static-variables

At the moment I am working on a project admin application in C# 3.5 on ASP.net. In order to reduce hits to the database, I'm caching a lot of information using static variables. For example, a list of users is kept in memory in a static class. The class reads in all the information from the database on startup, and will update the database whenever changes are made, but it never needs to read from the datebase. The class pings other webservers (if they exist) with updated information at the same time as a write to the database. The pinging mechanism is a Windows service to which the cache

I was trying to create a static variable to store a dictionary of images. Unfortunately, the best way I could find to initialise it was to check in each function that used the variable. Since I am creating this variable inside a category, I can't just initialise it inside the initialiser. Is there a neater way of initialising navigationBarImages? static NSMutableDictionary *navigationBarImages = NULL; @implementation UINavigationBar(CustomImage) //Overrider to draw a custom image - (void)drawRect:(CGRect)rect { if(navigationBarImages==NULL){ navigationBarImages=[[NSMutableDictionary alloc]

I've got an application that's using a static library I made. One .cpp file in the library has a static variable declaration, whose ctor calls a function on a singleton that does something- e.g. adds a string. Now when I use that library from the application, my singleton doesn't seem to contain any traces of the string that was supposed to be added. I'm definitely missing something but I don't know what.. If you have an object in a static library that is not EXPLICITLY used in the application. Then the linker will not pull that object from the lib into the application. There is a big

I know .OBJ is the result of compiling a unit of compilation and .LIB is a static library that can be created from several .OBJ, but this difference seems to be only in the number of units of compilation. Is there any other difference? Is it the same or different file format? I have come to this question when wondering if the same static variable defined in two (or more) .LIBs is merged or not during linking into the final executable. For .OBJs the variables are merged. But is it the same in .LIBs? A .LIB file is a collection of .OBJ files concatenated together with an index. There should be

I want to have the same static variable with a different value depending on the type of class. So I would have public class Entity { public static Bitmap sprite; public void draw(Canvas canvas, int x, int y) { canvas.drawBitmap(sprite, x, y, null); } } public class Marine extends Entity { } public class Genestealer extends Entity { } And then in my main program go: Marine.sprite = // Load sprite for all instances of Marine Genestealer.sprite = // Load sprite for all instances of Genestealer I don't want to store the same sprite in every instance of the class. I want one for each type of class.