From the C# documentation it states that the @ symbol is an Identifier. 2.4.2 Identifiers The prefix “@” enables the use of keywords as identifiers, which is useful when interfacing with other programming languages. The character @ is not actually part of the identifier, so the identifier might be seen in other languages as a […]
Tag: C#
Was detecting a file stream if it was Unicode encoded or not, so though I would share the code. Let say you an xml file that you need to detect if it has the Unicode BOM in the file. If you wish to know more about BOM look it up at wikipedia
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//open the helloworld.xml file Stream fs = new FileStream("helloworld.xml", FileMode.Open); byte[] bits = new byte[3]; fs.Read(bits, 0, 3); // UTF8 BOM is like 0xEF,0xBB,0xBF if (bits[0] == 0xEF && bits[1] == 0xBB && bits[2] == 0xBF) { //utf8 do something } //UTF16 BOM is like 0xFF, 0xFE if (bits[0] == 0xFF && bits[1] == 0xFE) { //utf16 do something } |
Hope that […]
C# Func vs. Action? What is the difference between a Func vs an Action in C#? The main difference is whether one wants the delegate to return a value or not. By using Func it will expect the delegate to return a value and Action for no value (void) 1. Func for methods that return […]
Recently I was asked a simple code to improve the performance, and at first I couldn’t see it but as you know your brain starts working when you aren’t thinking of the problem anymore. (It happen to me when I was driving) Anyway the problem on hand was there is a for loop and when […]
Here is some poorly written code that I had to review today and modify (i.e refactor). I have removed the domain of the code and renamed the variables, so that it remains anonymous, but the just of the code is still intact.
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var itemCount = 0; if (users.ShoppingCart != null && user.ShoppingCart > 0) { foreach (var cart in user.ShoppingCart) { if (cart.Items != null && cart.Items.Count > 0) { foreach (var item in cart.Items) { itemCount++; } } } } |
Lets go through the inner loop of the code first. First the […]
Here is a quick way to detect if a text is in Canadian Aboriginal Syllabic in C#. It is just an extension method that would detect if your string is in that range by using regex.
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public static bool IsInuktitut(this string input) { if (string.IsNullOrEmpty(input)) { return false; } //http://msdn.microsoft.com/en-us/library/20bw873z.aspx //look at section Supported Named Blocks const string pattern = @"\p{IsUnifiedCanadianAboriginalSyllabics}"; Match match = Regex.Match(input, pattern); return match.Success; } |
Enjoy.
Here is a nice little code I did recently, where the Command Pattern is used with a notification observer like pattern. First of the Command Pattern, a simple interface for task with an execute method
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public interface ITask { /// <summary> /// Execute the task /// </summary> void Execute(); } |
Then the notification interface, with 2 methods, one when it started and one when its complete and the event […]
In this last part of the series I wanted to talk about how to register automapper at startup of your web application, in doing so it would help speed things up with automapper. There are many ways to do it, the easiest way is to just have a method inside Global.asax.cs file in your Application_Start […]
In this part I will show how we can use a customer value formatter (CustomFormatter) to format our mapped data into single “Number of Order:” and plural “Number of Orders:”. First the Domain and Dto (data transfer object)
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//Domain public class Order { public string OrderNo { get; set; } public Customer Customer { get; set; } public DateTime PurchaseDate { get; set; } public IEnumerable<OrderItems> LineItems { get; set; } public bool ShipToHomeAddress { get; set; } public decimal GetTotal() { return LineItems == null ? 0 : LineItems.Sum(x => x.GetTotalPrice()); } public Guid InternalId { get; set; } } //Dto public class NumberOfOrderDto { public string CustomerName { get; set; } public string NumberOfOrders { get; set; } } |
Now we will introduce a CustomResolver and Formatter, for the Formatter we are inheriting from IValueFormatter […]
In Part 5, we will use a powerful feature that automapper allows us, which is CustomResolver. Lets look at our Domain Object which contains a boolean field called ShipToHomeAddress, what we will do is map those boolean to a string value with “Yes” or “No”.
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public class Order { public string OrderNo { get; set; } public Customer Customer { get; set; } public DateTime PurchaseDate { get; set; } public IEnumerable<OrderItems> LineItems { get; set; } public bool ShipToHomeAddress { get; set; } public decimal GetTotal() { return LineItems == null ? 0 : LineItems.Sum(x => x.GetTotalPrice()); } public Guid InternalId { get; set; } } //DTO public class OrderShipDto { public string ShipHome { get; set; } public string CustomerName { get; set; } } |
For our mapping code we will introduce CustomResolver class […]
