如何将日期与行匹配,然后使用EPPlus获得最终列值
本文关键字:EPPlus 然后 日期 | 更新日期: 2023-09-27 18:01:05
到目前为止,我可以从电子表格中简单地获取数据,只需获取参考号行,但我目前不知道如何在获取正确数据之前将行与数据部分匹配。
我目前必须从excel电子表格中提取一些数据,示例如下:
Start date Ref number
29/07/2015 2342326
01/07/2016 5697455
02/08/2016 3453787
02/08/2016 5345355
02/08/2015 8364456
03/08/2016 1479789
04/07/2015 9334578
主要问题是,是否可以从设置日期、行中读取数据,并从设置日期(如开始日期(中获得参考号。
例如,如果我只是想要从日期设置到上个月1日及以上的数据。
如何最好地实现这一点。
使用基本OleDb:获取列的当前代码示例
using System;
using System.Data.OleDb;
using System.Text.RegularExpressions;
namespace Number_Cleaner
{
public class NumberCleanerReport
{
public void runExcel_Report()
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("[*][START OF: NumberExt.xls, Number Extraction]");
Console.ResetColor();
string con =
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=NumberExt.xls;" +
@"Extended Properties='Excel 8.0;HDR=Yes;'";
string connectionString = ExcelWriter.GetConnectionString();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
using (OleDbConnection connection = new OleDbConnection(con))
{
connection.Open();
OleDbCommand command = new OleDbCommand("select * from [Sheet1$]", connection);
System.IO.StreamWriter files = new System.IO.StreamWriter(Controller.fpath + "NumberExtOutput.txt");
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
var row1Col0 = dr[0];
string ExcelData = row1Col0.ToString();
string subStr = "null";
try
{
subStr = ExcelData.Substring(0, 6);
}
catch
{
//Console.WriteLine("Found Nulls.");
}
if (subStr == "00")
{
string result = Regex.Replace(ExcelData, "^00", "0");
Console.WriteLine(result);
files.WriteLine(result);
cmd.CommandText = "INSERT INTO [table1]('MainNmbers') VALUES(" + result + ");";
cmd.ExecuteNonQuery();
}
}
files.Close();
conn.Close();
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("[*][END OF: NumberExt.xls, RefNumber Extraction]");
Console.ResetColor();
}
}
}
}
}
}
您可以将其加载到DataTable
中,然后用Linq-To-DataTable
进行过滤。下面是一个将所有内容都读取为字符串的方法。您可以修改它,使其使用DateTime.Parse
或DateTime.ParseExact
和int.Parse
:将第一列解析为DateTime
,将第二列解析为int
public static DataTable GetDataTableFromExcel(string path, bool hasHeader = true)
{
using (var pck = new OfficeOpenXml.ExcelPackage())
{
using (var stream = File.OpenRead(path))
{
pck.Load(stream);
}
var ws = pck.Workbook.Worksheets.First();
DataTable tbl = new DataTable();
foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
{
tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
}
var startRow = hasHeader ? 2 : 1;
for (int rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
{
var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
DataRow row = tbl.Rows.Add();
foreach (var cell in wsRow)
{
row[cell.Start.Column - 1] = cell.Text;
}
}
return tbl;
}
}
一旦表中有了正确的类型,查询就很简单了:
var rowsOfInterest = table.AsEnumerable()
.Where(row => row.Field<DateTime>("Start date") >= new DateTime(2016, 7, 1))
.ToList();
如果您需要它作为DataTable
:
DataTable resultTable = table.Clone(); // empty table with correct columns
if(rowsOfInterest.Count > 0)
resultTable = rowsOfInterest.CopyToDataTable();