Function pointers in C Let’s start with a basic function which we will be pointing to: int addInt(int n, int m) { return n+m; } First thing, let’s define a pointer to a function which receives 2 ints and returns an int: int (*functionPtr)(int,int); Now we can safely point to our function: functionPtr = &addInt; … Read more
This isn’t C# per se, but I haven’t seen anyone who really uses System.IO.Path.Combine() to the extent that they should. In fact, the whole Path class is really useful, but no one uses it! I’m willing to bet that every production app has the following code, even though it shouldn’t: string path = dir + … Read more
For what it’s worth, a Dictionary is (conceptually) a hash table. If you meant “why do we use the Dictionary<TKey, TValue> class instead of the Hashtable class?”, then it’s an easy answer: Dictionary<TKey, TValue> is a generic type, Hashtable is not. That means you get type safety with Dictionary<TKey, TValue>, because you can’t insert any … Read more
public static readonly fields are a little unusual; public static properties (with only a get) would be more common (perhaps backed by a private static readonly field). const values are burned directly into the call-site; this is double edged: it is useless if the value is fetched at runtime, perhaps from config if you change … Read more
The easiest way I can think of is to use Linq: List<Order> SortedList = objListOrder.OrderBy(o=>o.OrderDate).ToList();
The simplest way is an anonymous method passed into Label.Invoke: // Running on the worker thread string newText = “abc”; form.Label.Invoke((MethodInvoker)delegate { // Running on the UI thread form.Label.Text = newText; }); // Back on the worker thread Notice that Invoke blocks execution until it completes–this is synchronous code. The question doesn’t ask about asynchronous … Read more
The source referenced by the OP has some credibility …but what about Microsoft – what is the stance on struct usage? I sought some extra learning from Microsoft, and here is what I found: Consider defining a structure instead of a class if instances of the type are small and commonly short-lived or are commonly … Read more
You can use Convert.ToHexString starting with .NET 5. There’s also a method for the reverse operation: Convert.FromHexString. For older versions of .NET you can either use: public static string ByteArrayToString(byte[] ba) { StringBuilder hex = new StringBuilder(ba.Length * 2); foreach (byte b in ba) hex.AppendFormat(“{0:x2}”, b); return hex.ToString(); } or: public static string ByteArrayToString(byte[] ba) … Read more
Here is how I understood not just what virtual functions are, but why they’re required: Let’s say you have these two classes: class Animal { public: void eat() { std::cout << “I’m eating generic food.”; } }; class Cat : public Animal { public: void eat() { std::cout << “I’m eating a rat.”; } }; … Read more
I guess this document might serve as a not so short introduction : n3055 The whole massacre began with the move semantics. Once we have expressions that can be moved and not copied, suddenly easy to grasp rules demanded distinction between expressions that can be moved, and in which direction. From what I guess based … Read more