public void TestPredicateTree()
{
var builder = new PredicateTreeBuilder(typeof(Dto));
builder.Has("Id", ExpressionOperator.Equals, 1)
.And("Name", ExpressionOperator.IsNotNullOrEmpty, null)
.And(inner => inner
.Has("Birthdate.Year", ExpressionOperator.LessThanOrEqual, 2000)
.Or("TimeSince.Hours", ExpressionOperator.GreaterThan, 1))
.Or("Active", ExpressionOperator.DoesNotEqual, false);
var e = new ExpressionNodeVisitor().VisitLambda <Dto>(
builder.RootNode,
new PredicateBuilderConfiguration()
.WithItParameterName("x")
);
Expression <Func <Dto, bool> > testExpression = (Dto x) =>
((x.Id == 1 && !(x.Name == "" || x.Name == null)) && (x.Birthdate.Year <= 2000 || x.TimeSince.Hours > 1)) || x.Active != true;
Assert.AreEqual(
testExpression.ToString(),
e.ToString());
Assert.True(testExpression.CheckEquals(e));
}
public void TestDynamicProjection()
{
var data = new List <Model>
{
new Model()
{
Id = 1, Name = "Name1"
},
new Model()
{
Id = 2, Name = "Name2"
},
new Model()
{
Id = 3, Name = "Name3"
},
};
var dp = new ProjectionBuilder(typeof(Model), null)
.Auto("Active")
.Member("Id", map => map
.FromExpression("Id"))
.Member("Descr", map => map
.FromExpression("Name"))
.Member("CodeDescr", map => map
.FromExpression("Id.ToString() + \" - \" + Name"))
.Member("Constant", map => map
.FromValue(5))
.BuildWithDynamicType("DynamicProjectionTestDto");
var predicateTreeBuilder =
new PredicateTreeBuilder(typeof(Model))
.Has("Id", ExpressionOperator.Equals, 1)
.Or("CodeDescr", ExpressionOperator.IsNotNullOrEmpty, null)
.Or("Descr.Length", ExpressionOperator.GreaterThan, 1)
.Or("Active", ExpressionOperator.DoesNotEqual, false);
var q = dp.BuildQuery(
data.AsQueryable(),
new[] { "Id", "Descr" },
predicateTreeBuilder.RootNode)
.ToList();
}
