public void ClientMethodsGuardedByEnumerable()
{
var source = new Mock<IQueryable<string>>().Object;
var binder = new QueryBinderAccessor();
var lambda = Expression.Lambda(
Expression.Constant(true),
Expression.Parameter(typeof(string)));
var whereMethod = Expression.Call(
new Func<IQueryable<object>, Expression<Func<object, bool>>, IQueryable<object>>(
Queryable.Where).Method
.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(string)),
Expression.Constant(source),
Expression.Quote(lambda));
var resultExpression = binder.AccessVisitMethodCall(whereMethod);
var resultAsMethodCall = resultExpression as MethodCallExpression;
Assert.IsInstanceOf<MethodCallExpression>(resultAsMethodCall.Arguments[0]);
Assert.AreSame(
new Func<IEnumerable<object>, IQueryable<object>>(Queryable.AsQueryable)
.Method.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(string)),
((MethodCallExpression)resultAsMethodCall.Arguments[0]).Method);
Assert.IsInstanceOf<MethodCallExpression>(
((MethodCallExpression)resultAsMethodCall.Arguments[0]).Arguments[0]);
Assert.AreSame(
new Func<IEnumerable<object>, IEnumerable<object>>(Enumerable.AsEnumerable)
.Method.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(string)),
((MethodCallExpression)((MethodCallExpression)resultAsMethodCall.Arguments[0]).Arguments[0]).Method);
}
public void WhereMethodNotTranslatable()
{
var source = new Mock<IQueryable<string>>().Object;
var binder = new QueryBinderAccessor();
var lambda = Expression.Lambda(
Expression.Constant(true),
Expression.Parameter(typeof(string)));
var whereMethod = Expression.Call(
new Func<IQueryable<object>, Expression<Func<object, bool>>, IQueryable<object>>(
Queryable.Where).Method
.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(string)),
Expression.Constant(source),
Expression.Quote(lambda));
var resultExpression = binder.AccessVisitMethodCall(whereMethod);
Assert.IsInstanceOf<MethodCallExpression>(resultExpression);
Assert.AreEqual(whereMethod.Arguments[1], ((MethodCallExpression)resultExpression).Arguments[1]);
}
public void WhereMethodIsTranslatable ()
{
var source = new Mock<IQueryable<ISimpleDbItem>>().Object;
var binder = new QueryBinderAccessor();
var lambdaParameter = Expression.Parameter(typeof(ISimpleDbItem));
var lambda = Expression.Lambda(
Expression.Constant(true),
lambdaParameter);
var whereMethod = Expression.Call(
new Func<IQueryable<object>, Expression<Func<object, bool>>, IQueryable<object>>(
Queryable.Where).Method
.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(ISimpleDbItem)),
Expression.Constant(source),
Expression.Quote(lambda));
var resultExpression = binder.AccessVisitMethodCall(whereMethod);
Assert.IsNotNull(resultExpression);
Assert.IsInstanceOf<QueryExpression>(resultExpression);
Assert.IsNull(((QueryExpression)resultExpression).Select);
Assert.IsNull(((QueryExpression)resultExpression).Limit);
Assert.IsEmpty(((QueryExpression)resultExpression).OrderBy);
Assert.AreSame(lambda.Body, ((QueryExpression)resultExpression).Where);
}