Validate using attributes in MVVM

Introduction

The goal here is to create an easy way to add validation to properties when working with xaml and MVVM.

I have chosen this approach:


[ValidateMethod("ValidateFirstName")]
public string FirstName
{
    get { return firstName; }
    set { SetProperty(ref firstName, value); }
}

public string ValidateFirstName()
{
    if (string.IsNullOrEmpty(FirstName))
    {
        return "First name is mandatory";
    }

    return string.Empty;
}

Simple attribute referring to a method by string. The method then handles the validation.
The reason for choosing attributes is to make validation on properties easy to spot for all developers reading the code.

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Validate using attributes in MVVM