Question

我使用asp.net mvc4和razor开发了一个Web应用程序。在我的应用程序中，有一个文件上传控件来上传图像并保存在临时位置。

保存图像之前

应重新调整大小到特定大小，然后保存在给定的临时位置。

这是我在控制器类中使用的代码。

public class FileUploadController : Controller
{
    //
    // GET: /FileUpload/

    public ActionResult Index()
    {
        return View();
    }
    public ActionResult FileUpload()
    {
        return View();
    }

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult FileUpload(HttpPostedFileBase uploadFile)
    {
        if (uploadFile.ContentLength > 0)
        {
            string relativePath = "~/img/" + Path.GetFileName(uploadFile.FileName);
            string physicalPath = Server.MapPath(relativePath);


            FileUploadModel.ResizeAndSave(relativePath, uploadFile.FileName, uploadFile.InputStream, uploadFile.ContentLength, true);

            return View((object)relativePath);
        }
        return View();
    }
}

以下是模型类

中使用的代码

public class FileUploadModel
{
    [Required]
    public HttpPostedFileWrapper ImageUploaded { get; set; }

    public static void ResizeAndSave(string savePath, string fileName, Stream imageBuffer, int maxSideSize, bool makeItSquare)
    {
        int newWidth;
        int newHeight;
        Image image = Image.FromStream(imageBuffer);
        int oldWidth = image.Width;
        int oldHeight = image.Height;
        Bitmap newImage;
        if (makeItSquare)
        {
            int smallerSide = oldWidth >= oldHeight ? oldHeight : oldWidth;
            double coeficient = maxSideSize / (double)smallerSide;
            newWidth = Convert.ToInt32(coeficient * oldWidth);
            newHeight = Convert.ToInt32(coeficient * oldHeight);
            Bitmap tempImage = new Bitmap(image, newWidth, newHeight);
            int cropX = (newWidth - maxSideSize) / 2;
            int cropY = (newHeight - maxSideSize) / 2;
            newImage = new Bitmap(maxSideSize, maxSideSize);
            Graphics tempGraphic = Graphics.FromImage(newImage);
            tempGraphic.SmoothingMode = SmoothingMode.AntiAlias;
            tempGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
            tempGraphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
            tempGraphic.DrawImage(tempImage, new Rectangle(0, 0, maxSideSize, maxSideSize), cropX, cropY, maxSideSize, maxSideSize, GraphicsUnit.Pixel);
        }
        else
        {
            int maxSide = oldWidth >= oldHeight ? oldWidth : oldHeight;

            if (maxSide > maxSideSize)
            {
                double coeficient = maxSideSize / (double)maxSide;
                newWidth = Convert.ToInt32(coeficient * oldWidth);
                newHeight = Convert.ToInt32(coeficient * oldHeight);
            }
            else
            {
                newWidth = oldWidth;
                newHeight = oldHeight;
            }
            newImage = new Bitmap(image, newWidth, newHeight);
        }
        newImage.Save(savePath + fileName + ".jpg", ImageFormat.Jpeg);
        image.Dispose();
        newImage.Dispose();
    }
}

但是当我运行应用程序时，会出现 ArgumentException 。

在下面的代码行中“参数无效”

Bitmap tempImage = new Bitmap(image, newWidth, newHeight);

如何在此处传递有效且适当的参数

public static void ResizeAndSave(string savePath, string fileName, Stream imageBuffer, int maxSideSize, bool makeItSquare)

Answer 1

很难理解代码的问题。但也许你想用另类的方式。您需要添加对System.Web.Helpers命名空间的引用，并尝试以下代码。

[HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        WebImage img = new WebImage(file.InputStream);
        if (img.Width > 1000)
            img.Resize(1000, 1000);
        img.Save("path");
        return View();
    }

此课程还支持裁剪，翻转，水印操作等。

如何在c＃中调整大小并保存使用文件上传控件上传的图像

1 个答案: