c# - MongoDB .NET exception: Unsupported filter -


i using .net wrapper mongodb (refer following excerpt packages.config versions):

 <package id="mongocsharpdriver" version="2.4.2" targetframework="net461" />   <package id="mongodb.bson" version="2.4.2" targetframework="net461" />   <package id="mongodb.driver" version="2.4.2" targetframework="net461" />   <package id="mongodb.driver.core" version="2.4.2" targetframework="net461" />

i trying build simple filter obtain items of location's latitude , longitude within limits defined latitudedelta , longitudedelta.

bool filterall = string.isnullorempty(username) || username == "*";  var filter = builders<models.mapquery>.filter.where(p => (filterall || (username == p.creatorusername))                 && math.abs(p.pinlocation.latitude - desiredlatitude) < latitudedelta                 && math.abs(p.pinlocation.longitude - desiredlongitude) < longitudedelta);  var queries = await db.getcollection<models.mapquery>(constants.map_query)                     .find(filter)                     .tolistasync();

when program executes "var queries" line, hit exception saying "abs(({pinlocation.latitude} - 3.209096)) not supported.".

how fix above exception? otherwise, workaround if above problem cannot solved?

maby works?

var filter = builders<models.mapquery>.filter.and(         builders<models.mapquery>.filter.eq(p => p.username, username),         builders<models.mapquery>.filter.lt(p => math.abs(p.pinlocation.latitude - desiredlatitude), latitudedelta),         builders<models.mapquery>.filter.lt(p => math.abs(p.pinlocation.longitude - desiredlongitude), longitudedelta));

i changed code use built in api calls more readability. suggest first check before executing query.


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