public void Finish()
{
if (!Finished)
{
_assignmentExpression = _expressionBuilder.BuildExpression(_tokens);
Finished = true;
}
}
public static IQueryable<TSource> Build<TDbContext,TSource>(this TDbContext dbContext, IExpressionBuilder<TSource> builder) where TDbContext : DbContext where TSource : class
{
var dbContextExpression = Expression.Constant(dbContext,typeof(TDbContext));
var sources = builder.GetParameterTypes()
.Skip(1)
.Where(t=>typeof(IQueryable).IsAssignableFrom(t))
.Select(t=>t.GetGenericArguments().First())
.Select(t=>Expression.Call(dbContextExpression,nameof(dbContext.Set),new[]{t},new Expression[0]));
var expr = builder.BuildExpression(sources);
return dbContext.Set<TSource>().Where(expr);
}
public static IQueryable <T> Where <T>(this IQueryable <T> source, IExpressionBuilder <T> builder, params IQueryable[] sources) where T : class
{
return(source.Where(builder.BuildExpression(sources)));
}