Add WhereAlso (#13)

src/CSESoftware.Repository/Builder/ExpressionExtensions.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace CSESoftware.Repository.Builder
+{
+    internal static class ExpressionExtensions
+    {
+        internal static Expression<Func<T, bool>> AndAlso<T>(this Expression<Func<T, bool>> left, Expression<Func<T, bool>> right)
+        {
+            var parameter = Expression.Parameter(typeof(T), "entity");
+
+            var leftVisitor = new ReplaceExpressionVisitor(left.Parameters.First(), parameter);
+            var leftBody = leftVisitor.Visit(left.Body);
+
+            var rightVisitor = new ReplaceExpressionVisitor(right.Parameters.First(), parameter);
+            var rightBody = rightVisitor.Visit(right.Body);
+
+            var body = Expression.AndAlso(leftBody!, rightBody!);
+
+            return Expression.Lambda<Func<T, bool>>(body, parameter);
+        }
+
+        private class ReplaceExpressionVisitor(Expression oldValue, Expression newValue) : ExpressionVisitor
+        {
+            public override Expression Visit(Expression expression)
+            {
+                return expression == oldValue ? newValue : base.Visit(expression);
+            }
+        }
+    }
+}

src/CSESoftware.Repository/Builder/QueryBuilder.cs

@@ -12,7 +12,6 @@ public class QueryBuilder<TEntity> where TEntity : class, IEntity
         protected internal readonly IQuery<TEntity> Entity;
         internal List<Ordering<TEntity>> Ordering;
 
-
         public QueryBuilder()
         {
             Entity = new Query<TEntity>
@@ -35,6 +34,12 @@ public QueryBuilder<TEntity> Where(Expression<Func<TEntity, bool>> expression)
             return this;
         }
 
+        public QueryBuilder<TEntity> WhereAlso(Expression<Func<TEntity, bool>> expression)
+        {
+            Entity.Predicate = Entity.Predicate.AndAlso(expression);
+            return this;
+        }
+
         public QueryBuilder<TEntity> OrderBy(Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> order)
         {
             Entity.OrderBy = order;

src/CSESoftware.Repository/CSESoftware.Repository.csproj

@@ -6,8 +6,8 @@
     <AssemblyName>CSESoftware.Repository</AssemblyName>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Authors>CSE Software, Inc.</Authors>
-    <Copyright>2023 CSE Software, Inc.</Copyright>
-    <Version>2.4.0</Version>
+    <Copyright>2024 CSE Software, Inc.</Copyright>
+    <Version>2.5.0</Version>
     <AssemblyVersion>2.0.0.0</AssemblyVersion>
     <Description>A generic repository pattern.</Description>
     <PackageIcon>packageIcon.png</PackageIcon>
@@ -17,6 +17,7 @@
     <RepositoryType>git</RepositoryType>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>