[英]EPPlus: Find if the entire row is empty in Excel
我在我的 .net 核心 web api 中使用 EPPlus 库。 在上述方法中,我想验证他上传的 excel。 我想知道我的整行是否为空。 我有以下代码:
using (ExcelPackage package = new ExcelPackage(file.OpenReadStream()))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
int rowCount = worksheet.Dimension.End.Row;
int colCount = worksheet.Dimension.End.Column;
//loop through rows and columns
for (int row = 1; row <= rowCount; row++)
{
for (int col = 1; col <= ColCount; col++)
{
var rowValue = worksheet.Cells[row, col].Value;
//Want to find here if the entire row is empty
}
}
}
上面的 rowValue 会告诉我特定单元格是否为空。 是否可以检查整行,如果为空则继续下一行。
您可以使用 linq 检查行单元格范围值:
var startRow = 1;
var endRow = 1;
var columnStart = 1;
var columnEnd = worksheet.Cells.End.Column;
var cellRange = worksheet.Cells[startRow, columnStart , endRow, columnEnd];
var isRowEmpty = cellRange.All(c => c.Value == null)
您可以在行级别的for
循环中设置一个布尔值。 然后循环所有单元格并在单元格不为空时更改布尔值。
//loop through rows and columns
for (int row = 1; row <= rowCount; row++)
{
//create a bool
bool RowIsEmpty = true;
for (int col = 1; col <= colCount; col++)
{
//check if the cell is empty or not
if (worksheet.Cells[row, col].Value != null)
{
RowIsEmpty = false;
}
}
//display result
if (RowIsEmpty)
{
Label1.Text += "Row " + row + " is empty.<br>";
}
}
如果您不知道要检查的列数,您可以利用Worksheet.Cells
集合仅包含实际具有值的单元格条目这一事实:
[TestMethod]
public void EmptyRowsTest()
{
//Throw in some data
var datatable = new DataTable("tblData");
datatable.Columns.AddRange(new[] { new DataColumn("Col1", typeof(int)), new DataColumn("Col2", typeof(int)), new DataColumn("Col3", typeof(object)) });
//Only fille every other row
for (var i = 0; i < 10; i++)
{
var row = datatable.NewRow();
if (i % 2 > 0)
{
row[0] = i;
row[1] = i * 10;
row[2] = Path.GetRandomFileName();
}
datatable.Rows.Add(row);
}
//Create a test file
var existingFile = new FileInfo(@"c:\temp\EmptyRowsTest.xlsx");
if (existingFile.Exists)
existingFile.Delete();
using (var pck = new ExcelPackage(existingFile))
{
var worksheet = pck.Workbook.Worksheets.Add("Sheet1");
worksheet.Cells.LoadFromDataTable(datatable, true);
pck.Save();
}
//Load from file
using (var pck = new ExcelPackage(existingFile))
{
var worksheet = pck.Workbook.Worksheets["Sheet1"];
//Cells only contains references to cells with actual data
var cells = worksheet.Cells;
var rowIndicies = cells
.Select(c => c.Start.Row)
.Distinct()
.ToList();
//Skip the header row which was added by LoadFromDataTable
for (var i = 1; i <= 10; i++)
Console.WriteLine($"Row {i} is empty: {rowIndicies.Contains(i)}");
}
}
在输出中给出这个(第 0 行是列标题):
Row 1 is empty: True
Row 2 is empty: False
Row 3 is empty: True
Row 4 is empty: False
Row 5 is empty: True
Row 6 is empty: False
Row 7 is empty: True
Row 8 is empty: False
Row 9 is empty: True
Row 10 is empty: False
您可以为此使用worksheet.Cells[row, col].count()
方法。 如果该行为空,则此方法将返回 0。
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