Question

我从维基百科api生成了三张图片。现在我想将它存储在我当前的目录中。使用以下代码，我可以成功创建具有name的文件夹。但它只保存一个图像，最后一个。我很努力。但无法解决如何相应保存三张图像的问题

      public static void Load_Image1(string name1, string name2, string name3,string LocationName)
    {
        var startPath = Application.StartupPath;
        string Imagefolder = Path.Combine(startPath, "Image");
        string subImageFolder = Path.Combine(Imagefolder, LocationName);
        System.IO.Directory.CreateDirectory(subImageFolder);
        //string Jpeg = Path.Combine(Environment.CurrentDirectory, subImageFolder);

        List<PictureBox> pictureBoxes = new List<PictureBox>();
        pictureBoxes.Add(Image1);
        pictureBoxes.Add(Image2);
        pictureBoxes.Add(Image3);

        using (var wc = new System.Net.WebClient())
        {
            var uri = ("https://en.wikipedia.org/w/api.php?action=query&prop=imageinfo&format=json&iiprop=url&iiurlwidth=400&titles="+name1+"|"+name2+"|"+name3);
            var response = wc.DownloadString(new Uri(uri));
            var responseJson = JsonConvert.DeserializeObject<RootObject>(response);

            List<string> urls = new List<string>();
            foreach (KeyValuePair<string, Pageval> entry in responseJson.query.pages)
            {
                var url = entry.Value.imageinfo.First().thumburl;
                urls.Add(url);
                var hash = uri.GetHashCode();
                string Jpeg = Path.Combine(Environment.CurrentDirectory, subImageFolder);
                var path = Path.Combine(Jpeg, hash.ToString("X") + ".jpg");
                wc.DownloadFile(url, path);

            }

            for (int i = 0; i < pictureBoxes.Count; i++)
            {
                Image1.SizeMode = PictureBoxSizeMode.StretchImage;
                Image2.SizeMode = PictureBoxSizeMode.StretchImage;
                Image3.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBoxes[i].Load(urls[i]);

                var hash = uri.GetHashCode();
                string Jpeg = Path.Combine(Environment.CurrentDirectory, subImageFolder);
                var path = Path.Combine(Jpeg, hash.ToString("X") + ".jpg");
                wc.DownloadFile(urls[i], path);

            }

        }
    }
}

Answer 1

您正在将所有图像下载到磁盘上的相同文件名 - 导致前两个图像被最后一个图像覆盖。问题是您的基本文件名基于

var hash = uri.GetHashCode();

这将返回相同的值，因为它基于所有3个图像的url。改为：

var hash = url.GetHashCode();

Answer 2

你实际上保存了所有图片，但名称相同，这就是为什么只有最后一个保留在文件系统中（你会一直覆盖图像）。您应该在变量路径中使用唯一标识符，以便区分图像，使用不同的名称保存它们以避免覆盖

Answer 3

SELECT Ethnicity, COUNT(distinctCard.TransactionID) AS CardUseCount
FROM (SELECT DISTINCT TransactionID, CustomerID FROM TransactionT WHERE CardID <> 1) 
AS distinctCard INNER JOIN CustomerT ON distinctCard.CustomerID = CustomerT.CustomerID
GROUP BY Ethnicity
ORDER BY COUNT(distinctCard.TransactionID) ASC

使用c＃下载并保存图像

3 个答案: