Add IWebHostBuilder UseIf and UseIfElse extension methods with condition as a Func<IWebHostBuilder, bool>

Author: RehanSaeed

Source/Boxed.AspNetCore/Boxed.AspNetCore.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <PropertyGroup Label="Package">
-    <VersionPrefix>3.0.0</VersionPrefix>
+    <VersionPrefix>3.1.0</VersionPrefix>
     <Authors>Muhammad Rehan Saeed (RehanSaeed.com)</Authors>
     <Product>ASP.NET Core Framework Boxed</Product>
     <Description>Provides ASP.NET Core middleware, MVC filters, extension methods and helper code for an ASP.NET Core project.</Description>

Source/Boxed.AspNetCore/WebHostBuilderExtensions.cs

@@ -39,6 +39,37 @@ public static IWebHostBuilder UseIf(
             return hostBuilder;
         }
 
+        /// <summary>
+        /// Executes the specified action if the specified <paramref name="condition"/> is <c>true</c> which can be
+        /// used to conditionally add to the host builder.
+        /// </summary>
+        /// <param name="hostBuilder">The host builder.</param>
+        /// <param name="condition">If <c>true</c> is returned the action is executed.</param>
+        /// <param name="action">The action used to add to the host builder.</param>
+        /// <returns>The same host builder.</returns>
+        public static IWebHostBuilder UseIf(
+            this IWebHostBuilder hostBuilder,
+            Func<IWebHostBuilder, bool> condition,
+            Func<IWebHostBuilder, IWebHostBuilder> action)
+        {
+            if (hostBuilder == null)
+            {
+                throw new ArgumentNullException(nameof(hostBuilder));
+            }
+
+            if (action == null)
+            {
+                throw new ArgumentNullException(nameof(action));
+            }
+
+            if (condition(hostBuilder))
+            {
+                hostBuilder = action(hostBuilder);
+            }
+
+            return hostBuilder;
+        }
+
         /// <summary>
         /// Executes the specified <paramref name="ifAction"/> if the specified <paramref name="condition"/> is
         /// <c>true</c>, otherwise executes the <paramref name="elseAction"/>. This can be used to conditionally add to
@@ -82,5 +113,49 @@ public static IWebHostBuilder UseIfElse(
 
             return hostBuilder;
         }
+
+        /// <summary>
+        /// Executes the specified <paramref name="ifAction"/> if the specified <paramref name="condition"/> is
+        /// <c>true</c>, otherwise executes the <paramref name="elseAction"/>. This can be used to conditionally add to
+        /// the host builder.
+        /// </summary>
+        /// <param name="hostBuilder">The host builder.</param>
+        /// <param name="condition">If <c>true</c> is returned the <paramref name="ifAction"/> is executed, otherwise the
+        /// <paramref name="elseAction"/> is executed.</param>
+        /// <param name="ifAction">The action used to add to the host builder if the condition is <c>true</c>.</param>
+        /// <param name="elseAction">The action used to add to the host builder if the condition is <c>false</c>.</param>
+        /// <returns>The same host builder.</returns>
+        public static IWebHostBuilder UseIfElse(
+            this IWebHostBuilder hostBuilder,
+            Func<IWebHostBuilder, bool> condition,
+            Func<IWebHostBuilder, IWebHostBuilder> ifAction,
+            Func<IWebHostBuilder, IWebHostBuilder> elseAction)
+        {
+            if (hostBuilder == null)
+            {
+                throw new ArgumentNullException(nameof(hostBuilder));
+            }
+
+            if (ifAction == null)
+            {
+                throw new ArgumentNullException(nameof(ifAction));
+            }
+
+            if (elseAction == null)
+            {
+                throw new ArgumentNullException(nameof(elseAction));
+            }
+
+            if (condition(hostBuilder))
+            {
+                hostBuilder = ifAction(hostBuilder);
+            }
+            else
+            {
+                hostBuilder = elseAction(hostBuilder);
+            }
+
+            return hostBuilder;
+        }
     }
 }