readonly

When trying to change it,throw an exception. I suppose a solution, for class properties, would be to : not define a property with the name that interests you use the magic __get method to access that property, using the "fake" name define the __set method so it throws an exception when trying to set that property. See Overloading , for more informations on magic methods. For variables, I don't think it's possible to have a read-only variable for which PHP will throw an exception when you're trying to write to it. For instance, consider this little class : class MyClass { protected $_data =

Possible Duplicate: Can Read-Only Properties be Implemented in Pure JavaScript? I have an Object that I only want to be defined when constructed. How can I prevent the Object reference from being changed? spender Realistically... by not overwriting it. You could always control access by wrapping it in an object that only offers GetObj with no SetObj, but of course, the wrapper is equally liable to overwriting, as are its "private" member properties that would be "hidden" via the GetObj method. Actually, question is a dupe: Can Read-Only Properties be Implemented in Pure JavaScript? EDIT: After

I have found that People claim that using all readonly fields in a class does not necessarily make that class's instance immutable because there are "ways" to change the readonly field values even after initialization (construction). How? What ways? So my question is when can we really have a "real" immutable object in C#, that I can safely use in threading? Also do anonymous types create immutable objects? And some say LINQ uses immutable objecst internally. How exactly? Eric Lippert You've asked like five questions in there. I'll answer the first one: Having all readonly fields in a class

I have an ASP.NET TextBox and I want it to be ReadOnly . (The user modify it using another control) But when there is a PostBack() , The text get reset to an empty string. I understand that if you set the ReadOnly property to True of a TextBox it's content does not get saved through PostBack() . Is there a way to keep the content after PostBack() and make the TextBox not editable by the user? I tried to set the Enabled property to False ,But still the content doesn't save after PostBack() . Youssef Another solution I found and easier one: Add this to the Page Load method: protected void Page

I've faced with situation when I need to have EF readonly property in case of 'optimistic update'(you do not load current state of your domain object from database to check what properties are really changed. You just set your object as Modified and update it to database. You avoid redundant select and merge operations in this case). You can't write something like this : DataContext.Entry(entity).Property(propertyName).IsModified = false; , because setting of 'false' value is not supported and you will get an exception. (in EF 4.1) I've created a simple structure for registering readonly

I am developing some private projects on Github, and I would like to add nightly cronjobs to my deployments servers to pull the latest version from github. I am currently doing this by generating keypairs on every deployment server and adding the public key to the github project as 'Deployment key'. However, I recently found out that these deployment keys actually do have write access to the project. Hence, every of the server administrators could potentially start editing. Furthermore I can add every deployment key to only one repository, whereas I would like to be able to deploy multiple

I have a field in my Xpage that I want to be readOnly and submitted to the database upon Save. This field gets a value from a Ajax call Setting the property ReadOnly to true creates a <span> instead of a readonly field. Setting the property " Show disabled control for readonly " creates a input text field with the property readonly=readonly. <input type="text" class="xspInputFieldEditBox" readonly="readonly" name="view:_id1:_id2:_id3:_id28:callbackFieldControlSet:InstrumentShort" id="view:_id1:_id2:_id3:_id28:callbackFieldControlSet:InstrumentShort"> It will not be saved to the database.