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  • c#添加水印效果

                           c#添加水印效果

    下面的代码中 添加文字水印 和 图片水印是不能共存的(下面写在一起是为了方便显示)

    代码
    private void Btn_Upload_Click(object sender, System.EventArgs e)
    {
    if(UploadFile.PostedFile.FileName.Trim()!="")
    {
    //上传文件
    string extension = Path.GetExtension(UploadFile.PostedFile.FileName).ToUpper();
    string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();
    string path = Server.MapPath(".") + "/UploadFile/" + fileName + extension;
    UploadFile.PostedFile.SaveAs(path);

    //加文字水印,注意,这里的代码和以下加图片水印的代码不能共存
    System.Drawing.Image image = System.Drawing.Image.FromFile(path);
    Graphics g
    = Graphics.FromImage(image);
    g.DrawImage(image,
    0, 0, image.Width, image.Height);
    Font f
    = new Font("Verdana", 32);
    Brush b
    = new SolidBrush(Color.White);
    string addText = AddText.Value.Trim();
    g.DrawString(addText, f, b,
    10, 10);
    g.Dispose();

    //加图片水印
    System.Drawing.Image image = System.Drawing.Image.FromFile(path);
    System.Drawing.Image copyImage
    = System.Drawing.Image.FromFile( Server.MapPath(".") + "/Alex.gif");
    Graphics g
    = Graphics.FromImage(image);
    g.DrawImage(copyImage,
    new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
    g.Dispose();

    //保存加水印过后的图片,删除原始图片
    string newPath = Server.MapPath(".") + "/UploadFile/" + fileName + "_new" + extension;
    image.Save(newPath);
    image.Dispose();
    if(File.Exists(path))
    {
    File.Delete(path);
    }

    Response.Redirect(newPath);
    }
    }
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  • 原文地址:https://www.cnblogs.com/Mr_JinRui/p/1723137.html
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