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Modify TryGetAttributes to return a IReadOnlyList

This commit is contained in:
Pranav K 2015-12-28 13:12:39 -08:00
parent dbe4ce06f2
commit 77b74b0c96
2 changed files with 11 additions and 6 deletions
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15
src/Microsoft.AspNet.Razor.Runtime/TagHelpers/ReadOnlyTagHelperAttributeList.cs
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@ -4,7 +4,6 @@
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace Microsoft.AspNet.Razor.TagHelpers
{
@ -17,6 +16,13 @@ namespace Microsoft.AspNet.Razor.TagHelpers
public class ReadOnlyTagHelperAttributeList<TAttribute> : IReadOnlyList<TAttribute>
where TAttribute : IReadOnlyTagHelperAttribute
{
private static readonly IReadOnlyList<TAttribute> EmptyList =
#if NET451
new TAttribute[0];
#else
Array.Empty<TAttribute>();
#endif
/// <summary>
/// Instantiates a new instance of <see cref="ReadOnlyTagHelperAttributeList{TAttribute}"/> with an empty
/// collection.
@ -190,12 +196,11 @@ namespace Microsoft.AspNet.Razor.TagHelpers
/// <param name="name">The <see cref="IReadOnlyTagHelperAttribute.Name"/> of the
/// <typeparamref name="TAttribute"/>s to get.</param>
/// <param name="attributes">When this method returns, the <typeparamref name="TAttribute"/>s with
/// <see cref="IReadOnlyTagHelperAttribute.Name"/> matching <paramref name="name"/>, if at least one is
/// found; otherwise, <c>null</c>.</param>
/// <see cref="IReadOnlyTagHelperAttribute.Name"/> matching <paramref name="name"/>.</param>
/// <returns><c>true</c> if at least one <typeparamref name="TAttribute"/> with the same
/// <see cref="IReadOnlyTagHelperAttribute.Name"/> exists in the collection; otherwise, <c>false</c>.</returns>
/// <remarks><paramref name="name"/> is compared case-insensitively.</remarks>
public bool TryGetAttributes(string name, out IEnumerable<TAttribute> attributes)
public bool TryGetAttributes(string name, out IReadOnlyList<TAttribute> attributes)
{
if (name == null)
{
@ -216,7 +221,7 @@ namespace Microsoft.AspNet.Razor.TagHelpers
matchedAttributes.Add(Attributes[i]);
}
}
attributes = matchedAttributes ?? Enumerable.Empty<TAttribute>();
attributes = matchedAttributes ?? EmptyList;
return matchedAttributes != null;
}

2
test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/ReadOnlyTagHelperAttributeListTest.cs
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@ -587,7 +587,7 @@ namespace Microsoft.AspNet.Razor.TagHelpers
{
// Arrange
var attributes = new ReadOnlyTagHelperAttributeList<IReadOnlyTagHelperAttribute>(initialAttributes);
IEnumerable<IReadOnlyTagHelperAttribute> resolvedAttributes;
IReadOnlyList<IReadOnlyTagHelperAttribute> resolvedAttributes;
// Act
var result = attributes.TryGetAttributes(nameToLookup, out resolvedAttributes);