微软的上传、下载代码

自己写的；       

//保存上传图片路径到Cookie
        protected void Button1_Click(object sender, EventArgs e)
        {
            DataTable dt = BLL.Member.ME_MembersInfo.ReturnPhotoCode();
            string PathExtension = "";
            string Path = "";
            Common.Cookie.CookieClear();
            if (FileUpload1.HasFile)
            {
                int filelength = FileUpload1.PostedFile.ContentLength;
                if (filelength > 30720)
                {
                    Common.Alert.Show(this, "上传相片不能大于30KB！");
                    return;
                }
                string filename = System.IO.Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName);
                PathExtension = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName.Trim());
                if (PathExtension.Equals(".jpg"))
                {
                    if (Convert.ToInt32(DateTime.Now.Month) < 10)
                    {
                        Path = "~/upload/" + Convert.ToString(DateTime.Now.Year) + "/0" + Convert.ToString(DateTime.Now.Month);
                    }
                    else
                    {
                        Path = "~/upload/" + Convert.ToString(DateTime.Now.Year) + "/" + Convert.ToString(DateTime.Now.Month);
                    }
                }
                else
                {
                    Common.Alert.Show(this, "请选择.jpg格式");
                    return;
                }
                if (!Directory.Exists(Server.MapPath(Path)))
                {
                    Directory.CreateDirectory(Server.MapPath(Path));
                }
                string SaveSql = Path + "/" + filename.Replace(filename, dt.Rows[0][0].ToString()) + PathExtension;
                Common.Cookie.SetCookie("PQ_Path", SaveSql);
                string Lpath = Server.MapPath(Path) + "/" + filename.Replace(filename, dt.Rows[0][0].ToString()) + PathExtension;
                FileUpload1.PostedFile.SaveAs(Lpath);
                Common.Alert.Show(this, "上传成功");
            }
            else
            {
                Common.Alert.Show(this,"请选择.jpg图片");
                return;
            }
        }

 

 

 

 

网上找的，值得参考下；

Boolean fileOk = false;
        string path = Server.MapPath("~/upload/");
        if (FileUpload1.HasFile)
        {
           
            //获取扩展名
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            //限定只能上传jpg和gif图片
            string[] allowExtension = { ".jpg", ".gif", ".jpeg", ".bmp" };
            for (int i = 0; i < allowExtension.Length; i++)
            {
                if (fileExtension == allowExtension[i])
                {
                    fileOk = true;
                    break;
                }
            }
            if (fileOk == false)
            {
                ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, this.GetType(), "提示!", "alert('文件类型错误!');", true);
            }
            //对上传文件的大小进行检测，限定文件最大不超过1M
            if (FileUpload1.PostedFile.ContentLength > 1024000)
            {
                fileOk = false;
            }

             if (fileOk)
            {
                try
                {
                    string pat = path + ReName(fileExtension);
                    ct.CardImage ="upload/" + ReName(fileExtension);
                    B2CBll.CardTypeManager.AddCardType(ct);
                    FileUpload1.PostedFile.SaveAs(pat);
                    ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, this.GetType(), "提示!", "alert('添加成功!');", true);
                    this.BindListBox();
                }
                catch
                {

                    ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, this.GetType(), "提示!", "alert('上传失败!');", true);
                }
            }
            else
            {
                ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, this.GetType(), "提示!", "alert('文件类型或者文件大小超出1M或者文件类型不对');", true);

            }


        }
    }

 

protected void BtnFileUpload_Click(object sender, EventArgs e)
        {
            DataTable dt = getCode();
            if (FileUpload1.HasFile)
            {
                bool test = false;
                string path = "";
                string fullPath = "";
                string fileName = System.IO.Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName);
                string filexls = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName);
                double fileLenght = (Convert.ToDouble(FileUpload1.PostedFile.ContentLength) / Convert.ToDouble(1024));
                
                string[] strs = { ".jpg", ".jpeg", ".gif", ".rar", ".txt", ".bng", ".doc" };
                for (int i = 0; i < strs.Length; i++)
                {
                    if (filexls.ToLower() == strs[i].ToLower())
                    {
                        test = true;
                        break;
                    }
                }
                if (test)
                {
                    try
                    {
                        path = "~/upload/" + DateTime.Now.Year + "/" + DateTime.Now.Month;
                        fullPath = Server.MapPath(path);
                        if (!Directory.Exists(fullPath))
                        {
                            Directory.CreateDirectory(fullPath);
                        }
                        fullPath = Server.MapPath(path) + "/" + fileName.Replace(fileName, dt.Rows[0][0].ToString()) + filexls;
                        path = "~/upload/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + fileName.Replace(fileName, dt.Rows[0][0].ToString()) + filexls;
                        setCookie("filename", fileName);
                        setCookie("filexls", filexls);
                        setCookie("fileLength", fileLenght.ToString());
                        setCookie("Path", path);
                        FileUpload1.PostedFile.SaveAs(fullPath);
                        AddPhotoTest();
                        GetPhototest();
                    }
                    catch (Exception ex)
                    {
                        ScriptManager.RegisterClientScriptBlock(FileUpload1, GetType(), "提示", "alert('上传文件出现异常');", true);
                        return;
                    }
                }
                else
                {
                    ScriptManager.RegisterClientScriptBlock(FileUpload1, GetType(), "提示", "alert('上传文件不支持此格式');", true);
                    return;
                }
                ScriptManager.RegisterClientScriptBlock(FileUpload1, GetType(), "提示", "alert('上传成功');", true);
            }
            else
            {
                ScriptManager.RegisterClientScriptBlock(FileUpload1, GetType(), "提示信息", "alert('请选择上传文件');", true);
                return;
            }

        }

 

本段代码资料来源（百度知道）：

资料来源：http://zhidao.baidu.com/question/111503334.html

 

 

 

求asp.net文件上传下载代码，不需要写那么详细（本人不是菜鸟，给出关键步骤，但贴到工程里就可以使用才行），我写的最大只能上传4M，不知道为什么
   要求至少可以上传200M，自己试过了再发上来

Web.Config

<!--文件上传的大小限制：200M（200000KB），执行最大时限是100分钟（6000秒）-->
<httpRuntime maxRequestLength="200000" executionTimeout="6000"/>

本段代码资料来源（百度知道）：

资料来源：http://zhidao.baidu.com/question/111503334.html