发布于 2016-06-23 03:24:12 | 142 次阅读 | 评论: 0 | 来源: 网友投递

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ASP.NET

ASP.NET 是.NET FrameWork的一部分,是一项微软公司的技术,是一种使嵌入网页中的脚本可由因特网服务器执行的服务器端脚本技术,它可以在通过HTTP请求文档时再在Web服务器上动态创建它们。 指 Active Server Pages(动态服务器页面) ,运行于 IIS(Internet Information Server 服务,是Windows开发的Web服务器)之中的程序 。


这篇文章主要介绍了进度条在.net导入Excel时的应用,以实例形式讲述了.net导入Excel时根据页面情况显示进度条的实现方法,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了进度条在.net导入Excel时的应用,分享给大家供大家参考。具体实现方法如下:

在程序开发过程中,往往会涉及到将Excel表格导入到数据库中的需求,而当excel表格内容很多的时候,我们往往会很难去捕捉它的执行过程进度和一些错误信息,此时我们便可以通过以下方法去解决这些难题,具体实现过程分析如下:

一、建立一个web应用程序,在程序中首先创建一个html文件命名为ProgressBar,文件内容如下:

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title></title>

<script type="text/javascript">

    //开始处理

    function BeginTrans(msg) {

        WriteText(msg);

    }

    //设置进度条进度

    function SetPorgressBar(msg, pos) {

        ProgressBar.style.width = pos + "%";

        WriteText(msg + " 已完成" + pos + "%");

    }

    //处理结束

    function EndTrans(msg) {

        if (msg == "")

            WriteText("完成。");

        else

            WriteText(msg);

    }

    //设置时间信息

    function SetTimeInfo(msg) {

        WriteText(msg);

    }

    // 更新文本显示信息

    function WriteText(str) {

        var strTag = '<font face="Verdana, Arial, Helvetica" size="2" color="#ea9b02"><B>' + str + '</B></font>';

        document.getElementById("Msg2").innerHTML = strTag;

    }

</script>

</head>

<body>

<table align="center" style="height:100%">

    <tr style="height:45%"><td></td></tr>

    <tr>

        <td>

            <div id="ProgressBarSide" style="width:300px; color:Silver;border-width:1px; border-style:Solid;">

                <div id="ProgressBar" align="center" style="height:20px; width:0%; background-color:#316AC5;"></div>

            </div>

        </td>

        <td>

        <div id="Msg2" style="height:16px;"></div>

        </td>

    </tr>

    <tr style="height:50%"><td></td></tr>

</table>

</body>

</html>

二、创建一个aspx页面,前后端代码分别如下:
//1.这里为了简便,我只写出了前端页面中的body体部分供参考:

<form id="forms" runat = "server">

<table align="center" style="height:100%">

    <tr style="height:45%"><td></td></tr>

<tr>

       <td align="center" style="height: 24px; width: 100px;"> Excel文件</td>

       <td style="height: 24px">

       <asp:FileUpload ID="fuGlossaryXls" runat="server"/>

       <asp:Label ID="Label2" runat="server" Font-Bold="True" ForeColor="Red" Text="不能为空"

                                                    Visible="False"></asp:Label></td>

                                                    <td>

        <asp:Button ID="Button1" runat="server" CssClass="mybotton" Text="导入" Width="60px" onclick="Button1_Click"/></td>

</tr>

</table>

</form>

//2.后端部分代码如下:

 //这里是激发导入按钮点击事件

        protected void Button1_Click(object sender, EventArgs e)

        {

            string cfilename = this.fuGlossaryXls.FileName;//获取准备导入的文件名称

            if (cfilename == "")

            {

                Label2.Visible = true;

                return;

            }

            else

            {

                Label2.Visible = false;

            }

            //////////////显示进度/////////////////////////////////////////////////////////////////////////////

            DateTime startTime = System.DateTime.Now;

            DateTime endTime = System.DateTime.Now;

            // 根据 ProgressBar.htm 显示进度条界面
            string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
            StreamReader reader = new StreamReader(@templateFileName, System.Text.Encoding.GetEncoding("gb2312"));
            string html = reader.ReadToEnd();
            reader.Close();
            Response.Write(html);
            Response.Flush();
            System.Threading.Thread.Sleep(1000);

            string jsBlock;
            // 处理完成
            jsBlock = "<script>BeginTrans('正在加载数据,请耐心等待...');</script>";
            Response.Write(jsBlock);
            Response.Flush();

             string fileName = fuGlossaryXls.PostedFile.FileName.Substring(fuGlossaryXls.PostedFile.FileName.LastIndexOf("\\") + 1);//获取准备导入文件的文件名
             string suffix = fileName.Substring(fileName.LastIndexOf(".") + 1);//获取准备导入文件的后缀名
            
             System.Threading.Thread.Sleep(200);

             int maxrows = 0;//用来记录需要加载的数据总行数
             bool err = false;//用来记录加载状态
             int errcount = 0;//用来记录加载错误行数
             if (fuGlossaryXls.HasFile)//判断当前是否有选取文件
             {
                 if (suffix == "xlsx")
                 {
                     DataTable dt = ExcelImport(fileName);
                     for (int i = 0; i < dt.Rows.Count; i++)
                     {
                         maxrows++;
                     }
                     //////////拓展////////////////////////////////////////////////////////
                     //DataView myView = new DataView(dt);
                     //myView.RowFilter = "name is not null";
                     //int t = myView.Count;//获取满足RowFilter 条件的数据行
                     //////////拓展////////////////////////////////////////////////////////
                     string sqlconnect = "Data Source=.;Initial Catalog=test;User ID=sa;Password=123456;";//本地数据库链接
                     SqlConnection conn = new SqlConnection(sqlconnect);
                     SqlTransaction myTrans = null;
                     try
                     {
                         SqlCommand cmd = new SqlCommand(null, conn);
                         conn.Open();
                         myTrans = conn.BeginTransaction();
                         cmd.Transaction = myTrans;
                         cmd.CommandText = "delete from test";
                         cmd.ExecuteNonQuery();//首先执行清除表内容操作
                         for (int j = 0; j < dt.Rows.Count; j++)//循环向数据库中插入excel数据
                         {
                             if (string.IsNullOrEmpty(dt.Rows[j][0].ToString()))
                             {
                                 jsBlock = "<script>EndTrans('第" + j.ToString() + "行数据写入错误。');</script>";
                                 Response.Write(jsBlock);
                                 Response.Flush();
                                 err = true;
                                 errcount++;
                             }
                             else
                             {
                                 cmd.CommandText = string.Format("insert into test values('{0}','{1}','{2}','{3}')", dt.Rows[j][0], dt.Rows[j][1], dt.Rows[j][2], dt.Rows[j][3]);
                                 cmd.ExecuteNonQuery();//逐行向表中插入数据,注意字段的对应
                             }
                             System.Threading.Thread.Sleep(1000);
                             float cposf = 0;
                             cposf = 100 * (j + 1) / maxrows;
                             int cpos = (int)cposf;
                             jsBlock = "<script>SetPorgressBar('已加载到第" + (j + 1).ToString() + "条','" + cpos.ToString() + "');</script>";
                             Response.Write(jsBlock);
                             Response.Flush();
                         }
                         myTrans.Commit();//提交
                     }
                     catch (Exception ex)
                     {
                         myTrans.Rollback();//回滚
                         ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('" + ex.Message + "');</script>");
                     }
                     finally
                     {
                         conn.Dispose();
                         conn.Close();//关闭数据库连接
                     }
                 }
                 else
                 {
                     ClientScript.RegisterStartupScript(GetType(), "", "alert('请选择Excel文件!');", true);
                 }
             }
             else
             {
                 ClientScript.RegisterStartupScript(GetType(), "", "alert('请选择要导入的Excel!');", true);
             }
             if (!err)//加载中并没有出现错误
             {
                 // 处理完成
                 jsBlock = "<script>EndTrans('处理完成。');</script>";
                 Response.Write(jsBlock);
                 Response.Flush();
             }
             else
             {
                 jsBlock = "<script>EndTrans('共有"+maxrows.ToString()+"条数据需要加载,其中 有"+errcount.ToString()+"条数据录入错误!');</script>";
                 Response.Write(jsBlock);
                 Response.Flush();
             }
             System.Threading.Thread.Sleep(1000);

             endTime = DateTime.Now;//录入完成所用时间
             TimeSpan ts1 = new TimeSpan(startTime.Ticks);
             TimeSpan ts2 = new TimeSpan(endTime.Ticks);
             TimeSpan ts = ts2.Subtract(ts1).Duration(); //取开始时间和结束时间两个时间差的绝对值
             String spanTime = ts.Hours.ToString() + "小时" + ts.Minutes.ToString() + "分" + ts.Seconds.ToString() + "秒";
             jsBlock = "<script>SetTimeInfo('加载完成,共用时" + spanTime + "');</script>";
             Response.Write(jsBlock);
             Response.Flush();

        }
        public DataTable ExcelImport(string fileName) //建立Excel表链接,返回Excel表数据
        {
                //EXCEL 的连接串
                string sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
                "Data Source=C:\\Documents and Settings\\Administrator\\桌面\\" + fileName + ";" +
                "Extended Properties='Excel 8.0;IMEX=1';";
                //string sConnectionString = "Microsoft.ACE.OLEDB.4.0;" +
                //"Data Source=C:\\Documents and Settings\\Administrator\\桌面\\" + fileName + ";" +
                //"Extended Properties='Excel 8.0;IMEX=1';";
                OleDbConnection objConn = new OleDbConnection(sConnectionString);//建立EXCEL的连接

//说明:程序运行到这里的时候有时会出错“未在本地计算机上注册“Microsoft.ACE.OLEDB.12.0”提供程序”,此时大多数情况下我们只需要去http://download.microsoft.com/download/7/0/3/703ffbcb-dc0c-4e19-b0da-1463960fdcdb/AccessDatabaseEngine.exe下载一个AccessDatabaseEngine.exe安装即可,原因在于你的office没有安装ACCESS组件
                objConn.Open();
                OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [Sheet1$]", objConn);
                OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
                objAdapter1.SelectCommand = objCmdSelect;
                DataSet objDataset1 = new DataSet();
                objAdapter1.Fill(objDataset1, "XLData");
                DataTable dt = objDataset1.Tables[0];
                //DataView myView = new DataView(dt);
                objConn.Close();//关闭EXCEL的连接
                return dt;
}

三、项目执行过程中的效果图展示如下:


 

 

 

 

 

 


这个是程序测试中使用的excel表格实例。

希望本文所述对大家的.net程序设计有所帮助。



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