问题
I want to read a column in Excel worksheet using SpreadSheetGear (.NET) and get unique values in that column back.
Example: From the above Excel worksheet, I need to read column B and get back unique values "John" "Mike" and "Wayne"
In real life, there can be 1,000,000+ rows so efficiency is important. How is that achieved?
回答1:
I Understand that the post is quite old but could be helpful for others:
The comment entered by @Michael Moreno will be helpful and I endorse the idea. But the concern is: How one can judge the number of rows or columns to iterate the loop. For this I suggest the Property IWorksheet.UsedRange to get the range of data contained by sheet.
Curtsy by: @Chris in his thread
来源：https://stackoverflow.com/questions/19226936/spreadsheetgear-read-unique-values-from-excel-column