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我有一个列表,它包含另外 9 个属性,因为它包含一个子列表。
例如
Public Class BaseClass
{
public string Item1 { get; set; }
public string Item2 { get; set; }
public List<ChildClass> Item3 { get; set; }
............
}
Public Class ChildClass
{
public string Item1 { get; set; }
public string Item2 { get; set; }
public string Item3 { get; set; }
}
我编程将集合转换为具有列分组的 Excel 文件。在我的实际原始列表中,我有 3000 多个项目,每个项目都有一个计数为 4 到 6 的子列表。要迭代集合,1500 个集合需要 20 多分钟。
示例 Excel 工作表快照:
请引用以下示例代码,它生成带有虚拟数据的 Excel
我正在使用 ClosedXML - 请从 NuGet 获取引用
using ClosedXML.Excel;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class Program
{
static void Main(string[] args)
{
Program obj = new Program();
obj.GenerateData();
}
public void GenerateData()
{
XLWorkbook xlWorkBook = new XLWorkbook();
IXLWorksheet xlWorkSheet = xlWorkBook.Worksheets.Add("SearchResults");
Stopwatch stopwatch = new Stopwatch();
List<TimeSpan> timeElapsedList = new List<TimeSpan>();
Console.WriteLine("Excel Generation Started...");
stopwatch.Start();
int counter = 0;
int length = 1500;
int rowCount = 1;
for (int i = 0; i < length; i++)
{
Stopwatch loopstopwatch = new Stopwatch();
loopstopwatch.Start();
counter++;
#region Loop Statements Start
int rowHeight = 5;
int minHt = rowCount;
int maxHt = rowCount + rowHeight - 1;
xlWorkSheet.Cell(rowCount, 1).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 1).Value = "Row " + i + " - Item 1";
xlWorkSheet.Cell(rowCount, 1).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("A" + minHt.ToString() + ":A" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 2).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 2).Value = "Row " + i + " - Item 2";
xlWorkSheet.Cell(rowCount, 2).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("B" + minHt.ToString() + ":B" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 3).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 3).Value = "Row " + i + " - Item 3";
xlWorkSheet.Cell(rowCount, 3).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("C" + minHt.ToString() + ":C" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 4).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 4).Value = "Row " + i + " - Item 4";
xlWorkSheet.Cell(rowCount, 4).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("D" + minHt.ToString() + ":D" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 5).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 5).Value = "Row " + i + " - Item 5";
xlWorkSheet.Cell(rowCount, 5).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("E" + minHt.ToString() + ":E" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 6).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 6).Value = "Row " + i + " - Item 6";
xlWorkSheet.Cell(rowCount, 6).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("F" + minHt.ToString() + ":F" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 7).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 7).Value = "Row " + i + " - Item 7";
xlWorkSheet.Cell(rowCount, 7).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("G" + minHt.ToString() + ":G" + maxHt).Column(1).Merge();
xlWorkSheet.Cell(rowCount, 8).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 8).Value = "Row " + i + " - Item 8";
xlWorkSheet.Cell(rowCount, 8).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("H" + minHt.ToString() + ":H" + maxHt).Column(1).Merge();
for (int j = 0; j < rowHeight; j++)
{
xlWorkSheet.Cell(rowCount, 9).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 9).Value = "Row " + i + " | SubRow" + j + " - Sub Item 1";
xlWorkSheet.Cell(rowCount, 10).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 10).Value = "Row " + i + " | SubRow" + j + " - Sub Item 2";
xlWorkSheet.Cell(rowCount, 11).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 11).Value = "Row " + i + " | SubRow" + j + " - Sub Item 3";
xlWorkSheet.Cell(rowCount, 12).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 12).Value = "Row " + i + " | SubRow" + j + " - Sub Item 4";
xlWorkSheet.Cell(rowCount, 13).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 13).Value = "Row " + i + " | SubRow" + j + " - Sub Item 5";
xlWorkSheet.Cell(rowCount, 14).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 14).Value = "Row " + i + " | SubRow" + j + " - Sub Item 6";
xlWorkSheet.Cell(rowCount, 15).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(rowCount, 15).Value = "Row " + i + " | SubRow" + j + " - Sub Item 7";
rowCount++;
}
xlWorkSheet.Cell(minHt, 16).WorksheetColumn().Width = 25;
xlWorkSheet.Cell(minHt, 16).Value = "Row " + i + " - Item 9";
xlWorkSheet.Cell(minHt, 16).Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
xlWorkSheet.Range("P" + minHt.ToString() + ":P" + maxHt).Column(1).Merge();
#endregion
loopstopwatch.Stop();
timeElapsedList.Add(loopstopwatch.Elapsed);
Console.WriteLine("Iteration No: {0} - Time Taken {1}", counter, loopstopwatch.Elapsed);
}
stopwatch.Stop();
Console.WriteLine("Excel Construction Completed !");
Console.WriteLine("Total Time Taken to Complete {0}", stopwatch.Elapsed);
Console.WriteLine("Minimum Time : {0}", timeElapsedList.Min());
Console.WriteLine("Maximum Time : {0}", timeElapsedList.Max());
}
}
请帮助我如何在时间管理方面通过列合并优化代码。
最佳答案
如果您确定要合并的范围不相交(看起来确实如此),则可以通过使用以下 Merge
重载获得更好的性能:
IXLRange Merge(bool checkIntersect)
并传递 false
(您当前使用的无参数 Merge
重载传递 true
)作为 checkIntersect
。看起来检查交集的 ClosedXML 实现具有 O(N^2) 时间复杂度。
很快,将所有 .Merge()
调用替换为 .Merge(false)
,执行时间将接近没有合并的调用。
关于c# - 使用 C# Closed XML 在 excel 中合并列的性能,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37873567/
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