public void Throws_for_no_parameterless_constructor()
{
using (var directory = new TempDirectory())
{
var targetDir = directory.Path;
var source = new BuildSource
{
TargetDir = targetDir,
References =
{
BuildReference.ByName("System.Diagnostics.DiagnosticSource", copyLocal: true),
BuildReference.ByName("System.Interactive.Async", copyLocal: true),
BuildReference.ByName("System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"),
BuildReference.ByName("Microsoft.AspNetCore.Hosting.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore.Tools", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore.Design.Core", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore.Relational", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore.Relational.Design", copyLocal: true),
BuildReference.ByName("Microsoft.EntityFrameworkCore.SqlServer", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Caching.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Caching.Memory", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Configuration.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.DependencyInjection", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.DependencyInjection.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.FileProviders.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Logging", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Logging.Abstractions", copyLocal: true),
BuildReference.ByName("Microsoft.Extensions.Options", copyLocal: true),
BuildReference.ByName("Remotion.Linq", copyLocal: true)
},
Sources = { @"
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;
namespace MyProject
{
internal class MyContext : DbContext
{
public MyContext(DbContextOptions<MyContext> options) :base(options) {}
}
}" }
};
var build = source.Build();
using (var executor = new AppDomainOperationExecutor(targetDir, build.TargetName, targetDir, targetDir, "MyProject"))
{
var ex = Assert.Throws <OperationException>(
() => executor.GetMigrations("MyContext"));
Assert.Equal(
DesignCoreStrings.NoParameterlessConstructor("MyContext"),
ex.Message);
}
}
}
private IDictionary <Type, Func <DbContext> > FindContextTypes()
{
_logger.Value.LogDebug(DesignCoreStrings.LogFindingContexts);
var contexts = new Dictionary <Type, Func <DbContext> >();
// Look for IDbContextFactory implementations
var contextFactories = _startupAssembly.GetConstructableTypes()
.Where(t => typeof(IDbContextFactory <DbContext>).GetTypeInfo().IsAssignableFrom(t));
foreach (var factory in contextFactories)
{
var manufacturedContexts =
from i in factory.ImplementedInterfaces
where i.GetTypeInfo().IsGenericType &&
i.GetGenericTypeDefinition() == typeof(IDbContextFactory <>)
select i.GenericTypeArguments[0];
foreach (var context in manufacturedContexts)
{
contexts.Add(
context,
() => ((IDbContextFactory <DbContext>)Activator.CreateInstance(factory.AsType())).Create(
CreateFactoryOptions()));
}
}
// Look for DbContext classes registered in the service provider
var registeredContexts = _runtimeServices.GetServices <DbContextOptions>()
.Select(o => o.ContextType);
foreach (var context in registeredContexts.Where(c => !contexts.ContainsKey(c)))
{
contexts.Add(
context,
FindContextFactory(context) ?? (() => (DbContext)_runtimeServices.GetRequiredService(context)));
}
// Look for DbContext classes in assemblies
var types = _startupAssembly.GetConstructableTypes()
.Concat(_assembly.GetConstructableTypes())
.Select(i => i.AsType())
.ToList();
var contextTypes = types.Where(t => typeof(DbContext).IsAssignableFrom(t))
.Concat(
types.Where(t => typeof(Migration).IsAssignableFrom(t))
.Select(t => t.GetTypeInfo().GetCustomAttribute <DbContextAttribute>()?.ContextType)
.Where(t => t != null))
.Distinct();
foreach (var context in contextTypes.Where(c => !contexts.ContainsKey(c)))
{
contexts.Add(
context,
FindContextFactory(context) ?? (Func <DbContext>)(() =>
{
try
{
return((DbContext)Activator.CreateInstance(context));
}
catch (MissingMethodException ex)
{
throw new OperationException(DesignCoreStrings.NoParameterlessConstructor(context.Name), ex);
}
}));
}
return(contexts);
}
