C# 图像大小调整：操作已成功完成
大家早上好 我有以下问题：在MVC应用程序中，我创建了一个用于下载图像、缩放等的处理程序。它似乎工作得很好，但有时在事件查看器中我会出现错误，我不知道从哪里开始查找，甚至不知道如何寻找解决方案 错误：“操作已成功完成。”通过实例化“System.Windows.Media.Imaging.JpegBitmapEncoder”发生此错误 更新：代码C# 图像大小调整：操作已成功完成,c#,asp.net-mvc,image-processing,C#,Asp.net Mvc,Image Processing,大家早上好 我有以下问题：在MVC应用程序中，我创建了一个用于下载图像、缩放等的处理程序。它似乎工作得很好，但有时在事件查看器中我会出现错误，我不知道从哪里开始查找，甚至不知道如何寻找解决方案 错误：“操作已成功完成。”通过实例化“System.Windows.Media.Imaging.JpegBitmapEncoder”发生此错误 更新：代码 /// <summary> /// return byte of the resized image /// </summary&g
/// <summary>
/// return byte of the resized image
/// </summary>
/// <param name="bytes">The bytes on original image.</param>
/// <param name="w">desidered width.</param>
/// <param name="h">desired height</param>
/// <param name="maxWidth">The maximum width.</param>
/// <param name="maxHeight">The maximum height.</param>
/// <param name="keepRatio">if set to <c>true</c> mantain ratio.</param>
/// <param name="crop">if set to <c>true</c> crop the resulting image.</param>
/// <param name="backgroudColor">Color of the backgroud.</param>
/// <param name="imageFormat">The image format.</param>
/// <param name="dpi">The dpi.</param>
/// <param name="quality">The quality.</param>
/// <returns></returns>
public static byte[] GetResizedImage(
byte[] bytes
, int? w
, int? h
, int? maxWidth
, int? maxHeight
, bool keepRatio
, bool crop
, string backgroudColor
, string imageFormat
, int dpi = 96
, int quality = 90
)
{
int width = w.HasValue && w > 0 ? w.Value : 0;
int height = h.HasValue && h > 0 ? h.Value : 0;
if (bytes.Length == 0)
{
return bytes;
}
Image img = null;
using (MemoryStream stream = new MemoryStream(bytes))
{
img = Image.FromStream(stream);
}
/* se ho specificato maxwidth o maxwidth, devo verificare se devo fare il resize o meno */
if (maxWidth.HasValue || maxHeight.HasValue)
{
/* verifico se devo fare il resize */
if (
(maxWidth.HasValue && img.Width < maxWidth)
||
(maxHeight.HasValue && img.Height < maxHeight)
)
{
return bytes;
}
else
{
if (maxWidth.HasValue && (maxWidth < width || width <= 0))
{
width = maxWidth.Value;
}
if (maxHeight.HasValue && (maxHeight < height || height <= 0))
{
height = maxHeight.Value;
}
}
}
if (img.IsAnimated())
{
/* prendo il primo frame */
img = img.GetFrame(0);
}
decimal resizeX = width;
decimal resizeY = height;
// Calcolo le dimensioni dell'immagine
/* Se non ho specificato altezza o largnezza, ma il ratio
* calcolo il parametro mancante*/
if (height > 0 & width <= 0 && keepRatio)
{
width = height * img.Width / img.Height;
resizeX = width;
}
else if (width > 0 & height <= 0 && keepRatio)
{
height = width * img.Height / img.Width;
resizeY = height;
}
else
{
/* crop
calcolo quale lato si deve adattare */
if (crop)
{
if ((decimal)img.Width / (decimal)width > (decimal)img.Height / (decimal)height)
{
resizeY = height;
resizeX = resizeY * img.Width / img.Height;
}
else
{
resizeX = width;
resizeY = resizeX * img.Height / img.Width;
}
}
else
{
if ((width * 100 / img.Width) < (height * 100 / img.Height))
{
// Se è più largo
resizeX = width;
resizeY = width * img.Height / img.Width;
}
else
{
// Se è più alto
resizeY = height;
resizeX = height * img.Width / img.Height;
}
}
}
int newW = width;
int newH = height;
if (keepRatio)
{
newW = (int)resizeX;
newH = (int)resizeY;
}
// Disegno l'immagine
using (Bitmap bmp = new Bitmap(width, height))
{
bmp.SetResolution(dpi, dpi);
Color c = Color.White;
if (imageFormat == CONTENT_TYPE_IMAGE_PNG)
{
c = Color.Transparent;
}
using (Graphics gr = Graphics.FromImage(bmp))
{
if (!String.IsNullOrEmpty(backgroudColor))
{
try
{
if (backgroudColor.Substring(0, 1) != "#")
{
backgroudColor = String.Format("#{0}", backgroudColor);
}
c = System.Drawing.ColorTranslator.FromHtml(backgroudColor);
}
catch { }
}
gr.Clear(c);
// Disegno l'immagine centrata
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
//gr.InterpolationMode = InterpolationMode.Bicubic;
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
gr.DrawImage(img, (width - newW) / 2, (height - newH) / 2, newW, newH);
}
// Salvo l'immagine nello stream
try
{
byte[] result = null;
using (MemoryStream m = new MemoryStream())
{
var codec = GetImageCodeInfo(imageFormat);
bmp.Save(m, GetImageCodeInfo(imageFormat), GetEncoderParameters(imageFormat));
result = m.GetBuffer();
}
BitmapEncoder targetEncoder;
if (imageFormat == CONTENT_TYPE_IMAGE_PNG)
{
targetEncoder = new PngBitmapEncoder()
{
};
}
else
{
targetEncoder = new JpegBitmapEncoder
{
QualityLevel = quality
};
}
var frame = ReadBitmapFrame(result);
var resize = FastResize(frame, width, height);
using (var memoryStream = new MemoryStream())
{
targetEncoder.Frames.Add(resize);
targetEncoder.Save(memoryStream);
result = memoryStream.ToArray();
}
targetEncoder = null;
frame = null;
resize = null;
GC.Collect();
GC.WaitForPendingFinalizers();
return result;
}
catch (System.Runtime.InteropServices.ExternalException)
{
//errore generico
//TODO : loggare l'errore
throw;
}
catch
{
throw;
}
}
}
public static BitmapFrame ReadBitmapFrame(byte[] bytes)
{
BitmapFrame result;
using (MemoryStream photoStream = new MemoryStream(bytes))
{
var photoDecoder = BitmapDecoder.Create(
photoStream,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.None);
result = photoDecoder.Frames[0];
}
return result;
}
public static BitmapFrame FastResize(BitmapFrame photo, int width, int height)
{
var target = new TransformedBitmap(
photo,
new System.Windows.Media.ScaleTransform(
width / photo.Width,
height / photo.Height,
0, 0));
return BitmapFrame.Create(target);
}
//
///返回已调整大小的图像的字节
///
///原始图像上的字节数。
///设计宽度。
///理想高度
///最大宽度。
///最大高度。
///如果设置为真mantain比率。
///如果设置为true，则裁剪生成的图像。
///背景的颜色。
///图像格式。
///新闻部。
///质量。
///
公共静态字节[]GetResizedImage(
字节[]字节
，int？w
，int？h
，int？最大宽度
，int？最大高度
，布尔·基普拉蒂奥
，粗粮作物
，字符串背景颜色
，字符串图像格式
，int dpi=96
，整数质量=90
)
{
int width=w.HasValue&&w>0？w.值：0；
int height=h.HasValue&&h>0？h.值：0；
if（bytes.Length==0）
{
返回字节；
}
图像img=null；
使用（内存流=新内存流（字节））
{
img=Image.FromStream（流）；
}
/*指定的最大宽度和最大宽度，数据验证数据的大小和菜单的大小*/
if（maxWidth.HasValue | | maxHeight.HasValue）
{
/*验证设备的价格*/
如果(
（maxWidth.HasValue&&img.Width/// <summary>
/// return byte of the resized image
/// </summary>
/// <param name="bytes">The bytes on original image.</param>
/// <param name="w">desidered width.</param>
/// <param name="h">desired height</param>
/// <param name="maxWidth">The maximum width.</param>
/// <param name="maxHeight">The maximum height.</param>
/// <param name="keepRatio">if set to <c>true</c> mantain ratio.</param>
/// <param name="crop">if set to <c>true</c> crop the resulting image.</param>
/// <param name="backgroudColor">Color of the backgroud.</param>
/// <param name="imageFormat">The image format.</param>
/// <param name="dpi">The dpi.</param>
/// <param name="quality">The quality.</param>
/// <returns></returns>
public static byte[] GetResizedImage(
byte[] bytes
, int? w
, int? h
, int? maxWidth
, int? maxHeight
, bool keepRatio
, bool crop
, string backgroudColor
, string imageFormat
, int dpi = 96
, int quality = 90
)
{
int width = w.HasValue && w > 0 ? w.Value : 0;
int height = h.HasValue && h > 0 ? h.Value : 0;
if (bytes.Length == 0)
{
return bytes;
}
Image img = null;
using (MemoryStream stream = new MemoryStream(bytes))
{
img = Image.FromStream(stream);
}
/* se ho specificato maxwidth o maxwidth, devo verificare se devo fare il resize o meno */
if (maxWidth.HasValue || maxHeight.HasValue)
{
/* verifico se devo fare il resize */
if (
(maxWidth.HasValue && img.Width < maxWidth)
||
(maxHeight.HasValue && img.Height < maxHeight)
)
{
return bytes;
}
else
{
if (maxWidth.HasValue && (maxWidth < width || width <= 0))
{
width = maxWidth.Value;
}
if (maxHeight.HasValue && (maxHeight < height || height <= 0))
{
height = maxHeight.Value;
}
}
}
if (img.IsAnimated())
{
/* prendo il primo frame */
img = img.GetFrame(0);
}
decimal resizeX = width;
decimal resizeY = height;
// Calcolo le dimensioni dell'immagine
/* Se non ho specificato altezza o largnezza, ma il ratio
* calcolo il parametro mancante*/
if (height > 0 & width <= 0 && keepRatio)
{
width = height * img.Width / img.Height;
resizeX = width;
}
else if (width > 0 & height <= 0 && keepRatio)
{
height = width * img.Height / img.Width;
resizeY = height;
}
else
{
/* crop
calcolo quale lato si deve adattare */
if (crop)
{
if ((decimal)img.Width / (decimal)width > (decimal)img.Height / (decimal)height)
{
resizeY = height;
resizeX = resizeY * img.Width / img.Height;
}
else
{
resizeX = width;
resizeY = resizeX * img.Height / img.Width;
}
}
else
{
if ((width * 100 / img.Width) < (height * 100 / img.Height))
{
// Se è più largo
resizeX = width;
resizeY = width * img.Height / img.Width;
}
else
{
// Se è più alto
resizeY = height;
resizeX = height * img.Width / img.Height;
}
}
}
int newW = width;
int newH = height;
if (keepRatio)
{
newW = (int)resizeX;
newH = (int)resizeY;
}
// Disegno l'immagine
using (Bitmap bmp = new Bitmap(width, height))
{
bmp.SetResolution(dpi, dpi);
Color c = Color.White;
if (imageFormat == CONTENT_TYPE_IMAGE_PNG)
{
c = Color.Transparent;
}
using (Graphics gr = Graphics.FromImage(bmp))
{
if (!String.IsNullOrEmpty(backgroudColor))
{
try
{
if (backgroudColor.Substring(0, 1) != "#")
{
backgroudColor = String.Format("#{0}", backgroudColor);
}
c = System.Drawing.ColorTranslator.FromHtml(backgroudColor);
}
catch { }
}
gr.Clear(c);
// Disegno l'immagine centrata
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
//gr.InterpolationMode = InterpolationMode.Bicubic;
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
gr.DrawImage(img, (width - newW) / 2, (height - newH) / 2, newW, newH);
}
// Salvo l'immagine nello stream
try
{
byte[] result = null;
using (MemoryStream m = new MemoryStream())
{
var codec = GetImageCodeInfo(imageFormat);
bmp.Save(m, GetImageCodeInfo(imageFormat), GetEncoderParameters(imageFormat));
result = m.GetBuffer();
}
BitmapEncoder targetEncoder;
if (imageFormat == CONTENT_TYPE_IMAGE_PNG)
{
targetEncoder = new PngBitmapEncoder()
{
};
}
else
{
targetEncoder = new JpegBitmapEncoder
{
QualityLevel = quality
};
}
var frame = ReadBitmapFrame(result);
var resize = FastResize(frame, width, height);
using (var memoryStream = new MemoryStream())
{
targetEncoder.Frames.Add(resize);
targetEncoder.Save(memoryStream);
result = memoryStream.ToArray();
}
targetEncoder = null;
frame = null;
resize = null;
GC.Collect();
GC.WaitForPendingFinalizers();
return result;
}
catch (System.Runtime.InteropServices.ExternalException)
{
//errore generico
//TODO : loggare l'errore
throw;
}
catch
{
throw;
}
}
}
public static BitmapFrame ReadBitmapFrame(byte[] bytes)
{
BitmapFrame result;
using (MemoryStream photoStream = new MemoryStream(bytes))
{
var photoDecoder = BitmapDecoder.Create(
photoStream,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.None);
result = photoDecoder.Frames[0];
}
return result;
}
public static BitmapFrame FastResize(BitmapFrame photo, int width, int height)
{
var target = new TransformedBitmap(
photo,
new System.Windows.Media.ScaleTransform(
width / photo.Width,
height / photo.Height,
0, 0));
return BitmapFrame.Create(target);
}