protected static ProcessResult CreateResult(ActionContext context, IQueryable query, int?takeCount, IQueryable inlineCountQuery)
{
int?max = context.MaxResultCount ?? context.Service?.MaxResultCount;
if (max > 0)
{
var count = takeCount ?? Queryable.Count((dynamic)query);
if (count > max)
{
throw new Exception($"Maximum allowed read count exceeded");
}
}
var service = context.Service;
if (service == null)
{
return(CreateResult(context, Enumerable.ToList((dynamic)query), inlineCountQuery));
}
var beforeArgs = new BeforeQueryEventArgs(context, query);
service.OnBeforeQueryExecute(beforeArgs);
query = beforeArgs.Query;
var result = Enumerable.ToList((dynamic)query);
var afterArgs = new AfterQueryEventArgs(context, query, result);
service.OnAfterQueryExecute(afterArgs);
result = afterArgs.Result;
return(CreateResult(context, result, inlineCountQuery));
}
void ILinquestService.OnBeforeQueryExecute(BeforeQueryEventArgs args) => BeforeQueryExecute?.Invoke(this, args);
public virtual ProcessResult HandleContent(IQueryable query, ActionContext context)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var service = context.Service;
if (service != null)
{
var args = new BeforeQueryEventArgs(context, query);
service.OnBeforeHandleQuery(args);
query = args.Query;
}
var parameters = context.Parameters;
if (parameters == null || !parameters.Any())
{
return(CreateResult(context, query, null, null));
}
var inlineCountEnabled = false;
int? takeCount = null;
IQueryable inlineCountQuery = null;
foreach (var prm in parameters)
{
switch (prm.Name.ToLowerInvariant())
{
case "$inlinecount":
inlineCountEnabled = prm.Value != "false" || prm.Value == "allpages";
break;
case "$filter":
case "$where":
inlineCountQuery = null;
query = Where(query, prm.Value);
break;
case "$orderby":
query = OrderBy(query, prm.Value);
break;
case "$orderbydescending":
query = OrderbyDescending(query, prm.Value);
break;
case "$thenby":
query = ThenBy(query, prm.Value);
break;
case "$thenbydescending":
query = ThenByDescending(query, prm.Value);
break;
case "$select":
query = Select(query, prm.Value);
break;
case "$skip":
if (inlineCountEnabled && inlineCountQuery == null)
{
inlineCountQuery = query;
}
query = Skip(query, Convert.ToInt32(prm.Value));
break;
case "$top":
case "$take":
if (inlineCountEnabled && inlineCountQuery == null)
{
inlineCountQuery = query;
}
var take = Convert.ToInt32(prm.Value);
query = Take(query, take);
takeCount = take;
break;
case "$groupby":
inlineCountQuery = null;
var keyValue = prm.Value.Split(';');
if (keyValue.Length > 2)
{
throw new Exception("Invalid groupBy expression");
}
var keySelector = keyValue[0];
var valueSelector = keyValue.Length == 2 ? keyValue[1] : null;
query = GroupBy(query, keySelector, valueSelector);
break;
case "$distinct":
inlineCountQuery = null;
query = Distinct(query);
break;
case "$reverse":
query = Reverse(query);
break;
case "$selectmany":
inlineCountQuery = null;
takeCount = null;
query = SelectMany(query, prm.Value);
break;
case "$skipwhile":
inlineCountQuery = null;
query = SkipWhile(query, prm.Value);
break;
case "$takewhile":
inlineCountQuery = null;
query = TakeWhile(query, prm.Value);
break;
case "$aggregate":
var funcSeed = prm.Value.Split(';');
if (funcSeed.Length > 2)
{
throw new Exception("Invalid aggregate expression");
}
var func = funcSeed[0];
var seed = funcSeed.Length == 2 ? funcSeed[1] : null;
return(CreateResult(context, Aggregate(query, func, seed), inlineCountQuery));
case "$all":
return(CreateResult(context, All(query, prm.Value), inlineCountQuery));
case "$any":
return(CreateResult(context, Any(query, prm.Value), inlineCountQuery));
case "$average":
case "$avg":
return(CreateResult(context, Avg(query, prm.Value), inlineCountQuery));
case "$max":
return(CreateResult(context, Max(query, prm.Value), inlineCountQuery));
case "$min":
return(CreateResult(context, Min(query, prm.Value), inlineCountQuery));
case "$sum":
return(CreateResult(context, Sum(query, prm.Value), inlineCountQuery));
case "$count":
return(CreateResult(context, Count(query, prm.Value), inlineCountQuery));
case "$first":
return(CreateResult(context, First(query, prm.Value), inlineCountQuery));
case "$firstordefault":
return(CreateResult(context, FirstOrDefault(query, prm.Value), inlineCountQuery));
case "$single":
return(CreateResult(context, Single(query, prm.Value), inlineCountQuery));
case "$singleordefault":
return(CreateResult(context, SingleOrDefault(query, prm.Value), inlineCountQuery));
case "$last":
return(CreateResult(context, Last(query, prm.Value), inlineCountQuery));
case "$lastordefault":
return(CreateResult(context, LastOrDefault(query, prm.Value), inlineCountQuery));
case "$elementat":
return(CreateResult(context, ElementAt(query, Convert.ToInt32(prm.Value)), inlineCountQuery));
case "$elementatordefault":
return(CreateResult(context, ElementAtOrDefault(query, Convert.ToInt32(prm.Value)), inlineCountQuery));
default:
throw new Exception($"Unknown query parameter {prm.Value}");
}
}
return(CreateResult(context, query, takeCount, inlineCountQuery));
}
void ILinquestService.OnBeforeHandleQuery(BeforeQueryEventArgs args) => BeforeHandleQuery?.Invoke(this, args);
