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时间:2016-02-16 14:48:58

标签: c# list listview win-universal-app

我正在尝试在我的应用中滚动图片,但我无法弄清楚如何填充我的列表。图像使用1.jpg向上的数字命名。如果有人能提供帮助就会很棒。

async private void Exec()
        {
            // Get the file location.
            StorageFolder appFolder = Windows.ApplicationModel.Package.Current.InstalledLocation;
            string myImageFolder = (appFolder.Path + "\\Assets\\Images");
            int imageNumber = 1;

            List<Uri> fileList = new List<Uri>();

            foreach (var fileItem in fileList)
                {
                string imageFileName = imageNumber + ".jpg";
                Uri uri = new Uri(myImageFolder + "/" + imageFileName);
                fileList.Add(uri);
                image.Source = new BitmapImage(new Uri(uri.ToString()));
                await Task.Delay(TimeSpan.FromSeconds(1));
                imageNumber++;
                }
}

更新

我尝试创建一个变通方法并在没有foreach语句的情况下执行此操作,但在测试下一个文件是否存在时崩溃:(

    async private void Exec()

        {
            // Get the file location.
            string root = Windows.ApplicationModel.Package.Current.InstalledLocation.Path;
            string path = root + @"\Assets\Images";
            StorageFolder appFolder = await StorageFolder.GetFolderFromPathAsync(path);

            int imageNumber = 1;
            int test = imageNumber;


            do
            {
                string imageFileName = imageNumber + ".jpg";
                Uri uri = new Uri(path + "\\" + imageFileName);
                image.Source = new BitmapImage(new Uri(uri.ToString()));
                await Task.Delay(TimeSpan.FromSeconds(1));
                test = imageNumber + 1;
                imageNumber++;
                string testFile = test + ".jpg";
                Uri uri1 = new Uri(path + "\\" + testFile);

                if (await appFolder.TryGetItemAsync(uri1.ToString()) != null)
                {
                    test = 99999;
                }
            }
            while (test != 99999);
}

2 个答案:

答案 0 :(得分:2)

您的列表中不包含任何内容。您的foreach永远不会运行,因为列表中没有条目。

您需要遍历myImageFolder-root中的所有路径并将这些uris添加到列表中,然后您可以在foreach中使用它们来为列表中的每个uri创建图像并设置其源。

此外,不需要imageNumber,因为您将拥有URI。

首先通过遍历文件夹来准备URI列表。然后修改现有的foreach以使用它们来构建图像对象。

另外,在迭代它时不要添加到集合中......

答案 1 :(得分:0)

我有这个工作,而且不需要一个foreach:D谢谢@Richard Eriksson

async private void Exec()
        {
            // Get the file location.
            string root = Windows.ApplicationModel.Package.Current.InstalledLocation.Path;
            string path = root + @"\Assets\Images";
            StorageFolder appFolder = await StorageFolder.GetFolderFromPathAsync(path);
            int imageNumber = 1;
            int test = imageNumber;

            do
            {
                string imageFileName = imageNumber + ".jpg";
                Uri uri = new Uri(path + "\\" + imageFileName);
                image.Source = new BitmapImage(new Uri(uri.ToString()));
                await Task.Delay(TimeSpan.FromSeconds(1));
                test = imageNumber + 1;
                imageNumber++;
                string testFile = test + ".jpg";

                if (await appFolder.TryGetItemAsync(testFile) != null)
                {
                    test = 99999;
                }
                else
                {
                    test = 1;
                }
            }
            while (test == 99999);
}