# invoice-sdk-csharp
**Repository Path**: fapiaoapi/invoice-sdk-csharp
## Basic Information
- **Project Name**: invoice-sdk-csharp
- **Description**: 发票sdk 发票api C# csharp 电子发票 数电发票
- **Primary Language**: C#
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: https://fa-piao.com
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 0
- **Created**: 2026-03-29
- **Last Updated**: 2026-04-06
## Categories & Tags
**Categories**: Uncategorized
**Tags**: 发票, 发票sdk, 发票接口, 电子发票, 数电发票
## README
# 电子发票/数电发票 C# SDK | 开票、验真、红冲一站式集成
[](https://www.nuget.org/packages/Tax.Invoice)
[](https://github.com/fapiaoapi/invoice-sdk-csharp/blob/master/LICENSE)
[](https://dotnet.microsoft.com/zh-cn/download/dotnet/10.0)
**发票 C# SDK** 面向电子发票、数电发票（全电发票）场景，支持**开票、红冲、版式文件下载**等核心功能，快速对接税务平台API。
**关键词**: 电子发票SDK,数电票C#,开票接口,发票api,发票开具,发票红冲,全电发票集成
---
## 📖 核心功能
### 基础认证
- ✅ **获取授权** - 快速接入税务平台身份认证
- ✅ **人脸二维码登录** - 支持数电发票平台扫码登录
- ✅ **认证状态查询** - 实时获取纳税人身份状态
### 发票开具
- 🎫 **数电蓝票开具** - 支持增值税普通/专用电子发票
- 📄 **版式文件下载** - 自动获取销项发票PDF/OFD/XML文件
### 发票红冲
- 🔍 **红冲前蓝票查询** - 精确检索待红冲的电子发票
- 🛑 **红字信息表申请** - 生成红冲凭证
- 🔄 **负数发票开具** - 自动化红冲流程
---
## 🚀 快速安装
### NuGet
```bash
dotnet add package Tax.Invoice --version 1.0.7
```
[📦 查看NuGet最新版本](https://www.nuget.org/packages/Tax.Invoice)
本SDK基于 C# 12 与 .NET 10 开发
---
[📚 查看完整中文文档](https://fa-piao.com/doc.html?source=github) | [💡 更多示例代码](https://gitee.com/fapiaoapi/invoice-sdk-csharp/tree/master/Example)
---
其他版本请用旧版本
[C#8-C#11开发票demo](https://gitee.com/fapiaoapi/invoice-sdk-csharp/blob/master/Example/BasicExample.cs "C#8-C#11开发票demo")
[C#8-C#11红冲发票demo](https://gitee.com/fapiaoapi/invoice-sdk-csharp/blob/master/Example/RedInvoiceExample.cs "C#8-C#11红冲发票demo")
[C#8-C#11发票税额demo](https://gitee.com/fapiaoapi/invoice-sdk-csharp/blob/master/Example/TaxExample.cs "C#8-C#11发票税额demo")
---
## 🔍 为什么选择此SDK？
- **精准覆盖中国数电发票标准** - 严格遵循国家最新接口规范
- **开箱即用** - 无需处理XML/签名等底层细节，专注业务逻辑
- **企业级验证** - 已在生产环境处理超100万张电子发票
---
## 📊 支持的开票类型
| 发票类型 | 状态 |
|----------------|--------|
| 数电发票（普通发票） | ✅ 支持 |
| 数电发票（增值税专用发票） | ✅ 支持 |
| 数电发票（铁路电子客票） | ✅ 支持 |
| 数电发票（航空运输电子客票行程单） | ✅ 支持 |
| 数电票（二手车销售统一发票） | ✅ 支持 |
| 数电纸质发票（增值税专用发票） | ✅ 支持 |
| 数电纸质发票（普通发票） | ✅ 支持 |
| 数电纸质发票（机动车发票） | ✅ 支持 |
| 数电纸质发票（二手车发票） | ✅ 支持 |
---
## 🤝 贡献与支持
- 提交Issue: [问题反馈](https://github.com/fapiaoapi/invoice-sdk-csharp/issues)
- 商务合作: yuejianghe@qq.com
---
## 🎯 快速开始：
```csharp
using System;
using System.Collections.Generic;
using System.Text;
using Tax.Invoice;
using Tax.Invoice.Model;
using System.Text.Json;
using StackExchange.Redis;
using System.Threading.Tasks;
using System.Runtime.Versioning;
using ZXing;
using ZXing.QrCode;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;
public class BasicExample
{
public static String appKey = "";
public static String appSecret = "";
public static String nsrsbh = "";// 统一社会信用代码
public static String title = "";// 名称（营业执照）
public static String username = "";// 手机号码（电子税务局）
public static String password = "";// 个人用户密码（电子税务局）
public static String type = "6";// 6 基础 7标准
public static String xhdwdzdh = "重庆市渝北区龙溪街道丽园路2号XXXX 1325580XXXX"; // 地址和电话 空格隔开
public static String xhdwyhzh = "工商银行XXXX 15451211XXXX";// 开户行和银行账号 空格隔开
public static String token = "";
public static Boolean debug = true; // 是否打印日志
// 创建客户端
public static InvoiceClient client = new InvoiceClient(appKey, appSecret, debug);
// redis
public static ConnectionMultiplexer redis = LazyConnection.Connect("127.0.0.1:6379,password=test123456,abortConnect=false");
public static async Task Main(string[] args)
{
try
{
Console.OutputEncoding = Encoding.UTF8;
Console.WriteLine("dotnet " + Environment.Version);
// dotnet add package StackExchange.Redis
// 一 获取token 从Redis获取token
GetToken(false);
// 二 开具蓝票
/*
* 前端模拟数电发票/电子发票开具 (蓝字发票)
* @see https://fa-piao.com/fapiao.html?source=github
*/
var invoiceResponse = BlueTicket();
switch (invoiceResponse.Code)
{
case 200:
// 三 下载发票
DownloadPdfOfdXml(invoiceResponse.Data["fphm"].ToString(), invoiceResponse.Data["kprq"].ToString());
break;
case 420:
Console.WriteLine("登录(短信认证)");
/*
* 前端模拟短信认证弹窗
* @see https://fa-piao.com/fapiao.html?action=sms&source=github
*/
// 1. 发短信验证码
/*
* @see https://fa-piao.com/doc.html#api2?source=github
*/
var loginResponse = client.LoginDppt(nsrsbh, username, password, "");
if (loginResponse.Code == 200)
{
Console.WriteLine("请输入验证码");
var smsTimeout = TimeSpan.FromSeconds(300);
Console.WriteLine($"请在{smsTimeout.TotalSeconds}秒内输入验证码，过期时间为: {DateTime.UtcNow.Add(smsTimeout).ToString("yyyy-MM-dd HH:mm:ss")}前)输入验证码: ");
var inputSmsTask = Task.Run(Console.ReadLine);
var completedSmsTask = await Task.WhenAny(inputSmsTask, Task.Delay(smsTimeout));
if (completedSmsTask == inputSmsTask)
{
Console.WriteLine($"输入: {inputSmsTask.Result}");
// 2. 输入验证码
/*
* @see https://fa-piao.com/doc.html#api2?source=github
*/
var loginResponse2 = client.LoginDppt(nsrsbh, username, password, inputSmsTask.Result);
if (loginResponse2.Code == 200)
{
Console.WriteLine("短信验证成功");
Console.WriteLine("请再次调用BlueTicket");
invoiceResponse = BlueTicket();
if (invoiceResponse.Code == 200)
{
DownloadPdfOfdXml(invoiceResponse.Data["fphm"].ToString(), invoiceResponse.Data["kprq"].ToString());
}
else
{
Console.WriteLine(invoiceResponse.Code + "开具蓝票失败: " + invoiceResponse.Msg);
}
}
else
{
Console.WriteLine(loginResponse2.Code + "短信验证失败: " + loginResponse2.Msg);
}
}
else
{
Console.WriteLine("超时！未输入验证码！");
}
}
else
{
Console.WriteLine(loginResponse.Code + "发短信验证码失败: " + loginResponse.Msg);
}
break;
case 430:
Console.WriteLine("人脸认证");
/*
* 前端模拟人脸认证弹窗
* @see https://fa-piao.com/fapiao.html?action=face&source=github
*/
// 1. 获取人脸二维码
/*
* @see https://fa-piao.com/doc.html#api3?source=github
*/
var qrCodeResponse = client.GetFaceImg(nsrsbh, username, "1");
var qrData = qrCodeResponse.Data;
if (qrData == null)
{
Console.WriteLine(qrCodeResponse.Code + "人脸二维码返回为空: " + qrCodeResponse.Msg);
break;
}
var ewmly = qrData.GetValueOrDefault("ewmly")?.ToString() ?? "";
Console.WriteLine(ewmly == "swj" ? "请使用电子税务局app扫码" : "个人所得税app扫码");
Console.WriteLine("成功做完人脸认证,请输入数字 1");
var ewmObj = qrData.GetValueOrDefault("ewm");
if (ewmObj != null && ewmObj.ToString()?.Length < 500)
{
// 生成二维码图片base64字符串
// var base64 = StringToQrcodeBase64(ewmObj.ToString());
// qrData["ewm"] = base64;
// Console.WriteLine("生成二维码图片base64字符串");
//前端使用示例: 
}
StringToQrcode(ewmObj.ToString());
var faceTimeout = TimeSpan.FromSeconds(300);
Console.WriteLine($"请在{faceTimeout.TotalSeconds}秒内输入内容，过期时间为: {DateTime.UtcNow.Add(faceTimeout).ToString("yyyy-MM-dd HH:mm:ss")}");
var inputFaceTask = Task.Run(Console.ReadLine);
var completedFaceTask = await Task.WhenAny(inputFaceTask, Task.Delay(faceTimeout));
if (completedFaceTask == inputFaceTask)
{
Console.WriteLine($"输入: {inputFaceTask.Result}");
// 2. 认证完成后获取人脸二维码认证状态
/*
* @see https://fa-piao.com/doc.html#api4?source=github
*/
var rzid = qrData.GetValueOrDefault("rzid")?.ToString() ?? "";
var faceStatusResponse = client.GetFaceState(nsrsbh, rzid, username, "1");
if (faceStatusResponse.Data != null && faceStatusResponse.Data.GetValueOrDefault("slzt") != null)
{
var slzt = faceStatusResponse.Data.GetValueOrDefault("slzt")?.ToString() ?? "";
if (slzt == "2")
{
Console.WriteLine("人脸认证成功");
Console.WriteLine("请再次调用BlueTicket");
invoiceResponse = BlueTicket();
if (invoiceResponse.Code == 200)
{
DownloadPdfOfdXml(invoiceResponse.Data["fphm"].ToString(), invoiceResponse.Data["kprq"].ToString());
}
else
{
Console.WriteLine(invoiceResponse.Code + "开具蓝票失败: " + invoiceResponse.Msg);
}
break;
}
else
{
Console.WriteLine(slzt == "1" ? "人脸未认证" : "人脸认证二维码过期");
break;
}
}
else
{
Console.WriteLine("获取人脸二维码认证状态失败: " + faceStatusResponse.Msg);
break;
}
}
else
{
Console.WriteLine("人脸认证 超时！");
}
break;
case 401:
Console.WriteLine("授权失败:" + invoiceResponse.Msg);
Console.WriteLine("401 token过期 重新获取并缓存token");
GetToken(true);
Console.WriteLine("再调用BlueTicket");
invoiceResponse = BlueTicket();
if (invoiceResponse.Code == 200)
{
DownloadPdfOfdXml(invoiceResponse.Data["fphm"].ToString(), invoiceResponse.Data["kprq"].ToString());
}
else
{
Console.WriteLine(invoiceResponse.Code + "开具蓝票失败: " + invoiceResponse.Msg);
}
break;
default:
// Console.WriteLine("参数:" + invoiceParams);
Console.WriteLine(invoiceResponse.Code + "异常" + invoiceResponse.Msg);
break;
}
}
catch (Exception e)
{
Console.WriteLine("系统错误：" + e.Message);
Console.WriteLine(e);
}
}
// 字符串转二维码 在命令行输出
public static void StringToQrcode(String str)
{
var writer = new QRCodeWriter();
var hints = new Dictionary
{
[EncodeHintType.MARGIN] = 2,
[EncodeHintType.ERROR_CORRECTION] = "M"
};
var matrix = writer.encode(str, BarcodeFormat.QR_CODE, 0, 0, hints);
var width = matrix.Width + 4;
var height = matrix.Height + 4;
for (var y = 0; y < height; y += 2)
{
var line = new StringBuilder(width);
for (var x = 0; x < width; x++)
{
var top = IsDark(matrix, x - 2, y - 2);
var bottom = IsDark(matrix, x - 2, y - 1);
line.Append(top
? (bottom ? "█" : "▀")
: (bottom ? "▄" : " "));
}
Console.WriteLine(line.ToString());
}
}
public static bool IsDark(ZXing.Common.BitMatrix matrix, int x, int y)
{
if (x < 0 || y < 0 || x >= matrix.Width || y >= matrix.Height)
{
return false;
}
return matrix[x, y];
}
public static void DownloadPdfOfdXml(String fphm, String kprq)
{
/*
* 获取销项数电版式文件
* @see https://fa-piao.com/doc.html#api7?source=github
*
*/
var pdfParams = new Dictionary
{
["downflag"] = "4",
["nsrsbh"] = nsrsbh,
["username"] = username,
["fphm"] = fphm,
["Kprq"] = kprq
};
var pdfResponse = client.GetPdfOfdXml(pdfParams);
if (pdfResponse.IsSuccess)
{
Console.WriteLine("发票下载成功");
Console.WriteLine(JsonSerializer.Serialize(pdfResponse.Data, new JsonSerializerOptions
{
WriteIndented = true
}));
}
}
public static ApiResponse> BlueTicket()
{
/*
*
* 开票税额计算demo
* @see https://gitee.com/fapiaoapi/invoice-sdk-java/blob/master/examples/TaxExample.java
*/
// 开具蓝票参数
var invoiceParams = new Dictionary
{
["fplxdm"] = "82",
["fpqqlsh"] = appKey + DateTimeOffset.Now.ToUnixTimeMilliseconds(),
["ghdwmc"] = "个人",
["hjje"] = 396.04,
["hjse"] = 3.96,
["jshj"] = 400,
["kplx"] = 0,
["username"] = username,
["xhdwdzdh"] = xhdwdzdh,
["xhdwmc"] = title,
["xhdwsbh"] = nsrsbh,
["xhdwyhzh"] = xhdwyhzh,
["zsfs"] = 0,
["fyxm[0][fphxz]"] = 0,
["fyxm[0][spmc]"] = "*软件维护服务*接口服务费",
["fyxm[0][ggxh]"] = "",
["fyxm[0][dw]"] = "次",
["fyxm[0][spsl]"] = 100,
["fyxm[0][dj]"] = 1,
["fyxm[0][je]"] = 100,
["fyxm[0][sl]"] = 0.01,
["fyxm[0][se]"] = 0.99,
["fyxm[0][hsbz]"] = 1,
["fyxm[0][spbm]"] = "3040201030000000000",
["fyxm[1][fphxz]"] = 0,
["fyxm[1][spmc]"] = "*软件维护服务*接口服务费",
["fyxm[1][ggxh]"] = "",
["fyxm[1][spsl]"] = 150,
["fyxm[1][dj]"] = 2,
["fyxm[1][je]"] = 300,
["fyxm[1][sl]"] = 0.01,
["fyxm[1][se]"] = 2.97,
["fyxm[1][hsbz]"] = 1,
["fyxm[1][spbm]"] = "3040201030000000000"
};
// 二 开具蓝票
/*
* 开具数电发票文档
* @see https://fa-piao.com/doc.html#api6?source=github
*
*/
return client.BlueTicket(invoiceParams);
}
// 获取token
public static void GetToken(Boolean forceUpdate)
{
var key = nsrsbh + "@" + username + "@TOKEN";
var redisService = redis.GetDatabase();
if (forceUpdate)
{
/*
* 获取授权
* @see https://fa-piao.com/doc.html#api1?source=github
*
*/
var authResponse = client.GetAuthorization(nsrsbh, type);
if (authResponse.IsSuccess)
{
token = authResponse.Data.Token;
client.SetAuthorization(token);
redisService.StringSet(key, token, TimeSpan.FromDays(30));
}
}
else
{
token = redisService.StringGet(key);
if (token != null)
{
client.SetAuthorization(token);
Console.WriteLine("从Redis获取token成功");
}
else
{
var authResponse = client.GetAuthorization(nsrsbh, type);
if (authResponse.IsSuccess)
{
token = authResponse.Data.Token;
client.SetAuthorization(token);
redisService.StringSet(key, token, TimeSpan.FromDays(30));
}
}
}
}
// 生成二维码图片base64
[SupportedOSPlatform("windows6.1")]
public static string StringToQrcodeBase64(string str)
{
var writer = new QRCodeWriter();
var hints = new Dictionary
{
[EncodeHintType.MARGIN] = 2,
[EncodeHintType.ERROR_CORRECTION] = "M"
};
var matrix = writer.encode(str, BarcodeFormat.QR_CODE, 300, 300, hints);
using var bitmap = new Bitmap(matrix.Width, matrix.Height);
for (var y = 0; y < matrix.Height; y++)
{
for (var x = 0; x < matrix.Width; x++)
{
bitmap.SetPixel(x, y, matrix[x, y] ? Color.Black : Color.White);
}
}
using var ms = new MemoryStream();
bitmap.Save(ms, ImageFormat.Png);
return Convert.ToBase64String(ms.ToArray());
}
}
public static class LazyConnection
{
private static Lazy _lazy;
private static string _connectionString;
public static ConnectionMultiplexer Connect(string connectionString)
{
if (_lazy == null || _connectionString != connectionString)
{
_connectionString = connectionString;
_lazy = new Lazy(() => ConnectionMultiplexer.Connect(connectionString));
}
return _lazy.Value;
}
}
```
[基础开票示例](Example/BasicExample.cs)
[红冲示例](Example/RedInvoiceExample.cs)
[税额计算示例](Example/TaxExample.cs)