C# 进行图片压缩的示例代码（对jpg压缩效果最好）
直接上代码
publicstaticclassImageCompress
{
///
///图片压缩
///
///图片文件路径
///保存文件夹
///压缩质量
///压缩后的文件名后缀（防止直接覆盖原文件）
publicstaticvoidCompressionImage(stringimagePath,stringtargetFolder,longquality=100,stringfileSuffix="compress")
{
if(!File.Exists(imagePath))
{
thrownewFileNotFoundException();
}
if(!Directory.Exists(targetFolder))
{
Directory.CreateDirectory(targetFolder);
}
varfileInfo=newFileInfo(imagePath);
varfileName=fileInfo.Name.Replace(fileInfo.Extension,"");
varfileFullName=Path.Combine($"{targetFolder}",$"{fileName}_{fileSuffix}{fileInfo.Extension}");
varimageByte=CompressionImage(imagePath,quality);
varms=newMemoryStream(imageByte);
varimage=Image.FromStream(ms);
image.Save(fileFullName);
ms.Close();
ms.Dispose();
image.Dispose();
}
privatestaticbyte[]CompressionImage(stringimagePath,longquality)
{
using(varfileStream=newFileStream(imagePath,FileMode.Open))
{
using(varimg=Image.FromStream(fileStream))
{
using(varbitmap=newBitmap(img))
{
varcodecInfo=GetEncoder(img.RawFormat);
varmyEncoder=Encoder.Quality;
varmyEncoderParameters=newEncoderParameters(1);
varmyEncoderParameter=newEncoderParameter(myEncoder,quality);
myEncoderParameters.Param[0]=myEncoderParameter;
using(varms=newMemoryStream())
{
bitmap.Save(ms,codecInfo,myEncoderParameters);
myEncoderParameters.Dispose();
myEncoderParameter.Dispose();
returnms.ToArray();
}
}
}
}
}
privatestaticImageCodecInfoGetEncoder(ImageFormatformat)
{
varcodecs=ImageCodecInfo.GetImageDecoders();
returncodecs.FirstOrDefault(codec=>codec.FormatID==format.Guid);
}
}
调用方法（WPF为例）
privatevoidButton_Click(objectsender,RoutedEventArgse)
{
varfileDialog=newOpenFileDialog();
varfileSelect="";
if(fileDialog.ShowDialog(this)==true)
{
fileSelect=fileDialog.FileName;
}
if(string.IsNullOrWhiteSpace(fileSelect))return;
ImageCompress.CompressionImage(fileSelect,@"d:\",50);
}
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