TekH
cb641fd33a
- Introduced ThrowIfNull<T>(Task<T?>) extension method to ensure awaited result is not null, throwing NotFoundException otherwise - Added ThrowIfNull<T>(Task<IEnumerable<T>?>) extension method to validate collections, throwing NotFoundException if null or empty - Supports optional custom exception messages for better error context
40 lines
1.8 KiB
C#
40 lines
1.8 KiB
C#
using EnvelopeGenerator.Application.Exceptions;
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namespace EnvelopeGenerator.Application.Extensions;
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/// <summary>
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/// Extension methods for tasks
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/// </summary>
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public static class TaskExtensions
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{
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/// <summary>
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/// Awaits the specified task and ensures that the result is not <c>null</c>.
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/// If the result is <c>null</c>, a <see cref="NotFoundException"/> is thrown.
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/// </summary>
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/// <typeparam name="T">The type of the result.</typeparam>
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/// <param name="task">The task to await.</param>
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/// <param name="exceptionMessage">Optional custom exception message.</param>
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/// <returns>The awaited result if not <c>null</c>.</returns>
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/// <exception cref="NotFoundException">Thrown if the result is <c>null</c>.</exception>
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public static async Task<T> ThrowIfNull<T>(this Task<T?> task, string? exceptionMessage = null)
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{
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var result = await task;
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return result ?? throw new NotFoundException(exceptionMessage);
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}
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/// <summary>
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/// Awaits the specified task and ensures that the result is not <c>null</c> or empty.
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/// If the result is <c>null</c> or contains no elements, a <see cref="NotFoundException"/> is thrown.
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/// </summary>
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/// <typeparam name="T">The element type of the collection.</typeparam>
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/// <param name="task">The task to await.</param>
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/// <param name="exceptionMessage">Optional custom exception message.</param>
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/// <returns>The awaited collection if it is not <c>null</c> or empty.</returns>
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/// <exception cref="NotFoundException">Thrown if the result is <c>null</c> or empty.</exception>
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public static async Task<IEnumerable<T>> ThrowIfNull<T>(this Task<IEnumerable<T>?> task, string? exceptionMessage = null)
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{
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var result = await task;
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return result?.Any() ?? false ? result : throw new NotFoundException(exceptionMessage);
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}
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}
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