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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
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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
C#底层库–Image图片操作类
本文链接:https://blog.csdn.net/youcheng_ge/article/details/128805298
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本文链接:https://blog.csdn.net/youcheng_ge/article/details/128805705
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C#底层库–Session操作辅助类
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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,
WaterMark图片增加水印辅助类。包含:图片水印、文字水印、得到图片的格式。
创建类WaterMark.cs,复制以下代码。
using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;
namespace GYC_Util.Common
{
public class WaterMark
{
///
/// 图片水印
///
/// 图片字节数组
/// 图片扩展名
/// 水印文件相对路径
/// 图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中 9=右下
/// 附加水印图片质量,0-100
/// 水印的透明度 1--10 10为不透明
public static byte[] AddImageSignPic(byte[] byteData, string fileExt, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)
{
MemoryStream memoryStream = new MemoryStream(byteData);
Image img = Image.FromStream(memoryStream);
if (watermarkFilename.StartsWith("/") == false)
{
watermarkFilename = "/" + watermarkFilename;
}
watermarkFilename = Utils.GetMapPath(watermarkFilename);
if (!File.Exists(watermarkFilename))
{
return byteData;
}
Graphics g = Graphics.FromImage(img);
//设置高质量插值法
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = SmoothingMode.AntiAlias;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
Image watermark = new Bitmap(watermarkFilename);
if (watermark.Height >= img.Height || watermark.Width >= img.Width)
{
return byteData;
}
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float transparency = 0.5F;
if (watermarkTransparency >= 1 && watermarkTransparency <= 10)
transparency = (watermarkTransparency / 10.0F);
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, transparency, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (int)(img.Width * (float).01);
ypos = (int)(img.Height * (float).01);
break;
case 2:
xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
ypos = (int)(img.Height * (float).01);
break;
case 3:
xpos = (int)((img.Width * (float).99) - (watermark.Width));
ypos = (int)(img.Height * (float).01);
break;
case 4:
xpos = (int)(img.Width * (float).01);
ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
break;
case 5:
xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
break;
case 6:
xpos = (int)((img.Width * (float).99) - (watermark.Width));
ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
break;
case 7:
xpos = (int)(img.Width * (float).01);
ypos = (int)((img.Height * (float).99) - watermark.Height);
break;
case 8:
xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((img.Height * (float).99) - watermark.Height);
break;
case 9:
xpos = (int)((img.Width * (float).99) - (watermark.Width));
ypos = (int)((img.Height * (float).99) - watermark.Height);
break;
}
g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
ici = codec;
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
quality = 80;
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
try
{
using (MemoryStream ms = new MemoryStream())
{
if (ici != null)
{
img.Save(ms, ici, encoderParams);
}
else
{
img.Save(ms, GetFormat(fileExt));
}
byte[] buffer = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(buffer, 0, buffer.Length);
return buffer;
}
}
finally
{
g.Dispose();
img.Dispose();
watermark.Dispose();
imageAttributes.Dispose();
}
}
///
/// 文字水印
///
/// 图片字节数组
/// 图片扩展名
/// 水印文字
/// 图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中 9=右下
/// 附加水印图片质量,0-100
/// 字体
/// 字体大小
public static byte[] AddImageSignText(byte[] byteData, string fileExt, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize)
{
MemoryStream memoryStream = new MemoryStream(byteData);
Image img = Image.FromStream(memoryStream);
Graphics g = Graphics.FromImage(img);
//设置高质量插值法
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = SmoothingMode.AntiAlias;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = g.MeasureString(watermarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (float)img.Width * (float).01;
ypos = (float)img.Height * (float).01;
break;
case 2:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = (float)img.Height * (float).01;
break;
case 3:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = (float)img.Height * (float).01;
break;
case 4:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
}
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
ici = codec;
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
quality = 80;
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
try
{
using (MemoryStream ms = new MemoryStream())
{
if (ici != null)
{
img.Save(ms, ici, encoderParams);
}
else
{
img.Save(ms, GetFormat(fileExt));
}
byte[] buffer = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(buffer, 0, buffer.Length);
return buffer;
}
}
finally
{
g.Dispose();
img.Dispose();
}
}
///
/// 得到图片的格式
///
private static ImageFormat GetFormat(string ext)
{
switch (ext.ToLower())
{
case "bmp":
return ImageFormat.Bmp;
case "png":
return ImageFormat.Png;
case "gif":
return ImageFormat.Gif;
default:
return ImageFormat.Jpeg;
}
}
}
}
我放在网页的文件上传按钮中,通过文件流上传文件方法。
//如果是图片,检查是否需要打水印
if (IsWaterMark(fileExt) && isWater)
{
switch (SysConfig.Intance.watermarktype)
{
case 1:
byteData = WaterMark.AddImageSignText(byteData, fileExt, SysConfig.Intance.watermarktext, SysConfig.Intance.watermarkposition,
SysConfig.Intance.watermarkimgquality, SysConfig.Intance.watermarkfont, SysConfig.Intance.watermarkfontsize);
break;
case 2:
byteData = WaterMark.AddImageSignPic(byteData, fileExt, SysConfig.Intance.watermarkpic, SysConfig.Intance.watermarkposition,
SysConfig.Intance.watermarkimgquality, SysConfig.Intance.watermarktransparency);
break;
}
}