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  • Create class instance in assembly from string name

    - by Arcadian
    I'm not sure if this is possible, and I'm quite new to using assemblies in C#.NET. What I would like to do is to create an instance of a class when supplied the string name of that class. Something like this: using MyAssembly; namespace MyNameSpace { Class MyClass { int MyValue1; int MyValue2; public MyClass(string myTypeName) { foreach(Type type in MyAssembly) { if((string)type == myTypeName) { //create a new instance of the type } } AssignInitialValues(//the type created above) } //Here I use an abstract type which the type above inherits from private void AssignInitialValues(AbstractType myClass) { this.value1 = myClass.value1; this.value2 = myClass.value2; } } } Obviously you cannot compare strings to types but it illustrates what I'm trying to do: create a type from a supplied string. Any thoughts? EDIT: After attempting: var myObject = (AbstractType) Activator.CreateInstance(null, myTypeName); AssignInitialValues(myObject); I get a number of errors: Inconsistent accessibility: parameter type 'MyAssembly.AbstractType' is less accessible than method 'MyNameSpace.MyClass.AssignInitialValues(MyAssembly.AstractType)' 'MyAssembly.AstractType' is inaccessible due to it's protection level The type or namespace name 'MyAssembly' could not be found (are you missing a using directive or an assembly reference?) The type or namespace name 'AbstractType' could not be found (are you missing a using directive or an assembly reference?) Not exactly sure why it can't find the assembly; I've added a reference to the assembly and I use a Using Directive for the namespace in the assembly. As for the protection level, it's calling classes (or rather the constructors of classes) which can only be public. Any clues on where the problem is? UPDATE: After looking through several articles on SO I came across this: http://stackoverflow.com/a/1632609/360627 Making the AbstractTypeclass public solved the issue of inconsistent accessibility. The new compiler error is this: Cannot convert type 'System.Runtime.Remoting.ObjectHandle' to 'MyAssembly.AbstractType' The line it references is this one: var myObject = (AbstractType) Activator.CreateInstance(null, myTypeName); Using .Unwrap() get's me past this error and I think it's the right way to do it (uncertain). However, when running the program I then get a TypeLoadException when this code is called. TypeLoadException: Could not load type ‘AbstractType’ from assembly ‘MyNameSpace'... Right away I can spot that the type its looking for is correct but the assembly it's looking in is wrong. Looking up the Activator.CreateInstance(String, String) method revealed that the null as the first argument means that the method will look in the executing assembly. This is contrary to the required behavior as in the original post. I've tried using MyAssembly as the first argument but this produces the error: 'MyAssembly' is a 'namespace' but is used like a 'variable' Any thoughts on how to fix this?

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  • Subclass not seeing superclass' instance variable

    - by hyn
    I have a situation where my subclass is not seeing the superclass' instance variable x. The ivar is obviously @protected by default, so why do I get a compiler error "x undeclared"? If I make this ivar a property then I can access it by self.x. What's worse is sometimes the error disappears, so something in my code is obviously causing this error but I cannot figure it out.

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  • Error "Create a concrete instance!"

    - by dododedodonl
    Hey All, I've got another problem in the same code... I'm getting this error: *** initialization method -initWithFormat:locale:arguments: cannot be sent to an abstract object of class NSString_RegEx: Create a concrete instance! But I don't understand the error or what I should do...

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  • Google App Engine getting verbose_name of a property from an instance

    - by Brian M. Hunt
    Given a model likeso: from google.appengine.ext import db class X(db.Model): p = db.StringProperty(verbose_name="Like p, but more modern.") How does one access verbose_name from x=X() (an instance of X)? One might expect that x.p.verbose_name would work, or alternatively x.properties()['p'].verbose_name, but neither seems to work. Thanks! EDIT: x.name.verbose_name = x.p.verbose_name

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  • Java, let CookieHandler work on only one instance.

    - by user435657
    Hi all, I don't know how CookieHandler works system wide, I did view the source of CookieHandler but found no more information except the get/set methods. Where do TCP/HTTP connections use instance of CookieHandler, which I set by CookieHandler.setDefault(...) Which source file I should refer to? URLConnection & HttpURLConnection don't seem have things to do with it. Help, thanks in advance.

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  • -[CCScene setOffsetx:]: unrecognized selector sent to instance

    - by Alexander Sharunov
    please help me, i'm very new in objective-c i've got 2 simplest classes (bellow first, second) i would like to set the offsetx properties of self.rolypoly object in second class like a self.rolypoly.offsetx=1 or run use [self.rolypoly setOffx]; to do somethings, but i always have the errors: trying [self.rolypoly setOffx]; in second class -[CCScene setOffx:]: unrecognized selector sent to instance 0x91d0b70' or trying self.rolypoly.offsetx=1; in second class -[CCScene setOffsetx:]: unrecognized selector sent to instance 0x808bfc0' first class //************************************************************ #import <Foundation/Foundation.h> #import "cocos2d.h" @interface RolyPoly : CCLayer { CCAction *_walkAction; CCSprite *_rolypoly; int offsetx; int offsety; } @property (nonatomic, retain) CCSprite *rolypoly; @property (nonatomic, retain) CCAction *walkAction; @property (nonatomic, assign) int offsetx; @property (nonatomic, assign) int offsety; +(id) scene; -(void) setOffx; @end //************************************************************ #import "GameLayer.h" #import "RolyPoly.h" @implementation RolyPoly @synthesize rolypoly = _rolypoly; @synthesize walkAction = _walkAction; @synthesize offsetx = _offsetx; @synthesize offsety = _offsety; +(id) scene { CCScene *scene = [CCScene node]; RolyPoly *layer = [RolyPoly node]; [scene addChild: layer]; return scene; } -(id) init { if ((self = [super init])) { [self scheduleUpdate]; } return self; } -(void) setOffx { NSLog(@"setOffx"); } -(void) update:(ccTime)delta { } - (void) dealloc { self.rolypoly = nil; self.walkAction = nil; [super dealloc]; } @end second class //************************************************************ #import <Foundation/Foundation.h> #import "cocos2d.h" #import "RolyPoly.h" @interface GameLayer : CCLayer { RolyPoly *_rolypoly; } // returns a CCScene that contains the HelloWorldLayer as the only child +(CCScene *) scene; @property (nonatomic, assign) RolyPoly * rolypoly; @end //************************************************************ #import "GameLayer.h" #import "RolyPoly.h" // HelloWorldLayer implementation @implementation GameLayer @synthesize rolypoly = _rolypoly; +(CCScene *) scene { CCScene *scene = [CCScene node]; GameLayer *layer = [GameLayer node]; [scene addChild: layer]; return scene; } -(id) init { if( (self=[super init])) { CGSize screenSize = [[CCDirector sharedDirector] winSize]; self.rolypoly = [RolyPoly scene]; [self addChild:self.rolypoly z:1]; [self.rolypoly setOffx]; [self scheduleUpdate]; } return self; } - (void)update:(ccTime)dt { } - (void) dealloc { [super dealloc]; } @end

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  • Split text at the first instance of a letter

    - by Blankman
    I have a bunch of product sku's that look like: abc234 asdf234324 adc234-b result: abc 234 asdf 234324 adc 234-b I want to split the text at the first instance of a letter. When I say split, basically I want to have access to both parts of the text, maybe in an array? What's the best way to do this?

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  • Adding LambaExpression to an instance of IQueryable

    - by Paul Knopf
    ParameterExpression parameter = Expression.Parameter(typeof(Product), "x"); MemberExpression Left = Expression.MakeMemberAccess(parameter, typeof(Product).GetProperty("Name")); ConstantExpression Right = Expression.Constant(value, typeof(String)); BinaryExpression expression = Expression.Equal(Left, Right); LambdaExpression lambada = Expression.Lambda<Func<Product, bool>>(expression, parameter); Now how do I add this lambada to an instance of an IQuerybale, lets say _query _query.Where(lambada.Compile());?

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  • How do I create a new instance of a different class when saving a model

    - by Will
    I have a Class A that when it is instantiated and saved for the first time or modified it will create an instance of Class B and save it also I want them to be in the same transaction and I want it to be handled in the Model not a controller. I know how to do this in a conteoller with the ‘transaction do’ block but how do I do it in the model? Thanks

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  • Programatically importing a file and creating an instance of a class in Python

    - by benofsky
    I have a (python) list of strings which refer to python source files and subsequently classes within those files which I want to import and then create an instance of the classes within the files (everything follows a strict naming convention, making this theoretically possible), in Ruby I would do something like: require "lib/sources/#{source}.rb" s = source.constantize.new How would I do something similar in Python? Thanks, Ben

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  • Restoring and passing data to an already running instance of a .NET application

    - by mtranda
    The goal is to have an application that runs in the system tray and can either accept user input from its actual GUI (which isn't the actual issue) OR accept command line parameters (that would actually be done via a context menu in windows explorer). Now, while I'm aware that the command line parameters are not exactly possible once the application has started, I need a way to pass data to the already running application instance via some form of handler. I'm thinking maybe define and raise some sort of event? Thanks in advance.

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