C# 将多个Image 合成为一个,格式可选择

在一些场景中，需要把多个图片，合（拼）成为一张 ，合成效果示例：

纵向：



横向：



代码实现：

enum ImageMergeOrientation
{
Horizontal,
Vertical
}

private void CombineImages(FileInfo[] files, string toPath, ImageMergeOrientation mergeType = ImageMergeOrientation.Vertical)
{
//change the location to store the final image.
var finalImage = toPath;
var imgs = files.Select(f => Image.FromFile(f.FullName));

var finalWidth = mergeType == ImageMergeOrientation.Horizontal ?
imgs.Sum(img => img.Width) :
imgs.Max(img => img.Width);

var finalHeight = mergeType == ImageMergeOrientation.Vertical ?
imgs.Sum(img => img.Height) :
imgs.Max(img => img.Height);

var finalImg = new Bitmap(finalWidth, finalHeight);
Graphics g = Graphics.FromImage(finalImg);
g.Clear(SystemColors.AppWorkspace);

var width = finalWidth;
var height = finalHeight;
var nIndex = 0;
foreach (FileInfo file in files)
{
Image img = Image.FromFile(file.FullName);
if (nIndex == 0)
{
g.DrawImage(img, new Point(0, 0));
nIndex++;
width = img.Width;
height = img.Height;
}
else
{
switch (mergeType)
{
case ImageMergeOrientation.Horizontal:
g.DrawImage(img, new Point(width, 0));
width += img.Width;
break;
case ImageMergeOrientation.Vertical:
g.DrawImage(img, new Point(0, height));
height += img.Height;
break;
default:
throw new ArgumentOutOfRangeException("mergeType");
}
}
img.Dispose();
}
g.Dispose();
finalImg.Save(finalImage, System.Drawing.Imaging.ImageFormat.Tiff);
finalImg.Dispose();
}


代码说明：
根据参数进行横向或纵向合并图片

如果为横向，图片高度为最高的那张；如果纵向则宽度为最宽的那张

UT 代码：

[TestMethod]
public void Combine_Multiple_SampleImages_IntoOne()
{
const string folderPath = "C:\\Users\\Public\\Pictures\\Sample Pictures";
var images = new DirectoryInfo(folderPath).GetFiles("*.jpg", SearchOption.TopDirectoryOnly);

CombineImages(images, "C:/FinalImage_H.tiff");
CombineImages(images, "C:/FinalImage_V.tiff", ImageMergeOrientation.Vertical);
}