如何取消保護Excel工作表（簡單指南）

=COUNTIF(B:B, B2)

This appears to be an Excel formula rather than C# code. If you have C# code that interacts with Excel or a specific C# snippet you'd like converted, please provide that code for conversion to VB.NET.

using IronXL;
using System.Linq;
// Load the workbook
WorkBook workbook = WorkBook.Load("financial_report.xlsx");
WorkSheet sheet = workbook.DefaultWorkSheet;
// Select the column to audit (e.g., Column B - Revenue)
var range = sheet["B2:B20"];
// Use LINQ to find the duplicate values
var duplicateList = range.GroupBy(c => c.Value.ToString())
                         .Where(g => g.Count() > 1)
                         .Select(g => g.Key);
// Apply styling to those duplicates
foreach (var cell in range)
{
    if (duplicateList.Contains(cell.Value.ToString()))
    {
        cell.Style.BackgroundColor = "#FFC7CE"; // Light Red fill
        cell.Style.Font.Color = "#9C0006";       // Dark Red text
    }
}
// Save the audited file
workbook.SaveAs("Audited_financial_report.xlsx");

Imports IronXL
Imports System.Linq

' Load the workbook
Dim workbook As WorkBook = WorkBook.Load("financial_report.xlsx")
Dim sheet As WorkSheet = workbook.DefaultWorkSheet

' Select the column to audit (e.g., Column B - Revenue)
Dim range = sheet("B2:B20")

' Use LINQ to find the duplicate values
Dim duplicateList = range.GroupBy(Function(c) c.Value.ToString()) _
                         .Where(Function(g) g.Count() > 1) _
                         .Select(Function(g) g.Key)

' Apply styling to those duplicates
For Each cell In range
    If duplicateList.Contains(cell.Value.ToString()) Then
        cell.Style.BackgroundColor = "#FFC7CE" ' Light Red fill
        cell.Style.Font.Color = "#9C0006"       ' Dark Red text
    End If
Next

' Save the audited file
workbook.SaveAs("Audited_financial_report.xlsx")