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docs: Add reading file from a container #1151

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docs: Add reading file from a container #1151

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12 changes: 12 additions & 0 deletions docs/api/create_docker_container.md
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Expand Up @@ -55,6 +55,18 @@ _ = new ContainerBuilder()
.WithResourceMapping(Encoding.Default.GetBytes("{}"), "/app/appsettings.json");
```

## Reading files from the container

The `IContainer` interface offers a `ReadFileAsync(string, CancellationToken)` method to read files from the container. The implementation returns the read bytes. Either process the read bytes in-memory or persist them to the disk.

```csharp title="Reading a file"
var readBytes = await container.ReadFileAsync("/app/appsettings.json")
.ConfigureAwait(false);

await File.WriteAllBytesAsync("appsettings.json", readBytes)
.ConfigureAwait(false);
```

## Examples

An NGINX container that binds the HTTP port to a random host port and hosts static content. The example connects to the web server and checks the HTTP status code.
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