在Unity中使用Init关键字

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Unity所使用的C#版本过低，但引入一段代码，就能为属性应用Init关键字。

CompilerServices.cs

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namespace System.Runtime.CompilerServices
{
    public static class IsExternalInit
    {
    }

    //
    // Summary:
    //     Specifies that a type has required members or that a member is required.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
    public sealed class RequiredMemberAttribute : Attribute
    {
        //
        // Summary:
        //     Initializes a System.Runtime.CompilerServices.RequiredMemberAttribute instance
        //     with default values.
        public RequiredMemberAttribute() { }
    }

    /// <summary>
    /// Indicates that compiler support for a particular feature is required for the location where this attribute is applied.
    /// </summary>
    [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false)]
    public sealed class CompilerFeatureRequiredAttribute : Attribute
    {
        public CompilerFeatureRequiredAttribute(string featureName)
        {
            FeatureName = featureName;
        }

        /// <summary>
        /// The name of the compiler feature.
        /// </summary>
        public string FeatureName { get; }

        /// <summary>
        /// If true, the compiler can choose to allow access to the location where this attribute is applied if it does not understand <see cref="FeatureName"/>.
        /// </summary>
        public bool IsOptional { get; init; }

        /// <summary>
        /// The <see cref="FeatureName"/> used for the ref structs C# feature.
        /// </summary>
        public const string RefStructs = nameof(RefStructs);

        /// <summary>
        /// The <see cref="FeatureName"/> used for the required members C# feature.
        /// </summary>
        public const string RequiredMembers = nameof(RequiredMembers);
    }
}