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当我创建 GroupedItemsPage 时，它​​有 DataModel/SampleDataSource.cs 例如

但是如何添加从 Internet 加载并使用 Fizzler 修改的内容？

 public sealed class SampleDataSource
  {
    string a = "";
    private static SampleDataSource _sampleDataSource = new SampleDataSource();

    private ObservableCollection<SampleDataGroup> _allGroups = new ObservableCollection<SampleDataGroup>();
    public ObservableCollection<SampleDataGroup> AllGroups
    {
        get { return this._allGroups; }
    }

    public static IEnumerable<SampleDataGroup> GetGroups(string uniqueId)
    {
        if (!uniqueId.Equals("AllGroups")) throw new ArgumentException("Only 'AllGroups' is supported as a collection of groups");

        return _sampleDataSource.AllGroups;
    }

    public static SampleDataGroup GetGroup(string uniqueId)
    {
        // Simple linear search is acceptable for small data sets
        var matches = _sampleDataSource.AllGroups.Where((group) => group.UniqueId.Equals(uniqueId));
        if (matches.Count() == 1) return matches.First();
        return null;
    }

    public static SampleDataItem GetItem(string uniqueId)
    {
        // Simple linear search is acceptable for small data sets
        var matches = _sampleDataSource.AllGroups.SelectMany(group => group.Items).Where((item) => item.UniqueId.Equals(uniqueId));
        if (matches.Count() == 1) return matches.First();
        return null;
    }

    public async Task<string> DownloadStringContent()
    {
        HttpClient client = new HttpClient();
        var response = await client.GetAsync(new Uri("http://www.google.com"));
        var result = await response.RequestMessage.Content.ReadAsStringAsync();

        return result;
    }

    public async void setA()
    {
        a = await DownloadStringContent();
        while (a == "") ;
    }

    public SampleDataSource()
    {
        setA();
        String ITEM_CONTENT = a;
        //String ITEM_CONTENT = String.Format("Item Content: {0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}",
          //          "Curabitur class aliquam vestibulum nam curae maecenas sed integer cras phasellus suspendisse quisque donec dis praesent accumsan bibendum pellentesque condimentum adipiscing etiam consequat vivamus dictumst aliquam duis convallis scelerisque est parturient ullamcorper aliquet fusce suspendisse nunc hac eleifend amet blandit facilisi condimentum commodo scelerisque faucibus aenean ullamcorper ante mauris dignissim consectetuer nullam lorem vestibulum habitant conubia elementum pellentesque morbi facilisis arcu sollicitudin diam cubilia aptent vestibulum auctor eget dapibus pellentesque inceptos leo egestas interdum nulla consectetuer suspendisse adipiscing pellentesque proin lobortis sollicitudin augue elit mus congue fermentum parturient fringilla euismod feugiat");

        var group1 = new SampleDataGroup("Group-1",
                "Group Title: 1",
                "Group Subtitle: 1",
                "Assets/DarkGray.png",
                "Group Description: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus tempor scelerisque lorem in vehicula. Aliquam tincidunt, lacus ut sagittis tristique, turpis massa volutpat augue, eu rutrum ligula ante a ante");
        group1.Items.Add(new SampleDataItem("Group-1-Item-1",
                "Item Title: 1",
                "Item Subtitle: 1",
                "Assets/LightGray.png",
                "Item Description: Pellentesque porta, mauris quis interdum vehicula, urna sapien ultrices velit, nec venenatis dui odio in augue. Cras posuere, enim a cursus convallis, neque turpis malesuada erat, ut adipiscing neque tortor ac erat.",
                ITEM_CONTENT,
                group1));
        group1.Items.Add(new SampleDataItem("Group-1-Item-2",
                "Item Title: 2",
                "Item Subtitle: 2",
                "Assets/DarkGray.png",
                "Item Description: Pellentesque porta, mauris quis interdum vehicula, urna sapien ultrices velit, nec venenatis dui odio in augue. Cras posuere, enim a cursus convallis, neque turpis malesuada erat, ut adipiscing neque tortor ac erat.",
                ITEM_CONTENT,
                group1));
        group1.Items.Add(new SampleDataItem("Group-1-Item-3",
                "Item Title: 3",
                "Item Subtitle: 3",
                "Assets/MediumGray.png",
                "Item Description: Pellentesque porta, mauris quis interdum vehicula, urna sapien ultrices velit, nec venenatis dui odio in augue. Cras posuere, enim a cursus convallis, neque turpis malesuada erat, ut adipiscing neque tortor ac erat.",
                ITEM_CONTENT,
                group1));
        group1.Items.Add(new SampleDataItem("Group-1-Item-4",
                "Item Title: 4",
                "Item Subtitle: 4",
                "Assets/DarkGray.png",
                "Item Description: Pellentesque porta, mauris quis interdum vehicula, urna sapien ultrices velit, nec venenatis dui odio in augue. Cras posuere, enim a cursus convallis, neque turpis malesuada erat, ut adipiscing neque tortor ac erat.",
                ITEM_CONTENT,
                group1));
        group1.Items.Add(new SampleDataItem("Group-1-Item-5",
                "Item Title: 5",
                "Item Subtitle: 5",
                "Assets/MediumGray.png",
                "Item Description: Pellentesque porta, mauris quis interdum vehicula, urna sapien ultrices velit, nec venenatis dui odio in augue. Cras posuere, enim a cursus convallis, neque turpis malesuada erat, ut adipiscing neque tortor ac erat.",
                ITEM_CONTENT,
                group1));
        this.AllGroups.Add(group1);
    }
}

我想通过从 httpclient 下载字符串来修改 SampleDataSource 中的字符串，但是 a 中没有任何内容

我怎么处理这个？请帮帮我

4

1 回答 1

0

也许在 MSDN 文档中阅读核心级别..

Web 服务返回 2 模型方法：

  • 普通法
  • 异步方法

如果要使用异步方法，请在方法中声明标识“异步”子句。如果调用网络服务方法异步并且如果添加“等待”子句：方法等待网络方法响应。在这个时候，不要到达代码行下方。

并且构造函数不支持异步子句。

将您的集合绑定到控件。仍在下载以控制显示。派生您的类 INotifyProperty。

问候。

于 2013-02-23T00:05:55.690 回答