claude-code-system-prompts/system-prompts/data-streaming-reference-c.md

Streaming — C#

Streaming

using Anthropic.Models.Messages;

var parameters = new MessageCreateParams
{
    Model = Model.ClaudeOpus4_8,
    MaxTokens = 64000,
    Messages = [new() { Role = Role.User, Content = "Write a haiku" }]
};

await foreach (RawMessageStreamEvent streamEvent in client.Messages.CreateStreaming(parameters))
{
    if (streamEvent.TryPickContentBlockDelta(out var delta) &&
        delta.Delta.TryPickText(out var text))
    {
        Console.Write(text.Text);
    }
}

RawMessageStreamEvent TryPick methods (naming drops the Message/Raw prefix): TryPickStart, TryPickDelta, TryPickStop, TryPickContentBlockStart, TryPickContentBlockDelta, TryPickContentBlockStop. There is no TryPickMessageStop — use TryPickStop.

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