系列文章
C#底层库–记录日志帮助类
本文链接：https://blog.csdn.net/youcheng_ge/article/details/124187709
C#底层库–数据库访问帮助类（MySQL版）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126886379
C#底层库–获取文件版本和MD5值
本文链接：https://blog.csdn.net/youcheng_ge/article/details/112513871
C#底层库–操作文件帮助类FileHelper（获取目录的所有文件）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126887161
C#底层库–操作Excel帮助类（读取、导出表格）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126887445
C#底层库–软件版本管理XML
本文链接：https://blog.csdn.net/youcheng_ge/article/details/110195766
C#底层库–随机数生成类
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126888812
C#底层库–正则表达式帮助类
本文链接：https://blog.csdn.net/youcheng_ge/article/details/109745286
C#底层库–CSV和DataTable相互转换
本文链接：https://blog.csdn.net/youcheng_ge/article/details/128804367
前言
本专栏为【底层库】，将介绍研发过程中 通用的函数。我们将这些固化的源码，进行重写、规范封装、单元测试、集成测试，从而形成通用化模块库，本专栏称为“底层库”。
作为研发人员的你，并不需要花大量时间，完全掌握“底层库”的含义，你只需要几行调用代码，就可以解决一些项目上碰到的难题。大家有任何问题，可以评论区反馈，私信我。
底层库已实现功能：数据库操作、加解密算法、日志记录、HTTP通信、Socket通信、API前后端交互、邮件发送、文件操作、配置参数存储、Excel导入导出、CSV和DataTable转换、压缩解压、自动编号、Session操作等，
一、底层库介绍
图片处理类。支持生成缩略图、获取网络图片、将图片裁剪成圆形、将图片裁剪成圆形。
二、底层库源码
创建类ImgHelper.cs，复制以下代码。
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
using System.Text;
namespace Geyc_Utils.Commons.Helpers
{
/// <summary>
/// 图片处理
/// </summary>
public class ImgHelper
{
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源文件</param>
/// <param name="thumbnailPath">缩略图</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <param name="mode"></param>
public static void MakeThumbnail(string originalImagePath,
string thumbnailPath,
int width = 120, int height = 90, string mode = "H")
{
Image image = Image.FromFile(originalImagePath);
if (image.Width <= width && image.Height <= height)
{
File.Copy(originalImagePath, thumbnailPath, true);
image.Dispose();
}
else
{
int width2 = image.Width;
int height2 = image.Height;
float num = (float)height / (float)height2;
if ((float)width / (float)width2 < num)
{
num = (float)width / (float)width2;
}
width = (int)((float)width2 * num);
height = (int)((float)height2 * num);
Image image2 = new Bitmap(width, height);
Graphics graphics = Graphics.FromImage(image2);
graphics.Clear(Color.White);
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.DrawImage(image, new Rectangle(0, 0, width, height), new Rectangle(0, 0, width2, height2), GraphicsUnit.Pixel);
EncoderParameters encoderParameters = new EncoderParameters();
EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
encoderParameters.Param[0] = encoderParameter;
ImageCodecInfo[] imageEncoders = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo encoder = null;
int num2 = 0;
while (num2 < imageEncoders.Length)
{
if (!imageEncoders[num2].FormatDescription.Equals("JPEG"))
{
num2++;
continue;
}
encoder = imageEncoders[num2];
break;
}
image2.Save(thumbnailPath, encoder, encoderParameters);
encoderParameters.Dispose();
encoderParameter.Dispose();
image.Dispose();
image2.Dispose();
graphics.Dispose();
}
}
/// <summary>
/// 获取网络图片
/// </summary>
/// <param name="imgUrl"></param>
/// <returns></returns>
public static Bitmap GetNetImg(string imgUrl)
{
try
{
Random random = new Random();
imgUrl = ((!imgUrl.Contains("?")) ? (imgUrl + "?aid=" + random.NextDouble()) : (imgUrl + "&aid=" + random.NextDouble()));
WebRequest webRequest = WebRequest.Create(imgUrl);
WebResponse response = webRequest.GetResponse();
Stream responseStream = response.GetResponseStream();
Image image = Image.FromStream(responseStream);
responseStream.Close();
responseStream.Dispose();
webRequest = null;
response = null;
return (Bitmap)image;
}
catch (Exception ex)
{
Log4NetHelper.Error("获取网络图片错误", ex);
return new Bitmap(100, 100);
}
}
/// <summary>
/// 将图片裁剪成圆形
/// </summary>
/// <param name="img"></param>
/// <param name="rec"></param>
/// <param name="size"></param>
/// <param name="imgSavePath"></param>
/// <returns></returns>
public static Image CutEllipse(Image img, Rectangle rec, Size size, string imgSavePath)
{
Bitmap bitmap = new Bitmap(size.Width, size.Height);
using (Graphics g = Graphics.FromImage(bitmap))
{
using (TextureBrush br = new TextureBrush(img, System.Drawing.Drawing2D.WrapMode.Clamp, rec))
{
br.ScaleTransform(bitmap.Width / (float)rec.Width, bitmap.Height / (float)rec.Height);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.FillEllipse(br, new Rectangle(Point.Empty, size));
}
}
bitmap.Save(imgSavePath, System.Drawing.Imaging.ImageFormat.Png);
return bitmap;
}
/// <summary>
/// 将图片裁剪成圆形
/// </summary>
/// <param name="img"></param>
/// <param name="rec"></param>
/// <param name="size"></param>
/// <returns></returns>
public static Bitmap CutEllipse(Image img, Rectangle rec, Size size)
{
Bitmap bitmap = new Bitmap(size.Width, size.Height);
using (Graphics g = Graphics.FromImage(bitmap))
{
using (TextureBrush br = new TextureBrush(img, System.Drawing.Drawing2D.WrapMode.Clamp, rec))
{
br.ScaleTransform(bitmap.Width / (float)rec.Width, bitmap.Height / (float)rec.Height);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.FillEllipse(br, new Rectangle(Point.Empty, size));
}
}
return bitmap;
}
}
}
三、调用方法
我放在了窗体页面，新增一个按钮，点击按钮时触发。
暂无