c#目录以及子目录下图片批量缩放，像素不变，图像大小改变

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采用多线程，整体效果

图像根目录黏贴或者手工选择，点击开始，进行目录底下图片筛查。采用多线程，点击开始按钮，开启线程，这样UI不会卡住

private void button2_Click(object sender, EventArgs e)
{
var foldPath = textBox1.Text.Trim();
if (string.IsNullOrEmpty(foldPath))
{
return;
}
ImageZoomThread(foldPath);
}

线程方法：

private void ImageZoomThread(string foldPath)
{
ThreadStart threadStart = delegate { listBox1.Items.Clear(); ZoomImage(foldPath); }; Thread thread = new Thread(threadStart); thread.IsBackground = true; thread.Start();
}

缩放图像，核心代码：

private void ZoomImage(string foldPath)
{
DirectoryInfo dir = new DirectoryInfo(foldPath);
FileInfo[] files = dir.GetFiles("*.jpg");
DirectoryInfo[] dii = dir.GetDirectories(); foreach (var file in files)
{
listBox1.Items.Add(file.FullName);
listBox1.SelectedIndex = -1;
ChangeImageSize(file.FullName, file.FullName.Replace(".jpg", "_zoom.jpg"));
} //获取子文件夹内的文件列表，递归遍历
foreach (DirectoryInfo d in dii)
{
ZoomImage(d.FullName);
}
} /// <summary>
/// 压缩图片
/// </summary>
/// <param name="filePath">要压缩的图片的路径</param>
/// <param name="newfilePath">压缩后的图片的路径</param>
public void ChangeImageSize(string filePath, string newfilePath)
{
Bitmap bmp = null;
ImageCodecInfo ici = null;
System.Drawing.Imaging.Encoder ecd = null;
EncoderParameter ept = null;
EncoderParameters eptS = null;
try
{
ici = this.getImageCoderInfo("image/jpeg");
ecd = System.Drawing.Imaging.Encoder.Quality;
eptS = new EncoderParameters(1);
ept = new EncoderParameter(ecd, 35L);
eptS.Param[0] = ept;
if (File.Exists(newfilePath))
{
File.Delete(newfilePath);
}
bmp = new Bitmap(filePath); bmp.Save(newfilePath, ici, eptS);
if (bmp != null)
bmp.Dispose();
ept.Dispose();
eptS.Dispose();
}
catch (Exception ex)
{
//throw new Exception(ex.Message);
}
finally
{ }
} /// <summary>
/// 获取图片编码类型信息
/// </summary>
/// <param name="coderType">编码类型</param>
/// <returns>ImageCodecInfo</returns>
private ImageCodecInfo getImageCoderInfo(string coderType)
{
ImageCodecInfo[] iciS = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo retIci = null;
foreach (ImageCodecInfo ici in iciS)
{
if (ici.MimeType.Equals(coderType))
retIci = ici;
}
return retIci;
}