How to Use NuGet Packages in Azure Functions?

Using NuGet packages in Azure Functions

Azure Functions seamlessly integrates with NuGet, allowing developers to use third-party libraries to enhance their function functionality. While the Azure Functions portal lacks a built-in NuGet package management mechanism, the runtime handles references seamlessly and ensures that these libraries are available during compilation and execution.

Create project.json file for NuGet reference

To define NuGet dependencies, create a project.json file in the functions directory. Here is an example referencing version 1.1.0 of Microsoft.ProjectOxford.Face:

<code class="language-json">{
  "frameworks": {
    "net46": {
      "dependencies": {
        "Microsoft.ProjectOxford.Face": "1.1.0"
      }
    }
  }
}</code>

Manage project.json in the Azure Functions portal

To create or upload a project.json file using the Azure Functions portal, follow these steps:

1. Click "View File" in the function development section.
2. Create or upload a new file named project.json.
3. Use the example above as a template to define your package references.

Restore NuGet package

Once the project.json file is created, the package recovery process will start automatically. The log window will display a progress message similar to:

<code>正在恢复包。
正在安装Newtonsoft.Json 6.0.8。
正在安装Microsoft.ProjectOxford.Face 1.1.0。</code>

Use NuGet packages in your functions

The Azure Functions runtime automatically adds references to NuGet package assemblies. Just add the required using statements and use the types defined in the referenced package, without adding them explicitly using "#r".

Other deployment options

Azure Functions inherits the deployment options of Azure App Services. Here are some alternative ways to manage NuGet packages:

App Service Editor (Monaco)

• Access the editor through App Service settings and enable it.
• Drag and drop your project.json files into the functions folder.

SCM (Kudu) Endpoint

• Navigate to the SCM endpoint and use the debug console.
• Drag and drop your project.json files into the correct folder.

FTP

• Configure FTP and upload your project.json files to the appropriate directory.

Continuous Integration

• When automating deployment, add your project.json files to source control.
• The package recovery process will be automatically performed during function application initialization.

Precompiled assembly

• Deploy functions as compiled assemblies with dependency management in Visual Studio.
• Use the standard class library or Visual Studio 2017 Azure Functions tools.

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