Adds <our-version> to help display/print out assembly version of Website or given Assembly

Author: Warren Buckley

Our.Umbraco.TagHelpers/VersionTagHelper.cs

@@ -0,0 +1,46 @@
+using Microsoft.AspNetCore.Razor.TagHelpers;
+using System;
+using System.Linq;
+using System.Reflection;
+
+namespace Our.Umbraco.TagHelpers
+{
+    /// <summary>
+    /// Used to print out the current version of the Assembly Name
+    /// Only Assemblies loaded into the Current AppDomain can be looked up
+    /// </summary>
+    [HtmlTargetElement("our-version")]
+    public class VersionTagHelper : TagHelper
+    {
+        /// <summary>
+        /// Name of assembly to lookup minus the .dll extension
+        /// 'Our.Umbraco.TagHelpers'
+        /// </summary>
+        [HtmlAttributeName("assembly")]
+        public string AssemblyName { get; set; } = string.Empty;
+
+        public override void Process(TagHelperContext context, TagHelperOutput output)
+        {
+            output.TagName = "";
+
+            // If no Assembly name set on attribute
+            // Then use the 
+            if (string.IsNullOrEmpty(AssemblyName))
+            {
+                var siteAssembly = Assembly.GetEntryAssembly();
+                var version = siteAssembly?.GetName().Version;
+                output.Content.SetHtmlContent(version.ToString());
+                return;
+            }
+
+            var allAssemblies = AppDomain.CurrentDomain.GetAssemblies();
+            var findAssembly = allAssemblies.SingleOrDefault(x => x.GetName().Name == AssemblyName);
+            if(findAssembly == null)
+            {
+                output.SuppressOutput();
+                return;
+            }
+            output.Content.SetHtmlContent(findAssembly.GetName().Version.ToString());
+        }
+    }
+}