47 lines
2.6 KiB
C#
47 lines
2.6 KiB
C#
using System;
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namespace EmbedIO
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{
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partial class HttpContextExtensions
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{
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/// <summary>Gets the item associated with the specified key.</summary>
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/// <typeparam name="T">The desired type of the item.</typeparam>
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/// <param name="this">The <see cref="IHttpContext"/> on which this method is called.</param>
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/// <param name="key">The key whose value to get from the <see cref="IHttpContext.Items">Items</see> dictionary.</param>
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/// <param name="value">
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/// <para>When this method returns, the item associated with the specified key,
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/// if the key is found in <see cref="IHttpContext.Items">Items</see>
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/// and the associated value is of type <typeparamref name="T"/>;
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/// otherwise, the default value for <typeparamref name="T"/>.</para>
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/// <para>This parameter is passed uninitialized.</para>
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/// </param>
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/// <returns><see langword="true"/> if the item is found and is of type <typeparamref name="T"/>;
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/// otherwise, <see langword="false"/>.</returns>
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/// <exception cref="NullReferenceException"><paramref name="this"/> is <see langword="null"/>.</exception>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is <see langword="null"/>.</exception>
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public static bool TryGetItem<T>(this IHttpContext @this, object key, out T value)
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{
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if (@this.Items.TryGetValue(key, out var item) && item is T typedItem)
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{
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value = typedItem;
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return true;
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}
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#pragma warning disable CS8653 // value is non-nullable - We are returning false, so value is undefined.
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value = default;
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#pragma warning restore CS8653
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return false;
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}
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/// <summary>Gets the item associated with the specified key.</summary>
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/// <typeparam name="T">The desired type of the item.</typeparam>
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/// <param name="this">The <see cref="IHttpContext"/> on which this method is called.</param>
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/// <param name="key">The key whose value to get from the <see cref="IHttpContext.Items">Items</see> dictionary.</param>
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/// <returns>The item associated with the specified key,
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/// if the key is found in <see cref="IHttpContext.Items">Items</see>
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/// and the associated value is of type <typeparamref name="T"/>;
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/// otherwise, the default value for <typeparamref name="T"/>.</returns>
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public static T GetItem<T>(this IHttpContext @this, object key)
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=> @this.Items.TryGetValue(key, out var item) && item is T typedItem ? typedItem : default;
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}
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} |