发一些自己最常用的C#函数（二) :上传图片处理
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内容图文
using
System;
using
System.Drawing;
using
System.Drawing.Drawing2D;
using
System.Drawing.Imaging;
namespace
ZooleeBasic
{
public
class
ZImage
{
private
static
readonly
string[] ImageFileExtensions = { ".bmp", ".gif", ".jpg", ".jpeg", ".png" };
privatestaticreadonly ImageFormat[] ImageFormats = { ImageFormat.Bmp, ImageFormat.Gif, ImageFormat.Jpeg, ImageFormat.Jpeg, ImageFormat.Png };
///<summary>/// 缩放模式
///</summary>publicenum ResizeMod
{
定宽定高简单缩放 = 1,
定宽等比例缩放 = 2,
定高等比例缩放 = 3,
定宽定高等比例缩放 = 4
}
///<summary>/// 水印位置
///</summary>publicenum WatermarkPosition
{
左上 = 1,
左中 = 2,
左下 = 3,
中上 = 4,
正中 = 5,
中下 = 6,
右上 = 7,
右中 = 8,
右下 = 9
}
///<summary>/// 是否图像文件
///</summary>///<param name="filePath">文件的物理路径</param>///<returns></returns>publicstaticbool IsImageFile(string filePath)
{
string ext = ZFile.GetFileExtension(filePath);
if(ZString.IsInArray(ext,ImageFileExtensions,false)){returntrue;}
returnfalse;
}
///<summary>/// 获得一个文件的图像文件格式（非图像文件返回null）
///</summary>///<param name="filePath">文件的物理路径</param>///<returns>返回图像文件格式</returns>publicstatic ImageFormat GetImageFormat(string filePath)
{
string ext = ZFile.GetFileExtension(filePath);
int id = ZString.GetIDInArray(ext, ImageFileExtensions, false);
if (id < 0) { returnnull; }
return ImageFormats[id];
}
///<summary>/// 缩放图像文件
///</summary>///<param name="oFilePath">源文件的物理路径</param>///<param name="toFilePath">新文件的物理路径</param>///<param name="toWidth">新的图像宽度</param>///<param name="toHeight">新的图像高度</param>///<param name="resizeMod">缩放模式</param>publicstaticvoid Resize(string oFilePath, string toFilePath, int toWidth, int toHeight, ResizeMod resizeMod)
{
if(!IsImageFile(oFilePath)){ return; }
Image oImage = Image.FromFile(oFilePath);
int ow = oImage.Width;
int oh = oImage.Height;
int tow = toWidth;
int toh = toHeight;
int x = 0;
int y = 0;
switch (resizeMod)
{
case ResizeMod.定宽定高简单缩放:
break;
case ResizeMod.定宽等比例缩放:
toh = oImage.Height * toWidth / oImage.Width;
break;
case ResizeMod.定高等比例缩放:
tow = oImage.Width * toHeight / oImage.Height;
break;
case ResizeMod.定宽定高等比例缩放:
if ((double)oImage.Width / (double)oImage.Height > (double)tow / (double)toh)
{
oh = oImage.Height;
ow = oImage.Height * tow / toh;
y = 0;
x = (oImage.Width - ow) / 2;
}
else
{
ow = oImage.Width;
oh = oImage.Width * toHeight / tow;
x = 0;
y = (oImage.Height - oh) / 2;
}
break;
default:
break;
}
Image bitmap = new Bitmap(tow, toh);//新建一个bmp图片
Graphics g = Graphics.FromImage(bitmap);//新建一个画板
g.InterpolationMode = InterpolationMode.High;//设置高质量插值法
g.SmoothingMode = SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
g.Clear(System.Drawing.Color.Transparent);//清空画布并以透明背景色填充
g.DrawImage(oImage, new Rectangle(0, 0, tow, toh), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);//在指定位置并且按指定大小绘制原图片的指定部分try
{
ZFile.CreateDirectory(ZFile.GetFileDiretory(toFilePath));
bitmap.Save(toFilePath, GetImageFormat(oFilePath));//以原图片格式保存缩放图 }
catch (System.Exception e)
{
throw e;
}
finally
{
oImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
///<summary>/// 加图片水印
///</summary>///<param name="oFilePath">源文件的物理路径</param>///<param name="toFilePath">新文件的物理路径</param>///<param name="watermarkPath">水印图片的物理路径</param>///<param name="watermarkPosition">水印位置</param>publicstaticvoid ImageWatermark(string oFilePath, string toFilePath, string watermarkPath, WatermarkPosition watermarkPosition)
{
string ext = ZFile.GetFileExtension(oFilePath);
if (!ZString.IsInArray(ext, ImageFileExtensions, false)) { return; }
int x = 0;
int y = 0;
Image img = Bitmap.FromFile(oFilePath);
Image waterimg = Image.FromFile(watermarkPath);
switch(watermarkPosition)
{
case WatermarkPosition.左上:
x=10;
y=10;
break;
case WatermarkPosition.左中:
x = 10;
y = img.Height / 2 - waterimg.Height / 2;
break;
case WatermarkPosition.左下:
x = 10;
y = img.Height - waterimg.Height - 10;
break;
case WatermarkPosition.中上:
x = img.Width / 2 - waterimg.Width / 2;
y = 10;
break;
case WatermarkPosition.正中:
x = img.Width / 2 - waterimg.Width / 2;
y = img.Height / 2 - waterimg.Height / 2;
break;
case WatermarkPosition.中下:
x = img.Width / 2 - waterimg.Width / 2;
y = img.Height - waterimg.Height -10;
break;
case WatermarkPosition.右上:
x = img.Width - waterimg.Width - 10;
y = 10;
break;
case WatermarkPosition.右中:
x = img.Width - waterimg.Width - 10;
y = img.Height / 2 - waterimg.Height / 2;
break;
case WatermarkPosition.右下:
x = img.Width - waterimg.Width - 10;
y = img.Height - waterimg.Height - 10;
break;
default:
break;
}
Graphics g = Graphics.FromImage(img);
g.DrawImage(waterimg, new Rectangle(x, y, waterimg.Width, waterimg.Height));
try
{
ZFile.CreateDirectory(ZFile.GetFileDiretory(toFilePath));
img.Save(toFilePath, GetImageFormat(oFilePath));
}
catch (Exception)
{
throw;
}
finally
{
waterimg.Dispose();
img.Dispose();
g.Dispose();
}
}
///<summary>/// 加文字水印
///</summary>///<param name="oFilePath">源文件的物理路径</param>///<param name="toFilePath">新文件的物理路径</param>///<param name="letter">水印文字</param>///<param name="font">水印文字的文本格式</param>///<param name="brush">水印文字的画刷</param>///<param name="watermarkPosition">水印位置</param>publicstaticvoid LetterWatermark(string oFilePath, string toFilePath, string letter, Font font, Brush brush, WatermarkPosition watermarkPosition)
{
string ext = ZFile.GetFileExtension(oFilePath);
if (!ZString.IsInArray(ext, ImageFileExtensions, false)) { return; }
float x = 0;
float y = 0;
Image img = Bitmap.FromFile(oFilePath);
float len = ZString.GetStringLength(letter);
float size = font.GetHeight();
float letterLength = len * size;
float letterHeight = size;
switch (watermarkPosition)
{
case WatermarkPosition.左上:
x = 10;
y = 10;
break;
case WatermarkPosition.左中:
x = 10;
y = img.Height / 2 - letterHeight / 2;
break;
case WatermarkPosition.左下:
x = 10;
y = img.Height - letterHeight - 10;
break;
case WatermarkPosition.中上:
x = img.Width / 2 - letterLength / 2;
y = 10;
break;
case WatermarkPosition.正中:
x = img.Width / 2 - letterLength / 2;
y = img.Height / 2 - letterHeight / 2;
break;
case WatermarkPosition.中下:
x = img.Width / 2 - letterLength / 2;
y = img.Height - letterHeight - 10;
break;
case WatermarkPosition.右上:
x = img.Width - letterLength - 10;
y = 10;
break;
case WatermarkPosition.右中:
x = img.Width - letterLength - 10;
y = img.Height / 2 - letterHeight / 2;
break;
case WatermarkPosition.右下:
x = img.Width - letterLength - 10;
y = img.Height - letterHeight - 10;
break;
default:
break;
}
Graphics g = Graphics.FromImage(img);
g.DrawString(letter, font, brush, x, y);
try
{
ZFile.CreateDirectory(ZFile.GetFileDiretory(toFilePath));
img.Save(toFilePath, GetImageFormat(oFilePath));
}
catch (Exception)
{
throw;
}
finally
{
img.Dispose();
g.Dispose();
brush.Dispose();
font.Dispose();
}
}
}
}
原文：http://www.cnblogs.com/apollosun123/p/3639591.html
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