protected override bool MatchesCore(IMatcher other)
{
var valueMatcher = (IValueMatcher)other;
var valueAsExpression = this.Value as Expression;
var otherValueAsExpression = valueMatcher.Value as Expression;
if (valueAsExpression != null && otherValueAsExpression != null)
{
valueAsExpression = ExpressionReducer.Reduce(valueAsExpression);
otherValueAsExpression = ExpressionReducer.Reduce(otherValueAsExpression);
return(ExpressionComparer.AreEqual(valueAsExpression, otherValueAsExpression));
}
if (this.Value != null && valueMatcher.Value != null)
{
var thisType = this.Value.GetType();
var otherType = valueMatcher.Value.GetType();
var thisEnumerableType = thisType.GetImplementationOfGenericInterface(typeof(IEnumerable <>));
var otherEnumerableType = otherType.GetImplementationOfGenericInterface(typeof(IEnumerable <>));
if (thisEnumerableType != null &&
thisEnumerableType == otherEnumerableType &&
IsSystemCollection(thisType) &&
IsSystemCollection(otherType))
{
var elementType = thisEnumerableType.GetGenericArguments()[0];
var sequenceEqualsMethod = typeof(Enumerable).GetMethods()
.FirstOrDefault(method => method.Name == "SequenceEqual" && method.GetParameters().Length == 2)
.MakeGenericMethod(elementType);
return((bool)sequenceEqualsMethod.Invoke(null, new object[] { this.Value, valueMatcher.Value }));
}
}
return(false);
}
public void CanParseStringEqual()
{
var expected = new FilterExpression <Entity>(e => e.FooString == "42");
var actual = Filter.Parse("FooString='42'").ToFilterExpression <Entity>();
Assert.True(ExpressionComparer.AreEqual(expected.Expression, actual.Expression));
}
public void SortByDescReflectsSortByDesc()
{
var entities = Entity.BuildEntities().AsQueryable();
var expected = entities.SortBy(e => e.Parent.Foo.Name, SortDirection.Desc).Expression;
var actual = entities.SortBy("Parent.Foo.Name", SortDirection.Desc).Expression;
Assert.True(ExpressionComparer.AreEqual(expected, actual));
}
public void EquivalentExpressionsAreEqualRegardlessOfParameterName()
{
// Note one parameter is named "a" while the other is named "b".
Expression <Func <Entity, bool> > actual = a => a.FooString == "42";
Expression <Func <Entity, bool> > expected = b => b.FooString == "42";
Assert.True(ExpressionComparer.AreEqual(expected, actual));
}
public void SortByAscMatchesOrderBy()
{
var entities = Entity.BuildEntities().AsQueryable();
var expected = entities.OrderBy(e => e.Parent.Foo.Name).Expression;
var actual = entities.SortBy("Parent.Foo.Name").Expression;
Assert.True(ExpressionComparer.AreEqual(expected, actual));
}
public bool Equals(ParameterizedExpression other)
{
if (other == null || hashCode != other.hashCode)
{
return(false);
}
return(ExpressionComparer.AreEqual(expression, other.expression));
}
private static void AssertNotEqual(Expression first, Expression second)
{
//Act
bool result = ExpressionComparer.AreEqual(first, second);
//Assert
Assert.False(result);
}
private static void AssertEqual(Expression first, Expression second)
{
//Act
bool result = ExpressionComparer.AreEqual(first, second);
//Assert
Assert.That(result, Is.True);
}
public void EquivalentExpressionsAreEqual()
{
// Note both parameters are named "e".
Expression <Func <Entity, bool> > actual = e => e.FooString == "42";
Expression <Func <Entity, bool> > expected = e => e.FooString == "42";
Assert.True(ExpressionComparer.AreEqual(expected, actual));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var e1 = xgr.MultiProject(
() => new {
FieldOne = 1,
FieldTwo = "ABC"
},
x => new InitializerOne {
IntField = x.FieldOne,
StringField = x.FieldTwo
},
_initializerOneTemplate,
x => new InitializerTwo {
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
},
_initializerTwoTemplate,
(x, y) => new {
InitializerOneResult = x,
InitializerTwoResult = y
}
);
var inputPlaceholder = xgr.FromFunc(() => new {
FieldOne = 1,
FieldTwo = "ABC"
});
var expectations = xgr.FromFunc(inputPlaceholder, x => new {
InitializerOneResult = (new InitializerOne {
IntField = x.FieldOne,
StringField = x.FieldTwo
}).StringField + (new InitializerOne
{
IntField = x.FieldOne,
StringField = x.FieldTwo
}).IntField,
InitializerTwoResult = (new InitializerTwo {
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
}).StringFieldTwo + (new InitializerTwo
{
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
}).StringFieldOne
});
var inputParam = Expression.Parameter(inputPlaceholder.ReturnType);
var expected = Expression.Lambda(
ExpressionReplacer.Replace(expectations.Body, inputPlaceholder.Body, inputParam),
inputParam
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, e1));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var e1 = xgr.MultiProject(
()=>new {
FieldOne = 1,
FieldTwo = "ABC"
},
x=>new InitializerOne {
IntField = x.FieldOne,
StringField = x.FieldTwo
},
_initializerOneTemplate,
x=>new InitializerTwo {
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
},
_initializerTwoTemplate,
(x,y)=>new {
InitializerOneResult = x,
InitializerTwoResult = y
}
);
var inputPlaceholder = xgr.FromFunc(()=>new {
FieldOne = 1,
FieldTwo = "ABC"
});
var expectations = xgr.FromFunc(inputPlaceholder, x=>new {
InitializerOneResult = (new InitializerOne {
IntField = x.FieldOne,
StringField = x.FieldTwo
}).StringField + (new InitializerOne
{
IntField = x.FieldOne,
StringField = x.FieldTwo
}).IntField,
InitializerTwoResult = (new InitializerTwo {
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
}).StringFieldTwo + (new InitializerTwo
{
StringFieldOne = x.FieldTwo + "DEF",
StringFieldTwo = "GHI" + x.FieldTwo
}).StringFieldOne
});
var inputParam = Expression.Parameter(inputPlaceholder.ReturnType);
var expected = Expression.Lambda(
ExpressionReplacer.Replace(expectations.Body, inputPlaceholder.Body, inputParam),
inputParam
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, e1));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var expr = Expression.Default(typeof(string));
var expr2 = xgr.WithType<string>(expr);
var expr3 = xgr.WithoutType(expr2);
var xcr = new ExpressionComparer();
Assert.IsTrue(xcr.AreEqual(expr, expr3));
}
public override bool Equals(IMatcher other)
{
var predicateMatcher = other as PredicateMatcher <T>;
if (predicateMatcher == null)
{
return(false);
}
return(ExpressionComparer.AreEqual(predicateExpression, predicateMatcher.predicateExpression));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var expr = Expression.Default(typeof(string));
var expr2 = xgr.WithType <string>(expr);
var expr3 = xgr.WithoutType(expr2);
var xcr = new ExpressionComparer();
Assert.IsTrue(xcr.AreEqual(expr, expr3));
}
public bool Equals(BindingExpression other)
{
if (ReferenceEquals(null, other))
{
return(false);
}
if (ReferenceEquals(this, other))
{
return(true);
}
return(ExpressionComparer.AreEqual(Expression, other.Expression));
}
public virtual void Test008()
{
var object01 = Enumerable.Range(0, 1).AsQueryable();
var object02 = Enumerable.Range(0, 1).AsQueryable();
var constant01 = Expression.Constant(object01.Where(i => i < 10));
var constant02 = Expression.Constant(object02.Where(i => i < 10));
var xc = new ExpressionComparer();
Assert.IsTrue(xc.AreEqual(constant01, constant02, (a, b) => (a == object01 && b == object02) || object.Equals(a, b)));
}
public bool Equals(AlphaCondition other)
{
if (ReferenceEquals(null, other))
{
return(false);
}
if (ReferenceEquals(this, other))
{
return(true);
}
return(ExpressionComparer.AreEqual(_expression, other._expression));
}
public void Test010()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.UnaryPlus(Expression.Default(typeof(int)));
var result = xpr.StripConvert(expr);
Assert.AreEqual(expr, result);
Assert.IsInstanceOfType(result, typeof(UnaryExpression));
Assert.IsTrue(xcr.AreEqual(Expression.UnaryPlus(Expression.Default(typeof(int))), result));
}
public void Test005()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.Convert(Expression.Convert(Expression.Default(typeof(byte)), typeof(short)), typeof(int));
var result = xpr.StripConvert(expr);
Assert.AreNotEqual(expr, result);
Assert.IsInstanceOfType(result, typeof(DefaultExpression));
Assert.IsTrue(xcr.AreEqual(Expression.Default(typeof(byte)), result));
}
private Expression VisitCorrelatedGroup(CorrelatedExpression node)
{
var groupExpression = (GroupByExpression)node.Expression;
if (_accumulatorLookup != null && _accumulatorLookup.Contains(node.CorrelationId))
{
var oldAccumulatorLookup = _accumulatorLookup;
var source = Visit(groupExpression.Source);
_accumulatorLookup = oldAccumulatorLookup;
var accumulators = new List <AccumulatorExpression>();
var fieldExpressions = new List <FieldExpression>();
var comparer = new ExpressionComparer();
foreach (var correlatedAccumulator in _accumulatorLookup[node.CorrelationId])
{
var index = accumulators.FindIndex(x => comparer.Compare((Expression)x, correlatedAccumulator.Expression));
FieldExpression fieldExpression;
if (index == -1)
{
var accumulator = (AccumulatorExpression)correlatedAccumulator.Expression;
// TODO: might not need to do any renames...
accumulator = new AccumulatorExpression(
accumulator.Type,
"__agg" + accumulators.Count,
accumulator.Serializer,
accumulator.AccumulatorType,
accumulator.Argument);
accumulators.Add(accumulator);
fieldExpression = new FieldExpression(accumulator.FieldName, accumulator.Serializer);
fieldExpressions.Add(fieldExpression);
}
else
{
fieldExpression = fieldExpressions[index];
}
_accumulatorReplacementMap[correlatedAccumulator] = fieldExpression;
}
groupExpression = new GroupByExpression(
groupExpression.Type,
source,
groupExpression.KeySelector,
accumulators.AsReadOnly());
}
return(Visit(groupExpression));
}
private Expression VisitCorrelatedGroup(CorrelatedExpression node)
{
var groupExpression = (GroupByExpression)node.Expression;
if (_accumulatorLookup != null && _accumulatorLookup.Contains(node.CorrelationId))
{
var oldAccumulatorLookup = _accumulatorLookup;
var source = Visit(groupExpression.Source);
_accumulatorLookup = oldAccumulatorLookup;
var accumulators = new List<AccumulatorExpression>();
var fieldExpressions = new List<FieldExpression>();
var comparer = new ExpressionComparer();
foreach (var correlatedAccumulator in _accumulatorLookup[node.CorrelationId])
{
var index = accumulators.FindIndex(x => comparer.Compare((Expression)x, correlatedAccumulator.Expression));
FieldExpression fieldExpression;
if (index == -1)
{
var accumulator = (AccumulatorExpression)correlatedAccumulator.Expression;
// TODO: might not need to do any renames...
accumulator = new AccumulatorExpression(
accumulator.Type,
"__agg" + accumulators.Count,
accumulator.Serializer,
accumulator.AccumulatorType,
accumulator.Argument);
accumulators.Add(accumulator);
fieldExpression = new FieldExpression(accumulator.FieldName, accumulator.Serializer);
fieldExpressions.Add(fieldExpression);
}
else
{
fieldExpression = fieldExpressions[index];
}
_accumulatorReplacementMap[correlatedAccumulator] = fieldExpression;
}
groupExpression = new GroupByExpression(
groupExpression.Type,
source,
groupExpression.KeySelector,
accumulators.AsReadOnly());
}
return Visit(groupExpression);
}
public static bool AreEqual(ExpressionMap first, ExpressionMap second)
{
if (first.Count != second.Count)
{
return(false);
}
//Assume values are sorted
var pairs = first.Zip(second, System.Tuple.Create);
bool result = pairs.All(t =>
t.Item1.Name == t.Item2.Name &&
ExpressionComparer.AreEqual(t.Item1.Expression, t.Item2.Expression));
return(result);
}
public void CompareExpression()
{
Expression <Func <int, int> > f1 = a => a;
Expression <Func <int, int> > f2 = a => a;
Expression <Func <int, int> > f3 = b => b;
Assert.IsTrue(ExpressionComparer.AreEqual(f1, f2, checkParameterNames: true));
Assert.IsTrue(ExpressionComparer.AreEqual(f1, f2, checkParameterNames: false));
Assert.IsFalse(ExpressionComparer.AreEqual(f1, f3, checkParameterNames: true));
Assert.IsTrue(ExpressionComparer.AreEqual(f1, f3, checkParameterNames: false));
f1.Evaluate(1);
Assert2.Throws <InvalidOperationException>("cache", () => f2.Evaluate(2));
}
public static bool AreEqual(ExpressionCollection first, ExpressionCollection second)
{
if (first.Count != second.Count)
{
return(false);
}
//Values must be in same order
var pairs = first.Zip(second, System.Tuple.Create);
bool result = pairs.All(t =>
t.Item1.Name == t.Item2.Name &&
ExpressionComparer.AreEqual(t.Item1.Expression, t.Item2.Expression));
return(result);
}
private void BuildBindingNode(ReteBuilderContext context, BindingElement element)
{
var node = context.BetaSource
.Sinks.OfType <BindingNode>()
.FirstOrDefault(x =>
ExpressionComparer.AreEqual(x.BindingExpression.Expression, element.Expression));
if (node == null)
{
var bindingExpression = ExpressionCompiler.CompileBindingExpression(element, context.Declarations);
node = new BindingNode(bindingExpression, element.ResultType, context.BetaSource);
}
BuildBetaMemoryNode(context, node);
context.ResetAlphaSource();
}
public override bool Equals(object obj)
{
if (obj == this)
{
return(true);
}
CacheEntry other = obj as CacheEntry;
if (other == null)
{
return(false);
}
return(ExpressionComparer.AreEqual(Expression, other.Expression, false));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var actual = xgr.FromAction(() => Console.WriteLine("hello world"));
var expected = Expression.Call(
null,
typeof(Console).GetMethod("WriteLine", new[] { typeof(string) }),
Expression.Constant("hello world")
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, actual));
}
public void Test002()
{
var xgr = new ExpressionGenerator();
var actual = xgr.FromAction(() => paramFunc <int>());
var expected = Expression.Call(
null,
typeof(ExpressionGeneratorFromActionTests).GetMethod("paramFunc").MakeGenericMethod(typeof(int)),
Expression.NewArrayInit(typeof(int))
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, actual));
}
public void Test001()
{
var xgr = new ExpressionGenerator();
var actual = xgr.FromFunc(() => Environment.GetCommandLineArgs());
var expected = Expression.Lambda <Func <string[]> >(
Expression.Call(
null,
typeof(Environment).GetMethod("GetCommandLineArgs")
)
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, actual));
}
public void Test013()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.Convert(
Expression.Convert(
Expression.Default(typeof(int)),
typeof(decimal)),
typeof(long)
);
var result = xpr.GetTrueUnderlyingType(expr);
Assert.AreEqual(result, typeof(int));
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual bool SequenceEquals(IEnumerable <Expression> x, IEnumerable <Expression> y)
{
if (x == null || y == null)
{
return(false);
}
if (x.Count() != y.Count())
{
return(false);
}
var comparer = new ExpressionComparer();
return(x.Zip(y, (l, r) => comparer.Compare(l, r)).All(r => r));
}
public void Test003()
{
var xgr = new ExpressionGenerator();
var args = GetIntArgs(1);
var actual = xgr.FromAction(args[0], a => paramFunc(a));
var expected = Expression.Call(
null,
typeof(ExpressionGeneratorFromActionTests).GetMethod("paramFunc").MakeGenericMethod(typeof(int)),
Expression.NewArrayInit(typeof(int), args.Select(a => a.Body).ToArray())
);
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, actual));
}
public void CheckExpressionComparerBehaviour()
{
// This test is just to validate how IQToolkit.ExpressionComparer behaves
var data = new int[] { 1, 3, 5, 6 };
int mod = 2;
var query1 = from entry in data.AsQueryable() where entry % mod == 0 select entry * 4;
mod = 3;
var query2 = from entry in data.AsQueryable() where entry % mod == 0 select entry * 4;
var query3 = from entry in data.AsQueryable() where entry % mod == 0 select entry * 5;
var query4 = from entry in data.AsQueryable() where entry % 2 == 0 select entry * 4;
Assert.False(ExpressionComparer.AreEqual(query1.Expression, query2.Expression)); // Different parameter value
Assert.True(ExpressionComparer.AreEqual(query1.Expression, query2.Expression, false)); // Different parameter value
Assert.True(ExpressionComparer.AreEqual(query1.Expression, query3.Expression, false)); // Different constant
Assert.False(ExpressionComparer.AreEqual(query1.Expression, query4.Expression, false)); // Constant versus parameter
}
public void Test003()
{
var xgr = new ExpressionGenerator();
var xc = new ExpressionComparer();
var e2 = xgr.WithType<int>(Expression.Default(typeof(int)));
var e3 = xgr.WithType<int>(Expression.Default(typeof(int)));
var e1 = xgr.MakeEqualityComparison(e2, e3);
var expected = Expression.Lambda<Func<bool>>(
Expression.MakeBinary(
ExpressionType.Equal,
Expression.Default(typeof(int)),
Expression.Default(typeof(int))
)
);
Assert.IsTrue(xc.AreEqual(expected, e1));
}
protected internal override Expression VisitCorrelatedGroupBy(CorrelatedGroupByExpression node)
{
if (_lookup != null && _lookup.Contains(node.CorrelationId))
{
var source = Visit(node.Source);
var accumulators = new List<SerializationExpression>();
var comparer = new ExpressionComparer();
foreach (var correlatedAccumulator in _lookup[node.CorrelationId])
{
var index = accumulators.FindIndex(x => comparer.Compare(x.Expression, correlatedAccumulator.Accumulator));
if (index == -1)
{
var serializer = _serializerRegistry.GetSerializer(correlatedAccumulator.Type);
var info = new BsonSerializationInfo(
"__agg" + accumulators.Count,
serializer,
serializer.ValueType);
var serializationExpression = new SerializationExpression(correlatedAccumulator.Accumulator, info);
accumulators.Add(serializationExpression);
_map[correlatedAccumulator] = serializationExpression;
}
else
{
_map[correlatedAccumulator] = accumulators[index];
}
}
node = node.Update(
source,
node.Id,
accumulators.OfType<Expression>());
}
return base.VisitCorrelatedGroupBy(node);
}
public override bool AreEqual(Expression left, Expression right)
{
var xc = new ExpressionComparer();
return xc.AreEqual(left, right);
}
public void Test073()
{
var xgr = new ExpressionGenerator();
var xc = new ExpressionComparer();
var e2 = xgr.WithType<int>(Expression.Default(typeof(int)));
var e3 = xgr.WithType<int>(Expression.Default(typeof(int)));
var e1 = xgr.MakeBinary(e2, ExpressionType.Add, e3);
var expected = Expression.MakeBinary(
ExpressionType.Add,
Expression.Default(typeof(int)),
Expression.Default(typeof(int))
);
Assert.IsTrue(xc.AreEqual(expected, e1));
}
public void Test005()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.Convert(Expression.Convert(Expression.Default(typeof(byte)), typeof(short)), typeof(int));
var result = xpr.StripConvert(expr);
Assert.AreNotEqual(expr, result);
Assert.IsInstanceOfType(result, typeof(DefaultExpression));
Assert.IsTrue(xcr.AreEqual(Expression.Default(typeof(byte)), result));
}
public void Test013()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.Convert(
Expression.Convert(
Expression.Default(typeof(int)),
typeof(decimal)),
typeof(long)
);
var result = xpr.GetTrueUnderlyingType(expr);
Assert.AreEqual(result, typeof(int));
}
public void Test010()
{
var xpr = new ExpressionReader();
var xcr = new ExpressionComparer();
var expr = Expression.UnaryPlus(Expression.Default(typeof(int)));
var result = xpr.StripConvert(expr);
Assert.AreEqual(expr, result);
Assert.IsInstanceOfType(result, typeof(UnaryExpression));
Assert.IsTrue(xcr.AreEqual(Expression.UnaryPlus(Expression.Default(typeof(int))), result));
}
public override bool AreEqual(Dictionary<ParameterExpression, ParameterExpression> mapping, Expression left, Expression right)
{
var xc = new ExpressionComparer();
return xc.AreEqual(mapping, left, right);
}
public void Test004()
{
var xgr = new ExpressionGenerator();
var q = Enumerable.Range(0, 1).Select(x => new {
FieldOne = 1,
FieldTwo = "ABC"
}).AsQueryable();
var e1 = xgr.MultiProject(
q,
x => x.FieldTwo + x.FieldOne,
x => "GHI" + x.FieldTwo + x.FieldTwo + "DEF",
(x, y) => new {
InitializerOneResult = x,
InitializerTwoResult = y
}
);
var inputPlaceholder = xgr.FromFunc(() => new {
FieldOne = 1,
FieldTwo = "ABC"
});
var expectations = xgr.FromFunc(inputPlaceholder, x => new {
InitializerOneResult = x.FieldTwo + x.FieldOne,
InitializerTwoResult = "GHI" + x.FieldTwo + x.FieldTwo + "DEF"
});
var inputParam = Expression.Parameter(inputPlaceholder.ReturnType);
var expected = Expression.Lambda(
ExpressionReplacer.Replace(expectations.Body, inputPlaceholder.Body, inputParam),
inputParam
);
var inner1 = e1.Expression as MethodCallExpression;
var inner2 = inner1.Arguments[1] as UnaryExpression;
var inner3 = inner2.Operand as LambdaExpression;
var comparer = new ExpressionComparer();
Assert.IsTrue(comparer.AreEqual(expected, inner3));
}
public void Test093()
{
var xgr = new ExpressionGenerator();
var xc = new ExpressionComparer();
var e2 = xgr.WithType<bool>(Expression.Default(typeof(bool)));
var e3 = xgr.WithType<bool>(Expression.Default(typeof(bool)));
var e1 = xgr.MakeOrElse(e2, e3);
var expected = Expression.MakeBinary(
ExpressionType.OrElse,
Expression.Default(typeof(bool)),
Expression.Default(typeof(bool))
);
Assert.IsTrue(xc.AreEqual(expected, e1));
}
public void Test082()
{
var xgr = new ExpressionGenerator();
var xc = new ExpressionComparer();
var e2 = xgr.WithType<bool?>(Expression.Default(typeof(bool?)));
var e3 = xgr.WithType<bool>(Expression.Default(typeof(bool)));
var e1 = xgr.MakeAndAlso(e2, e3);
var expected = Expression.MakeBinary(
ExpressionType.AndAlso,
Expression.Default(typeof(bool?)),
Expression.Convert(Expression.Default(typeof(bool)), typeof(bool?))
);
Assert.IsTrue(xc.AreEqual(expected, e1));
}