ポータブル ライブラリ クラスでドメイン オブジェクトを作成しています。それらは実装する必要がINotifyPropertChangedあり、INotifyDataErrorInfo
したがって、私のドメインクラスはこの基本クラスを実装する必要があります
public abstract class DomainObject : INotifyPropertyChanged, INotifyDataErrorInfo
{
private ErrorsContainer<ValidationResult> errorsContainer;
protected DomainObject() {}
public event PropertyChangedEventHandler PropertyChanged;
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
public bool HasErrors
{
get { return this.ErrorsContainer.HasErrors; }
}
protected ErrorsContainer<ValidationResult> ErrorsContainer
{
get
{
if (this.errorsContainer == null)
{
this.errorsContainer =
new ErrorsContainer<ValidationResult>(pn => this.RaiseErrorsChanged(pn));
}
return this.errorsContainer;
}
}
public IEnumerable GetErrors(string propertyName)
{
return this.errorsContainer.GetErrors(propertyName);
}
protected void RaisePropertyChanged(string propertyName)
{
this.OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
var handler = this.PropertyChanged;
if (handler != null)
{
handler(this, e);
}
}
protected void ValidateProperty(string propertyName, object value)
{
if (string.IsNullOrEmpty(propertyName))
{
throw new ArgumentNullException("propertyName");
}
this.ValidateProperty(new ValidationContext(this, null, null) { MemberName = propertyName }, value);
}
protected virtual void ValidateProperty(ValidationContext validationContext, object value)
{
if (validationContext == null)
{
throw new ArgumentNullException("validationContext");
}
List<ValidationResult> validationResults = new List<ValidationResult>();
Validator.TryValidateProperty(value, validationContext, validationResults);
this.ErrorsContainer.SetErrors(validationContext.MemberName, validationResults);
}
protected void RaiseErrorsChanged(string propertyName)
{
this.OnErrorsChanged(new DataErrorsChangedEventArgs(propertyName));
}
protected virtual void OnErrorsChanged(DataErrorsChangedEventArgs e)
{
var handler = this.ErrorsChanged;
if (handler != null)
{
handler(this, e);
}
}
}
しかし、私はこの行でそれを実現しました
this.ValidateProperty(new ValidationContext(this, null, null)
{ MemberName = propertyName }, value);
コンストラクタがないため、オブジェクト ValidationContext を作成できません。新しいものを作成するにはどうすればよいですか?
UPDATE 私のインテリセンスによると、これには含まれています。
#region Assembly System.ComponentModel.DataAnnotations.dll, v2.0.5.0
// C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.0\Profile\Profile46\System.ComponentModel.DataAnnotations.dll
#endregion
using System;
using System.Collections.Generic;
namespace System.ComponentModel.DataAnnotations
{
// Summary:
// Describes the context in which a validation check is performed.
public sealed class ValidationContext
{
// Summary:
// Gets or sets the name of the member to validate.
//
// Returns:
// The name of the member to validate.
public string DisplayName { get; set; }
//
// Summary:
// Gets the dictionary of key/value pairs that is associated with this context.
//
// Returns:
// The dictionary of the key/value pairs for this context.
public IDictionary<object, object> Items { get; }
//
// Summary:
// Gets or sets the name of the member to validate.
//
// Returns:
// The name of the member to validate.
public string MemberName { get; set; }
//
// Summary:
// Gets the object to validate.
//
// Returns:
// The object to validate.
public object ObjectInstance { get; }
//
// Summary:
// Gets the type of the object to validate.
//
// Returns:
// The type of the object to validate.
public Type ObjectType { get; }
// Summary:
// Returns the service that provides custom validation.
//
// Parameters:
// serviceType:
// The type of the service to use for validation.
//
// Returns:
// An instance of the service, or null if the service is not available.
public object GetService(Type serviceType);
}
}