritesList" key is present in IsolatedStorageSettings
          which means already a list had been added. If yes, retrieve the
          list, compare each item with your dynamic text, add or remove
          accordingly and replace the new list in IsolatedStorageSettings
          with same key. */

        if (settings.Contains("FavouritesList"))
        {
            List<favourites> l = (List<favourites>)settings["FavouritesList"];
            for(int i = 0; i <= l.Count()-1; i++)
            {
                if (l[i].Equals(myDynamicText))
                {
                    l.RemoveAt(i);
                    settings["FavouritesList"] = l;
                }
                else
                {
                    l.Add(f);
                    settings["FavouritesList"] = l;
                }
            }           
        }

        //If no key in IsolatedStorageSettings means no data has been added
        //in list and IsolatedStorageSettings. So add new data

        else
        {
            List<favourites> l = new List<favourites>();
            l.Add(f);
            settings["FavouritesList"] = l;
        }
        settings.Save();
    }       

现在剩下的就是在FavouritesList页面中显示始终更新的列表。我添加了一个'NoData'文本块,当列表中没有任何内容时,该文本块应该是可见的。否则将显示该列表。 在FavouritesList.xaml

 <ListBox x:Name="FavoriteListBox" Visibility="Collapsed">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding myText}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

        <TextBlock Name="NoData" 
                   Text="No Data" 
                   Visibility="Collapsed" 
                   Width="50" 
                   Height="50"/>

在FavouritesList.xaml.cs

 IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
        if (settings.Contains("FavouritesList"))
        {
           List<favourites> l = (List<favourites>)settings["FavouritesList"];
            if(l.Count!= 0)
            {
                NoData.Visibility = System.Windows.Visibility.Collapsed;
                FavoriteListBox.Visibility = System.Windows.Visibility.Visible;
                FavoriteListBox.ItemsSource = l;
            }                  
        }

        else
        {
            FavoriteListBox.Visibility = System.Windows.Visibility.Collapsed;                   
            NoData.Visibility = System.Windows.Visibility.Visible;
        }

我没有测试过这个,但绝对应该有效。希望它有所帮助!