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dotnet add package PdfPigdotnet add package ZXing.Net

using (PdfDocument document = PdfDocument.Open(fullname)){ Page firstPage = document.GetPages().FirstOrDefault(); if (firstPage != ) { var firstImage = firstPage.GetImages().FirstOrDefault(); if (firstImage != ) { var bitmap = ConvertPdfImageToBitmap(firstImage); var result = reader.Decode(bitmap); if (result != ) { string[] values = result.Text.Split(','); if (values.Length < 8) break; dgvPdfFiles.Rows.Add(file.FullName, file.Name, values[3], values[5], values[4]); } } }}

var images = firstPage.GetImages().Where(i => i.HeightInSamples == i.WidthInSamples && i.WidthInSamples > 100 && i.HeightInSamples > 100);var firstImage = images.FirstOrDefault();

/// 
/// 正则匹配年月日/// 开票日期[:：]\s*\d{4}年\d{2}月\d{2}日/// </summary>private static readonly Regex dateRegex = new Regex(@"\d{4}年\d{2}月\d{2}日", RegexOptions.Compiled);
/// 
/// 匹配发票号码/// </summary>private static readonly Regex noRegex = new Regex(@"发票号码[:：]\s*(\d+)", RegexOptions.Compiled);
/// 
/// 匹配类目/// 匹配到第一个，然后去除两边的*号/// </summary>private static readonly Regex typeRegex = new Regex(@"\*.*?\*", RegexOptions.Compiled);
/// 
/// 匹配金额/// </summary>private static readonly Regex amountRegex2 = new Regex(@"[yen￥]\s*([0-9]+[.][0-9]{2})", RegexOptions.Compiled );

// 处理类目var typeMatch = typeRegex.Match(text);if (typeMatch.Success){ var type = typeMatch.Value.Trim('*'); dgvPdfFiles.Rows[dgvPdfFiles.Rows.Count - 1].Cells["InvoiceType"].Value = type;}// 处理发票号码if(dgvPdfFiles.Rows[dgvPdfFiles.Rows.Count - 1].Cells["InvoiceNo"].Value.ToString() == "?"){ var noMatch = noRegex.Match(text); if (noMatch.Success) { var no = noMatch.Groups[1].Value; dgvPdfFiles.Rows[dgvPdfFiles.Rows.Count - 1].Cells["InvoiceNo"].Value = no; }}

/// 
/// 导出/// 
/// <param name="sender"></param>/// <param name="e"></param>private void btnExport_Click(object sender, EventArgs e){ // 将列表导出CSV文件
 using (SaveFileDialog sfd = new SaveFileDialog() { FileName = "发票数据.csv", Filter = "CSV文件|*.csv", Title = "保存CSV文件" }) { if (sfd.ShowDialog() == DialogResult.OK) { string outputFilePath = sfd.FileName;
 using (StreamWriter sw = new StreamWriter(outputFilePath, false, Encoding.UTF8)) { // 带 BOM 的 UTF-8 文件头 sw.WriteLine("\uFEFF文件名,发票号码,开票日期,开票类目,金额");
 foreach (DataGridViewRow row in dgvPdfFiles.Rows) { string fileName = row.Cells["FileName"].Value.ToString(); string invoiceNo = row.Cells["InvoiceNo"].Value.ToString(); string invoiceDate = row.Cells["InvoiceDate"].Value.ToString(); string invoiceType = row.Cells["InvoiceType"].Value.ToString(); string invoiceAmount = row.Cells["InvoiceAmount"].Value.ToString();
 sw.WriteLine($"{fileName},{invoiceNo},{invoiceDate},{invoiceType},{invoiceAmount}"); } }
 // 询问是否打开文件 if (MessageBox.Show("CSV文件导出完成，是否打开？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) { System.Diagnostics.Process.Start(outputFilePath); }
 txtStatus.Text = "CSV文件导出完成"; } }}

/// 
/// 导出发票类目及金额信息/// 
/// <param name="sender"></param>/// <param name="e"></param>private void btnExportType_Click(object sender, EventArgs e){ // 将列表导出CSV文件 using (SaveFileDialog sfd = new SaveFileDialog() { FileName = "发票类目金额.csv", Filter = "CSV文件|*.csv", Title = "保存CSV文件" }) { if (sfd.ShowDialog() == DialogResult.OK) { string outputFilePath = sfd.FileName; using (StreamWriter sw = new StreamWriter(outputFilePath, false, Encoding.UTF8)) { // 带 BOM 的 UTF-8 文件头 sw.WriteLine("\uFEFF开票类目,金额"); var query = dgvPdfFiles.Rows.Cast().GroupBy(r => r.Cells["InvoiceType"].Value.ToString()) .Select(g => new { InvoiceType = g.Key, Amount = g.Sum(r => Convert.ToDecimal(r.Cells["InvoiceAmount"].Value)) }); foreach (var item in query) { sw.WriteLine($"{item.InvoiceType},{item.Amount}"); } }
 // 询问是否打开文件 if (MessageBox.Show("CSV文件导出完成，是否打开？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) { System.Diagnostics.Process.Start(outputFilePath); }
 txtStatus.Text = "CSV文件导出完成"; } }
}

// 合并PDF文件private void MergePdfFiles(string[] pdfFiles, string outputFilePath){ PdfDocumentBuilder builder = new PdfDocumentBuilder();
 foreach (string pdfFile in pdfFiles) { using (PdfDocument inputDocument = PdfDocument.Open(pdfFile)) { for (var i = 0; i < inputDocument.NumberOfPages; i++) { builder.AddPage(inputDocument, i + 1); } } }
 //保存PDF文件 var documentBytes = builder.Build(); File.WriteAllBytes(outputFilePath, documentBytes);}

/// 
/// 打印指定文件/// </summary>/// <param name="tempPdfFile"></param>private async void PrintPdfFile(string tempPdfFile){ System.Diagnostics.Process.Start("explorer", tempPdfFile); await Task.Delay(1000); // 发送 Ctrl + P SendKeys.SendWait("^(p)");}