![]() This uses the same libphonenumber validation library behind the scenes, but it can also provide extra details such as carrier information (in the US), the type of the phone number (landline/mobile/VOIP), or details of suspected fraud associated with the number. This post on the Twilio blog shows how to use it in your applications.Īlternatively, you could use the Twilio Lookup API to validate phone numbers. There's a C# port of the library, libphonenumber-csharp, that you can install in your application using the NuGet package. Unfortunately, this attribute is simplistic and doesn't take into account the highly complex set of rules and exceptions that apply to phone numbers.įor better validation you could use the open source library that Google created and uses for validating phone numbers: libphonenumber. These attributes are found in the namespace, which includes a attribute for validating phone numbers. For example,, and are validation attributes that check the value of the InputModel.Email property is correct. Razor Pages uses the same model binding and model validation processes as MVC, but applies them to a "Page Model" instead of action method parameters. See my previous post for an introduction on Razor Pages, and how they differ from ASP.NET Core MVC. It's very similar to the traditional Model-View-controller (MVC) pattern commonly used in ASP.NET Core, but uses a "page-based" approach. ![]() Razor Pages is a new aspect of ASP.NET Core MVC that was introduced in ASP.NET Core 2.0. Data validation in ASP.NET Core Razor Pages It's separate from this blog post tutorial but will give you a full run down of many APIs at once. NET Core application then checkout this free 5-part video series. If you would like to see a full integration of Twilio APIs in a. You can find the complete code for this post on GitHub. A familiarity with Razor Pages (see my previous post for an introduction to Razor Pages).VS Code, Visual Studio 2017, or other editor.NET Core 2.2 SDK ( version 2.2.102 or greater) A Twilio account ( sign up for a free Twilio account here).To follow along with this post you'll need: Twilio's Lookup API can provide this functionality in a Razor Pages app that uses ASP.NET Core Identity for user management. Multiple stages of validation are required to determine if a phone number can be associated with an application user for a specific purpose, but I'll only be looking at the first step in this post: ensuring a number is valid for a specific country and determining if it is likely to be able to receive text messages. Alternatively you could use various Twilio APIs to thoroughly validate the phone number, lookup details about the number (such as carrier or type), and prove ownership of the phone with a text or voice verification message. You could implement improved validation using the library libphonenumber-csharp, as described in a previous Twilio blog post. You can improve the robustness of ASP.NET Core’s phone number validation and provide a better user experience by integrating Twilio’s telephony features in your application.īy default the phone number in ASP.NET Core Identity is validated with a regular expression, but that's too basic to confirm whether the number is really valid, whether it includes the country dialling code, or whether it can receive SMS messages. It includes many features out of the box and has basic support for storing a phone number for a user. ASP.NET Core Identity is a membership system that adds login and user functionality to ASP.NET Core apps.
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