C#上傳附件，以及下載實現

通常情況下，我們會遇到各種上傳附件的情況，以及上傳后需要下載，文檔格式各種各樣，當然這個過程中也是報不同錯誤，還是一個原則，具體問題，具體分析：需求圖：

上傳代碼實現：

 aspx代碼：

<asp:Panel ID="Panel5" runat="server">
                <fieldset>
                    <legend>整體活動效果:</legend>
                    <nav class="navbar navbar-default" role="navigation">
                        <table cellspacing="0" class="table table-hover" border="0" style="border-collapse: collapse;">
                            <tbody>
                                <tr>
                                    <td><strong>需求單名稱</strong></td>
                                    <td colspan="2">
                                        <strong>添加附件</strong>
                                    </td>
                                    <td>附件名稱</td>
                                </tr>
                                <tr>
                                    <td><asp:Literal ID="LtOrder" runat="server"></asp:Literal></td>
                                    <td>
                                      <asp:Button style="margin-right: -55px;" ID="btnImport" runat="server" Text="添加附件" class="btn btn-default" OnClick="btnImport_Click" /></td>
                                    <td class="Up_file">
                                        <asp:FileUpload ID="UpLoadTxt" runat="server" class="form-control" />
                                    </td>
                                    <td>
                                        <asp:Literal ID="LAccessory" runat="server"></asp:Literal>
                                    </td>
                                </tr>
                            </tbody>
                        </table>
                    </nav>
                </fieldset>
            </asp:Panel>

cs代碼：

    #region///上傳，文件名稱添加數據庫，文件保存相應路徑
    /// <summary>
    /// 添加附件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnImport_Click(object sender, EventArgs e)
    {
        string res = "0";
        string fileName = UpLoadTxt.FileName;//獲取要導入的文件名  
        if (fileName == null || fileName == "")
        {
            res = "2";
        }
        else
        {
            string savePath = Server.MapPath("~/UploadFiles/ChatLog/");
            FileOperatpr(fileName, savePath);
            string url = savePath + fileName;
            UpLoadTxt.SaveAs(url);
            SqlConnection conn = SqlHelperEx.ConnOpen("SPSDB");
            string ExtName = getFileExt(fileName).ToUpper();//獲取上傳文件名稱
           // string ENDNmae = getFileEND(fileName).ToUpper(); //后綴名
            id = Request["id"];
            res = GetAccessory(conn, fileName, id);
            SqlHelperEx.ConnClose(conn);
        }
        if (res == "2")
        {
            Response.Write("<script>alert('沒有要添加的文件,請選中文件后再操作!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
        }
        if (res == "0")
        {
            Response.Write("<script>alert('添加失敗!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
        }
        if(res=="1") {
            Response.Write("<script>alert('添加成功!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
        }
        if (res == "3")
        {
            Response.Write("<script>alert('沒有需求單，非法操作!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
        }
    }
    #region 輔助功能
    /// <summary>
    /// 獲取上傳文件的后綴名
    /// </summary>
    /// <param name="fileName"></param>
    /// <returns></returns>
    private string getFileEND(string fileName)
    {
        if (fileName.IndexOf(".") == -1)
            return "";
        string[] temp = fileName.Split('.');
        return temp[temp.Length - 1].ToLower();
    }
    /// <summary>
    /// //獲取上傳文件的名稱
    /// </summary>
    /// <param name="fileName"></param>
    /// <returns></returns>
    private string getFileExt(string fileName)
    {
        if (fileName.IndexOf(".") == -1)
            return "";
        string file = "";
        string[] temp = fileName.Split(new[] { "." }, StringSplitOptions.RemoveEmptyEntries);
        file = temp[0].ToLower();
        return file.ToLower();
    }


    private void FileOperatpr(string fileName, string savePath)
    {
        if (!Directory.Exists(savePath))
        {
            Directory.CreateDirectory(savePath);
        }
        if (File.Exists(savePath + fileName))
        {
            File.Delete(savePath + fileName);
        }
    }

    #endregion

    /// <summary>
    /// 添加文件名
    /// </summary>
    /// <param name="conn"></param>
    /// <param name="filename"></param>
    /// <param name="id"></param>
    private string GetAccessory(SqlConnection conn, string filename, string id)
    {
        string res = "0";
        if (id == "0" || id == "" || id == null)
        {
            res = "3";
        }
        else
        {
            if (filename == null || filename == "")
            {
                res = "2";
            }
            else
            {
                string strOrderID = id;
                string strFileName = filename;
                string strCreateUserId = Session["UserName"].ToString();
                StringBuilder strSql = new StringBuilder();
                // 生成SQL語句;
                strSql.AppendFormat("INSERT INTO BaseSNSAccessory(OrderID,FileName,CreateUserId) values(  {0}", Environment.NewLine);
                strSql.AppendFormat(" @OrderID,@FileName,@CreateUserId) {0}", Environment.NewLine);
                SqlParameter[] parameters = {
                                            new SqlParameter("@OrderID", strOrderID),
                                            new SqlParameter("@FileName", strFileName),
                                            new SqlParameter("@CreateUserId", strCreateUserId),
                                            };
                // 執行
                int result = SqlHelperEx.ExecuteNonQuery(strSql.ToString(), conn, parameters);
                // 返回
                SqlHelperEx.ConnClose(conn);
                if (result == 1)
                {
                    res = "1";
                }
                else
                {
                    res = "0";
                }
            }
        }
        return res;
    }
    #endregion

下載實現：

/// <summary>
    /// 獲取附件
    /// </summary>
    /// <param name="conn"></param>
    /// <param name="id"></param>
    public void GetAccessory(SqlConnection conn, string id)
    {
        string strsql = "SELECT *,(SELECT OrderName FROM  Order_Info WHERE IsValid=1 AND id=bs.OrderID AND IsValid=1) AS OrderName FROM BaseSNSAccessory AS bs WHERE bs.IsValid=1 and bs.OrderID="+id+"  ORDER BY bs.id  DESC";
        DataTable dt = SqlHelperEx.GetDataTable(strsql, conn);
        if (dt.Rows.Count == 0)
        {
            Ltlog.Text = "無數據";
            return;
        }
        string fileName = "";
        string str = "";
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            fileName = dt.Rows[i]["FileName"].ToString();
            str += "<tr height=\"36\" bgcolor=\"#FFFFFF\">";
            str += "<td>" + dt.Rows[i]["OrderName"].ToString() + "</td>";
            str += "<td>  <a href='/EcBossWeb/UploadFiles/ChatLog/" + fileName + "' >點擊下載：" + fileName + "</a></td>";
            str += " </tr>";
        }
        LtOrdersory.Text = str.ToString();

        //string filePath = "";

        //FileStream fs = new FileStream(filePath, FileMode.Open); // 設置文件流,filePath為文件路徑
        //byte[] bytes = new byte[(int)fs.Length];
        //fs.Read(bytes, 0, bytes.Length); // 讀取
        //fs.Close();
        //Response.ClearContent(); // 清楚緩沖區所有內容
        //Response.ClearHeaders(); // 清楚緩沖區所有頭
        //Response.ContentType = "application/octet-stream"; // 設置輸出流的Http MIME類型
        ////通知瀏覽器下載文件而不是打開
        //Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)); //fileName為需要下載的文件名
        //Response.BinaryWrite(bytes); // 寫入輸入流
        //Response.Flush(); // 向客戶端發送數據流
        //Response.End();
    }