C# を使用して Excel ファイル内のデータを読み取り、特定の電子メール形式を検索する方法

<code class="language-csharp">string filePath = s.Text; // Replace 's.Text' with your file path.
try
{
    Excel.Workbook workbook = ExcelObj.Workbooks.Open(filePath, ReadOnly: true, UpdateLinks: false);
    // ... further processing ...
}
catch (Exception ex)
{
    // Handle exceptions, such as file not found or access denied.
    Console.WriteLine($"Error opening Excel file: {ex.Message}");
}</code>

<code class="language-csharp">using System.Text.RegularExpressions;

// ... (previous code) ...

foreach (Excel.Worksheet worksheet in workbook.Worksheets)
{
    foreach (Excel.Range cell in worksheet.UsedRange)
    {
        string cellValue = cell.Value2?.ToString();
        if (!string.IsNullOrEmpty(cellValue))
        {
            // Regular expression for email validation (adjust as needed)
            string emailRegex = @"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b";
            Match match = Regex.Match(cellValue, emailRegex);
            if (match.Success)
            {
                string emailAddress = match.Value;
                // Process the validated email address
                Console.WriteLine($"Found email: {emailAddress}");
            }
        }
    }
}

// ... (rest of the code) ...</code>

<code class="language-csharp">// ... (previous code) ...

workbook.Close(SaveChanges: false); // Close without saving changes.
ExcelObj.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(ExcelObj);
workbook = null;
ExcelObj = null;
GC.Collect(); // Force garbage collection.</code>