实现增值税发票识别 c# demo

很高兴能为您解答问题。根据您的需求，我为您提供了以下基于 C# 的增值税发票识别 Demo：

using System;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;

namespace InvoiceRecognitionDemo
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // 设置请求的 API 地址和 API Key
            string url = "https://api-cn.document-ai.baidubce.com/v1/ocr/vat_invoice";
            string apiKey = "Your API Key";

            // 读取图片文件
            byte[] imageBytes = File.ReadAllBytes("Your Image Path");

            // 构造 HTTP 请求
            using (var httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("APPCODE", apiKey);

                using (var content = new MultipartFormDataContent())
                {
                    using (var imageContent = new ByteArrayContent(imageBytes))
                    {
                        imageContent.Headers.ContentType = MediaTypeHeaderValue.Parse("image/jpeg");
                        content.Add(imageContent, "image");

                        // 发送 HTTP 请求
                        var response = await httpClient.PostAsync(url, content);

                        // 解析返回的 JSON 数据
                        var responseContent = await response.Content.ReadAsStringAsync();
                        var result = JObject.Parse(responseContent);

                        // 输出识别结果
                        Console.WriteLine("发票代码：" + result["code"].ToString());
                        Console.WriteLine("发票号码：" + result["no"].ToString());
                        Console.WriteLine("开票日期：" + result["date"].ToString());
                        Console.WriteLine("购方名称：" + result["buyer"]["name"].ToString());
                        Console.WriteLine("购方纳税人识别号：" + result["buyer"]["taxpayerId"].ToString());
                        Console.WriteLine("购方地址电话：" + result["buyer"]["address"].ToString() + " " + result["buyer"]["phone"].ToString());
                        Console.WriteLine("购方开户行及账号：" + result["buyer"]["bank"].ToString() + " " + result["buyer"]["account"].ToString());
                        Console.WriteLine("货物或应税劳务名称：" + result["items"][0]["name"].ToString());
                        Console.WriteLine("规格型号：" + result["items"][0]["spec"].ToString());
                        Console.WriteLine("单位：" + result["items"][0]["unit"].ToString());
                        Console.WriteLine("数量：" + result["items"][0]["quantity"].ToString());
                        Console.WriteLine("单价：" + result["items"][0]["price"].ToString());
                        Console.WriteLine("金额：" + result["items"][0]["amount"].ToString());
                        Console.WriteLine("税率：" + result["items"][0]["taxRate"].ToString());
                        Console.WriteLine("税额：" + result["items"][0]["taxAmount"].ToString());
                        Console.WriteLine("价税合计：" + result["totalAmount"].ToString());
                    }
                }
            }

            Console.ReadLine();
        }
    }
}

请替换代码中的 Your API Key 和 Your Image Path 为您自己的信息，然后运行程序即可进行增值税发票识别。希望能够对您有所帮助！