使用c#下载并保存图像答案

【问题标题】：download and save image using c#使用c#下载并保存图像
【发布时间】：2016-03-18 15:45:48
【问题描述】：

我从 wikipedia api 生成了三张图片。现在我想将它存储在我的当前目录中。使用下面的代码，我可以成功创建带有名称的文件夹。但它只保存一张图像，最后一张。我正在尝试很多。但无法解决如何相应地保存三张图片

      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);

            }

        }
    }
}

【问题讨论】：

标签： c# download save store

【解决方案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();

【讨论】：

【解决方案2】：

您实际上保存了所有图片，但名称相同，这就是为什么文件系统中只保留最后一张（您不断覆盖图像）。您应该在变量路径中使用唯一标识符，以便区分图像，用不同的名称保存它们以避免覆盖

【讨论】：

感谢您的回答。我现在修好了

【解决方案3】：

 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 = url.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]);



          }

       }
    }
 }

【讨论】：