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SergeyMenshykh 7417eeb7e6 .NET: Use IA2AClientFactory to create A2AClient (#5277)
* Refactor A2A extensions to use IA2AClientFactory and add ProtocolSelection sample

- Update A2AAgentCardExtensions to accept IA2AClientFactory instead of A2AClientOptions
- Update A2ACardResolverExtensions to accept IA2AClientFactory
- Update A2AClientExtensions to accept IA2AClientFactory
- Update A2AAgent to use IA2AClientFactory for client creation
- Add A2AAgent_ProtocolSelection sample demonstrating protocol selection
- Add comprehensive unit tests for all changes
- Update README files with new sample reference

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Reorder params: options before loggerFactory in A2A extensions

Move A2AClientOptions parameter before ILoggerFactory in AsAIAgent
and GetAIAgentAsync extension methods to follow the repo convention
of keeping LoggerFactory and CancellationToken as the last parameters.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-04-15 17:29:36 +01:00

37 lines
1.4 KiB
C#

// Copyright (c) Microsoft. All rights reserved.
// This sample demonstrates how to select the A2A protocol binding (HTTP+JSON vs JSON-RPC) when
// creating an AIAgent from an A2A agent card using A2AClientOptions.PreferredBindings.
using A2A;
using Microsoft.Agents.AI;
var a2aAgentHost = Environment.GetEnvironmentVariable("A2A_AGENT_HOST") ?? throw new InvalidOperationException("A2A_AGENT_HOST is not set.");
// Initialize an A2ACardResolver to get an A2A agent card.
A2ACardResolver agentCardResolver = new(new Uri(a2aAgentHost));
// Get the agent card
AgentCard agentCard = await agentCardResolver.GetAgentCardAsync();
// Use A2AClientOptions to explicitly select the HTTP+JSON protocol binding.
// This tells the A2A client factory to prefer the HTTP+JSON interface when the agent card
// advertises multiple supported interfaces.
A2AClientOptions options = new()
{
PreferredBindings = [ProtocolBindingNames.HttpJson]
};
// To prefer JSON-RPC instead, use:
// A2AClientOptions options = new()
// {
// PreferredBindings = [ProtocolBindingNames.JsonRpc]
// };
// Create an instance of the AIAgent for an existing A2A agent, using the specified protocol binding.
AIAgent agent = agentCard.AsAIAgent(options: options);
// Invoke the agent and output the text result.
AgentResponse response = await agent.RunAsync("Tell me a joke about a pirate.");
Console.WriteLine(response);