61 lines
2.2 KiB
C#
61 lines
2.2 KiB
C#
// Copyright (c) Umbraco.
|
|
// See LICENSE for more details.
|
|
|
|
using System;
|
|
|
|
namespace Umbraco.Extensions
|
|
{
|
|
/// <summary>
|
|
/// Extension methods for 'If' checking like checking If something is null or not null
|
|
/// </summary>
|
|
public static class IfExtensions
|
|
{
|
|
/// <summary>The if not null.</summary>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="action">The action.</param>
|
|
/// <typeparam name="TItem">The type</typeparam>
|
|
public static void IfNotNull<TItem>(this TItem item, Action<TItem> action) where TItem : class
|
|
{
|
|
if (item != null)
|
|
{
|
|
action(item);
|
|
}
|
|
}
|
|
|
|
/// <summary>The if true.</summary>
|
|
/// <param name="predicate">The predicate.</param>
|
|
/// <param name="action">The action.</param>
|
|
public static void IfTrue(this bool predicate, Action action)
|
|
{
|
|
if (predicate)
|
|
{
|
|
action();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks if the item is not null, and if so returns an action on that item, or a default value
|
|
/// </summary>
|
|
/// <typeparam name="TResult">the result type</typeparam>
|
|
/// <typeparam name="TItem">The type</typeparam>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="action">The action.</param>
|
|
/// <param name="defaultValue">The default value.</param>
|
|
/// <returns></returns>
|
|
public static TResult? IfNotNull<TResult, TItem>(this TItem? item, Func<TItem, TResult> action, TResult? defaultValue = default(TResult))
|
|
where TItem : class
|
|
=> item != null ? action(item) : defaultValue;
|
|
|
|
/// <summary>
|
|
/// Checks if the value is null, if it is it returns the value specified, otherwise returns the non-null value
|
|
/// </summary>
|
|
/// <typeparam name="TItem"></typeparam>
|
|
/// <param name="item"></param>
|
|
/// <param name="action"></param>
|
|
/// <returns></returns>
|
|
public static TItem IfNull<TItem>(this TItem? item, Func<TItem, TItem> action)
|
|
where TItem : class
|
|
=> item ?? action(item!);
|
|
}
|
|
}
|