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Code Issues

Add defaultValue overload for SelectFromCustomAttribute

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Oliver Booth 2022-04-29 11:13:59 +01:00
parent 164c4e4455
commit c0c41326fc
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GPG Key ID: 32A00B35503AF634
1 changed files with 25 additions and 2 deletions
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27
X10D/src/Reflection/MemberInfoExtensions.cs
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@ -1,4 +1,4 @@
using System.Globalization;
using System.Globalization;
using System.Reflection;
namespace X10D.Reflection;
@ -78,6 +78,29 @@ public static class MemberInfoExtensions
public static TReturn? SelectFromCustomAttribute<TAttribute, TReturn>(this MemberInfo member,
Func<TAttribute, TReturn> selector)
where TAttribute : Attribute
{
return member.SelectFromCustomAttribute(selector, default);
}
/// <summary>
/// Retrieves a custom attribute that is decorated by the current member, and projects it into to a new form.
/// </summary>
/// <typeparam name="TAttribute">The attribute type.</typeparam>
/// <typeparam name="TReturn">The return type of the <paramref name="selector" /> delegate.</typeparam>
/// <param name="member">The member.</param>
/// <param name="selector">A transform function to apply to the attribute.</param>
/// <param name="defaultValue">The default value to return when the specified attribute is not found.</param>
/// <returns>
/// An instance of <typeparamref name="TReturn" /> as provided from <paramref name="selector" />.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="member" /> is <see langword="null" />
/// -or-
/// <paramref name="selector" /> is <see langword="null" />.
/// </exception>
public static TReturn? SelectFromCustomAttribute<TAttribute, TReturn>(this MemberInfo member,
Func<TAttribute, TReturn> selector, TReturn? defaultValue)
where TAttribute : Attribute
{
if (member is null)
{
@ -91,6 +114,6 @@ public static class MemberInfoExtensions
return member.GetCustomAttribute<TAttribute>() is { } attribute
? selector(attribute)
: default;
: defaultValue;
}
}