From 6489349833d4d929dfb05702773cdd87156ece65 Mon Sep 17 00:00:00 2001
From: chavic <dev.chavic@gmail.com>
Date: Fri, 15 May 2026 17:39:36 +0200
Subject: [PATCH] Add C# SDK to nix dev shell

Provide .NET 10 SDK tooling in the default nix development shell while keeping the .NET 8 runtime available for the current net8.0 C# tests.

Opt out of dotnet CLI telemetry and document the nix command that generates bindings and runs the C# test suite.
---
 flake.nix                      | 8 ++++++++
 payjoin-ffi/csharp/README.md   | 7 +++++++
 payjoin-ffi/csharp/global.json | 2 +-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index 1b6e489b0..aa2f95097 100644
--- a/flake.nix
+++ b/flake.nix
@@ -270,6 +270,11 @@
             "payjoin-mailroom-image" = mkContainerImage "payjoin-mailroom" packages.payjoin-mailroom tag;
           };
 
+        dotnetSdk = pkgs.dotnetCorePackages.combinePackages [
+          pkgs.dotnetCorePackages.sdk_10_0
+          pkgs.dotnetCorePackages.runtime_8_0
+        ];
+
         devShells = builtins.mapAttrs (
           _name: craneLib:
           craneLib.devShell {
@@ -281,6 +286,7 @@
                 cargo-watch
                 rust-analyzer
                 dart
+                dotnetSdk
                 cargo-fuzz
                 bzip2 # needed for some machines to have access to libzip at runtime
                 codespell
@@ -290,6 +296,8 @@
               ];
             BITCOIND_EXE = pkgs.lib.getExe' pkgs.bitcoind "bitcoind";
             BITCOIND_SKIP_DOWNLOAD = 1;
+            DOTNET_ROOT = "${dotnetSdk}/share/dotnet";
+            DOTNET_CLI_TELEMETRY_OPTOUT = "1";
           }
         ) craneLibVersions;
 
diff --git a/payjoin-ffi/csharp/README.md b/payjoin-ffi/csharp/README.md
index 9afccc5c3..c6270d00c 100644
--- a/payjoin-ffi/csharp/README.md
+++ b/payjoin-ffi/csharp/README.md
@@ -6,6 +6,13 @@ Welcome to the C# language bindings for the [Payjoin Dev Kit](https://payjoindev
 
 Follow these steps to clone the repository and run the tests.
 
+With nix, the default development shell provides the Rust toolchain, .NET 10 SDK,
+and .NET 8 runtime:
+
+```shell
+nix develop -c bash payjoin-ffi/csharp/contrib/test.sh
+```
+
 ```shell
 git clone https://github.com/payjoin/rust-payjoin.git
 cd rust-payjoin/payjoin-ffi/csharp
diff --git a/payjoin-ffi/csharp/global.json b/payjoin-ffi/csharp/global.json
index 391ba3c2a..512142d2b 100644
--- a/payjoin-ffi/csharp/global.json
+++ b/payjoin-ffi/csharp/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "10.0.100",
     "rollForward": "latestFeature"
   }
 }