C#•2y ago

✅ How should I use SelectAsync?

I have this:

static public async Task<IEnumerable<TResult>> SelectAsync<TSource, TResult>(
    this IEnumerable<TSource> @this,                                         
    Func<TSource, Task<TResult>> selector) =>                                
    await Task.WhenAll(@this.Select(async x => await selector(x)             
            .ConfigureAwait(continueOnCapturedContext: false)))              
        .ConfigureAwait(continueOnCapturedContext: false);

static public async Task<IEnumerable<TResult>> SelectAsync<TSource, TResult>(
    this IEnumerable<TSource> @this,                                         
    Func<TSource, Task<TResult>> selector) =>                                
    await Task.WhenAll(@this.Select(async x => await selector(x)             
            .ConfigureAwait(continueOnCapturedContext: false)))              
        .ConfigureAwait(continueOnCapturedContext: false);

What is better way to call SelectAsync:

1.
public Task<List<ReportDefinitionDto>> ToDtos(        
    IEnumerable<ReportDefinitionModel> models,        
    CultureInfo culture) =>                           
    models.SelectAsync(model => ToDto(model, culture))
        .ToList();

1.
public Task<List<ReportDefinitionDto>> ToDtos(        
    IEnumerable<ReportDefinitionModel> models,        
    CultureInfo culture) =>                           
    models.SelectAsync(model => ToDto(model, culture))
        .ToList();

2.
public Task<List<ReportDefinitionDto>> ToDtos(        
    IEnumerable<ReportDefinitionModel> models,        
    CultureInfo culture) =>                           
    models.SelectAsync(async model => await ToDto(model, culture))
        .ToList();

2.
public Task<List<ReportDefinitionDto>> ToDtos(        
    IEnumerable<ReportDefinitionModel> models,        
    CultureInfo culture) =>                           
    models.SelectAsync(async model => await ToDto(model, culture))
        .ToList();

2 Replies

Omnissiah•2y ago

is this a mapping? do you really need it to be async?

SWEETPONYOP•2y ago

it is not simple mapping ToDto is async Task that do some async stuff

Gaming

Programming

✅ How should I use SelectAsync?