public void NoTransformationTest()
{
Expression <Func <int, int> > source = (p) => p - 2;
var actual = new TransformExpressionVisitor().VisitAndConvert(source, "");
Assert.IsNotNull(actual);
Assert.AreEqual("p => (p - 2)", actual.ToString());
}
public void TransformToDecrementTest()
{
Expression <Func <int, int> > source = (p) => p - 1;
var actual = new TransformExpressionVisitor().VisitAndConvert(source, "");
Assert.IsNotNull(actual);
Assert.AreEqual("p => Decrement(p)", actual.ToString());
}
public void ParameterIsExistExpression()
{
Expression <Func <int, int, int, int> > source = (a, b, c) => a + b + c;
var actual = new TransformExpressionVisitor().Transformation(source, new Dictionary <string, object>
{
{ "a", 21 },
//{ "b", 23 },
{ "c", 4 }
});
Console.WriteLine(actual);
}
public S Execute <S>(Expression expression)
{
TransformMappingsMergerExpressionVisitor mergerVisitor = new TransformMappingsMergerExpressionVisitor();
mergerVisitor.Visit(expression);
TransformSelectInserterExpressionVisitor selectInserterVisitor = new TransformSelectInserterExpressionVisitor(mergerVisitor.TypeMappings);
expression = selectInserterVisitor.Visit(expression);
TransformExpressionVisitor visitor = new TransformExpressionVisitor(
_source,
mergerVisitor.TypeMappings,
mergerVisitor.PropertyMappings,
mergerVisitor.SelectParameterMappings,
mergerVisitor.ContainerClassMappings);
Expression newExpression = visitor.Visit(expression);
return((S)_source.Provider.Execute(newExpression));
}
public IEnumerator <T> GetEnumerator()
{
TransformMappingsMergerExpressionVisitor mergerVisitor = new TransformMappingsMergerExpressionVisitor();
mergerVisitor.Visit(_currentExpression);
TransformSelectInserterExpressionVisitor selectInserterVisitor = new TransformSelectInserterExpressionVisitor(mergerVisitor.TypeMappings);
Expression newExpression = selectInserterVisitor.Visit(_currentExpression);
TransformExpressionVisitor visitor = new TransformExpressionVisitor(
_source,
mergerVisitor.TypeMappings,
mergerVisitor.PropertyMappings,
mergerVisitor.SelectParameterMappings,
mergerVisitor.ContainerClassMappings);
newExpression = visitor.Visit(newExpression);
IQueryable <T> queryable = (IQueryable <T>)_source.Provider.CreateQuery(newExpression);
return(queryable.GetEnumerator());
}
