openui-forge-csharp

Name: openui-forge-csharp
Author: OthmanAdi

1installs0forks

How to install openui-forge-csharp?

othmanadi/openui-forge/openui-forge-csharp

$npx -y skills add OthmanAdi/openui-forge --skill openui-forge-csharp

Installs into the current project.

Summary

OpenUI generative UI with C# ASP.NET Core Minimal API backend. Direct OpenAI API SSE streaming via HttpClient on .NET 10.

Files · 1

View on GitHub

SKILL.md

1	# OpenUI Forge — C#
2
3	Build generative UI apps with a React frontend + C# backend. Streams OpenAI API responses directly via an ASP.NET Core Minimal API (.NET 10 LTS) using `HttpClient`.
4
5	## Activation Triggers
6
7	- "openui csharp", "openui c#", "openui dotnet", "openui aspnet"
8	- "generative ui csharp", "c# streaming ui backend", "asp.net core openui"
9
10	## Prerequisites
11
12	- Node.js >= 22 (24 LTS recommended) + React >= 18.3.1 (19+ recommended) (frontend)
13	- .NET SDK 10.0 (backend; .NET 10 is the current LTS, supported until Nov 2028. .NET 8 LTS also works but reaches end of support Nov 2026.)
14	- `OPENAI_API_KEY` environment variable set
15
16	## Quick Start
17
18	1. Create the React frontend and install OpenUI deps:
19	```bash
20	npm install @openuidev/react-ui @openuidev/react-headless @openuidev/react-lang lucide-react zod
21	```
22	2. Generate the system prompt:
23	```bash
24	npx @openuidev/cli generate ./src/lib/library.ts --out backend/system-prompt.txt
25	```
26	3. Create the C# backend (see Full Code below)
27	4. Run: `dotnet run` on `:5000`, frontend on `:3000`
28
29	## Full Code
30
31	### Backend: `backend/openui-backend.csproj`
32
33	```xml
34	<Project Sdk="Microsoft.NET.Sdk.Web">
35	<PropertyGroup>
36	<TargetFramework>net10.0</TargetFramework>
37	<Nullable>enable</Nullable>
38	<ImplicitUsings>enable</ImplicitUsings>
39	</PropertyGroup>
40	</Project>
41	```
42
43	> No NuGet packages required. ASP.NET Core, `HttpClient`/`IHttpClientFactory`, and `System.Text.Json` all ship in the .NET 10 shared framework referenced by `Microsoft.NET.Sdk.Web`.
44
45	### Backend: `backend/Program.cs`
46
47	```csharp
48	using System.Text;
49	using System.Text.Json;
50	using System.Text.Json.Serialization;
51
52	var builder = WebApplication.CreateBuilder(args);
53
54	// Pooled, correctly-disposed HttpClient instances. Infinite timeout because
55	// this is a long-lived streaming proxy; client disconnects cancel the request.
56	builder.Services.AddHttpClient("openai", client =>
57	{
58	client.Timeout = Timeout.InfiniteTimeSpan;
59	});
60
61	// CORS: lock to the configured frontend origin. Do NOT use AllowAnyOrigin —
62	// a wildcard would let any site call this backend and burn your API key.
63	var frontendOrigin =
64	Environment.GetEnvironmentVariable("FRONTEND_ORIGIN") ?? "http://localhost:3000";
65
66	builder.Services.AddCors(options =>
67	{
68	options.AddDefaultPolicy(policy =>
69	policy.WithOrigins(frontendOrigin)
70	.WithMethods("POST", "OPTIONS")
71	.AllowAnyHeader());
72	});
73
74	var app = builder.Build();
75
76	app.UseCors();
77
78	// Load the generated system prompt ONCE at startup; fail fast if missing.
79	var promptPath = Path.Combine(Directory.GetCurrentDirectory(), "system-prompt.txt");
80	if (!File.Exists(promptPath))
81	{
82	throw new FileNotFoundException(
83	"system-prompt.txt not found. Generate it with: " +
84	"npx @openuidev/cli generate ./src/lib/library.ts --out system-prompt.txt",
85	promptPath);
86	}
87	var systemPrompt = await File.ReadAllTextAsync(promptPath);
88
89	var apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY");
90	var baseUrl = (Environment.GetEnvironmentVariable("OPENAI_BASE_URL") ?? "https://api.openai.com/v1")
91	.TrimEnd('/');
92	var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-5.5";
93
94	app.MapPost("/api/chat", async (ChatRequest req, IHttpClientFactory httpClientFactory, HttpContext ctx) =>
95	{
96	if (string.IsNullOrEmpty(apiKey))
97	return Results.Json(new { error = "OPENAI_API_KEY not set" }, statusCode: 500);
98	if (req.Messages is null \|\| req.Messages.Length == 0)
99	return Results.Json(new { error = "messages must be a non-empty array" }, statusCode: 400);
100
101	// Prepend the server-side system prompt; never trust the client to supply it.
102	var messages = new List<ChatMessage> { new("system", systemPrompt) };
103	messages.AddRange(req.Messages);
104
105	var payload = JsonSerializer.Serialize(new OpenAiRequest(model, true, messages));
106
107	using var upstreamRequest = new HttpRequestMessage(
108	HttpMethod.Post, $"{baseUrl}/chat/completions")
109	{
110	Content = new StringContent(payload, Encoding.UTF8, "application/json"),
111	};
112	upstreamRequest.Headers.Add("Authorization", $"Bearer {apiKey}");
113
114	var client = httpClientFactory.CreateClient("openai");
115
116	// ResponseHeadersRead returns as soon as headers arrive, so we read the
117	// body incrementally off the socket instead of buffering it into memory.
118	var upstream = await client.SendAsync(
119	upstreamRequest, HttpCompletionOption.ResponseHeadersRead, ctx.RequestAborted);
120
121	if (!upstream.IsSuccessStatusCode)
122	{
123	var errorBody = await upstream.Content.ReadAsStringAsync(ctx.RequestAborted);
124	upstream.Dispose();
125	return Results.Json(
126	new { error = $"OpenAI returned {(int)upstream.StatusCode}: {errorBody}" },
127	statusCode: (int)upstream.Status

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openui-forge-csharp

1installs0forks

View on GitHub

How to install openui-forge-csharp?

othmanadi/openui-forge/openui-forge-csharp

$npx -y skills add OthmanAdi/openui-forge --skill openui-forge-csharp

Installs into the current project.

Summary

OpenUI generative UI with C# ASP.NET Core Minimal API backend. Direct OpenAI API SSE streaming via HttpClient on .NET 10.

Files · 1

View on GitHub

SKILL.md

1	# OpenUI Forge — C#
2
3	Build generative UI apps with a React frontend + C# backend. Streams OpenAI API responses directly via an ASP.NET Core Minimal API (.NET 10 LTS) using `HttpClient`.
4
5	## Activation Triggers
6
7	- "openui csharp", "openui c#", "openui dotnet", "openui aspnet"
8	- "generative ui csharp", "c# streaming ui backend", "asp.net core openui"
9
10	## Prerequisites
11
12	- Node.js >= 22 (24 LTS recommended) + React >= 18.3.1 (19+ recommended) (frontend)
13	- .NET SDK 10.0 (backend; .NET 10 is the current LTS, supported until Nov 2028. .NET 8 LTS also works but reaches end of support Nov 2026.)
14	- `OPENAI_API_KEY` environment variable set
15
16	## Quick Start
17
18	1. Create the React frontend and install OpenUI deps:
19	```bash
20	npm install @openuidev/react-ui @openuidev/react-headless @openuidev/react-lang lucide-react zod
21	```
22	2. Generate the system prompt:
23	```bash
24	npx @openuidev/cli generate ./src/lib/library.ts --out backend/system-prompt.txt
25	```
26	3. Create the C# backend (see Full Code below)
27	4. Run: `dotnet run` on `:5000`, frontend on `:3000`
28
29	## Full Code
30
31	### Backend: `backend/openui-backend.csproj`
32
33	```xml
34	<Project Sdk="Microsoft.NET.Sdk.Web">
35	<PropertyGroup>
36	<TargetFramework>net10.0</TargetFramework>
37	<Nullable>enable</Nullable>
38	<ImplicitUsings>enable</ImplicitUsings>
39	</PropertyGroup>
40	</Project>
41	```
42
43	> No NuGet packages required. ASP.NET Core, `HttpClient`/`IHttpClientFactory`, and `System.Text.Json` all ship in the .NET 10 shared framework referenced by `Microsoft.NET.Sdk.Web`.
44
45	### Backend: `backend/Program.cs`
46
47	```csharp
48	using System.Text;
49	using System.Text.Json;
50	using System.Text.Json.Serialization;
51
52	var builder = WebApplication.CreateBuilder(args);
53
54	// Pooled, correctly-disposed HttpClient instances. Infinite timeout because
55	// this is a long-lived streaming proxy; client disconnects cancel the request.
56	builder.Services.AddHttpClient("openai", client =>
57	{
58	client.Timeout = Timeout.InfiniteTimeSpan;
59	});
60
61	// CORS: lock to the configured frontend origin. Do NOT use AllowAnyOrigin —
62	// a wildcard would let any site call this backend and burn your API key.
63	var frontendOrigin =
64	Environment.GetEnvironmentVariable("FRONTEND_ORIGIN") ?? "http://localhost:3000";
65
66	builder.Services.AddCors(options =>
67	{
68	options.AddDefaultPolicy(policy =>
69	policy.WithOrigins(frontendOrigin)
70	.WithMethods("POST", "OPTIONS")
71	.AllowAnyHeader());
72	});
73
74	var app = builder.Build();
75
76	app.UseCors();
77
78	// Load the generated system prompt ONCE at startup; fail fast if missing.
79	var promptPath = Path.Combine(Directory.GetCurrentDirectory(), "system-prompt.txt");
80	if (!File.Exists(promptPath))
81	{
82	throw new FileNotFoundException(
83	"system-prompt.txt not found. Generate it with: " +
84	"npx @openuidev/cli generate ./src/lib/library.ts --out system-prompt.txt",
85	promptPath);
86	}
87	var systemPrompt = await File.ReadAllTextAsync(promptPath);
88
89	var apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY");
90	var baseUrl = (Environment.GetEnvironmentVariable("OPENAI_BASE_URL") ?? "https://api.openai.com/v1")
91	.TrimEnd('/');
92	var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-5.5";
93
94	app.MapPost("/api/chat", async (ChatRequest req, IHttpClientFactory httpClientFactory, HttpContext ctx) =>
95	{
96	if (string.IsNullOrEmpty(apiKey))
97	return Results.Json(new { error = "OPENAI_API_KEY not set" }, statusCode: 500);
98	if (req.Messages is null \|\| req.Messages.Length == 0)
99	return Results.Json(new { error = "messages must be a non-empty array" }, statusCode: 400);
100
101	// Prepend the server-side system prompt; never trust the client to supply it.
102	var messages = new List<ChatMessage> { new("system", systemPrompt) };
103	messages.AddRange(req.Messages);
104
105	var payload = JsonSerializer.Serialize(new OpenAiRequest(model, true, messages));
106
107	using var upstreamRequest = new HttpRequestMessage(
108	HttpMethod.Post, $"{baseUrl}/chat/completions")
109	{
110	Content = new StringContent(payload, Encoding.UTF8, "application/json"),
111	};
112	upstreamRequest.Headers.Add("Authorization", $"Bearer {apiKey}");
113
114	var client = httpClientFactory.CreateClient("openai");
115
116	// ResponseHeadersRead returns as soon as headers arrive, so we read the
117	// body incrementally off the socket instead of buffering it into memory.
118	var upstream = await client.SendAsync(
119	upstreamRequest, HttpCompletionOption.ResponseHeadersRead, ctx.RequestAborted);
120
121	if (!upstream.IsSuccessStatusCode)
122	{
123	var errorBody = await upstream.Content.ReadAsStringAsync(ctx.RequestAborted);
124	upstream.Dispose();
125	return Results.Json(
126	new { error = $"OpenAI returned {(int)upstream.StatusCode}: {errorBody}" },
127	statusCode: (int)upstream.Status

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