c# - Multiple Request Parallel and Observable collection -

-

how add task observablecollection? anytime loops replaces items in collection. want loop , store 4 items i.e. 8 items in total. loop again , add 4 items instead of replacing first items. supposed return photos if effort because of implicit conversion conflict between int , observable collection. ps. still maintain multiple request in parallel 

private async task<int> processurl(string url, httpclient client)     {         httpresponsemessage response = await client.getasync(url);         var responsecontent = await response.content.readasstringasync();         htmldocument htmldocument = new htmldocument();         htmldocument.loadhtml(responsecontent);         observablecollection<photo> photo = new observablecollection<movie>();         foreach (var div in htmldocument.documentnode.descendants().where(i => i.name == "div" && i.getattributevalue("class", "").startswith("ml-item")))         {              string image = div.descendants().where(i => i.name == "img").firstordefault().getattributevalue("data-original", "");              photo.add(new photo() { image = image });            }         return something;     }

as far understood question problem(assumed example) obesrvablecollection created each time call process url. able store photos parallel requests need move obesrvablecollection out of method , make private field or property. avoid sync issues accessing collection parallel requests need use concurrent observablecollection - example of can find @ following topic: concurrent observable collection, dictionary, , sorted dictionary

just remove observablecollection<photo> photo = new observablecollection<movie>(); method , add parsed photos class-scope property or field concurrentobservablecollection type.

so first need download sources article , concurrentobservablecollection class there , add project. change type: observablecollection concurrentobservablecollection. inside processurl remove observablecollection photo = new observablecollection(); , in end change photo.add(new photo() { image = image }); _photo.add(new photo() { image = image }); - using property. not forget clean collection if try use collection once more after parrallel requests finished.


Comments

Post a Comment

Popular posts from this blog

java - nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet Hibernate+SpringMVC -

-
i trying fetch records database , having above error this classs appropriate getters , setters public class user { private int id; private string username; private string password; private string email; i have create database , inserted data below configuration <bean id="datasource" class="org.apache.commons.dbcp2.basicdatasource" destroy-method="close"> <property name="driverclassname" value="com.mysql.jdbc.driver"/> <property name="url" value="jdbc:mysql://localhost:3306/usersdb"/> <property name="username" value="root"/> <property name="password" value=""/> </bean> this complete stacktrace severe: servlet.service() servlet [appservlet] in context path [/spring] threw exception [request processing failed; nested exception org.hibernate.exception.sqlgrammarexception: not ...
Read more

sql - Postgresql tables exists, but getting "relation does not exist" when querying -

-
Image
i have postgresql db number of tables. if query: select column_name information_schema.columns table_name="my_table"; i list of columns returned properly. however, when query: select * "my_table"; i error: (programmingerror) relation "my_table" not exist 'select *\n "my_table"\n' {} any thoughts on why can columns, can't query table? goal able query table. you have include schema if isnt public one select * <schema>."my_table" or can change default schema show search_path; set search_path my_schema; check table schema here select * information_schema.columns for example if table on default schema public both works ok select * parroquias_region select * public.parroquias_region but sectors need specify schema select * map_update.sectores_point
Read more

asp.net mvc - breakpoint on javascript in CSHTML? -

-
i have .cshtml file has javascript tag. within script tag have few lines of javascript. first line of javascript refers property in @viewbag. other javascript lines plain script without mvc related references. observation: can place breakpoints (visual studio 2015) on each of these javascript lines. however, breakpoints has white dot in center of breakpoint symbol (red circle) except line @viewbag reference (this particular line not have white dot in center). it seems breakpoint without white dot hit during run-time. question: can explain going on here? white dot mean? why plain red breakpoint line line hitting breakpoint? the visual studio debugger expecting debug actual server-side code within .cshtml file opposed client-side javascript within it. iirc, visual studio allow debug javascript code expected in internet explorer (and possibly edge), other browsers want use either third-party tool or developer tools (f12) within browser. an easy approach take advant...
Read more