导入Excel至SQL Server

string root = context.Server.MapPath("~/UploadFiles/");
//找到目标文件对象
HttpPostedFile uploadFile = context.Request.Files["Fdata"];
//获取文件后缀
string ext = uploadFile.FileName.Substring(uploadFile.FileName.LastIndexOf("."));
string file = string.Format("{0}{1}{2}", root, DateTime.Now.ToString("yyMMddhhmmssffff"), ext);
uploadFile.SaveAs(file);
if (File.Exists(file))
{
ExcelDataHelper excelDataHelper = new ExcelDataHelper(file, uploadFile.FileName);
string[] sheets = excelDataHelper.GetExcelSheetNames(file, uploadFile.FileName);
DataTable dt = excelDataHelper.GetAllData(sheets[0]);  //获取excel数据
DataColumnCollection col = dt.Columns;
if (dt == null)
{
return "没有需要导入的数据";
}
else
{
#region 填充数据
DataTable riskindex = dt as DataTable;
//构建新的结果集
DataTable newdt = new DataTable();
newdt.Columns.Add("Columns1");
newdt.Columns.Add("Columns2");
for (int i = 0; i < dt.Columns.Count; i++)
{
newdt.Columns.Add(dt.Columns[i].ColumnName);
}
for (int i = 0; i < dt.Rows.Count; i++)
{
List<DataRow> rows = riskindex.AsEnumerable().ToList();
if (rows.Count > 0)
{
try
{
DataRow dr = newdt.NewRow();
dr["Columns1"] = rows[i]["Value1"].ToString();
dr["Columns2"] = rows[i]["Value2"].ToString();
newdt.Rows.Add(dr);
}
catch (Exception ex)
{
return "导入出现问题！ " + ex;
}
}
}
if (newdt.Rows.Count == 0)
{
return "没有需要导入的数据";
}
//导入到数据库
testbll bll = new testbll();
rObj = bll.ImportEconomyDatas(newdt);
if (!rObj.IsSuccess)
{
return "导入出现问题！" + rObj.SystemMessage;
}
else
{
try
{
//删除临时文件
System.IO.File.Delete(file);
}
catch
{
return "导入失败";
}
}
#endregion
}
}
else
{
return "导入的文件不存在";
}