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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–MySQLBuilder脚本构建类(select、insert、update、in、带条件的SQL自动生成)
本文链接:https://blog.csdn.net/youcheng_ge/article/details/129179216
C#底层库–MySQL数据库访问操作辅助类(推荐阅读)
本文链接:https://blog.csdn.net/youcheng_ge/article/details/126886379
C#底层库–XML配置参数读写辅助类(推荐阅读)
本文链接:https://blog.csdn.net/youcheng_ge/article/details/129175304
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–FilesHelper文件辅助类(删除目录文件、复制文件到指定目录)
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–随机数生成器
本文链接:https://blog.csdn.net/youcheng_ge/article/details/126888812
C#底层库–RegexHelper正则表达式辅助类
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
C#底层库–Image图片操作类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128805298
C#底层库–JSON帮助类_详细(序列化、反序列化、list、datatable)
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128805705
C#底层库–cookie操作辅助类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128816347
C#底层库–Session操作辅助类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128817096
C#底层库–Image图片操作类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128805298
C#底层库–数据库类型与程序类型转换类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128817610
C#底层库–StringExtension字符串扩展类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/129520428
本专栏为【底层库】,主要介绍编程过程中 通用函数。我们将这些通用固化的源码,进行重写、封装、拓展,再进行单元测试、集成测试、beta测试,最终形成通用化模板,这里我们称为“底层库”。
作为研发人员的你,并不需要花大量时间,研究“底层库”的含义,及“底层库”的实现方法。你只需要几行调用代码,就可以解决项目上碰到的难题。而调用方法、项目样例本文均有介绍,大家有任何问题,可以私信我,如果你对本栏感兴趣关注一下。
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。
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。
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; } } }
我放在了窗体页面,新增一个按钮,点击按钮时触发。
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