byte-array

C# – How to create a file and write to it

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There are a few ways to create a file and write to it using the .NET File API (in System.IO). The simplest way is to use high-level methods like File.WriteAllText() and File.WriteAllLines(), specifying the file path and string(s) to write to the file. Here’s an example of using these (and their async equivalents): These high-level … Read more

C# – How to create a custom exception

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To create a custom exception, create a subclass of the Exception class, like this: Then throw it just like you would any other exception, like this: It’s a good idea to call the base constructor from your constructor and pass in your custom error message. If this exception is unhandled, or if you are logging … Read more

C# – Check if an IP range is valid

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Given an IP range as a starting IP address and an ending IP address (as strings, like from user input or a config file), you can check if the IP range is valid by doing the following steps: Here’s an example. Let’s say you’re given starting IP “192.168.0.1” and ending “192.168.0.11”. The following table shows … Read more

C# – Hex string to byte array

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This article shows code for converting a hex string to a byte array, unit tests, and a speed comparison. First, this diagram shows the algorithm for converting a hex string to a byte array. To convert a hex string to a byte array, you need to loop through the hex string and convert two characters … Read more

C# – Pass in a Func to override behavior

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If I want to change the behavior of a method from the outside, I can pass in a function pointer. This approach exists in every language, and is one way to implement the Strategy Pattern. In C#, function pointers are referred to as delegates, and the two most common ones are Action and Func. The … Read more