private MethodCallExpression CreateWhereCall <T>(int id, Type navigationProperyType) where T : class, IEntity
{
ParameterExpression pe = Expression.Parameter(navigationProperyType, "nav");
var foreigKeys = context.Model.GetEntityType(navigationProperyType).GetForeignKeys();
var thePrincipalEntityKey = foreigKeys.Single(fk => fk.PrincipalEntityType.ClrType == typeof(T));
var thePrincipalEntityKeyName = thePrincipalEntityKey.Properties[0].Name;
Expression left = Expression.PropertyOrField(pe, thePrincipalEntityKeyName);
Expression right = Expression.Constant(id, typeof(int?));
Expression e1 = Expression.Equal(left, right);
var constructorinfo = typeof(EntityQueryable <>).MakeGenericType(navigationProperyType).GetConstructors()[0];
var newstsy = constructorinfo.Invoke(new[] { context.GetService <IEntityQueryProvider>() });
Type func11 = typeof(EntityQueryable <>);
Type generic23233 = func11.MakeGenericType(navigationProperyType);
var nwtwDynamically = Expression.Constant(newstsy, generic23233);
Type func1111 = typeof(IQueryable <>);
Type generic2323311 = func1111.MakeGenericType(navigationProperyType);
Type func11111 = typeof(Func <,>);
Type generic232331123 = func11111.MakeGenericType(navigationProperyType, typeof(bool));
Type funxs = typeof(Expression <>);
Type skljslk = funxs.MakeGenericType(generic232331123);
var m1 = GetGenericMethod(typeof(Queryable), "Where", new[] { navigationProperyType }, generic2323311, skljslk);
MethodCallExpression whereCallExpression = Expression.Call(
m1,
nwtwDynamically, //nwtw
Expression.Lambda(e1, new ParameterExpression[] { pe }));
return(whereCallExpression);
}
private MethodCallExpression CreateWhereCall <T>(int id, Type navigationProperyType) where T : class, IEntity
{
ParameterExpression pe = Expression.Parameter(navigationProperyType, "nav");
var foreigKeys = _context.Model.GetEntityType(navigationProperyType).GetForeignKeys();
var thePrincipalEntityKey = foreigKeys.Single(fk => fk.PrincipalEntityType.ClrType == typeof(T));
var thePrincipalEntityKeyName = thePrincipalEntityKey.Properties[0].Name; // TODO: Is it safe to asume first property?
Expression left = Expression.PropertyOrField(pe, thePrincipalEntityKeyName);
Expression right = Expression.Constant(id, typeof(int?));
Expression e1 = Expression.Equal(left, right);
// TODO: Is it safe to asume first constructor?
var constructorinfo = typeof(EntityQueryable <>).MakeGenericType(navigationProperyType).GetConstructors()[0];
var entityProviderConstructor = constructorinfo.Invoke(new[] { _context.GetService <IEntityQueryProvider>() });
Type entityQuerableType = typeof(EntityQueryable <>);
Type entityQuerableOfNavigationPropertyType = entityQuerableType.MakeGenericType(navigationProperyType);
var nwtwDynamically = Expression.Constant(entityProviderConstructor, entityQuerableOfNavigationPropertyType);
Type iQuerableType = typeof(IQueryable <>);
Type iQuerableOfNavigationPropertyType = iQuerableType.MakeGenericType(navigationProperyType);
Type func = typeof(Func <,>);
Type predicateFunc = func.MakeGenericType(navigationProperyType, typeof(bool));
Type expr = typeof(Expression <>);
Type expressionPredicate = expr.MakeGenericType(predicateFunc);
var whereMethod = GetGenericMethod(typeof(Queryable), "Where",
new[] { navigationProperyType },
iQuerableOfNavigationPropertyType,
expressionPredicate);
MethodCallExpression whereCallExpression = Expression.Call(
whereMethod,
nwtwDynamically, //nwtw
Expression.Lambda(e1, new ParameterExpression[] { pe }));
return(whereCallExpression);
}
