Updating remote Function App Application Settings in C#

Question

I am currently writing a scheduled Function App that in part will need to update an Application Setting of a different Function App on which I have given the Service Principal access. The Function App that I need to update is hosted within the same App Service Plan.

I understand that I can achieve this through Powershell using the az functionapp config appsettings set cmdlet but I wanted to know if this is possible in C#

Answer 1

Looks like it is possible using the Microsoft.Azure.Management.AppService.Fluent and Microsoft.Azure.Management.ResourceManager.Fluent extension libraries which are wrappers around the REST calls.

using Microsoft.Azure.Management.AppService.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent.Core;
using System;
using System.Threading.Tasks;

namespace Azure_Storage_Account_Key_Rotation
{
    internal async Task UpdateApplicationSetting(string appServiceResourceGroupName, string appServiceName, string appSettingName, string appSettingValue)
    {
        var credentials = SdkContext.AzureCredentialsFactory.FromServicePrincipal(Environment.GetEnvironmentVariable("AZURE_CLIENT_ID"),
                                                                                    Environment.GetEnvironmentVariable("AZURE_CLIENT_SECRET"),
                                                                                    Environment.GetEnvironmentVariable("AZURE_TENANT_ID"),
                                                                                    AzureEnvironment.AzureGlobalCloud);

        RestClient restClient = RestClient.Configure()
                                    .WithEnvironment(AzureEnvironment.AzureGlobalCloud)
                                    .WithLogLevel(HttpLoggingDelegatingHandler.Level.Basic)
                                    .WithCredentials(credentials)
                                    .Build();

        WebSiteManagementClient webSiteManagementClient = new WebSiteManagementClient(restClient) { SubscriptionId = Environment.GetEnvironmentVariable("AZURE_SUBSCRIPTION_ID") };

        var appServiceSettings = await webSiteManagementClient.WebApps.ListApplicationSettingsAsync(appServiceResourceGroupName, appServiceName);

        if (appServiceSettings.Properties.ContainsKey(appSettingName))
        {
            appServiceSettings.Properties[appSettingName] = appSettingValue;
            await webSiteManagementClient.WebApps.UpdateApplicationSettingsAsync(appServiceResourceGroupName, appServiceName, appServiceSettings);
        }
    }
}