C# 文件上传 制作水印

其实C#的文件上传是非常简单的

前台代码

            <asp:FileUpload ID="FileUpload1" accept=".jpg,.png,.jpeg" runat="server" />  //这个就是选择文件类型,当然我这里accept写的是图片的,可以进行修改
            <asp:Button ID="Button1" runat="server" Text="上传" /><br /> //上传按钮
            <asp:Image ID="Image1" runat="server" /> //展示的图片

后台代码

 string path = "UploadsImg/" + DateTime.Now.ToString("yyyyMMddHHmmssms") + FileUpload1.FileName;  // 上传的图片防止重名

        //制作画布，将选中的图片流制作成画布
        System.Drawing.Image img = System.Drawing.Image.FromStream(FileUpload1.FileContent);

        //创建绘制对象，指向到画布上
        Graphics g = Graphics.FromImage(img);
        PointF p = new PointF(10, 20);

        System.Drawing.Image logoimg = System.Drawing.Image.FromFile(Server.MapPath("UploadsImg/logo.png"));

        g.DrawImage(logoimg, p);


        //string s = "WWW.ITNBA.COM";
        //Font f = new Font("微软雅黑", 55);
        //Brush b = new SolidBrush(Color.Red);
        //PointF p = new PointF(10, 20);
        ////绘制
        //g.DrawString(s, f, b, p);

        img.Save(Server.MapPath(path));

        Image1.ImageUrl = path;

        //FileUpload1.SaveAs(Server.MapPath(path));