DallENet

A DALL·E integration library for .NET

Note The current version of the library requires a DALL·E 3 resource. If you want to use DALL·E 2, plese refer to this version.

Installation

The library is available on NuGet. Just search for DallENet in the Package Manager GUI or run the following command in the .NET CLI:

dotnet add package DallENet

Configuration

Register DALL·E service at application startup:

builder.Services.AddDallE(options =>
{
    // Azure OpenAI Service.
    options.UseAzure(resourceName: "", apiKey: "", authenticationType: AzureAuthenticationType.ApiKey);

    options.DefaultSize = DallEImageSizes._1792x1024;              // Default: 1024x1024
    options.DefaultQuality = DallEImageQualities.HD;               // Default: Standard
    options.DefaultStyle = DallEImageStyles.Natural;               // Default: Vivid
    options.DefaultResponseFormat = DallEImageResponseFormats.Url; // Default: Url
});

Currently, DallENet supports Azure OpenAI Service only. Support for OpenAI will be added in a future version. The required configuration parameters are the following:

• ResourceName: the name of your Azure OpenAI Resource (required).
• ApiKey: Azure OpenAI provides two methods for authentication. You can use either API Keys or Azure Active Directory (required).
• ApiVersion: the version of the API to use (optional). Allowed values:
  • 2023-12-01-preview (default)
• AuthenticationType: it specifies if the key is an actual API Key or an Azure Active Directory token (optional, default: "ApiKey").

Default Image Size

DALL·E 3 is able to generate images at different resolutions:

• 1024x1024
• 1792x1024
• 1024x1792

Using the DefaultSize property, it is possible to specify the default image size, unless you pass an explicit value in the GenerateImageAsync or GetImageStreamAsync methods. The default resolution is 1024x1024.

Default Quality

DALL·E 3 is able to generate images in standard or HD quality, that is, with finer details and greater consistency across the image. Using the DefaultQuality property, it is possible to specify the default quality, unless you pass an explicit value in the GenerateImageAsync or GetImageStreamAsync methods. The default quality is Standard.

Default Style

DALL·E 3 is able to generate images usinga vivid of natural style:

• Vivid generates hyper-real and dramatic images.
• Natural produces more natural, less hyper-real looking images.

Using the DefaultStyle property, it is possible to specify the default style, unless you pass an explicit value in the GenerateImageAsync or GetImageStreamAsync methods. The default style is Vivid.

Default Response format

DALL·E 3 is able to return the URL of the generated image of its Base64 encoding. Using the DefaultResponseFormat property, it is possible to specify the default quality, unless you pass an explicit value in the GenerateImageAsync or GetImageStreamAsync methods. The default quality is Url.

Configuration using an external source

The configuration can be automatically read from IConfiguration, using for example a DallE section in the appsettings.json file:

"DallE": {
    "Provider": "Azure",                // Optional. Currently only Azure is supported
    "ApiKey": "",                       // Required
    "ResourceName": "",                 // Required 
    "ApiVersion": "2023-12-01-preview", // Optional, used only by Azure OpenAI Service. Allowed values: 2023-12-01-preview (default)
    "AuthenticationType": "ApiKey",     // Optional, Allowed values: ApiKey (default) or ActiveDirectory

    "DefaultModel": "dall-e-3",         // Required
    "DefaultSize": "1792x1024",         // Optional, Allowed values: 1024x1024 (default), 1792x1024 or 1024x1792
    "DefaultQuality": "standard",       // Optional, Allowed values: standard (default) or hd
    "DefaultResponseFormat": "url",     // Optional, Allowed values: url (default) or b64_json
    "DefaultStyle": "vivid",            // Optional, Allowed values: natural (default), or vivid
    "ThrowExceptionOnError": true
    //"User": "UserName"                // Optional
}

And then use the corresponding overload of che AddDallE method:

// Adds DALL·E service using settings from IConfiguration.
builder.Services.AddDallE(builder.Configuration);

Configuring DallENet dinamically

The AddDallE method has also an overload that accepts an IServiceProvider as argument. It can be used, for example, if we're in a Web API and we need to support scenarios in which every user has a different API Key that can be retrieved accessing a database via Dependency Injection:

builder.Services.AddDallE((services, options) =>
{
    var accountService = services.GetRequiredService<IAccountService>();

    // Dynamically gets the Resource name and the API Key from the service.
    var resourceName = "...";
    var apiKey = "..."

    options.UseAzure(resourceName, apiKey);
});

Configuring DallENet using both IConfiguration and code

In more complex scenarios, it is possible to configure DallENet using both code and IConfiguration. This can be useful if we want to set a bunch of common properties, but at the same time we need some configuration logic. For example:

builder.Services.AddDallE((services, options) =>
{
    // Configure common properties (default size, default style, ecc.) using IConfiguration.
    options.UseConfiguration(builder.Configuration);

    var accountService = services.GetRequiredService<IAccountService>();

    // Dynamically gets the Resource name and the API Key from the service.
    var resourceName = "...";
    var apiKey = "..."

    options.UseAzure(resourceName, apiKey);
});

Usage

The library can be used in any .NET application built with .NET 6.0 or later. For example, we can create a Minimal API in this way:

app.MapPost("/api/image", async (Request request, IDallEClient dallEClient) =>
{
    var response = await dallEClient.GenerateImagesAsync(request.Prompt);
    return TypedResults.Ok(response);
})
.WithOpenApi();

public record class Request(string Prompt);

In particular, the response contains the URL of the generated image. If we just want to retrieve the URL of the first generated image, we can call the GetImageUrl method:

var imageUrl = response.GetImageUrl();

Note Generated images are automatically deleted after 24 hours.

Check the Samples folder for more information about the different implementations.

Documentation

The full technical documentation is available here.

Contribute

The project is constantly evolving. Contributions are welcome. Feel free to file issues and pull requests on the repo and we'll address them as we can.

Warning Remember to work on the develop branch, don't use the master branch directly. Create Pull Requests targeting develop.