使用来自互联网的背景图像创建标准瓷砖答案

【问题标题】：creating standard tiles with background image from internet使用来自互联网的背景图像创建标准瓷砖
【发布时间】：2014-04-25 00:29:53
【问题描述】：

我想用来自直接网站的背景图片创建一个标准，

我在 wp8 中做的很好，但相同的代码在 wp7 中不起作用

下面是代码：

void setTile(string title, string IconPath1x1, string IconPath2x2,
             string IconPath4x2, string IconPath2x2Back, string IconPath4x2Back,
             string wideContent, string targetUri)
{
    StandardTileData Standarddata = new StandardTileData()
    {
            //IconPath2x2 = "http://i.imgur.com/something.png"
            Title = title + "_",
            BackgroundImage = new Uri(IconPath2x2, UriKind.RelativeOrAbsolute),

            BackContent = "",
            BackTitle = title + "_",

            BackBackgroundImage = new Uri(IconPath1x1, UriKind.Absolute)
    };

    ShellTile tiletopin = ShellTile.ActiveTiles.FirstOrDefault(
                          x => x.NavigationUri.ToString().Contains(targetUri));

    if (tiletopin == null)
    {
        ShellTile.Create(
            new Uri(targetUri, UriKind.RelativeOrAbsolute), Standarddata);
    }
}

这个链接我试过了，还是不行

http://blog.safaribooksonline.com/2012/03/20/windows-phone-7-bringing-your-application-tile-to-life/

我错过了什么或者它在 wp7 中不起作用？

【问题讨论】：

标签： c# silverlight windows-phone-7

【解决方案1】：

很遗憾，您需要下载图像并将其保存在本地。然后，您可以从隔离存储中引用图像

string fileName = @"Shared\ShellContent\backgroundTileImage.jpg";
if(TrySaveImage(fileName, "http://foo.com/bar.png"))
{
    Uri uri = new Uri("isostore:/" + fileName, UriKind.Absolute);
    // Create the tile if we didn't find it already exists.
    var tileData = new StandardTileData
    {
        Title = "My Tile",
        BackgroundImage = uri,
    };
}

...
private bool TrySaveImage(string fileName, string url)
{
    using (var store = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
    {
        try
        {
            var backImage = new Image();
            backImage.Height = backImage.Width = 173;
            backImage.Stretch = Stretch.None;
            backImage.Source = new BitmapImage(new Uri(url));
            backImage.Measure(new Size(173, 173));
            backImage.Arrange(new Rect(0, 0, 173, 173));
            var image = new WriteableBitmap(backImage, null);

            string directory = Path.GetDirectoryName(fileName);
            if (!store.DirectoryExists(directory))
            {
                store.CreateDirectory(directory);
            }
            using (var stream = store.OpenFile(fileName, FileMode.OpenOrCreate))
            {
                image.SaveJpeg(stream, 173, 173, 0, 100);
            }
        }
        catch
        {
            return false;
        }
    }
    return true;
}

【讨论】：