企业库5.0，抽象基类中的验证

我的业务层使用称为DomainObject的抽象基类实现IDataErrorInfo，为WPF提供验证绑定。当我调用在基类中实现的“Error”属性时，没有发现错误（我的测试产生两个验证错误）。如果我重写了派生类中的属性，所有的东西都如预期的那样发现并且发现了验证错误。我的猜测是在“ValidateFromAttributes”方法中反射的问题......？企业库5.0，抽象基类中的验证

我的示例应该返回两个错误。

这是我的代码：

using System.ComponentModel; 
using System.ComponentModel.DataAnnotations; 
using System.Data.Objects.DataClasses; 
using System.Text; 
using Microsoft.Practices.EnterpriseLibrary.Validation; 
using Microsoft.Practices.EnterpriseLibrary.Validation.Validators; 
using ValidationResult = 
    Microsoft.Practices.EnterpriseLibrary.Validation.ValidationResult;  

public interface IDomainObject 
{ 
    string Name { set; get; } 
} 

public abstract class DomainObject<T> 
    : IDataErrorInfo where T : IDomainObject 
{ 
    protected DomainObject() 
    { 
    } 

    protected DomainObject(EntityObject entityObject) 
    { 
     _entityObject = entityObject; 
    } 

    public string this[string columnName] 
    { 
     get 
     { 
      ValidationResults results = Validation.ValidateFromAttributes(this); 

      foreach (ValidationResult result in results) 
      { 
       if (result.Key == columnName) 
       { 
        return result.Message; 
       } 
      } 
      return string.Empty; 
     } 
    } 

    // *** This dosen't work and returns NO errors 
    public virtual string Error 
    { 
     get 
     { 
      StringBuilder error = new StringBuilder(); 
      ValidationResults results = Validation.ValidateFromAttributes(this); 

      foreach (ValidationResult result in results) 
      { 
       error.AppendLine(result.Message); 
      } 
      return error.ToString(); 
     } 
    } 

    private EntityObject _entityObject; 
    internal EntityObject Entity 
    { 
     get { return _entityObject; } 
     set { _entityObject = value; } 
    } 
} 

[HasSelfValidation] 
public class BoInvestment : DomainObject<BoInvestment>, 
    IDomainObject 
{ 
    public BoInvestment(){} 

    internal BoInvestment(EntityObject entityObject) : base(entityObject) {} 

    [Required] 
    [StringLengthValidator(7, 
     MessageTemplate = "Name is too long")] 
    public string Name { get; set; } 

    [SelfValidation] 
    public void Validate(ValidationResults validationResults) 
    { 
     if (Name != "Test") 
      validationResults.AddResult(new ValidationResult(
       "Name ist falsch",this,"Name",null,null)); 
    } 

    // *** This works and returns two errors 
    //public override string Error 
    //{ 
    // get 
    // { 
    //  StringBuilder error = new StringBuilder(); 
    //  ValidationResults results = Validation.ValidateFromAttributes(this); 

    //  foreach (ValidationResult result in results) 
    //  { 
    //   error.AppendLine(result.Message); 
    //  } 
    //  return error.ToString(); 
    // } 
    //}  
}

这是单元测试：

[TestMethod] 
public void ELValidation() 
{ 
    BoInvestment investment = new BoInvestment(); 
    investment.Name = "TestError"; 

    Console.WriteLine(investment.Error); 
}

来源

2011-03-15 SolarX

尝试使用ValidationFactory代替。例如：

string IDomainObject.Error 
{ 
    get 
    { 
     var v = ValidationFactory.CreateValidator(this.GetType()); 
     var results = v.Validate(this); 
     return string.Join(" ", 
      results.Select(r => r.Message).ToArray()); 
    } 
}

摘自this blog。

来源

2011-03-15 14:36:50 Steven

企业库5.0，抽象基类中的验证

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