boolean-logic

C# – Validate an IP address

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Use IPAddress.Parse() to parse an IP address from a string. This handles both IPv4 and IPv6 addresses and throws an exception if the string can’t be parsed into a valid IP address. Here’s an example: This outputs the following: Use IPAddress.TryParse() if you don’t want exceptions to be thrown. It returns false if the string … Read more

C# – How to convert char to int

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Converting a char to an int means getting the numeric value that the char represents (i.e. ‘1’ to 1). This is not the same as casting the char to an int, which gives you the char’s underlying value (i.e. ‘1’ is 49). There are three ways to convert a char to an int: I’ll show … Read more

ASP.NET Core – Client-side custom validation attributes

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I wrote about how to add custom validation attributes. These are used for model validation on the server-side. You can also use these for client-side validation, which I’ll show in this article. 1 – Implement IClientModelValidator The first step is to implement the IClientModelValidator interface in the custom validation attribute class. This has a single … Read more