src/Services/Ordering/Ordering.API/Extensions/LinqSelectExtensions.cs

（完整代码） 1KB 

namespace Microsoft.eShopOnContainers.Services.Ordering.API.Extensions;

public static class LinqSelectExtensions
{
    public static IEnumerable<SelectTryResult<TSource, TResult>> SelectTry<TSource, TResult>(this IEnumerable<TSource> enumerable, Func<TSource, TResult> selector)
    {
        foreach (TSource element in enumerable)
        {
            SelectTryResult<TSource, TResult> returnedValue;
            try
            {
                returnedValue = new SelectTryResult<TSource, TResult>(element, selector(element), null);
            }
            catch (Exception ex)
            {
                returnedValue = new SelectTryResult<TSource, TResult>(element, default(TResult), ex);
            }
            yield return returnedValue;
        }
    }

    public static IEnumerable<TResult> OnCaughtException<TSource, TResult>(this IEnumerable<SelectTryResult<TSource, TResult>> enumerable, Func<Exception, TResult> exceptionHandler)
    {
        return enumerable.Select(x => x.CaughtException == null ? x.Result : exceptionHandler(x.CaughtException));
    }

    public static IEnumerable<TResult> OnCaughtException<TSource, TResult>(this IEnumerable<SelectTryResult<TSource, TResult>> enumerable, Func<TSource, Exception, TResult> exceptionHandler)
    {
        return enumerable.Select(x => x.CaughtException == null ? x.Result : exceptionHandler(x.Source, x.CaughtException));
    }

    public class SelectTryResult<TSource, TResult>
    {
        internal SelectTryResult(TSource source, TResult result, Exception exception)
        {
            Source = source;
            Result = result;
            CaughtException = exception;
        }

        public TSource Source { get; private set; }
        public TResult Result { get; private set; }
        public Exception CaughtException { get; private set; }
    }
}

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