Caliburn.Micro.Validation

What is it and what is it for at a glance

A small extension for Caliburn.Micro which enables fluent builder style validation rules. For example:

public class PaymentEditorViewModel() : ValidatingScreen
{
  public PaymentEditorViewModel()
  {
    AddValidationRule(() => PaymentSum).Condition(() => PaymentSum <= 0).Message("Please enter payment sum");
  }
  
  #region PaymentSum property
  decimal _PaymentSum;
  public decimal PaymentSum
  {
    get
    {
      return _PaymentSum;
    }
    set
    {
      _PaymentSum = value;
      NotifyOfPropertyChange(() => PaymentSum);
    }
  }
  #endregion
}

##Quick start

Create your Caliburn.Micro powered project.
Clone Caliburn.Micro.Validation to your solution and reference it in the project.
Create some view models according to your needs and derive its from ValidatingConductor or ValidatingScreen:

public class OrderLine : ValidatingScreen 
{
  string _Number;
  public string ProductName 
  { 
    get
    {
      return _ProductName;
    }
    set
    {
      _ProductName = value;
    }
  }
}

public class Order : ValidatingConductor<OrderLine>.Collection.OneActive
{
}

Add some validation rules to the Screen ViewModel. Of course you can add validation rules to the Conductor too:

...
  // Constructor
  public OrderLine()
  {
    AddValidationRule(() => Number).Condition(() => string.IsNullOrWhitespace(Number)).Message("Please fill the product name");
  }
...

Please note: conductor will validate through its screens automatically gathering validation results for you.

Create some views for view model. Do not forget bind any control to the 'Error' property.

RafaelONascimento/Caliburn.Micro.Validation

Caliburn.Micro.Validation

What is it and what is it for at a glance