CODEWITHSUNDEEP
c#wpfwinformsvalidationc#-4.0
DooDoo
DooDoo

Reputation: 13447

How to use System.ComponentModel.DataAnnotations in WPF or Winforms application

is it possible to use System.ComponentModel.DataAnnotations and it's belong attribute(such as Required,Range,...) in WPF or Winforms class?

I want put my validation to attributs.

thanks

EDIT 1:

I write this :

public class Recipe
{
    [Required]
    [CustomValidation(typeof(AWValidation), "ValidateId", ErrorMessage = "nima")]
    public int Name { get; set; }
}

private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        var recipe = new Recipe();
        recipe.Name = 3;
        var context = new ValidationContext(recipe, serviceProvider: null, items: null);
        var results = new List<System.ComponentModel.DataAnnotations.ValidationResult>();

        var isValid = Validator.TryValidateObject(recipe, context, results);

        if (!isValid)
        {
            foreach (var validationResult in results)
            {
                MessageBox.Show(validationResult.ErrorMessage);
            }
        }
    }

public class AWValidation
{
    public bool ValidateId(int ProductID)
    {
        bool isValid;

        if (ProductID > 2)
        {
            isValid = false;
        }
        else
        {
            isValid = true;
        }

        return isValid;
    }        
}

but even I set 3 to my property nothing happend

Upvotes: 8

Views: 10320

Answers (1)

Darin Dimitrov
Darin Dimitrov

Reputation: 1038890

Yes, you can. And here's another article illustrating this. You could do this even in a console application by manually creating a ValidationContext:

public class DataAnnotationsValidator
{
    public bool TryValidate(object @object, out ICollection<ValidationResult> results)
    {
        var context = new ValidationContext(@object, serviceProvider: null, items: null);
        results = new List<ValidationResult>();
        return Validator.TryValidateObject(
            @object, context, results, 
            validateAllProperties: true
        );
    }
}

UPDATE:

Here's an example:

public class Recipe
{
    [Required]
    [CustomValidation(typeof(AWValidation), "ValidateId", ErrorMessage = "nima")]
    public int Name { get; set; }
}

public class AWValidation
{
    public static ValidationResult ValidateId(int ProductID)
    {
        if (ProductID > 2)
        {
            return new ValidationResult("wrong");
        }
        else
        {
            return ValidationResult.Success;
        }
    }
}

class Program
{
    static void Main()
    {
        var recipe = new Recipe();
        recipe.Name = 3;
        var context = new ValidationContext(recipe, serviceProvider: null, items: null);
        var results = new List<ValidationResult>();

        var isValid = Validator.TryValidateObject(recipe, context, results, true);

        if (!isValid)
        {
            foreach (var validationResult in results)
            {
                Console.WriteLine(validationResult.ErrorMessage);
            }
        }
    }
}

Notice that the ValidateId method must be public static and return ValidationResult instead of boolean. Also notice a fourth argument passed to the TryValidateObject method which must be set to true if you want your custom validators to be evaluated.

Upvotes: 10

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