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UploadImageHelper.cs
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202 lines (187 loc) · 7.89 KB
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/*
* 作用：上传图片处理。
*/
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Web;
namespace Helper.Core.Library
{
public class UploadImageHelper
{
#region 对外公开方法
/// <summary>
/// 保存图片
/// </summary>
/// <param name="httpPostedFile">HttpPostedFileBase 数据</param>
/// <param name="path">保存路径</param>
/// <param name="fileMaxSize">上传文件大小</param>
/// <param name="suffixList">合法后缀列表，例：.rar</param>
/// <param name="serialEnumList">VerifyFormatSerialEnum</param>
/// <returns></returns>
public bool Upload(HttpPostedFileBase httpPostedFile, string path, int fileMaxSize, List<string> suffixList = null, params VerifyFormatSerialEnum[] serialEnumList)
{
if (this.Verify(httpPostedFile, fileMaxSize, suffixList, serialEnumList))
{
try
{
if (File.Exists(path)) File.Delete(path);
httpPostedFile.SaveAs(path);
return true;
}
catch
{
throw;
}
}
return false;
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="httpPostedFile">HttpPostedFileBase 数据</param>
/// <param name="path">保存路径</param>
/// <param name="width">图片宽，当值为 0 时，宽按高的缩放比例生成</param>
/// <param name="height">图片高，当值为 0 时，高按宽的缩放比例生成</param>
/// <param name="fileMaxSize">上传文件大小</param>
/// <param name="logoPath">标志水印地址</param>
/// <param name="left">标志左间距，值小于 0 表示从右开始</param>
/// <param name="top">标志上间距，值小于 0 表示从底开始</param>
/// <param name="suffixList">合法后缀列表，例：.rar</param>
/// <param name="serialEnumList">VerifyFormatSerialEnum</param>
/// <returns></returns>
public bool Upload(HttpPostedFileBase httpPostedFile, string path, int width, int height, int fileMaxSize, string logoPath = "", int left = 0, int top = 0, List<string> suffixList = null, params VerifyFormatSerialEnum[] serialEnumList)
{
if (this.Verify(httpPostedFile, fileMaxSize, suffixList, serialEnumList))
{
Bitmap bitmap = new Bitmap(httpPostedFile.InputStream, true);
bitmap = this.CreateBitmap(bitmap, width, height, logoPath, left, top);
if (bitmap != null)
{
if (File.Exists(path)) File.Delete(path);
bitmap.Save(path);
bitmap.Dispose();
return true;
}
}
return false;
}
#endregion
#region 逻辑处理私有方法
private Bitmap CreateBitmap(Bitmap originalBitmap, int width, int height, string logoPath = "", int left = 0, int top = 0)
{
Graphics graphics = null;
try
{
int originalWidth = originalBitmap.Width;
int originalHeight = originalBitmap.Height;
Bitmap targetBitmap = null;
if ((width == 0 && height == 0) || (originalWidth <= width && originalHeight <= height))
{
// 绘制最终图像
targetBitmap = new Bitmap(originalWidth, originalHeight);
using (graphics = Graphics.FromImage(targetBitmap))
{
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.DrawImage(originalBitmap, 0, 0, originalWidth, originalHeight);
}
}
else
{
int newWidth = width;
int newHeight = height;
if (width == 0)
{
newWidth = (int)Math.Round((decimal)originalBitmap.Width * height / originalBitmap.Height);
}
else if (height == 0)
{
newHeight = (int)Math.Round((decimal)originalBitmap.Height * width / originalBitmap.Width);
}
else
{
if (width * originalBitmap.Height < height * originalBitmap.Width)
{
newHeight = (int)Math.Round((decimal)originalBitmap.Height * width / originalBitmap.Width);
}
else
{
newWidth = (int)Math.Round((decimal)originalBitmap.Width * height / originalBitmap.Height);
}
}
// 按比例生成缩略图
Bitmap newBitmap = new Bitmap(newWidth, newHeight);
using (graphics = Graphics.FromImage(newBitmap))
{
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.FillRectangle(Brushes.White, 0, 0, newWidth, newHeight);
graphics.DrawImage(originalBitmap, 0, 0, newWidth, newHeight);
}
if (width == 0) width = newWidth;
if (height == 0) height = newHeight;
// 绘制最终图像
targetBitmap = new Bitmap(width, height);
using (graphics = Graphics.FromImage(targetBitmap))
{
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.Clear(Color.White);
graphics.DrawImage(newBitmap, 0, 0);
}
}
if(!string.IsNullOrEmpty(logoPath))
{
Bitmap logoBitmap = new Bitmap(Image.FromFile(logoPath));
int posX = 0;
int posY = 0;
if (left >= 0)
{
posX = left;
}
else
{
posX = targetBitmap.Width - logoBitmap.Width + left;
}
if (top >= 0)
{
posY = top;
}
else
{
posY = targetBitmap.Height - logoBitmap.Height + top;
}
using (graphics = Graphics.FromImage(targetBitmap))
{
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.DrawImage(logoBitmap, posX, posY);
}
}
return targetBitmap;
}
catch
{
throw;
}
finally
{
if (graphics != null) graphics.Dispose();
}
}
private bool Verify(HttpPostedFileBase httpPostedFile, int maxSize, List<string> suffixList, params VerifyFormatSerialEnum[] serialEnumList)
{
if (httpPostedFile.ContentLength > maxSize)
{
return false;
}
if (suffixList == null)
{
return UploadVerifyHelper.Verify(httpPostedFile);
}
else
{
return UploadVerifyHelper.Verify(httpPostedFile, suffixList, serialEnumList);
}
}
#endregion
}
}