FileUpload选择图片并上传

在上传按钮的事件里：

//文件上传

        protected void btn_Click(object sender, EventArgs e)

        {

 

            if (FileUpload1.HasFile)//判断是否存在文件

            {

                string FilePath = Server.MapPath("/Images/");//获取图像存的路径

                string Extension = Path.GetExtension(FileUpload1.PostedFile.FileName);//获取文件的类型

                if (Extension == ".jpg" || Extension == ".png" || Extension == ".jif")//判断格式               {

                    string NewFilePath = DateTime.Now.ToString("yyyyMMddHHmmss") + Extension;//重命名图片

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                    FileUpload1.SaveAs(FilePath + NewFilePath);//图片存到对应路径

                    string ImgPath = "../Images/" + NewFilePath;

                    //Image1.ImageUrl = "../Images/" + FileUpload1.FileName;

                    Image1.ImageUrl = ImgPath;//图片显示

                    return;

                }

                else

                {

                    this.Page.ClientScript.RegisterStartupScript(Page.GetType(), "提示！", "<script>alert('请选择图片格式！')</script>");

                }

            }

        }