C# .NET Project Templates: Use explicit type instead of var

[jaliyaudagedara]

I am sorry if this is not the place to bring this up.

All the different C# .NET project templates (ASP.NET Core, Azure Functions etc.) creates templated code with incorrect use of var.

Official .NET Coding Conventions nicely explains when to use var.

But we don't seem to follow that on C# .NET project templates.

For an example, consider the following examples.

1. ASP.NET Core Web API template.

// We can't determine what type the builder is by looking at right side
var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// Same here
var app = builder.Build();

// code emitted for brevity

2. Azure Function Template

// We can't determine what type the host is by looking at right side
var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureServices(services =>
    {
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
    })
    .Build();

// code emitted for brevity

3. Worker Service

// What's the type of the builder
var builder = Host.CreateApplicationBuilder(args);
builder.Services.AddHostedService<Worker>();

// Same
var host = builder.Build();

Describe the solution you'd like.

I am suggesting we follow the standard C# coding conventions.

1. ASP.NET Core Web API template.

// It's more readable
WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// It's more readable
WebApplication app = builder.Build();

2. Azure Function Template

// It's more readable
IHost host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureServices(services =>
    {
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
    })
    .Build();

3. Worker Service

// It's more readable
HostApplicationBuilder builder = Host.CreateApplicationBuilder(args);
builder.Services.AddHostedService<Worker>();

// It's more readable
IHost host = builder.Build();

Additional context

No response