C# ToArray conversion merged into one line with resulting array element change

Question

I am wondering if it is possible to merge ToArray conversion with resulting array single element change into one statement.

This works perfectly

var response = Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
    Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
    TemperatureC = Random.Shared.Next(-20, 55),
    Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray();

response[0].Summary = "Some text";

return response;

However this one, returns only string contained in Summary

return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
    Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
    TemperatureC = Random.Shared.Next(-20, 55),
    Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray()[0].Summary = "Some text";

Answer 1

Well, to have Linq only solution, you can try adding ternary operator:

  Summary = index == 1 
    ? "Some text" 
    : Summaries[Random.Shared.Next(Summaries.Length)]

Code:

return Enumerable
  .Range(1, 5)
  .Select(index => new WeatherForecast {
    Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
    TemperatureC = Random.Shared.Next(-20, 55),
    Summary = index == 1 
      ? "Some text" // 1st item is special one
      : Summaries[Random.Shared.Next(Summaries.Length)] // business as usual
  })
  .ToArray();

Another (more general) possibility is an extra Select in the very end:

return Enumerable
  .Range(1, 5)
   ...
   /* A lot of Linq here */
   ...
  .Select((value, index) => index == 0 
     ? "Some text"
     : value)
  .ToArray();