Some interface & implementation with a single prop to store our dictionary

Author: Warren Buckley

Our.Umbraco.TagHelpers/Services/IUmbracoTagHelperCacheKeys.cs

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+using Microsoft.AspNetCore.Mvc.TagHelpers.Cache;
+using System.Collections.Generic;
+
+namespace Our.Umbraco.TagHelpers.Services
+{
+	public interface IUmbracoTagHelperCacheKeys
+	{
+		Dictionary<string, CacheTagKey> CacheKeys { get; set; }
+	}
+}

Our.Umbraco.TagHelpers/Services/UmbracoTagHelperCacheKeys.cs

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+using Microsoft.AspNetCore.Mvc.TagHelpers.Cache;
+using System.Collections.Generic;
+
+namespace Our.Umbraco.TagHelpers.Services
+{
+	public class UmbracoTagHelperCacheKeys : IUmbracoTagHelperCacheKeys
+	{
+		public Dictionary<string,CacheTagKey> CacheKeys { get; set; } = new Dictionary<string,CacheTagKey>();
+	}
+}