标签：name cti int reading type alt order line one
This artice will write the main step to export generic data via csv with complete code and step by step.
1.Down load EntityFramework
Install-package entityframework -v 6.2.0
2.Add EF data model with only one table for simplicity.Take the AdventureWorks2017.Sales.SalesOrderDetail for example.
3.Override the ToString() method of the newly added data model cs file.
public override string ToString()
{
string formatMsg = SalesOrderID + "," + SalesOrderDetailID + "," + CarrierTrackingNumber + "," +
OrderQty + "," + ProductID + "," + SpecialOfferID + "," + UnitPrice + "," + UnitPriceDiscount + "," +
LineTotal + "," + rowguid + "," + ModifiedDate + Environment.NewLine;
return formatMsg;
}
4.To be exact and precise,I will add StopWatch to log the cost in milliseconds.
The full code as below.
So far in my own pc, I can test as much as 3.8 million rows data and cost about 25 seconds as the screenshot illustrated.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Diagnostics;
namespace ConsoleApp322
{
class Program
{
static string cvsFileFullName = Directory.GetCurrentDirectory() + "\\" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".csv";
static string fullLogFileName = Directory.GetCurrentDirectory() + "\\" + DateTime.Now.ToString("yyyyMMdd") + "log.txt";
static Stopwatch stopWatch = new Stopwatch();
static int exportNumber = 0;
static void Main(string[] args)
{
ExportTToCVS();
}
static void ExportTToCVS()
{
using (AdventureWorks2017Entities db = new AdventureWorks2017Entities())
{
List<SalesOrderDetail> orderList = db.SalesOrderDetails.ToList();
orderList.AddRange(orderList);
orderList.AddRange(orderList);
orderList.AddRange(orderList);
orderList.AddRange(orderList);
orderList.AddRange(orderList);
orderList.AddRange(orderList);
ExportListTToCVS<SalesOrderDetail>(orderList);
}
}
static void ExportListTToCVS<T>(List<T> dataList)
{
if(dataList!=null && dataList.Any())
{
stopWatch.Start();
exportNumber = dataList.Count;
StringBuilder orderBuilder = new StringBuilder();
var firstRowData = dataList.FirstOrDefault();
var orderProps = firstRowData.GetType().GetProperties().ToList();
orderBuilder.AppendLine(string.Join(",", orderProps.Select(x=>x.Name).ToArray()));
foreach(var dl in dataList)
{
orderBuilder.Append(dl.ToString());
}
using (StreamWriter streamWriter = new StreamWriter(cvsFileFullName))
{
streamWriter.WriteLine(orderBuilder.ToString());
}
stopWatch.Stop();
Process proc = Process.GetCurrentProcess();
long exportMemory = proc.PrivateMemorySize64;
string exportMsg = $"File path:{cvsFileFullName},export number:{exportNumber}," +
$"cost: {stopWatch.ElapsedMilliseconds} milliseconds,memory:{exportMemory}";
File.AppendAllText(fullLogFileName, exportMsg + Environment.NewLine);
}
}
}
}
标签：name cti int reading type alt order line one
原文地址：https://www.cnblogs.com/Fred1987/p/10344396.html
