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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;

namespace ImgSeparation
{
    public partial class FrmMain : Form
    {
        public FrmMain() {
            InitializeComponent();
        }

        //选择文件
        private void btnFile_Click(object sender, EventArgs e) {
            if (openFile.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
                ImgLoad();
            }
        }

        //写入新的图片分割
        private void ImgLoad() {
            txtFile.Text = openFile.FileName;
            //原图
            FileStream stream = File.OpenRead(txtFile.Text);
            Bitmap btm = new Bitmap(stream);
            //是否去除选中色
            btm.MakeTransparent(chkColor.Checked ? colorDialog.Color : Color.Transparent);
            //释放占用
            stream.Dispose();
            using (Graphics g = Graphics.FromImage(btm)) {
                for (int x = 0; x < txtXCount.Value; x  ) {
                    for (int y = 0; y < txtYCount.Value; y  ) {
                        float w = btm.Width / (float)txtXCount.Value;
                        float h = btm.Height / (float)txtYCount.Value;
                        g.DrawRectangle(Pens.Red, x * w, y * h, w - 1, h - 1);
                    }
                }
                imgShow.Image = btm;
                imgShow.Tag = btm;
            }
        }

        //保存路径
        private void btnSave_Click(object sender, EventArgs e) {
            if (folderBrowser.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
                txtSave.Text = folderBrowser.SelectedPath;
            }
        }

        //分割数改变时
        private void txt_ValueChanged(object sender, EventArgs e) {
            if (!string.IsNullOrEmpty(txtFile.Text))
                ImgLoad();
        }

        //生成分割后的图片
        private void btnOk_Click(object sender, EventArgs e) {
            if (string.IsNullOrEmpty(txtFile.Text) || string.IsNullOrEmpty(txtSave.Text)) {
                MessageBox.Show("路径不可为空！");
                return;
            }
            try {
                //原图
                FileStream stream = File.OpenRead(txtFile.Text);
                Bitmap btm = new Bitmap(stream);
                //释放占用
                stream.Dispose();
                //是否去除选中色
                btm.MakeTransparent(chkColor.Checked ? colorDialog.Color : Color.Transparent);
                //裁剪后图
                int mapw = btm.Width / (int)txtXCount.Value;
                int maph = btm.Height / (int)txtYCount.Value;
                Bitmap map = new Bitmap(mapw, maph);
                using (Graphics g = Graphics.FromImage(map)) {
                    //设置高质量插值法
                    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    //设置高质量绘图
                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    for (int x = 0; x < txtXCount.Value; x  ) {
                        for (int y = 0; y < txtYCount.Value; y  ) {
                            //清空画布并以透明背景色填充
                            g.Clear(Color.Transparent);
                            //裁剪
                            g.DrawImage(btm, new Rectangle(0, 0, mapw, maph), new Rectangle(x * mapw, y * maph, mapw, maph), GraphicsUnit.Pixel);
                            //文件后缀
                            string FileExtension = Path.GetExtension(openFile.FileName);
                            //保存路径
                            string name = txtSave.Text   "\\"   openFile.SafeFileName.Replace(FileExtension, "")   ((x   1) * (y   1))   FileExtension;
                            //保存
                            map.Save(name);
                        }
                    }
                    MessageBox.Show("已成功分割并保存 "   txtXCount.Value * txtYCount.Value   " 张图片！");
                }
            } catch (Exception ex) {
                MessageBox.Show(ex.Message);
            }
        }

        private void btnColor_Click(object sender, EventArgs e) {
            if (colorDialog.ShowDialog() == DialogResult.OK) {
                btnColor.BackColor = colorDialog.Color;
                chkColor_CheckedChanged(null, null);
            }
        }

        //去除选中色
        private void chkColor_CheckedChanged(object sender, EventArgs e) {
            if (imgShow.Tag == null) { return; }
            Bitmap map = (Bitmap)(imgShow.Tag as Bitmap).Clone();
            map.MakeTransparent(chkColor.Checked ? colorDialog.Color : Color.Transparent);
            imgShow.Image = map;
        }
    }
}