jiripolasek

// HashSet supports collection initializer syntax
private static readonly HashSet<string> abcCollection1 = ["a", "b", "c"];
private static readonly FrozenSet<string> abcCollection2 = ["a", "b", "c"]; // doesn't work, yet...

// example with freezer:
private static readonly FrozenSet<FileAttributes> allowedAttributes = Freeze(FileAttributes.Archive, FileAttributes.Device, FileAttributes.Hidden);
private static readonly FrozenSet<string> allowedKeywords = Freeze(StringComparer.OrdinalIgnoreCase, "squirrel", "cat", "dog");

// example without:
private static readonly FrozenSet<FileAttributes> allowedAttributesUgly = new HashSet<FileAttributes>([FileAttributes.Archive, FileAttributes.Device, FileAttributes.Hidden]).ToFrozenSet();

jiripolasek

public static class ReflectionExtensions
{
    /// <summary>
    /// Gets a value indicating whether property has init accessor declared.
    /// </summary>
    /// <param name="propertyInfo"></param>
    /// <returns>Returns <c>true</c> if the property is declared as init-only; otherwise returns <c>false</c>.</returns>
    public static bool IsInitOnly(this PropertyInfo propertyInfo)
    {
        if (propertyInfo == null)