private static OkObjectResult CreateResult(object value, HypermediaResponse hypermediaResponse)
{
var resultValue = value;
if (hypermediaResponse != null)
{
resultValue = new HypermediaResponse(value)
{
Links = hypermediaResponse.Links
};
}
return(new OkObjectResult(resultValue));
}
private static async Task <ObjectResult> ApplyODataAsync <T>(ActionContext context, IQueryable rawData, HypermediaResponse hypermediaResponse)
{
var data = (IQueryable <T>)rawData;
var properties = new Lazy <PropertyInfo[]>(() => typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance));
var query = context.HttpContext.Request.Query;
bool hasSelect = false;
if (query.HasParam("$filter", out var filterValue))
{
data = ODataFilterOperator.Apply(data, properties.Value, filterValue);
}
if (query.HasParam("$orderby", out var orderByValue))
{
data = ODataOrderByOperator.Apply(data, properties.Value, orderByValue);
}
IQueryable <object> projected;
if (query.HasParam("$select", out var selectValue) && !selectValue.Equals("*"))
{
projected = ODataSelectOperator.Apply(data, properties.Value, selectValue);
hasSelect = true;
}
else
{
projected = data.Cast <object>();
}
if (query.HasIntParam("$skip", out int skip))
{
projected = projected.Skip(skip);
}
if (query.HasIntParam("$top", out int top))
{
projected = projected.Take(top);
}
bool isAsync = projected.Provider is IAsyncQueryProvider;
var result = query.ContainsKey("$count")
? CreateResult(isAsync ? await projected.CountAsync() : projected.Count(), hypermediaResponse)
: CreateResult(isAsync ? await projected.ToListAsync() : projected.ToList(), hypermediaResponse);
if (hasSelect)
{
result.Formatters.Add(SelectFormatter);
}
return(result);
}
