readonly

问题 I have an app that design personalized tags that, when it is detected by an android phone, launches another app with some content. It all works fine and I know how to make a read only nfc Tag. The problem is, I would like to make a NFC Tag only readable by users of the other app. But I also want , if necessary, modify these tags in order to be rewritten. But I want to prevent from users to do themselves. that's why a ndef.makeReadOnly() is not appropriate for me.. does anyone can help me ???

问题 I have a disabled element which I enable it only after value was entered to it's previous input, the problem is that change triggers before the input lost focus and the focus moved to the next not disabled element, so removing the disabled attribute then is no good. HTML: Fill this before you continue: <input id="a" /> Fill this after the previous input: <input id="b" disabled="disabled" />​ jQuery: $('#a').change(function(){ if (this.value === "") $('#b').attr('disabled', 'disabled'); else $

问题 The orderedDictionary instantiation is this: IOrderedDictionary orderedDictionary= gridview.DataKeys[index].Values; orderedDictionary is read only. How can I make a deep copy of orderedDictionary that is not read only? Serialization/deserialization doesn't work cause it also copies the read only part. 回答1: The easiest way would be to just copy the objects: var newDictionary = new OrderedDictionary(); foreach(DictionaryEntry de in orderedDictionary) { newDictionary.Add(de.Key, de.Value); }

问题 I have a MSAccess database that I'm trying to pull archived data into, from other MSAccess databases that live in read-only folders. So ... Dim aidbx As DAO.Database Dim stDB as STring stDB = 'path to read-only database ... Set aidbx = OpenDatabase(stDB, False, True) So it craters right there, even though the 'True' is telling it to open the database read-only. I get the 'Run time error 3050 - could not lock file' error message. What am I doing wrong? 回答1: You already know how to set ADODB

问题 I have some read-only variables set with Set-Variable myVar -Value 10 -Option ReadOnly syntax but I need read-only arrays too. How do I make read-only arrays? Thanks 回答1: PetSerAl, as countless times before, has provided the solution in a terse comment on the question; he's also helped to improve this answer: Use [Array]::AsReadOnly($someArray) , available in PSv3+ [1] : # Create a 2-element read-only collection containing strings. $readOnlyColl = [Array]::AsReadOnly(('one', 'two')) # Try to

问题 In MySQL workbench (Mac OS), I wanted to join two tables so that I can update the second one. The code I put in was as follows select f.company, f.remarks, c.pic from feedback f, customers c where f.col = c.col order by f.company; The output is a read only table, which prevented me from updating table "customers" based on the f.remarks column. Your advice/suggestion is appreciated. Thank you. 回答1: By hovering above the "Read Only" icon, I got the following message: "Statement must be a SELECT

问题 I have one TextBox. I want to make textbox readonly property true or false during an event. I set the TextBox readonly property as true by the following code: txtNoOff.Attributes.Add("readonly", "readonly"); But how to make textbox readonly property false? I have tried like below: txtNoOff.Attributes.Add("readonly", "false"); But it does not work. How to achieve this? I need all ur suggestions please. 回答1: Just remove the readonly attribute: txtNoOff.Attributes.Remove("readonly"); 回答2: please

问题 XCode accepts it. But will retain be applied when I internally set the property (no setter outside since readonly but when I initialize the value in a class method) ? Regards, Apple92 回答1: The reason to do this is to allow you to do @property (retain) in a class continuation or category. If you don't have the retain on the outer property, you will get a warning about the properties being mismatched. 回答2: You might specify (readonly, retain) for a publicly-facing property, and then inside your

问题 I'm trying to set LongTimePattern property of CurrentCulture with the following code: System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat.LongTimePattern = "HH:mm:ss"; and I'm getting InvalidOperationException: Instance is read-only. Any idea how can I change it? I want to force LongTimePattern to show 24h format for any culture. 回答1: If you change the System.Threading.Thread.CurrentThread.CurrentCulture then it will automatically update the LongTimePattern. You can't make any

问题 Consider the following code: public ObservableCollection<Message> Messages { get { return new ObservableCollection<Message>(); } } Is there anything I can do to prevent the caller code from adding/removing/changing items? EDIT: Sorry, everyone, I just noticed it's a dupe, but the accepted answer is wrong. 回答1: What about using ReadOnlyObservableCollection Code would be: public ReadOnlyObservableCollection<Message> Messages { get { return new ReadOnlyObservableCollection<Message>(new