用MVC导入导出

导入导出对于刚做的人一脸懵逼,但是明白思路之后就感觉非常容易,我也是研究了好久,才总算做了出来,放在这里给大家分享一下

一.先看下导出

视图脚本

<script type ="text/javascript" language="javascript">

        function selectExcel() {

            var GUID = document.getElementsByName("check");

        var temp = "";

        var strGUID = "";

        for (var i = 0; i < GUID.length; i++) {

        if (GUID[i].checked) {

        temp += GUID[i].value + ",";

        }

        }

        

        strGUID =  temp

        //alert(strGUID);//测试取到的值是否正确
        alert(strGUID);
        //$("#GUID").val(strGUID);//将多选的值赋给Id为strGUID的隐藏域
        document.getElementById("strGUID").value = strGUID;
        }

        </script>

 视图html代码

@using (Html.BeginForm("DataIn", "Home", FormMethod.Post))
    {
        <table>
            <tr>
                <td>@Html.Hidden("strGUID")</td>
                <td><input type="submit" value="导出" onclick="selectExcel()" /></td>
            </tr>
        </table>
    }

控制器代码

public ActionResult DataTableToExcel(string strGUID)
        {

            string[] GUID = Request.Form["strGUID"].Split(',');



            //这个是读取要导出的列表，逻辑要自己写的
            DataTable dt = new DataTable();
            dt.Columns.Add("序号");
            dt.Columns.Add("姓名");
            foreach (var aa in GUID)
            {
                if(aa!=null&& aa!="")
                {
                    int id=Convert.ToInt32(aa);
                    //List<User> list = db.user.Where(p => p.Uid == id).ToList();
                    User model = db.user.Find(id);
                    dt.Rows.Add(model.Uid,model.Uname);
                }
            }

             //= SQLServerDAL.DSalesOrders.SalesOrders_GetListExcel(strGUID).Tables[0];



            System.Web.UI.WebControls.DataGrid dgExport = null;

            // 当前对话 

            System.Web.HttpContext curContext = System.Web.HttpContext.Current;

            // IO用于导出并返回excel文件 

            System.IO.StringWriter strWriter = null;

            System.Web.UI.HtmlTextWriter htmlWriter = null;

            string filename = DateTime.Now.Year + "_" + DateTime.Now.Month + "_" + DateTime.Now.Day + "_"

            + DateTime.Now.Hour + "_" + DateTime.Now.Minute;

            byte[] str = null;



            if (dt != null)
            {

                // 设置编码和附件格式

                curContext.Response.Charset = "GB2312";

                Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");

                curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文

                curContext.Response.ContentType = "application/vnd.ms-excel";

                //System.Text.Encoding.UTF8;

                // 导出excel文件 

                strWriter = new System.IO.StringWriter();

                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);



                //// 为了解决dgData中可能进行了分页的情况，需要重新定义一个无分页的DataGrid 

                dgExport = new System.Web.UI.WebControls.DataGrid();

                dgExport.DataSource = dt.DefaultView;

                dgExport.AllowPaging = false;

                dgExport.DataBind();

                dgExport.RenderControl(htmlWriter);

                // 返回客户端 

                str = System.Text.Encoding.UTF8.GetBytes(strWriter.ToString());

            }

            return File(str, "attachment;filename=" + filename + ".xls");

        }

<!--如果报格式乱码错误  把设置编码和附件格式下的代码换成下面代码-->

curContext.Response.Charset = "GB2312";

                Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");

                curContext.Response.ContentEncoding = Encoding.Default;//设置输出流为简体中文

                curContext.Response.ContentType = "application/vnd.ms-excel";

                Response.Write("<meta http-equiv="content-type" content="application/vnd.ms-excel; charset=utf-8"/>");//加上这句话string类型就不乱码了

二,从Excel导入数据库

视图代码

 @using (Html.BeginForm("Show", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
       {
        
                <p>
                    选择文件：<input id="FileUpload" type="file" name="files" style=" 250px; height: 24px;
                    background: White" class="easyui-validatebox" />
                </p>
                <p>
                    <input id="btnImport" type="submit" value="导入" style=" 60px; height: 28px;" />
                </p>
       }

控制器代码

public ActionResult Show(HttpPostedFileBase filebase)
{
HttpPostedFileBase file=Request.Files["files"];
string FileName;
string savePath;
if (file == null||file.ContentLength<=0)
{
ViewBag.error = "文件不能为空";
return View();
}
else
{
string filename= Path.GetFileName(file.FileName);
int filesize = file.ContentLength;//获取上传文件的大小单位为字节byte
string fileEx = System.IO.Path.GetExtension(filename);//获取上传文件的扩展名
string NoFileName = System.IO.Path.GetFileNameWithoutExtension(filename);//获取无扩展名的文件名
int Maxsize = 4000 * 1024;//定义上传文件的最大空间大小为4M
string FileType = ".xls,.xlsx";//定义上传文件的类型字符串

FileName = NoFileName + DateTime.Now.ToString("yyyyMMddhhmmss") + fileEx;
if (!FileType.Contains(fileEx))
{
ViewBag.error = "文件类型不对，只能导入xls和xlsx格式的文件";
return View();
}
if (filesize >= Maxsize)
{
ViewBag.error = "上传文件超过4M，不能上传";
return View();
}
string path = AppDomain.CurrentDomain.BaseDirectory + "Excel/";
savePath = Path.Combine(path, FileName);
file.SaveAs(savePath);
}

//string result = string.Empty;
string strConn;
strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + savePath + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'";
OleDbConnection conn = new OleDbConnection(strConn);
conn.Open();
OleDbDataAdapter myCommand = new OleDbDataAdapter("select * from [Sheet1$]", strConn);
DataSet myDataSet = new DataSet();
try
{
myCommand.Fill(myDataSet, "ExcelInfo");
}
catch (Exception ex)
{
ViewBag.error = ex.Message;
return View();
}
DataTable table = myDataSet.Tables["ExcelInfo"].DefaultView.ToTable();

//引用事务机制，出错时，事物回滚
using (TransactionScope transaction = new TransactionScope())
{
for (int i = 0; i < table.Rows.Count; i++)
{
////获取地区名称
//string _areaName = table.Rows[i][0].ToString();
////判断地区是否存在
//if (!_areaRepository.CheckAreaExist(_areaName))
//{
// ViewBag.error = "导入的文件中：" + _areaName + "地区不存在，请先添加该地区";
// return View();
//}
//else
//{
// Station station = new Station();
// station.AreaID = _areaRepository.GetIdByAreaName(_areaName).AreaID;
// station.StationName = table.Rows[i][1].ToString();
// station.TerminaAddress = table.Rows[i][2].ToString();
// station.CapacityGrade = table.Rows[i][3].ToString();
// station.OilEngineCapacity = decimal.Parse(table.Rows[i][4].ToString());
// _stationRepository.AddStation(station);
//}
User model = new User();
model.Uname = table.Rows[i][0].ToString();
db.user.Add(model);
db.SaveChanges();
}
transaction.Complete();
}
ViewBag.error = "导入成功";
System.Threading.Thread.Sleep(2000);
return Content("<script>alert('数据导入成功！');location.href='/Home/Index'</script>");
}

三:注意,

导出中的事务机制需要引用 using System.Transactions;

若是没有添加这个.dll组件可以去程序集中添加引用