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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();
            }
        }
 
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前台放三个控件

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>

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。

更多图片上传问题参考:http://leonardleonard.iteye.com/blog/276213