Although know to see the person should be very few, but still write for posterity to learn to communicate!
Xamarin.Forms due to the two-way binding of the native support data, the development of the Form class application is just like a duck to the surface, such applications must have the validation of the data at the time of submission, the native Android or iOS development model may have to judge the content of each edittext, Forms only need to validate the model that needs to be submitted, and it can be used with open source projects Fluentvalidation
About the use of fluentvalidation is not much introduced, this aspect of the use can refer to:
Http://www.cnblogs.com/asxinyu/p/dotnet_Opensource_project_FluentValidation_1.html
Attention:
Do not use the package in NuGet directly in the forms, download the project in NuGet, and then compile fluentvalidation.portable, using the resulting DLL file
Issues that arise directly from using NuGet:
Debug and normal release mode are OK, but in the case of "Embed assemblies into native code" check (release mode), compile will error
Xamarin.Forms's fluentvalidation (model validation)