c# - Adding handlers for some field values and other extension points -



c# - Adding handlers for some field values and other extension points -

i building application datamodel fixed, people (or me) can extend adding classes inherit base of operations class gets instantiated info in db , serialized in services.

i have 3 problem areas (case 1 2 , 3 in sample code below). case #1 maybe solve interface, doesn't help me case 2 or 3.

i think code sample speak improve attempts explain; idead on how approach each new field type doesn't need manually added bunch of places in code?

public class managerclass { public managerclass() { public managerclass() { } //case #1 public void process(allfields allfields) { foreach (field field in allfields.fields) { //currently need add together extention types seperate cases here manually //...this type of logic appears in several places in code if (field.gettype().name == "extendedfield") { //have extended field in way particular } else { //have base of operations field "normal" way } } } //case #2 //here case adding each case in hand //fieldtype string here because storing type of field in db public void create(string value, string fieldtype) { //currently need add together extention types seperate cases here manually if (fieldtype == "extendedfield") { //create extendedfield } else { //create field } } } } [datacontract] //case #3 [knowntype(typeof(extendedfield))] //currently need add together extention types here manually public class allfields { private list<field> fields; public allfields(){} [datamember] public list<field> fields { { homecoming fields; } set { fields = value; } } } [datacontract] public class field { private string fieldvalue; public field(){} [datamember] public string fieldvalue { { homecoming fieldvalue; } set { fieldvalue = value; } } } [datacontract] public class extendedfield : field { private string someotherattribute; public extendedfield(){} [datamember] public string someotherattribute { { homecoming someotherattribute; } set { someotherattribute = value; } } }

sounds you're trying build miniature extensibility framework. consider extension logic handled fieldhandler:

public class fieldhandler { public virtual field createfield(string value, string fieldtype){...} } // case 2 field field = null; foreach (fieldhandler handler in m_handlers) { if (handler.supportsfieldtype(fieldtype)) { field = handler.createfield (value, fieldtype); continue; } } if (field == null) { // create standard field. field = ...; }

c#

Comments

Post a Comment

Popular posts from this blog

iphone - Dismissing a UIAlertView -

iphone - Dismissing a UIAlertView - i set in app purchase app, , when user taps button, purchase started. basically, tap button, , depending on speed on net connection, waiting 10 seconds until new alert view comes asking if purchase product. user tap button multiple times since nil came up, , multiple purchase alert views come up. additionally, maybe seen user app bug. in end, problem. i want alert view come spinning wheel says "loading..." when users taps purchase button. problem is, how dismiss when new alert view comes asking user if want purchase product? if ([uialertview alloc] says: @"whatever apple's alert view says") { //dismiss "loading..." alert view here } i uncertainty work, input appreciated. thanks! you need have access alertview. can this. create alertview instance var in app delegate , when want show loading initialize instance var assign property , when want dismiss phone call [alertviewinstance d...
Read more

intellij idea - Update external libraries with intelij and java -

intellij idea - Update external libraries with intelij and java - simple plenty really. i'm using apache jars, i'll create changes jar's every often. these jars listed external libs in intelij (i.e classpath looking install dir of jar's). when create changes intelij doesn't seem know new implementation. have remove jar external library , re-ad it. does know have intelij picks changes automatically ? i've done clean , rebuild project had little effect. you can go preferences -> build, execution, deployment -> build tools -> maven -> importing , check box says import maven projects automatically . in mac, can command + shift + a , come in action reimport , click on reimport maven projects . intellij-idea
Read more

javascript - send data from a new window to previous window in php -

javascript - send data from a new window to previous window in php - i have image in main.php file : <img src="..\images\image.gif" class="cur" onclick="imgwin();"> when click on image below function has called : function imgwin() { imagewin=window.open("../pages/img.php","imagewin","toolbar=no,width=500,height=200,directories=no,menubar=no,scrollbars=yes"); } this function opens img.php in new window img.php file : <html> <head> <title>upload image</title> </head> <body> <form name="imgform" method="get" action="#"> address : <input type="file" name="imgurl" size="50"> description : <input type="text" name="description" size="50"> <input type="submit" value="sumbit...
Read more