EPPlus應用筆記

C#窗體程序中經常會使用到對數據的輸入輸出，而Excel文件是比較通用的文本格式，針對功能需求：

• 快速方便讀寫Excel文件
• 對於未安裝Office的機器也能具備生成和讀寫Excel的能力

通常有NPOI、ClosedXML、EPPlus等類庫可供使用，本文對EPPlus的簡單使用做一總結。

EPPlus的GitHub網址：https://github.com/EPPlusSoftware/EPPlus
EPPlus版本：5.0.4

讀取Excel文件至二維數組：

FileInfo file = new FileInfo(@"數據.xlsx");

ExcelPackage excelPackage = new ExcelPackage(file);
//許可證，必須添加許可證，否則會報錯
ExcelPackage.LicenseContext = OfficeOpenXml.LicenseContext.NonCommercial;
//選擇讀取的數據表
ExcelWorksheet excelWorksheet = excelPackage.Workbook.Worksheets["Sheet1"];
//獲取表格數據的最大行數        
int rowNum = excelWorksheet.Dimension.End.Row;
//獲取表格數據的最大列數
int columnNum = excelWorksheet.Dimension.End.Column;
//定義存儲數據的二維數組
string[,] dataTable = new string[rowNum, columnNum];

//按行讀取，存入二維數組dataTable
for (int i = excelWorksheet.Dimension.Start.Row; i <= excelWorksheet.Dimension.End.Row; i++)
{
	for (int j = excelWorksheet.Dimension.Start.Column; j <= excelWorksheet.Dimension.End.Column; j++)
    {
    	dataTable[i - 1, j - 1] = excelWorksheet.Cells[i, j].Value.ToString();
    }
}

//將數組遍歷輸出
for (int i = 0; i < dataTable.GetLength(0); i++)
{
	for (int j = 0; j < dataTable.GetLength(1); j++)
    {
    	Console.Write(dataTable[i, j] + "\t");
    }
    Console.Write("\n");
}
Console.ReadKey();

將數組寫入Excel表

//待寫入的數組，及Excel表存儲位置
string[] str = { "1", "5", "10", "15", "20" };
string outputExcelPath = System.Environment.CurrentDirectory + "\\數據.xlsx";
FileInfo file = new FileInfo(outputExcelPath);
//許可證
ExcelPackage.LicenseContext = OfficeOpenXml.LicenseContext.NonCommercial;

//如果文件存在，則讀取並寫入新的列，若不存在則創建
if (file.Exists)
{
	ExcelPackage excelPackage = new ExcelPackage(file);
    //選擇讀取的數據表
    ExcelWorksheet excelWorksheet = excelPackage.Workbook.Worksheets["Sheet1"];
    //獲取表格中已有數據的列數
    int columnNum = excelWorksheet.Dimension.End.Column;
    //寫入數據
    excelWorksheet.Cells[1, columnNum + 1].Value = "新數據";
    for (int i = 0; i < str.Length; i++)
    {
    	excelWorksheet.Cells[i + 2, columnNum + 1].Value = str[i];
    }
    excelPackage.Save();
}
else
{
	file = new FileInfo(outputExcelPath);
    ExcelPackage excelPackage = new ExcelPackage(file);
    //創建新的數據表
    ExcelWorksheet excelWorksheet = excelPackage.Workbook.Worksheets.Add("Sheet1");
    //寫入數據
    excelWorksheet.Cells[1, 1].Value = "數據";
    for (int i = 0; i < str.Length; i++)
    {
    	excelWorksheet.Cells[i + 2, 1].Value = str[i];
    }
    excelPackage.Save();
}

運行結果：

End