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Showing content from https://graphql-dotnet.github.io/docs/migrations/migration2 below:

Migrating from v0.17.x to v2

• This documentation!
• Subscriptions - details
• DataLoader - helps solve N+1 requests - details
• New SchemaBuilder that supports GraphQL schema language. details
• Unique Directive Per Location Validation Rule - details
• Apollo Tracing - details
• Parser support for the null keyword
• Addition of IDependencyResolver for dependency injection - details
• Add ThrowOnUnhandledException to ExecutionOptions. details
• Add the ability to return a GraphQLTypeReference from ResolveType details
• General updates to conform to the June 2018 Specification - details

The func that was previously used for dependency injection has been replaced by the IDependencyResolver interface. Use FuncDependencyResolver to help integrate with containers. See the Dependency Injection documentation for more details.

[Obsolete]
public Schema(Func<Type, IGraphType> resolveType)
    : this(new FuncDependencyResolver(resolveType))
{
}

public Schema(IDependencyResolver dependencyResolver)
{
  ...
}

The JsonSerializerSettings now use all default values. This was altered to support the changes to dates.

The DateGraphType has been split into multiple types. See the GitHub issue for more details.

• DateGraphType - A date with no time.
  • Scalar Name: Date
  • Format: 2018-05-17 (ISO8601 compliant).
  • Maps to .NET type - System.DateTime
  • Added to GraphTypeRegistry as the default representation of System.DateTime.
• DateTimeGraphType - A date and time.
  • Scalar Name: DateTime
  • Format: 2018-05-17T12:11:06.3684072Z (ISO8601 compliant).
  • Maps to .NET type - System.DateTime
• DateTimeOffsetGraphType - A date and time with an offset.
  • Scalar Name: DateTimeOffset
  • Format: : 2018-05-17T13:11:06.368408+01:00 (ISO8601 compliant).
  • Maps to .NET type System.DateTimeOffset
  • Added to GraphTypeRegistry as the default representation of System.DateTimeOffset.
• TimeSpanSecondsGraphType - A period of time as seconds.
  • Scalar Name: Seconds
  • Format: 10
  • Maps to .NET type - System.TimeSpan
  • Added to GraphTypeRegistry as the default representation of System.TimeSpan.
• TimeSpanMillisecondsGraphType - A period of time as milliseconds.
  • Scalar Name: Milliseconds
  • Format: 100
  • Maps to .NET type - System.TimeSpan

Fields, enumerations, and arguments all now have their names validated according to the GraphQL spec, which is /[_A-Za-z][_0-9A-Za-z]*/.

QueryArgument names are now run through the IFieldNameConverter set on the Schema.

SchemaPrinter now only ignores core GraphQL scalars by default. Those are String, Boolean, Int, Float, and ID. See the GitHub issue for more details.

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