[英]How to read blank cell column value of excel using OpenXML in C#
Here in my Execl Sheet there are some blank value column cell, so When I use This code then in get Error "Object reference not set to an instance of an object". 在我的Execl工作表中,有一些空白值列单元格,因此当我使用此代码时,出现错误“对象引用未设置为对象的实例”。
foreach (Row row in rows)
{
DataRow dataRow = dataTable.NewRow();
for (int i = 0; i < row.Descendants<Cell>().Count(); i++)
{
dataRow[i] = GetCellValue(spreadSheetDocument, row.Descendants<Cell>().ElementAt(i));
}
dataTable.Rows.Add(dataRow);
}
private static string GetCellValue(SpreadsheetDocument document, Cell cell)
{
SharedStringTablePart stringTablePart = document.WorkbookPart.SharedStringTablePart;
string value = cell.CellValue.InnerXml;
if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
{
return stringTablePart.SharedStringTable.ChildElements[Int32.Parse(value)].InnerText;
}
else
{
return value;
}
}
The "CellValue" don't necessarily exist. “ CellValue”不一定存在。 In your case it is "null", so you have your error. 在您的情况下,它为“ null”,因此会出现错误。 To read your blank cell : 读取空白单元格:
If you don't want format the result depending what the cell contain, try 如果您不想根据单元格包含的内容格式化结果,请尝试
private static string GetCellValue(Cell cell)
{
return cell.InnerText;
}
if you want to format your cell before returning the value of it 如果要在返回值之前格式化单元格
private static string GetCellValue(SpreadsheetDocument doc, Cell cell)
{
// if no dataType, return the value of the innerText of the cell
if (cell.DataType == null) return cell.InnerText;
// depending type of the cell
switch (cell.DataType.Value)
{
// string => search for CellValue
case CellValues.String:
return cell.CellValue != null ? cell.CellValue.Text : string.Empty;
// inlineString => search of InlineString
case CellValues.InlineString:
return cell.InlineString != null ? cell.InlineString.Text.Text : string.Empty;
// sharedString => search for the SharedString
case CellValues.SharedString:
// is sharedPart exist ?
if (doc.WorkbookPart.SharedStringTablePart == null) doc.WorkbookPart.SharedStringTablePart = new SharedStringTablePart();
// is the text exist ?
foreach (SharedStringItem item in doc.WorkbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>())
{
// the text exist, return it from SharedStringTable
if (item.InnerText == cell.InnerText) return cell.InnerText;
}
// no text in sharedStringTable, create it and return it
doc.WorkbookPart.SharedStringTablePart.SharedStringTable.Append(new SharedStringItem(new DocumentFormat.OpenXml.Spreadsheet.Text(cell.InnerText)));
doc.WorkbookPart.SharedStringTablePart.SharedStringTable.Save();
return cell.InnerText;
// default case : bool / number / date
// return the value of the cell in plain text
// you can parse types depending your needs
default:
return cell.InnerText;
}
}
Two usefull documentations: 两个有用的文档:
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