ProductLookup result = new Product(42, "Mechanical keyboard");
 
string message = result switch
{
    Product product => $"Found {product.Name}",
    ProductNotFound missing => $"No product with ID {missing.Id}",
};
 
Console.WriteLine(message);
 
public sealed record Product(int Id, string Name);
public sealed record ProductNotFound(int Id);
public union ProductLookup(Product, ProductNotFound);

HashSet<string> names =
    [with(StringComparer.OrdinalIgnoreCase), "Alice", "ALICE", "Bob"];
 
Console.WriteLine(names.Count);

<PropertyGroup>
  <Features>runtime-async=on</Features>
</PropertyGroup>

// Automatic backing field with custom logic
public string Name
{
    get => field;
    set => field = value?.Trim() ?? string.Empty;
}

// Extension properties for any type
static class ListExtensions
{
    extension(List<int> @this)
    {
        public int Sum => @this.Aggregate(0, (a, b) => a + b);
    }
}

// Create agents with minimal code
AIAgent writer = new ChatClientAgent(
    chatClient,
    new ChatClientAgentOptions
    {
        Name = "Writer",
        Instructions = "Write engaging, creative stories."
    });
 
// Orchestrate in workflows
AIAgent editor = new ChatClientAgent(chatClient, /* ... */);
Workflow workflow = AgentWorkflowBuilder.BuildSequential(writer, editor);
AIAgent workflowAgent = await workflow.AsAgentAsync();

dotnet new install Microsoft.Agents.AI.ProjectTemplates
dotnet new aiagent-webapi -o MyAIAgentWebApi
cd MyAIAgentWebApi
dotnet run

// Map an AG-UI endpoint for the publisher agent at /publisher/ag-ui
app.MapAGUI("publisher/ag-ui", publisherAgent)

// Use any AI provider with the same interface
IChatClient chatClient = new AzureOpenAIClient(endpoint, credential)
    .AsChatClient("gpt-4o");
 
var response = await chatClient.CompleteAsync("Explain quantum computing");
Console.WriteLine(response.Message);

dotnet new install Microsoft.Extensions.AI.Templates
dotnet new mcpserver -n MyMcpServer

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
        xmlns:models="clr-namespace:MyApp.Models"
        xmlns:controls="clr-namespace:MyApp.Controls"
        x:Class="MyApp.MainPage">
    <controls:TagView x:DataType="models:Tag" />
</ContentPage>

<ContentPage x:Class="MyApp.MainPage">
    <TagView x:DataType="Tag" />
</ContentPage>

var result = await MediaPicker.PickMultipleAsync(new MediaPickerOptions
{
    MaximumWidth = 1024,
    MaximumHeight = 768
});

// Update Views count in JSON column
await context.Blogs.ExecuteUpdateAsync(s =>
    s.SetProperty(b => b.Details.Views, b => b.Details.Views + 1));