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