使用asp.net c＃调整图像大小 [英] Resizing image using asp.net c#

问题描述

i编写了一个代码，用于保存原始图像并使用asp.net c＃在数据库中保存已调整大小的图像。

 string imgName = FileUpload1.FileName.ToString（）; 
 //设置图像路径
 string imgPath =〜/ upload /+ imgName; 
 string imgPath2 =〜/ small upload /+ imgName; 
 //获取
 filepath = Server.MapPath（imgPath）; 
 filepath2 = Server.MapPath（imgPath2）; 
 FileUpload1.SaveAs（Server.MapPath（imgPath））; 
 ResizeImage（30，filepath，filepathsmall）; 
 
 
 
 FileStream fs = new FileStream（filepath2，FileMode.Open，FileAccess.Read）; 
 BinaryReader br = new BinaryReader（fs）; 
 Byte [] bytes = br.ReadBytes（（Int32）fs.Length）; 
 br.Close（）; 
 fs.Close（）; 
 string strQuery =INSERT INTO产品（名称，描述，图像，类别，价格，图像路径）VALUES（@NM，@ EM，@ PN，@ CT，@ PC，@ IP）; 
 SqlCommand cmd = new SqlCommand（strQuery）; 
 cmd.Parameters.AddWithValue（@ NM，name）; 
 cmd.Parameters.AddWithValue（@ EM，desc）; 
 cmd.Parameters.AddWithValue（@ PN，bytes）; 
 cmd.Parameters.AddWithValue（@ CT，类别）; 
 cmd.Parameters.AddWithValue（@ PC，价格）; 
 cmd.Parameters.AddWithValue（@ IP，imgPath2）; 
 InsertData（cmd）; 
 
函数
 public static void ResizeImage（int size，string filePath，string saveFilePath）
 {
 //图像尺寸/比例变量
 double newHeight = 0; 
 double newWidth = 0; 
 double scale = 0; 
 
 //创建新图像对象
位图curImage = new Bitmap（filePath）; 
 
 //确定图像缩放
 if（curImage.Height> curImage.Width）
 {
 scale = Convert.ToSingle（size）/ curImage.Height; 
} 
其他
 {
 scale = Convert.ToSingle（size）/ curImage.Width; 
} 
 if（scale< 0 || scale> 1）{scale = 1; } 
 
 //新图像维度
 newHeight = Math.Floor（Convert.ToSingle（curImage.Height）* scale）; 
 newWidth = Math.Floor（Convert.ToSingle（curImage.Width）* scale）; 
 
 //创建新对象图像
 Bitmap newImage = new Bitmap（curImage，Convert.ToInt32（newWidth），Convert.ToInt32（newHeight））; 
 Graphics imgDest = Graphics.FromImage（newImage）; 
 imgDest.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
 imgDest.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; 
 imgDest.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality; 
 imgDest.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 
 ImageCodecInfo [] info = ImageCodecInfo.GetImageEncoders（）; 
 EncoderParameters param = new EncoderParameters（1）; 
 param.Param [0] = new EncoderParameter（System.Drawing.Imaging.Encoder.Quality，100L）; 
 
 //绘制对象图像
 imgDest.DrawImage（curImage，0,0，newImage.Width，newImage.Height）; 
 
 //保存图像文件
 newImage.Save（saveFilePath，info [1]，param）; 
 
 //处理图像对象
 curImage.Dispose（）; 
 newImage.Dispose（）; 
 imgDest.Dispose（）; 
} 

你能告诉我我们应该以哪种格式给出尺寸因子。当我编译时我得到错误

GDI +中发生了一般性错误。

你可以帮我解决这个问题吗？或者建议我另一个代码

解决方案

检查一次......



http://stackoverflow.com/questions/9783999/how-to-resize-image-in-asp-net-with-c-application-in-优化方式 [ ^ ]

试试这个链接：



http://forums.asp.net/t/1851762。 aspx？c + Resize + image +和+ upload + to + db [ ^ ]



使用C＃动态调整图像大小 [ ^ ]

原因

Quote：

当构造Bitmap对象或Image对象时从文件中，文件在对象的生命周期内保持锁定状态。因此，您无法更改图像并将其保存回报价参考

所在的同一文件中

a> [ ^ ]



解决方案，请参阅以下链接：

参考 [ ^ ]

Hi,
i have written a code for saving original image and saving resized image in database using asp.net c#.

 string imgName = FileUpload1.FileName.ToString();
      //sets the image path
        string imgPath = "~/upload/" + imgName;
        string imgPath2 = "~/small upload/" + imgName;
        //get the size in bytes that
        filepath = Server.MapPath(imgPath);
        filepath2 = Server.MapPath(imgPath2);
        FileUpload1.SaveAs(Server.MapPath(imgPath));
        ResizeImage(30,filepath,filepathsmall);



        FileStream fs = new FileStream(filepath2, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        Byte[] bytes = br.ReadBytes((Int32)fs.Length);
        br.Close();
        fs.Close();
        string strQuery = "INSERT INTO products(name, description, image,category,price,imagepath) VALUES(@NM, @EM, @PN,@CT,@PC,@IP)";
        SqlCommand cmd = new SqlCommand(strQuery);
        cmd.Parameters.AddWithValue("@NM", name);
        cmd.Parameters.AddWithValue("@EM", desc);
        cmd.Parameters.AddWithValue("@PN", bytes);
        cmd.Parameters.AddWithValue("@CT", category);
        cmd.Parameters.AddWithValue("@PC", price);
        cmd.Parameters.AddWithValue("@IP", imgPath2);
        InsertData(cmd);

Functions
public static void ResizeImage(int size, string filePath, string saveFilePath)
    {
        //variables for image dimension/scale
        double newHeight = 0;
        double newWidth = 0;
        double scale = 0;

        //create new image object
        Bitmap curImage = new Bitmap(filePath);

        //Determine image scaling
        if (curImage.Height > curImage.Width)
        {
            scale = Convert.ToSingle(size) / curImage.Height;
        }
        else
        {
            scale = Convert.ToSingle(size) / curImage.Width;
        }
        if (scale < 0 || scale > 1) { scale = 1; }

        //New image dimension
        newHeight = Math.Floor(Convert.ToSingle(curImage.Height) * scale);
        newWidth = Math.Floor(Convert.ToSingle(curImage.Width) * scale);

        //Create new object image
        Bitmap newImage = new Bitmap(curImage, Convert.ToInt32(newWidth), Convert.ToInt32(newHeight));
        Graphics imgDest = Graphics.FromImage(newImage);
        imgDest.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        imgDest.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        imgDest.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
        imgDest.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
        EncoderParameters param = new EncoderParameters(1);
        param.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

        //Draw the object image
        imgDest.DrawImage(curImage, 0, 0, newImage.Width, newImage.Height);

        //Save image file
        newImage.Save(saveFilePath, info[1], param);

        //Dispose the image objects
        curImage.Dispose();
        newImage.Dispose();
        imgDest.Dispose();
    }

can you tell me in which format should we give size factor.when i compile i am getting error
A generic error occurred in GDI+.
can you help me solve this eeror or suggest me another code

解决方案

Check it once...

http://stackoverflow.com/questions/9783999/how-to-resize-image-in-asp-net-with-c-application-in-optimizable-way[^]

Try this link:

http://forums.asp.net/t/1851762.aspx?c+Resize+image+and+upload+to+db[^]

Resizing image dynamically using C#[^]

Reason

Quote:

When either a Bitmap object or an Image object is constructed from a file, the file remains locked for the lifetime of the object. As a result, you cannot change an image and save it back to the same file where it originated

from Quote Reference[^]

Solution,refer below link :
Refer[^]

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