c# - Having some trouble creating a UserControl with a parameter -


i use tabcontrol in 1 of classes. however, don't want bloat class , put code in it, xaml tabitems.

after googling i've come usercontrol. created usercontrol every tabitem, c# code of tabitem in usercontrol.

the problem here, need transfer data parent window (the 1 containing tabcontrol) usercontrols, correctly display data needed tab.

i created usercontrol in xaml , code this:

<tabitem name="usertab" header="gebruikers" horizontalalignment="stretch">         <local:usertabcontrol x:name="usertabpanel"/> </tabitem>

this constructor code usercontrol:

public usertabcontrol() {         setusersview(); // need data         setuserdata((user)usersview.selecteditem);         initializecomponent();  }

this class variable in usercontrol needs variable parent window: private static parser m_config;

when run this, compile error saying :

"object reference not set instance of object."

pointing xaml line create usercontrol.

so, conclusion here yet unable pass variable usercontrol , have suggestions or hints or guidance on how in case. going wrong here in achieving required functionality ?

im not sure best way so, me worked well.

for start create customusercontrol class inherit usercontrol constractor parent form attribute this:

public partial class customusercontrol : usercontrol {    mainform parentform;    public customusercontrol(mainform mainform)    {       parentform = mainform;    }    ...     ...    private void dosomthing()    {       parentform.mainformmember = 1;    } }

and in mainform:

public partial class mainform : form {    private int mainformmember{ get; set; }    private customusercontrol customusercontrol;     public mainform()    {         initializecomponent();          // create , add customusercontrol manually , not toolbox         customusercontrol = new customusercontrol(this);         this.controls.add(customusercontrol);    }     ...    ... }

in way can access form components usercontrol


Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more