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Unable to cast object of type 'System.DBNull' to type 'System.String`
... edited Jun 22 '14 at 9:52
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answered May 15 '09 at 20:25
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How do I restart a WPF application? [duplicate]
...lePath);
Application.Exit();
In my program I have a mutex to ensure only one instance of the application running on a computer. This was causing the newly started application to not start because the mutex had not been release in a timely fashion. As a result I put a value into Properties.Settings...
Fragments onResume from back stack
...e 1 activity (MyActivity) and few fragments that replaces each other (only one is visible at a time).
In MyActivity, add this listener:
getSupportFragmentManager().addOnBackStackChangedListener(getListener());
(As you can see I'm using the compatibility package).
getListener implementation:
pr...
What is the easiest way to make a C++ program crash?
...se but I don't actually know the best and shortest way to do that, does anyone know what to put between my:
30 Answers
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How do I implement onchange of with jQuery?
...red a onchange on a hidden input is: <input type='text' style='display:none' /> (with css)..
– NickGreen
Aug 11 '11 at 7:19
307
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How do I update/upsert a document in Mongoose?
...
Mongoose now supports this natively with findOneAndUpdate (calls MongoDB findAndModify).
The upsert = true option creates the object if it doesn't exist. defaults to false.
var query = {'username': req.user.username};
req.newData.username = req.user.username;
MyMode...
Are Roslyn SyntaxNodes reused?
...fected by the edit.
Now when you try to put all five of those things into one data structure you immediately run into problems:
How do you build a node in the first place? The parent and the child both refer to each other, and are immutable, so which one gets built first?
Supposing you manage to ...
Compiling/Executing a C# Source File in Command Prompt
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/t:exe /out:MyApplication.exe MyApplication.cs ...
(all on one line)
If you have more than one source module to be compiled, you can put it on that same command line. If you have other assemblies to reference, use /r:AssemblyName.dll .
Ensure you have a static Main() method defin...
How to convert an ArrayList containing Integers to primitive int array?
... (identity function), unboxing the int value hold by each Integer object (done automatically since Java 5)
getting the array of int by calling toArray
You could also explicitly call intValue via a method reference, i.e:
int[] arr = list.stream().mapToInt(Integer::intValue).toArray();
It's also ...
#ifdef #ifndef in Java
... }
}
}
javap -c Test gives the following output, indicating that only one of the two paths was compiled in (and the if statement wasn't):
public static void main(java.lang.String[]);
Code:
0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3; //St...