Senparc.Weixin is an Apache-2.0 licensed, open-source .NET SDK for building against the full range of WeChat platforms — official accounts, mini programs, mini games, WeChat Pay, WeCom (Enterprise WeChat), the open platform, and JSSDK — and it is aimed at C# and .NET developers who need to integrate those services into their own applications.

What it is

Senparc.Weixin is a C# library family that wraps the WeChat platform APIs so that .NET developers do not have to hand-roll HTTP calls, signature verification, and message serialization for every WeChat product. It targets .NET Framework, .NET Core, and .NET 10.0, and it is distributed as a set of NuGet packages rather than a single monolith. The package list covers the platform surface directly: Senparc.Weixin.MP and Senparc.Weixin.MP.Middleware for official accounts, Senparc.Weixin.WxOpen for mini programs, Senparc.Weixin.Work for WeCom, Senparc.Weixin.TenPay and Senparc.Weixin.TenPayV3 for payments, Senparc.Weixin.Open for the open platform, and Senparc.Weixin.All as an aggregate. ASP.NET-specific glue ships separately as Senparc.Weixin.AspNet and Senparc.Weixin.MP.Mvc.

The concrete problem it solves is the integration layer between a .NET application and WeChat's many separate service APIs. Instead of writing and maintaining bespoke access-token management, message handling, and payment callback code for each platform, a team installs the relevant packages and builds on top of them. Because WeChat deployments commonly run across more than one server, the SDK also includes a distributed cache abstraction: Senparc.Weixin.Cache.Redis, Senparc.Weixin.Cache.CsRedis, Senparc.Weixin.Cache.Memcached, and Senparc.Weixin.Cache.Dapr are published packages, so access tokens and session state can be shared rather than held per-process.

Key capabilities

• Covers official accounts, mini programs, mini games, WeChat Pay (including Senparc.Weixin.TenPayV3), Enterprise WeChat/企业号, the open platform, JSSDK, and WeChat peripheral services.
• Ships per-platform NuGet packages — Senparc.Weixin.MP, Senparc.Weixin.WxOpen, Senparc.Weixin.Work, Senparc.Weixin.TenPay, Senparc.Weixin.Open — plus Senparc.Weixin.All for combined installs.
• Provides ASP.NET and MVC integration through Senparc.Weixin.AspNet, Senparc.Weixin.MP.Mvc, Senparc.Weixin.MP.Middleware, and Senparc.Weixin.WxOpen.Middleware.
• Supports distributed caching via Redis, CSRedis, Memcached, and Dapr cache packages, matching the topic tags cache, distributed-cache, and memcached.
• Targets multiple .NET generations in one codebase: .NET Framework, .NET Core, .NET 8, and .NET 10.0.
• Includes JSSDK support for web pages embedded inside WeChat clients.
• Provides Senparc.WebSocket for WebSocket scenarios.

Who uses it and how

• .NET shops building official account backends, where middleware packages handle inbound message routing inside an ASP.NET pipeline.
• Teams shipping mini programs that need a C# server side rather than a JavaScript-only backend, using Senparc.Weixin.WxOpen.
• Enterprises integrating WeCom alongside an existing internal .NET stack, via Senparc.Weixin.Work.
• Multi-instance deployments that must share access tokens across nodes, using the Redis, CSRedis, Memcached, or Dapr cache packages instead of in-process storage.
• Payment integrations requiring the v3 API, served by the separate Senparc.Weixin.TenPayV3 package.

Getting started

Install the NuGet packages for the platforms in use — for example Senparc.Weixin.MP for official accounts or Senparc.Weixin.All for the full set — and consult the project site at https://weixin.senparc.com. An English-language README is available as readme.en.md.

How it compares

No comparable tools are named in the supplied facts, and no list of paid products it replaces is provided. On the evidence available, it stands alone in this registry.

When to use it — and when not to

Use it when the team already works in C# or .NET and needs WeChat platform coverage without writing the integration layer from scratch; the project has been maintained for over 13 years and carries 8,896 stars and 4,342 forks. Be aware that a distributed deployment implies operating a cache backend such as Redis, CSRedis, Memcached, or Dapr, which is extra infrastructure to run. The repository also carries 219 open issues, so anyone adopting it should expect to read source and track the backlog; teams outside the .NET ecosystem, or those needing only a single narrow WeChat API, may find the package surface heavier than their need.

builder.Services.AddSenparcWeixinServices(builder.Configuration);

var registerService = app.UseSenparcWeixin(app.Environment, null, null, register => { },
    (register, weixinSetting) =>
{
    //注册公众号信息（可以执行多次，注册多个公众号）
    register.RegisterMpAccount(weixinSetting, "【盛派网络小助手】公众号");
});

await CustomApi.SendTextAsync("AppId", "OpenId", "Hello World!");