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  • Can we instantiate abstract class?

    - by satheesh.droid
    I don't understand whether we can instantiate abstract class by any means because I have read we can inherit the abstract class but in have found we can create an object by calling method of other class.For example LocationProvider is an abstract class but we can create object for the same by calling getProvider() function in LocationManager class. By the following code LocationManager lm=getSystemService(Context.LOCATION_PROVIDER) LocationProvider lp=lm.getProvider("gps");

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  • How do I specify attributes for a Html.TextBox helper while maintaing the value retreival from ViewD

    - by BigJoe714
    I am using the Html.TextBox helper to create textboxes. I want to set attributes on the textbox, which I understand is done using the following overload: Html.TextBox (string name, object value, object htmlAttributes) However, I want to maintain the functionality where the html helper automatically uses the value from either ViewData or ViewData.Model and I do not see a way to just specify the name and the htmlAttributes. Is this possible?

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  • Cannot use ternary operator in LINQ query

    - by Nissan Fan
    I can't figure out why I get a Object reference not set to an instance of an object. error if I use a ternary operator in my LINQ query. var courses = from d in somesource orderby d.SourceName, d.SourceType select new { ID = d.InternalCode, Name = string.Format("{0} - {1}{2}", d.InternalCode, d.SourceName, (d.SourceType.Length > 0 ? ", " + d.SourceType : string.Empty)) }; Any thoughts?

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  • Usability of an endless/infinite scroll

    - by Anton Gogolev
    What are pros and cons of this technique (see Softfolio for an example). Two things I personally thought of are as follows: Impossible to tell someone where an item of interest is located (like, you probably won't say "324-th row, second column") Broken navigation when you return back to an infinitely scrolled page. What else can you think of? And what do you personally think of this approach in general. Would you use this in you projects?

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  • Is there any sql interpreter for objects?

    - by Behrooz
    Is there any interpreter that takes a string or even a custom object as input and execute it on my datasource? I cannot use linq to object because query always changes and the report i'm working on, has about 6000 queries which i can reduce to 9 if i find some tool doing that for me. Opensource is very applicable. thanks in advance.

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  • .htaccess & mod_rewrite for passing GET parameters

    - by Joel Alejandro
    Currently I use this to pass GET parameters on an "elegant" way: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^([^/]*)/$ index.php?module=$1 [L] RewriteRule ^([^/]*)/([^/]*)/$ index.php?module=$1&object=$2 [L] RewriteRule ^([^/]*)/([^/]*)/([^/]*)/$ index.php?module=$1&object=$2&submodule=$3 [L] This works great for 3 parameters max., (and I'm sure it's seriously ugly). Any way to do the same thing, for n-paremeters?

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  • Unique text field in MySQL and php

    - by Jonathan
    I've created a salt using; md5(rand(0,10000000)); (there is probably a better way?) There doesn't seem to be possible to make a text field unique in MYSQL. So how do I check if the salt has already been used for a previous user? Or should I generate the salt based on the current date/time? as it is impossible for 2 users to register at exactly the same time correct?

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  • Argotic Syndication framework

    - by nav
    Is it me or is the documentation for the argotic framework API impossible to find..? The source is available so surely the documented API should be .. Anybody know where this is? Thanks alot,

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  • Why doesn't HashTable.Contains() just simply return false if it is passed a null?

    - by Nate Pinchot
    I understand why passing a null to HashTable.Contains() doesn't work, but I don't understand what the point of it throwing an ArgumentNullException is - instead of just simply returning false? What is the benefit of throwing the exception (other than to make me do null checks before calling .Contains())? Caused By [System.ArgumentNullException] Key cannot be null. Parameter name: key at System.Collections.Hashtable.ContainsKey(Object key) at System.Collections.Hashtable.Contains(Object key)

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  • Does a syntax for this exist? In any language?

    - by Michael
    It seems pretty common to me to have an argument, in a dynamically typed language that is either an Object or a key to lookup that object. For instance when I'm working with a database I might have a method getMyRelatedStuff(person) All I really need to lookup the related stuff is the id of the person so my method could look like this in python: def getMyRelatedStuff(person_or_id): id = person_or_id.id if isinstance(person,User) else person_or_id #do some lookup Or going the other direction: def someFileStuff(file_or_name): file = file_or_name if hasattr(file,'write') else open(file_or_name)

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  • C# - Does foreach() iterate by reference?

    - by sharkin
    Consider this: List<MyClass> obj_list = get_the_list(); foreach( MyClass obj in obj_list ) { obj.property = 42; } Is 'obj' a reference to the corresponding object within the list so that when I change the property the change will persist in the object instance once constructed somewhere?

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  • Reflection: different ways to retrieve property value

    - by jules
    I'm retrieving an IEnumerable list of properties via following code: BindingFlags bindingFlag = BindingFlags.Instance | BindingFlags.Public; var dataProperties = typeof(myParentObject).GetProperties(bindingFlag); Then I'm iterating through the list and retrieving the value for each property. I've come across two different approaches to doing this, and just wondered what the difference is between them: 1) object propertyValue = property.GetGetMethod().Invoke(myObject, null); 2) object propertValue = property.GetValue(myObject, null)

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  • Javawebparts Ajaxparts: Using same Axis event multiple times in signle form.

    - by Bloodboiler
    I'm using Javawebparts Ajaxparts and would like to use one axis event multiple times in a form. Problem is that std:InnerHTML responseHandler takes its target html tag id in axis-config.xml so it seems impossible to reuse the definition when only thing that should change is the target tag id. Is there a way to set responseHandler parameters on the the page where it is used (in asix:event tag or someting)?

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  • how to find out which textbox is currenlty selected.

    - by abcdefghijklmnopqrstuvwxyz
    I have 3 text-boxes, how do I find out which text-box is currently selected (has focus). I am unable to come up with anything. Public Class Form1 Public activeTextBox As TextBox = CType(Me.ActiveControl, TextBox) Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click activeTextBox.Text = activeTextBox.Text & "This is text 1" End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click activeTextBox.Text = activeTextBox.Text & "This is the text 2" End Sub End Class

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  • Delete document with an empty ID

    - by Damien MATHIEU
    Hello, I have a CouchDB database in production. One of the documents has been edited (in Futon by an other developer). And it's lost it's ID (don't ask me how he did it). So now the document's id is an empty string, which makes it impossible to edit or delete via Futon. Is there a way I could hack into CouchDB to delete that document anyway ?

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