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Building LLM-Powered Applications with Claude

Build LLM-powered apps with the Anthropic Claude API or SDK across Python, TypeScript, Java, Go, Ruby, C#, and PHP.

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csharp/claude-api/files-api.md

1# Files API — C#
2 
3## Files API (Beta)
4 
5Files live under `client.Beta.Files` (namespace `Anthropic.Models.Beta.Files`). `BinaryContent` implicit-converts from `Stream` and `byte[]`.
6 
7```csharp
8using Anthropic.Models.Beta.Files;
9using Anthropic.Models.Beta.Messages;
10 
11FileMetadata meta = await client.Beta.Files.Upload(
12    new FileUploadParams { File = File.OpenRead("doc.pdf") });
13 
14// Referencing the uploaded file requires Beta message types:
15new BetaRequestDocumentBlock {
16    Source = new BetaFileDocumentSource { FileID = meta.ID },
17}
18```
19 
20The non-beta `DocumentBlockParamSource` union has no file-ID variant — file references need `client.Beta.Messages.Create()`.
21 
22---
23 
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Building LLM-Powered Applications with Claude

csharp/claude-api/files-api.md