ErrLookup › dotnet/efcore
dotnet/efcore
EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. · C# · 2,845 source files
Analyzed at 3a2006ef56 on 2026-08-11. 429 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| The LINQ expression ' ' could not be translated. Additional… | exception | error | efcore, inmemory, query-translation, groupby, client-eval |
| A call was made to ' ' that changed an option that must be… | exception | critical | cosmos, di, singleton-options, configuration, service-provider |
| The property ' . ' is mapped to an output parameter of the… | exception | error | ef-core, stored-procedures, model-validation, store-generated |
| Unhandled expression | exception | error | cosmos, linq, query-translation, sql-generation, internal |
| Entity type ' ' is an optional dependent using table… | exception | error | ef-core, owned-types, table-sharing, model-validation, optional-dependent |
| The partition key property | exception | error | ef-core, cosmos, model-validation, partition-key, shared-container |
| Couldn't find single Add method on type | exception | error | precompiled-queries, roslyn, object-creation, collection-initializer, reflection, expression-tree |
| 'FromSql' or 'SqlQuery' was called with non-composable SQL… | exception | error | efcore, fromsql, sql, query-translation |
| The type ' ' used for shared entity type ' ' is not… | exception | error | efcore, proxies, change-tracking, shared-type, indexer, dictionary, model-building |
| LINQ query comprehension syntax is currently not supported… | exception | error | precompiled-queries, roslyn, linq, query-syntax, not-supported, expression-tree |
| The check constraint | exception | error | check-constraints, inheritance, conventions, model-validation |
| The requested configuration is not stored in the… | exception | error | ef-core, cosmos, metadata, runtime-model, vector-search |
| The project language | exception | error | design-time, migrations, code-generation, language, scaffolding |
| The mapped indexer property on entity type | exception | error | efcore, proxies, change-tracking, indexer, model-building, virtual |
| Entity type ' ' has a split mapping for ' ' that is shared… | exception | error | ef-core, model-validation, mapping, table-splitting, owned-types |
| The entity type ' ' is sharing the container ' ' with other… | exception | error | ef-core, cosmos, model-validation, discriminator, shared-container |
| The entity type ' ' is mapped to the container ' ' but it… | exception | error | ef-core, cosmos, model-validation, owned-types, container |
| Unnamed captured variable | exception | error | expression-trees, precompiled-queries, compiled-model, linq |
| 'UseChangeTrackingProxies' and 'UseLazyLoadingProxies' each… | exception | error | efcore, proxies, di, service-provider, configuration |
| Invocation over non-member access | exception | error | precompiled-queries, roslyn, method-invocation, member-access, expression-tree |
| Property ' . ' is not virtual. 'UseChangeTrackingProxies'… | exception | error | efcore, proxies, change-tracking, virtual, navigation, model-building |
| Cannot create a 'SelectExpression' with a custom… | exception | error | efcore, inheritance, fromsql, discriminator, select-expression |
| The partition key properties for entity type | exception | error | ef-core, cosmos, model-validation, partition-key, shared-container |
| The entity type ' ' has a custom constructor binding… | exception | error | compiled-model, constructor-binding, entity-types, scaffolding |
| The value ' ' provided for argument ' ' must be a valid… | validation | error | ef-core, cosmos, validation, enum, vector-search |
| Named default constraints cannot be used with TPC or entity… | exception | error | default-constraints, tpc, entity-splitting, conventions |
| The DbFunction ' ' returns ' ', but ' ' is not a mapped… | exception | error | efcore, relational, dbfunction, model-validation, tvf, entity-mapping |
| Your target project ' ' doesn't match your migrations… | exception | error | migrations, assembly, project-layout, configuration |
| Complex property ' ' cannot use 'HasJsonPropertyName()'… | exception | error | complex-type, json-mapping, configuration-conflict, model-validation |
| ObjectCreation: non-assignment initializer expression of… | exception | error | precompiled-queries, roslyn, object-creation, initializer, csharp-syntax, expression-tree |
| Lambda with null expression body | exception | error | precompiled-queries, roslyn, lambda, statement-lambda, expression-tree, not-supported |
| A synchronous store management operation was performed and… | exception | error | efcore, inmemory, seeding, configuration, sync-async |
| No backing field was found for property | exception | error | compiled-model, backing-field, property-access-mode, unsafe-accessors, scaffolding |
| Unable to translate set operation after client projection… | exception | error | efcore, inmemory, query-translation, set-operations, client-eval |
| Subquery with index projection binding | exception | error | cosmos, query-translation, subquery, not-implemented |
| 'DefaultIfEmpty' cannot be applied after a client-evaluated… | exception | error | efcore, inmemory, query-translation, defaultifempty, left-join |
| The DbFunction ' ' returns a SqlExpression of type ' '… | exception | error | efcore, dbfunction, translation, nullable, model-configuration |
| The discriminator value for | exception | error | ef-core, cosmos, model-validation, discriminator, shared-container |
| The property ' ' on entity type ' ' is not mapped to ' '. | exception | error | model-validation, table-sharing, column-mapping, migrations |
| Complex property ' ' cannot have both a JSON column name ('… | exception | error | complex-type, json-mapping, configuration-conflict, model-validation |
| The partition key value supplied for | exception | error | ef-core, cosmos, partition-key, type-conversion, validation |
| The optional complex property | exception | error | complex-type, optional, table-sharing, discriminator, model-validation |
| An error occurred while reading a database value. The… | exception | error | materialization, null-value, value-type, data-reader |
| The ' ' method is not supported because the query has… | exception | error | ef-core, cosmos, linq-translation, db-functions, client-evaluation |
| A vector index is defined for | exception | error | cosmos, vector-search, model-validation, configuration |
| An Azure Cosmos DB container name is defined on entity type | exception | error | ef-core, cosmos, model-validation, inheritance, container |
| Explicitly named default constraints cannot be used with… | exception | error | default-constraints, tpc, entity-splitting, conventions |
| The property ' ' cannot be configured as… | exception | error | cosmos, model-validation, key, value-generated, configuration |
| Compound assignment of private property not yet supported | exception | error | ef-core, expression-trees, reflection, unsafe-accessor, compound-assignment, properties, code-generation |
| Invocation: Found matches for generic method | exception | error | precompiled-queries, roslyn, reflection, generic-methods, method-resolution, expression-tree |
| Specified argument was out of the range of valid values… | validation | error | ef-core, cosmos, validation, enum, configuration |
| The property ' ' on type ' ' cannot be configured as not… | exception | error | ef-core, cosmos, model-validation, auto-loaded, configuration |
| Unsupported LINQ unary node | exception | error | expression-trees, precompiled-queries, compiled-model, linq, unary-operator |
| The table ' ' cannot be used for entity type ' ' since it… | exception | error | ef-core, table-sharing, migrations, model-validation |
| A DbCommand cannot be created for a non-relational query. | exception | error | non-relational, in-memory-provider, dbcommand, diagnostics |
| Input parameter ' ' of update stored procedure ' ' is… | exception | error | ef-core, stored-procedures, model-validation, savechanges |
| The type ' ' is configured as a shared-type entity type… | exception | error | ef-core, proxies, shared-type-entity, dbset, configuration |
| Unhandled annotatable type | validation | error | ef-core, design-time, annotations, scaffolding, code-generation |
| The results of a split query could not be correlated… | exception | error | split-query, concurrency, transaction-isolation, data-integrity |
| Cosmos-specific methods can only be used when the context… | exception | error | ef-core, cosmos, provider-mismatch, configuration |
| Unary node with non-null method | exception | error | expression-trees, precompiled-queries, compiled-model, linq, unary-operator |
| MemberAccess on multi-dimensional array | exception | error | precompiled-queries, roslyn, array, member-access, not-implemented, expression-tree |
| Property ' ' on entity type ' ' is mapped without a CLR… | exception | error | efcore, proxies, change-tracking, navigation, field-only, model-building |
| The index over properties | exception | error | cosmos, model-validation, indexing, owned-types, configuration |
| The entity type ' ' is owned by the entity type ' ', but is… | exception | error | ef-core, cosmos, model-validation, owned-types, container |
| The exception list configured for Cosmos automatic indexing… | exception | error | cosmos, model-validation, indexing, configuration |
| Creating a container with full-text search or vector… | exception | error | cosmos, vector-search, full-text, owned-collection, container-creation |
| Required properties ' ' are missing for the instance of… | exception | error | efcore, inmemory, validation, required-properties, sensitive-data, savechanges |
| The entity type ' ' does not have a property mapped to the… | exception | error | cosmos, id-property, document-root, conventions, model-configuration |
| Unsupported numeric type mapping | exception | error | cosmos, type-mapping, numeric, internal-api, decimal |
| The entity type ' ' is mapped to the stored procedure ' '… | exception | error | ef-core, stored-procedures, model-validation |
| The IsDiscriminatorMappingComplete setting was configured to | exception | error | cosmos, model-validation, discriminator, tph, configuration |
| The entity type ' ' is sharing the container ' ' with other… | exception | error | ef-core, cosmos, model-validation, discriminator, shared-container |
| None of connection string, CredentialToken, account key or… | exception | critical | cosmos, configuration, connection-string, startup |
| The index on the entity type ' ' cannot be configured… | exception | error | json, complex-types, indexes, model-validation |
| The property ' . ' is mapped to a result column of the… | exception | error | ef-core, stored-procedures, model-validation, store-generated |
| The current migration SQL generator | exception | error | migrations, sql-generation, provider, extensibility |
| The LINQ expression ' ' could not be translated. Either… | exception | error | linq-translation, projection, client-evaluation, parameter-expression |
| When using AutoTransactionBehavior.Always with the Cosmos… | exception | error | cosmos, autotransactionbehavior, triggers, savechanges, atomicity |
| Lambda with modifiers not supported | exception | error | ef-core, query-translation, linq-expressions, csharp, precompiled-queries, roslyn |
| No DbContext was found in assembly | exception | error | migrations, context-discovery, assembly, design-time |
| The name you have chosen for the migration | exception | error | migrations, naming, code-generation, conflict |
| The provider for the source 'IQueryable' doesn't implement… | exception | error | ef-core, cosmos, async, paging, queryable |
| Complex property ' ' is mapped to JSON but its containing… | exception | error | complex-type, nested-complex, json-mapping, model-validation |
| You cannot add a migration with the name 'Migration'. | exception | error | migrations, naming, code-generation, conflict |
| ' . ' and ' . ' are both mapped to column ' ' in ' ', but… | exception | error | model-validation, column-mapping, inheritance, relational |
| Encountered a constant of unsupported type | exception | error | ef-core, expression-trees, constants, code-generation, closures, csharp |
| The following lambda argument to 'SetProperty' does not… | exception | error | efcore, executeupdate, setproperty, lambda, query-translation |
| The table ' ' cannot be used for entity type ' ' since it… | exception | error | ef-core, table-sharing, inheritance, model-validation |
| SHA256 mismatch for : expected , got | exception | error | integrity, network, sha256, deb, mirror |
| Changes have been made to the model since the last… | exception | warning | migrations, model-diff, snapshot, design-time |
| Complex projections in subqueries are currently unsupported. | exception | error | cosmos, query-translation, subquery, projection |
| ObjectCreation: couldn't find initialized member | exception | error | precompiled-queries, roslyn, reflection, object-creation, initializer, member-binding |
| The type ' ' cannot be mapped as a dictionary because it… | exception | error | ef-core, cosmos, change-tracking, dictionary-mapping, type-mismatch |
| The property ' . ' has a value generator configured. Use '… | exception | error | compiled-model, value-generator, entity-types, scaffolding |
| The entity type ' ' cannot be instantiated because its… | exception | error | model-validation, inheritance, tpc, abstract, relational |
| Entity type ' ' has a split mapping for ' ', but the… | exception | error | entity-splitting, model-validation, primary-key, relational |
| ObjectCreation: Missing constructor | exception | error | precompiled-queries, roslyn, reflection, object-creation, constructor, expression-tree |
| The element type of the result of | exception | error | efcore, relational, dbfunction, tvf, inheritance, tph, tpt, tpc, discriminator, model-validation |
| The entity type ' ' is mapped to the stored procedure ' '… | exception | error | ef-core, stored-procedures, model-validation |