c# – 并发读取和写入Excel文件

是否有可能只有一个进程执行WRITE而许多进程在excel文件上执行READ操作？我正在使用ExcelPackage(EPPlus).

为了演示,我编写了两个控制台应用程序,用于迭代编写,另一个用于阅读.同时运行它们会导致任何一方出现故障.

写

// simply write to a column
var fileLocation = "D:\\Book.xlsx";
FileInfo fi = new FileInfo(fileLocation);

int i = 1;
while (1 == 1)  //ALERT: an infinite loop!
{
    using (ExcelPackage excelPackage = new ExcelPackage(fi))
    {
        ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets["Sheet1"];
        var row = worksheet.Row(2);

        worksheet.Cells[$"A{i}"].Value = "Test " + i.ToString();
        excelPackage.Save();
        i++;
    }
}

读

//simply populate a list reading excel
var fileLocation = "D:\\Book.xlsx";
FileInfo fi = new FileInfo(fileLocation);
List<string> list = new List<string>();
ExcelWorksheet worksheet = null;
int i = 1;
while (1 == 1)  //ALERT: an infinite loop!
{
    using (ExcelPackage excelPackage = new ExcelPackage(fi))
    {
        worksheet = excelPackage.Workbook.Worksheets["Sheet1"];
        if (worksheet.Cells[i,1].Value != null)
        {
            list.Add(worksheet.Cells[i,1].Value.ToString());
        }
    }

    list.Clear();
}

解决方法

在阅读时,您无法同时读取和写入相同的文件.您可以将整个文件读入内存,然后您可以处理它,处理后您可以将其写回.