Implemented Expression untyped setter istead of PropertyInfo.SetValue.

Author: Oren (electricessence)

Extensions.cs

@@ -3,6 +3,8 @@
 using System.Data;
 using System.Data.Common;
 using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Threading.Tasks.Dataflow;
@@ -24,6 +26,20 @@ internal static bool IsStillAlive<T>(this ITargetBlock<T> task)
 			return IsStillAlive(task.Completion);
 		}
 
+		// https://stackoverflow.com/questions/17660097/is-it-possible-to-speed-this-method-up/17669142#17669142
+		internal static Action<T, object> BuildUntypedSetter<T>(this PropertyInfo propertyInfo)
+		{
+			var targetType = propertyInfo.DeclaringType;
+			var methodInfo = propertyInfo.GetSetMethod();
+			var exTarget = Expression.Parameter(targetType, "t");
+			var exValue = Expression.Parameter(typeof(object), "p");
+			var exBody = Expression.Call(exTarget, methodInfo,
+			   Expression.Convert(exValue, propertyInfo.PropertyType));
+			var lambda = Expression.Lambda<Action<T, object>>(exBody, exTarget, exValue);
+			var action = lambda.Compile();
+			return action;
+		}
+
 		internal static object DBNullValueToNull(object value)
 			=> value == DBNull.Value ? null : value;
 

Open.Database.Extensions.csproj

@@ -11,10 +11,10 @@
     <Description>Useful set of utilities and abstractions for simplifying modern database operations and ensuring DI compatibility.</Description>
     <RepositoryUrl>https://github.com/electricessence/Open.Database.Extensions</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
-    <Version>5.5.0</Version>
-    <AssemblyVersion>5.5.0.0</AssemblyVersion>
-    <FileVersion>5.5.0.0</FileVersion>
-    <PackageReleaseNotes>Added ExecuteReturn and ExecuteReturnAsync for acquiring a single value from a return parameter.</PackageReleaseNotes>
+    <Version>5.5.1</Version>
+    <AssemblyVersion>5.5.1.0</AssemblyVersion>
+    <FileVersion>5.5.1.0</FileVersion>
+    <PackageReleaseNotes>Implemented Expression untyped setter istead of PropertyInfo.SetValue.</PackageReleaseNotes>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">

Transformer.cs

@@ -59,7 +59,7 @@ public Processor(Transformer<T> transformer, string[] names = null)
 							var name = _names[i];
 							var value = record[i];
 							if (value == DBNull.Value) value = null;
-							p.SetValue(model, value);
+							p(model, value);
 						}
 					}
 
@@ -72,7 +72,7 @@ public Processor(Transformer<T> transformer, string[] names = null)
 			public readonly Transformer<T> Transformer;
 
 			string[] _names;
-			PropertyInfo[] _properties;
+			Action<T, object>[] _properties;
 
 			public readonly Func<object[], T> Transform; // Using a Func<object[],T> for better type inferrence.
 
@@ -81,7 +81,7 @@ public void SetNames(string[] names)
 				var map = Transformer.ColumnToPropertyMap;
 				_names = names;
 				_properties = names
-					.Select(n => map.TryGetValue(n.ToLowerInvariant(), out PropertyInfo p) ? p : null)
+					.Select(n => map.TryGetValue(n.ToLowerInvariant(), out PropertyInfo p) ? p.BuildUntypedSetter<T>() : null)
 					.ToArray();
 			}