Azure.ResourceManager.DurableTask (.NET)

Authentication

using Azure.Identity;
using Azure.ResourceManager;
using Azure.ResourceManager.DurableTask;

// Always use DefaultAzureCredential
var credential = new DefaultAzureCredential();
var armClient = new ArmClient(credential);

// Get subscription
var subscriptionId = Environment.GetEnvironmentVariable("AZURE_SUBSCRIPTION_ID");
var subscription = armClient.GetSubscriptionResource(
    new ResourceIdentifier($"/subscriptions/{subscriptionId}"));

Resource Hierarchy

ArmClient
└── SubscriptionResource
    └── ResourceGroupResource
        └── DurableTaskSchedulerResource
            ├── DurableTaskHubResource
            └── DurableTaskRetentionPolicyResource

Core Workflow

1. Create Durable Task Scheduler

using Azure.ResourceManager.DurableTask;
using Azure.ResourceManager.DurableTask.Models;

// Get resource group
var resourceGroup = await subscription
    .GetResourceGroupAsync("my-resource-group");

// Define scheduler with Dedicated SKU
var schedulerData = new DurableTaskSchedulerData(AzureLocation.EastUS)
{
    Properties = new DurableTaskSchedulerProperties
    {
        Sku = new DurableTaskSchedulerSku(DurableTaskSchedulerSkuName.Dedicated)
        {
            Capacity = 1  // Number of instances
        },
        // Optional: IP allowlist for network security
        IPAllowlist = { "10.0.0.0/24", "192.168.1.0/24" }
    }
};

// Create scheduler (long-running operation)
var schedulerCollection = resourceGroup.Value.GetDurableTaskSchedulers();
var operation = await schedulerCollection.CreateOrUpdateAsync(
    WaitUntil.Completed,
    "my-scheduler",
    schedulerData);

DurableTaskSchedulerResource scheduler = operation.Value;
Console.WriteLine($"Scheduler created: {scheduler.Data.Name}");
Console.WriteLine($"Endpoint: {scheduler.Data.Properties.Endpoint}");

2. Create Scheduler with Consumption SKU

// Consumption SKU (serverless)
var consumptionSchedulerData = new DurableTaskSchedulerData(AzureLocation.EastUS)
{
    Properties = new DurableTaskSchedulerProperties
    {
        Sku = new DurableTaskSchedulerSku(DurableTaskSchedulerSkuName.Consumption)
        // No capacity needed for consumption
    }
};

var operation = await schedulerCollection.CreateOrUpdateAsync(
    WaitUntil.Completed,
    "my-serverless-scheduler",
    consumptionSchedulerData);

3. Create Task Hub

// Task hubs are created under a scheduler
var taskHubData = new DurableTaskHubData
{
    // Properties are optional for basic task hub
};

var taskHubCollection = scheduler.GetDurableTaskHubs();
var hubOperation = await taskHubCollection.CreateOrUpdateAsync(
    WaitUntil.Completed,
    "my-taskhub",
    taskHubData);

DurableTaskHubResource taskHub = hubOperation.Value;
Console.WriteLine($"Task Hub created: {taskHub.Data.Name}");

4. List Schedulers

// List all schedulers in subscription
await foreach (var sched in subscription.GetDurableTaskSchedulersAsync())
{
    Console.WriteLine($"Scheduler: {sched.Data.Name}");
    Console.WriteLine($"  Location: {sched.Data.Location}");
    Console.WriteLine($"  SKU: {sched.Data.Properties.Sku?.Name}");
    Console.WriteLine($"  Endpoint: {sched.Data.Properties.Endpoint}");
}

// List schedulers in resource group
var schedulers = resourceGroup.Value.GetDurableTaskSchedulers();
await foreach (var sched in schedulers.GetAllAsync())
{
    Console.WriteLine($"Scheduler: {sched.Data.Name}");
}

5. Get Scheduler by Name

// Get existing scheduler
var existingScheduler = await schedulerCollection.GetAsync("my-scheduler");
Console.WriteLine($"Found: {existingScheduler.Value.Data.Name}");

// Or use extension method
var schedulerResource = armClient.GetDurableTaskSchedulerResource(
    DurableTaskSchedulerResource.CreateResourceIdentifier(
        subscriptionId,
        "my-resource-group",
        "my-scheduler"));
var scheduler = await schedulerResource.GetAsync();

6. Update Scheduler

// Get current scheduler
var scheduler = await schedulerCollection.GetAsync("my-scheduler");

// Update with new configuration
var updateData = new DurableTaskSchedulerData(scheduler.Value.Data.Location)
{
    Properties = new DurableTaskSchedulerProperties
    {
        Sku = new DurableTaskSchedulerSku(DurableTaskSchedulerSkuName.Dedicated)
        {
            Capacity = 2  // Scale up
        },
        IPAllowlist = { "10.0.0.0/16" }  // Update IP allowlist
    }
};

var updateOperation = await schedulerCollection.CreateOrUpdateAsync(
    WaitUntil.Completed,
    "my-scheduler",
    updateData);

7. Delete Resources

// Delete task hub first
var taskHub = await scheduler.GetDurableTaskHubs().GetAsync("my-taskhub");
await taskHub.Value.DeleteAsync(WaitUntil.Completed);

// Then delete scheduler
await scheduler.DeleteAsync(WaitUntil.Completed);

8. Manage Retention Policies

// Get retention policy collection
var retentionPolicies = scheduler.GetDurableTaskRetentionPolicies();

// Create or update retention policy
var retentionData = new DurableTaskRetentionPolicyData
{
    Properties = new DurableTaskRetentionPolicyProperties
    {
        // Configure retention settings
    }
};

var retentionOperation = await retentionPolicies.CreateOrUpdateAsync(
    WaitUntil.Completed,
    "default",  // Policy name
    retentionData);

Key Types Reference

SKU Options

Extension Methods

The SDK provides extension methods on SubscriptionResource and ResourceGroupResource:

// On SubscriptionResource
subscription.GetDurableTaskSchedulers();           // List all in subscription
subscription.GetDurableTaskSchedulersAsync();      // Async enumerable

// On ResourceGroupResource
resourceGroup.GetDurableTaskSchedulers();          // Get collection
resourceGroup.GetDurableTaskSchedulerAsync(name);  // Get by name

// On ArmClient
armClient.GetDurableTaskSchedulerResource(id);     // Get by resource ID
armClient.GetDurableTaskHubResource(id);           // Get task hub by ID

Best Practices

1. Use WaitUntil.Completed for operations that must finish before proceeding
2. Use WaitUntil.Started when you want to poll manually or run operations in parallel
3. Always use DefaultAzureCredential — never hardcode keys
4. Handle RequestFailedException for ARM API errors
5. Use CreateOrUpdateAsync for idempotent operations
6. Delete task hubs before schedulers — schedulers with task hubs cannot be deleted
7. Use IP allowlists for network security in production

Error Handling

using Azure;

try
{
    var operation = await schedulerCollection.CreateOrUpdateAsync(
        WaitUntil.Completed, schedulerName, schedulerData);
}
catch (RequestFailedException ex) when (ex.Status == 409)
{
    Console.WriteLine("Scheduler already exists");
}
catch (RequestFailedException ex) when (ex.Status == 404)
{
    Console.WriteLine("Resource group not found");
}
catch (RequestFailedException ex)
{
    Console.WriteLine($"ARM Error: {ex.Status} - {ex.ErrorCode}: {ex.Message}");
}

Complete Example

using Azure;
using Azure.Identity;
using Azure.ResourceManager;
using Azure.ResourceManager.DurableTask;
using Azure.ResourceManager.DurableTask.Models;
using Azure.ResourceManager.Resources;

// Setup
var credential = new DefaultAzureCredential();
var armClient = new ArmClient(credential);

var subscriptionId = Environment.GetEnvironmentVariable("AZURE_SUBSCRIPTION_ID")!;
var resourceGroupName = Environment.GetEnvironmentVariable("AZURE_RESOURCE_GROUP")!;

var subscription = armClient.GetSubscriptionResource(
    new ResourceIdentifier($"/subscriptions/{subscriptionId}"));
var resourceGroup = await subscription.GetResourceGroupAsync(resourceGroupName);

// Create scheduler
var schedulerData = new DurableTaskSchedulerData(AzureLocation.EastUS)
{
    Properties = new DurableTaskSchedulerProperties
    {
        Sku = new DurableTaskSchedulerSku(DurableTaskSchedulerSkuName.Dedicated)
        {
            Capacity = 1
        }
    }
};

var schedulerCollection = resourceGroup.Value.GetDurableTaskSchedulers();
var schedulerOp = await schedulerCollection.CreateOrUpdateAsync(
    WaitUntil.Completed, "my-scheduler", schedulerData);
var scheduler = schedulerOp.Value;

Console.WriteLine($"Scheduler endpoint: {scheduler.Data.Properties.Endpoint}");

// Create task hub
var taskHubData = new DurableTaskHubData();
var taskHubOp = await scheduler.GetDurableTaskHubs().CreateOrUpdateAsync(
    WaitUntil.Completed, "my-taskhub", taskHubData);
var taskHub = taskHubOp.Value;

Console.WriteLine($"Task Hub: {taskHub.Data.Name}");

// Cleanup
await taskHub.DeleteAsync(WaitUntil.Completed);
await scheduler.DeleteAsync(WaitUntil.Completed);

Related SDKs

Source Reference

• GitHub: Azure.ResourceManager.DurableTask
• NuGet: Azure.ResourceManager.DurableTask