参数无效调用Bitmap.Save（） [英] Parameter is not valid calling Bitmap.Save()

问题描述

这在ASP.NET应用程序。

在当地，这code运行良好，但我们的生产服务器上，它抛出一个异常的参数无效时Bitmap.Save（）被调用。

我应该不会使用System.Drawing.Bitmap，因为它不是在此基础上recommened：

http://msdn.microsoft.com/en-us/库/ system.drawing.aspx

  

不支持使用System.Drawing命名空间中的类   在Windows或ASP.NET服务。   尝试使用这些类的   内的这些应用类型中的一种   可能会产生意想不到的问题，如   为降低服务性能和   运行时异常。

还有什么，我可以用？

 位图MYBITMAP =新位图（IMG）;
myBitmap.SetResolution（img.Horizo​​ntalResolution，img.VerticalResolution）;

//得到TIFF codeC信息
图片codecInfo MYIMAGE codecInfo = GetEn coderInfo（图像/ TIFF）;

//创建基于GUID的COM pression参数类别一间codeR对象
System.Drawing.Imaging.En codeR myEn codeR = System.Drawing.Imaging.En coder.Com pression;

//创建连接code参数
恩coderParameters myEn coderParameters =新恩coderParameters（1）;
恩coderParameter myEn coderParameter =新恩coderParameter（myEn codeR，（长）恩coderValue.Com pressionCCITT4）;
myEn coderParameters.Param [0] = myEn coderParameter;

//保存为TIFF
myBitmap.Save（输入，MYIMAGE codecInfo，myEn coderParameters）;
 

解决方案

我最好的猜测是，该服务器没有安装TIFF codeC。如果您在Windows Server Core上运行此，GDI +是不可用的。

This in in an ASP.NET application.

Locally, this code runs fine, but on our production server, it throws an exception of 'Parameter is not valid' when Bitmap.Save() is called.

Should I not be using System.Drawing.Bitmap because its not recommened based on this:

http://msdn.microsoft.com/en-us/library/system.drawing.aspx

Classes within the System.Drawing namespace are not supported for use within a Windows or ASP.NET service. Attempting to use these classes from within one of these application types may produce unexpected problems, such as diminished service performance and run-time exceptions.

What else could I use?

Bitmap myBitmap = new Bitmap(img);
myBitmap.SetResolution(img.HorizontalResolution, img.VerticalResolution);

// get the tiff codec info
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/tiff");

// Create an Encoder object based on the GUID for the Compression parameter category
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Compression;

// create encode parameters
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.CompressionCCITT4);
myEncoderParameters.Param[0] = myEncoderParameter;

// save as a tiff
myBitmap.Save(input, myImageCodecInfo, myEncoderParameters);

解决方案

My best guess is that the server does not have the tiff codec installed. If you are running this on Windows Server core, GDI+ is not available.

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