c# asp.net上传图片并且加上水印

c# winform用子

c#实现web页面打印,

9月10

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15:26Heck

Web开发 From: 本站原创

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;

using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;

/// <summary>
/// FileUpload 的摘要说明
/// </summary>
public class FileUpload
{
  private string BasePath;

public FileUpload()
  {
    //
    // TODO: 在此处添加构造函数逻辑
    //
  }

/// <summary> 
  /// 给图片上水印 
  /// </summary> 
  /// <param name="filePath">原图片地址</param> 
  /// <param name="waterFile">水印图片地址</param> 
  public void MarkWater(string filePath, string waterFile)
  {
    //GIF不水印 
    int i = filePath.LastIndexOf(".");
    string ex = filePath.Substring(i, filePath.Length - i);
    if (string.Compare(ex, ".gif", true) == 0)
    {
      return;
    }

string ModifyImagePath = BasePath + filePath;//修改的图像路径 
    int lucencyPercent = 25;
    Image modifyImage = null;
    Image drawedImage = null;
    Graphics g = null;
    try
    {
      //建立图形对象 
      modifyImage = Image.FromFile(ModifyImagePath, true);
      drawedImage = Image.FromFile(BasePath + waterFile, true);
      g = Graphics.FromImage(modifyImage);
      //获取要绘制图形坐标 
      int x = modifyImage.Width - drawedImage.Width;
      int y = modifyImage.Height - drawedImage.Height;
      //设置颜色矩阵 
      float[][] matrixItems ={ 
new float[] {1, 0, 0, 0, 0}, 
new float[] {0, 1, 0, 0, 0}, 
new float[] {0, 0, 1, 0, 0}, 
new float[] {0, 0, 0, (float)lucencyPercent/100f, 0}, 
new float[] {0, 0, 0, 0, 1}};

ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
      ImageAttributes imgAttr = new ImageAttributes();
      imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
      //绘制阴影图像 
      g.DrawImage(drawedImage, new Rectangle(x, y, drawedImage.Width, drawedImage.Height), 10, 10, drawedImage.Width, drawedImage.Height, GraphicsUnit.Pixel, imgAttr);
      //保存文件 
      string[] allowImageType ={ ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" };
      FileInfo fi = new FileInfo(ModifyImagePath);
      ImageFormat imageType = ImageFormat.Gif;
      switch (fi.Extension.ToLower())
      {
        case ".jpg":
          imageType = ImageFormat.Jpeg;
          break;
        case ".gif":
          imageType = ImageFormat.Gif;
          break;
        case ".png":
          imageType = ImageFormat.Png;
          break;
        case ".bmp":
          imageType = ImageFormat.Bmp;
          break;
        case ".tif":
          imageType = ImageFormat.Tiff;
          break;
        case ".wmf":
          imageType = ImageFormat.Wmf;
          break;
        case ".ico":
          imageType = ImageFormat.Icon;
          break;
        default:
          break;
      }
      MemoryStream ms = new MemoryStream();
      modifyImage.Save(ms, imageType);
      byte[] imgData = ms.ToArray();
      modifyImage.Dispose();
      drawedImage.Dispose();
      g.Dispose();
      FileStream fs = null;
      File.Delete(ModifyImagePath);
      fs = new FileStream(ModifyImagePath, FileMode.Create, FileAccess.Write);
      if (fs != null)
      {
        fs.Write(imgData, 0, imgData.Length);
        fs.Close();
      }
    }
    finally
    {
      try
      {
        drawedImage.Dispose();
        modifyImage.Dispose();
        g.Dispose();
      }
      catch { ;}
    }
  }
}

来源：Heck's Blog
地址：https://www.heckjj.com/csharp-asp-net-pic-upload-mark/
转载时须以链接形式注明作者和原始出处及本声明，否则将追究法律责任，谢谢配合！

Tags: c# , asp.net , 图片 , 水印 , 上传

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