图片上传并获得图片相对路径保存在数据库中

//判断上传文件是否是图片

        private static bool IsAllowedExtension(FileUpload upfile)

        {

            string strOldFilePath = "";

            string strExtension = "";

            string[] arrExtension = { ".gif", ".jpg", ".bmp", ".png" };

            if (upfile.PostedFile.FileName != string.Empty)

            {

                strOldFilePath = upfile.PostedFile.FileName;//获得文件的完整路径名

                strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//获得文件的扩展名，如：.jpg

                for (int i = 0; i < arrExtension.Length; i++)

                {

                    if (strExtension.Equals(arrExtension[i]))

                    {

                        return true;

                    }

                }

            }

            return false;

        }

        //图片上传并将图片重命名

        protected void FileUpload_Button_Click(object sender, EventArgs e)

        {

            try

            {

                if (FileUpload1.HasFile)

                {

                    if (IsAllowedExtension(FileUpload1))

                    {

                        string filepath = FileUpload1.FileName;

                        //string filename = filepath.Substring(filepath.LastIndexOf('\\') + 1, filepath.Length - filepath.LastIndexOf('\\') - 1);//(filepath.LastIndexOf("\\") + 1);

                        //以年-月-日-时-分-秒-毫米将图片重新命名

                        　　string filename = DateTime.Now.ToString("yyyy-MM-dd-hh-mm-ss-fffffff")+filepath.Substring(filepath.LastIndexOf('.'), filepath.Length - filepath.LastIndexOf('.'));

                        //设定上传路径（绝对路径）

                        　　string uppath = Server.MapPath("~/Photo/") + filename;

                        //图片上传至绝对路径

                        　　FileUpload1.PostedFile.SaveAs(uppath);

                        //设定数据库的存储路径

                        　　string savepath="~\\Photo\\"+filename;

                        HiddenField1.Value = savepath;

                        lblInfo.Text = "上传成功！";

 

                    }

                }

                else

                {

                    lblInfo.Text = "请选择上传文件";

                }

            }

            catch (Exception ex)

            {

                lblInfo.Text = "上传发生错误！原因是：" + ex.ToString();

            }

        }

 

<br>

<br>

 

前台放三个控件

注:

1、FileUpload 控件不能放在UpdatePanel控件内，如果放在UpdatePanel内FileUpload1.HasFile始终为false

2、在给insert语句填充数据时，要使用cmd.Parameters.AddWithValue("@b", savepath);的格式防止字符串savepath中的'\'转义，若使用string sql=string.Format("insert into table1(path) values('{0}')",savepath);的格式，存入数据库的图片路径将会没有'\'。

3、若在图片上传的页面中有验证控件，且不想在单击图片上传按钮的过程中进行验证，需要加上CausesValidation="False"属性。

 

前台代码:

?

<asp:FileUpload ID="FileUpload1" runat="server" Font-Size="13px" BorderColor="Gray" BorderStyle="Solid" BorderWidth="1px" Height="25px" Width="400px"  />

<asp:Button ID="FileUpload_Button" runat="server" Text="上传图片" Height="25px"

      CausesValidation="False" onclick="FileUpload_Button_Click"  />

<asp:Label id="lblInfo" runat="server" ForeColor="Red" Font-Size="13px" ></asp:Label>