C# 图像操作

1   Picturebox控件

主要用于显示、保存图形图像信息。其属性及方法如下

2  Bitmap类

3 案例，如图

4 代码如下

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

namespace 图形控件
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string _imageFilePath = string.Empty;
        private void addPicture_Click(object sender, EventArgs e)
        {
            OpenFileDialog file = new OpenFileDialog();
            file.InitialDirectory = ".";
            file.Filter = "所有文件(*.*)|*.*";
            file.ShowDialog();
            if(file.FileName != string.Empty)
            {
                try
                {
                    _imageFilePath = file.FileName;
                    this.pictureBox1.Load(_imageFilePath);
                }
                catch(Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        private void savePictureButton_Click(object sender, EventArgs e)
        {
            SaveFileDialog save = new SaveFileDialog();
            save.ShowDialog();
            if(save.FileName != string.Empty)
            {
                 pictureBox1.Image.Save(save.FileName);
            }
        }

        private void addMarkButton_Click(object sender, EventArgs e)
        {
            try
            {
                Graphics gra = Graphics.FromImage(this.pictureBox1.Image);
                Font font = new Font("隶书", 80, FontStyle.Bold);
                Pen pen = new Pen(Color.OrangeRed);

                gra.DrawString("世界，你好!", font, pen.Brush, 0, 0);
                pen.Dispose();
                gra.Dispose();

                this.pictureBox1.Refresh();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}