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Type:
Bug
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Resolution: Duplicate
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Priority:
Unknown
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None
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Affects Version/s: 2.12.2
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Component/s: Linq
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None
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Environment:Windows x64
If I pass common expression to Where clause to IMongoQueryable it returns ArgumentNullException (Value cannot be null. (Parameter 'itemName')).
How to reproduce:
public class TestEntity : Entity { } public static class MongoBugs { [Fact] public static void TestMongoIQueryableBug() { var mongoDb = new MongoClient(new MongoClientSettings { ServerSelectionTimeout = TimeSpan.FromMilliseconds(0) }).GetDatabase("admin"); var expression = CreateGuidFilterExpression(nameof(TestEntity.Id), Guid.Empty); try { mongoDb.GetCollection<TestEntity>(nameof(TestEntity)).AsQueryable().Where(expression).First(); } catch (Exception ex) { ex.Should().BeAssignableTo<ArgumentNullException>(); } } private static Expression<Func<TestEntity, bool>> CreateGuidFilterExpression(string propertyName, Guid value) { // expression input parameter var entityParameter = Expression.Parameter(typeof(TestEntity)); return // parameter.[propertyName] == .Constant(value) expression Expression.Lambda<Func<TestEntity, bool>>( Expression.Equal(Expression.Property(entityParameter, propertyName), Expression.Constant(value)), entityParameter); } }
If I write
var entityParameter = Expression.Parameter(typeof(TestEntity), "entity");
it works.
- duplicates
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CSHARP-2422 Dynamic Linq expression with ParameterExpression would throw value can not be null Exception if ParameterName not set
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- Closed
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