asp.net图片上传实例

第一、图片上传，代码如下：
xxx.aspx

<td class="style1"> 
 <asp:FileUpload ID="FileUpload1" runat="server" />
 <asp:Button ID="Button1" runat="server" Text="上传一般图片" onclick="Button1_Click" /> 
 </td>
 <td class="style3"> 
 <asp:Image ID="Image1" runat="server" Height="200px" Width="200px" /> 
 </td>

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('该文件不是图片格式！');</script>");
 }
 }
 else
 {
 Response.Write("<script>alert('请选择要上传的图片');</script>");
 }
 }
 }

第二、添加文字水印的图片上传，代码如下：
xxx.aspx

<td class="style1"> 
 <asp:FileUpload ID="FileUpload2" runat="server" />
 <asp:Button ID="Button2" runat="server" Text="上传文字图片" onclick="Button2_Click" /> 
 </td>
 <td> 
 <asp:Image ID="Image2" runat="server" Height="200px" Width="200px" /> 
 </td>

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("我的图片", new Font("宋体", 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('该文件不是图片格式！');</script>");
 }
 }
 else
 {
 Response.Write("<script>alert('请选择要上传的图片');</script>");
 }

 }
 }

第三、添加图片水印的图片上传，代码如下：
xxx.aspx

<td class="style1"> 
 <asp:FileUpload ID="FileUpload3" runat="server" />
 <asp:Button ID="Button3" runat="server" Text="上传水印图片" onclick="Button3_Click" /> 
 </td>
 <td> 
 <asp:Image ID="Image3" runat="server" Height="200px" Width="200px" /> 
 </td>

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('该文件不是图片格式！');</script>");
 }
 }
 else
 {
 Response.Write("<script>alert('请选择要上传的图片');</script>");
 }
 }
 }

<td class="style1"> 
 <asp:FileUpload ID="FileUpload4" runat="server" />
 <asp:Button ID="Button4" runat="server" Text="上传浓缩图片" onclick="Button4_Click" /> 
 </td>
 <td> 
 <asp:Image ID="Image4" runat="server" Height="200px" Width="200px" /> 
 </td>

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('该文件不是图片格式！');</script>");
 }
 }
 else
 {
 Response.Write("<script>alert('请选择要上传的图片');</script>");
 }
 }

 }

本文asp.net图片上传实例到此结束。一个成熟的人握住自已快乐的钥匙，他不期待别人使他快乐，反而能将幸神福与快乐带给别人。小编再次感谢大家对我们的支持！