addressed unused warnings

Author: kccarter76

SubSonic.Core.DataAccessLayer/SubSonic.Core.DataAccessLayer.csproj

@@ -8,7 +8,7 @@
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <PackageTags>DAL;SqlServer;C#;.NetFramework;.NetCore;</PackageTags>
+    <PackageTags>DAL;Database;C#;.NetFramework;.NetCore;</PackageTags>
     <Version>4.1.1</Version>
     <PackageId>SubSonic.Core.DAL</PackageId>
     <Company>SubSonic-Core</Company>

SubSonic.Core.DataAccessLayer/src/Linq/Extensions/SubSonicQueryable/QueryableExtensions.cs

@@ -210,9 +210,37 @@ public static IQueryable<TSource> WhereNotExists<TSource>(this IQueryable<TSourc
 
             throw Error.NotSupported($"{nameof(WhereNotExists)} not supported on {source}."); ;
         }
-
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <typeparam name="TSource"></typeparam>
+        /// <param name="source"></param>
+        /// <param name="dbTable"></param>
+        /// <param name="keys"></param>
+        /// <param name="keyData"></param>
+        /// <returns></returns>
         internal static IQueryable<TSource> WhereByKeyData<TSource>(this IQueryable<TSource> source, DbTableExpression dbTable, IEnumerable<string> keys, IEnumerable<object> keyData)
         {
+            if (source is null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
+
+            if (dbTable is null)
+            {
+                throw new ArgumentNullException(nameof(dbTable));
+            }
+
+            if (keys is null)
+            {
+                throw new ArgumentNullException(nameof(keys));
+            }
+
+            if (keyData is null)
+            {
+                throw new ArgumentNullException(nameof(keyData));
+            }
+
             throw Error.NotImplemented();
         }