C#多张图片合并成一张

【核心代码】

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace PicMerger
{
    class Program
    {
        static void Main(string[] args)
        {
            Bitmap[] maps = new Bitmap[4];
            maps[0] = (Bitmap)Bitmap.FromFile(@"图片合成\1.png");
            maps[1] = (Bitmap)Bitmap.FromFile(@"图片合成\2.png");
            maps[2] = (Bitmap)Bitmap.FromFile(@"图片合成\3.png");
            maps[3] = (Bitmap)Bitmap.FromFile(@"图片合成\4.png");

            MergerImg(maps);
        }

        static void MergerImg(Bitmap[] arrMap)
        {
            //获取图片数组长度
            int len = arrMap.Length;

            if (len == 0)
            {
                return;
            }

            //求数组中最宽图片的宽度
            int maxWidth = 0;
            //计算图片的总数
            int sumHeight = 0;

            for (int i = 0; i < len; i  )
            {
                maxWidth = Math.Max(maxWidth, arrMap[i].Width);
                sumHeight  = arrMap[i].Height;
            }
            //创建一个位图
            Bitmap bgImg = new Bitmap(maxWidth, sumHeight);
            Graphics g = Graphics.FromImage(bgImg);
            //清除画布，背景设置为白色
            g.Clear(Color.White);

            int gHeight = 0;
            for (int i = 0; i < len; i  )
            {
                gHeight = i == 0 ? 0 : gHeight = arrMap[i - 1].Height   gHeight;
                g.DrawImage(arrMap[i], 0, gHeight, arrMap[i].Width, arrMap[i].Height);
            }
            g.Dispose();
            bgImg.Save(@"图片合成\合成结果.png");
        }
    }
}