是否可以在
WPF或
Winforms类中使用System.ComponentModel.DataAnnotations并且它属于属性(例如required,Range,…)？
我想把我的验证放到attributs上.
谢谢
编辑1：
我写这个：
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;
}
}
但即使我将3设置为我的财产也没有发生任何事情
解决方法
是的,you can.这是
another article说明这一点.您甚至可以通过手动创建
ValidationContext在控制台应用程序中执行此操作：
public class DataAnnotationsValidator
{
public bool TryValidate(object @object,out ICollection<ValidationResult> results)
{
var context = new ValidationContext(@object,items: null);
results = new List<ValidationResult>();
return Validator.TryValidateObject(
@object,results,validateAllProperties: true
);
}
}
更新：
这是一个例子：
public class Recipe
{
[required]
[CustomValidation(typeof(AWValidation),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,items: null);
var results = new List<ValidationResult>();
var isValid = Validator.TryValidateObject(recipe,true);
if (!isValid)
{
foreach (var validationResult in results)
{
Console.WriteLine(validationResult.ErrorMessage);
}
}
}
}
请注意,ValidateId方法必须是public static并返回ValidationResult而不是boolean.另请注意传递给TryValidateObject方法的第四个参数,如果希望计算自定义验证器,则必须将其设置为true.
