fix: properly handle value types when setting properties on dynamic objects returned by Dapper queries (#2122)

Author: alatanza

Dapper/SqlMapper.DapperRowMetaObject.cs

@@ -81,7 +81,7 @@ public override System.Dynamic.DynamicMetaObject BindSetMember(System.Dynamic.Se
                 var parameters = new System.Linq.Expressions.Expression[]
                                      {
                                          System.Linq.Expressions.Expression.Constant(binder.Name),
-                                         value.Expression,
+                                         System.Linq.Expressions.Expression.Convert(value.Expression, typeof(object)),
                                      };
 
                 var callMethod = CallMethod(setValueMethod, parameters);

tests/Dapper.Tests/MiscTests.cs

@@ -1309,9 +1309,9 @@ public HazGetOnlyAndCtor(int idProperty, string nameProperty)
                 IdProperty = idProperty;
                 NameProperty = nameProperty;
             }
-        }
-
-        [Fact]
+        }
+
+        [Fact]
         public void Issue1164_OverflowExceptionForByte()
         {
             const string sql = "select cast(200 as smallint) as [value]"; // 200 more than sbyte.MaxValue but less than byte.MaxValue 
@@ -1358,5 +1358,41 @@ public async Task QuerySplitStruct() // https://github.com/DapperLib/Dapper/issu
 
             Assert.Single(results);
         }
+
+        [Fact]
+        public void SetDynamicProperty_WithReferenceType_Succeeds()
+        {
+            var obj = connection.QueryFirst("select 1 as ExistingProperty");
+
+            obj.ExistingProperty = "foo";
+            Assert.Equal("foo", (string)obj.ExistingProperty);
+
+            obj.NewProperty = new Uri("http://example.net/");
+            Assert.Equal(new Uri("http://example.net/"), (Uri)obj.NewProperty);
+        }
+
+        [Fact]
+        public void SetDynamicProperty_WithBoxedValueType_Succeeds()
+        {
+            var obj = connection.QueryFirst("select 'foo' as ExistingProperty");
+
+            obj.ExistingProperty = (object)1;
+            Assert.Equal(1, (int)obj.ExistingProperty);
+
+            obj.NewProperty = (object)true;
+            Assert.True(obj.NewProperty);
+        }
+
+        [Fact]
+        public void SetDynamicProperty_WithValueType_Succeeds()
+        {
+            var obj = connection.QueryFirst("select 'foo' as ExistingProperty");
+
+            obj.ExistingProperty = 1;
+            Assert.Equal(1, (int)obj.ExistingProperty);
+
+            obj.NewProperty = true;
+            Assert.True(obj.NewProperty);
+        }
     }
 }