網站後台都需要有上傳圖片的功能，下面的例子就是實現有關圖片上傳。缺點：圖片上傳到本服務器上，不適合大量圖片上傳
第一、圖片上傳，代碼如下： xxx.aspx 代碼如下: <td class="style1"> <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="Button1" runat="server" Text="上傳一般圖片" onclick="Button1_Click" /> </td> <td class="style3"> <asp:Image ID="Image1" runat="server" Height="200px" Width="200px" /> </td> xxx.aspx.cs 代碼如下: protected void Button1_Click(object sender, EventArgs e) { for (int i = 0; i < Request.Files.Count; i++) { HttpPostedFile file = Request.Files[i]; if (file.ContentLength > 0) { if (file.ContentType.Contains("image/")) { using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream)) { string FileName = System.IO.Path.GetFileName(file.FileName); string[] SplitFileName = FileName.Split('.'); string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss")+"." + SplitFileName[1]; img.Save(Server.MapPath("/upload/" + AtterFileName)); this.Image1.ImageUrl = "upload/" + AtterFileName; } } else { Response.Write("<script>alert('該文件不是圖片格式！');</script>"); } } else { Response.Write("<script>alert('請選擇要上傳的圖片');</script>"); } } } 第二、添加文字水印的圖片上傳，代碼如下： xxx.aspx 代碼如下: <td class="style1"> <asp:FileUpload ID="FileUpload2" runat="server" /> <asp:Button ID="Button2" runat="server" Text="上傳文字圖片" onclick="Button2_Click" /> </td> <td> <asp:Image ID="Image2" runat="server" Height="200px" Width="200px" /> </td> xxx.aspx.cs 代碼如下: protected void Button2_Click(object sender, EventArgs e) { for (int i = 0; i < Request.Files.Count; i++) { HttpPostedFile file = Request.Files[i]; if (file.ContentLength > 0) { if (file.ContentType.Contains("image/")) { using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream)) { using (Graphics g = Graphics.FromImage(img)) { g.DrawString("我的圖片", new Font("宋體", 14), Brushes.Red, 0, 0); } string FileName = System.IO.Path.GetFileName(file.FileName); string[] SplitFileName = FileName.Split('.'); string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1]; img.Save(Server.MapPath("/upload/" + AtterFileName)); this.Image2.ImageUrl = "upload/" + AtterFileName; } } else { Response.Write("<script>alert('該文件不是圖片格式！');</script>"); } } else { Response.Write("<script>alert('請選擇要上傳的圖片');</script>"); } } } 第三、添加圖片水印的圖片上傳，代碼如下： xxx.aspx 代碼如下: <td class="style1"> <asp:FileUpload ID="FileUpload3" runat="server" /> <asp:Button ID="Button3" runat="server" Text="上傳水印圖片" onclick="Button3_Click" /> </td> <td> <asp:Image ID="Image3" runat="server" Height="200px" Width="200px" /> </td> xxx.aspx.cs 代碼如下: protected void Button3_Click(object sender, EventArgs e) { for (int i = 0; i < Request.Files.Count; i++) { HttpPostedFile file = Request.Files[i]; if (file.ContentLength > 0) { if (file.ContentType.Contains("image/")) { string fileName = file.FileName; using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream)) { using (System.Drawing.Image imgWater = System.Drawing.Image.FromFile(Server.MapPath("/img/czlogo.jpg"))) { using (Graphics g = Graphics.FromImage(img)) { g.DrawImage(imgWater, 0, 0); } string[] SplitFileName = fileName.Split('.'); string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1]; img.Save(Server.MapPath("/upload/" + AtterFileName)); this.Image3.ImageUrl = "upload/" + AtterFileName; } } } else { Response.Write("<script>alert('該文件不是圖片格式！');</script>"); } } else { Response.Write("<script>alert('請選擇要上傳的圖片');</script>"); } } } 第四、上傳圖片濃縮圖，代碼如下： xxx.aspx 代碼如下: <td class="style1"> <asp:FileUpload ID="FileUpload4" runat="server" /> <asp:Button ID="Button4" runat="server" Text="上傳濃縮圖片" onclick="Button4_Click" /> </td> <td> <asp:Image ID="Image4" runat="server" Height="200px" Width="200px" /> </td> xxx.aspx.cs 代碼如下: protected void Button4_Click(object sender, EventArgs e) { for (int i = 0; i < Request.Files.Count; i++) { HttpPostedFile file = Request.Files[i]; if (file.ContentLength > 0) { if (file.ContentType.Contains("image/")) { using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream)) { using (System.Drawing.Image imgThumb = new Bitmap(200, 100)) { using (Graphics g = Graphics.FromImage(imgThumb)) { g.DrawImage(img, new Rectangle(0, 0, imgThumb.Width, imgThumb.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel); } string fileName = file.FileName; string[] SplitFileName = fileName.Split('.'); string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1]; img.Save(Server.MapPath("/upload/" + AtterFileName)); this.Image4.ImageUrl = "upload/" + AtterFileName; } } } else { Response.Write("<script>alert('該文件不是圖片格式！');</script>"); } } else { Response.Write("<script>alert('請選擇要上傳的圖片');</script>"); } } }
