how do i apply Validation Attributes to WPF

Question

In my project i have this window to add new `Contact` object My Question is how i apply this Validation Attributes to WPF window like i do in Asp.net MVC .. like `[Required]` and some `[ReularExpression()]` ```

Accepted Answer

Create ValidatorBase It implements the standard .net IDataErrorInfo. It works under WPF but should also work with Windows Forms. ``` public abstract class ValidatorBase : IDataErrorInfo { string IDataErrorInfo.Error { get { throw new NotSupportedException("IDataErrorInfo.Error is not supported, use IDataErrorInfo.this[propertyName] instead."); } } string IDataErrorInfo.this[string propertyName] { get { if (string.IsNullOrEmpty(propertyName)) { throw new ArgumentException("Invalid property name", propertyName); } string error = string.Empty; var value = GetValue(propertyName); var results = new List(1); var result = Validator.TryValidateProperty( value, new ValidationContext(this, null, null) { MemberName = propertyName }, results); if (!result) { var validationResult = results.First(); error = validationResult.ErrorMessage; } return error; } } private object GetValue(string propertyName) { PropertyInfo propInfo = GetType().GetProperty(propertyName); return propInfo.GetValue(this); } } ``` - Make Contact to Inherit of ValidatorBase ``` public class MContact : ValidatorBase { [Required(ErrorMessage = " Name is required.")] [StringLength(50, ErrorMessage = "No more than 50 characters")] [Display(Name = "Name")] public string Name { get; set; } ``` - Don't forget to put some validation trigger on controls to be validated ``` ``` - Add some style to display an error tooltip on all textboxes ``` ``` The code is on Github : https://github.com/EmmanuelDURIN/wpf-attribute-validation Inspired from : https://code.msdn.microsoft.com/windowsdesktop/Validation-in-MVVM-using-12dafef3 Happy implementation :-)

how do i apply Validation Attributes to WPF

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