我有一个包含扩展方法的类，可以让我像这样读取数据注释：
int maxRefLen = ReflectionAPI.GetProperty<Organisation, String>(x => x.Name)
.GetAttribute<StringLengthAttribute>()
.GetValueOrDefault(x => x.MaximumLength, 256);
因此，如果您使用它，您应该能够像这样获取EditableAttribute 的值：
bool isEditable = ReflectionAPI.GetProperty<Foo, String>(x => x.NomInvertebrat)
.GetAttribute<EditableAttribute>()
.GetValueOrDefault(x => x.AllowEdit, true);
至于在运行时设置数据注释，我自己没有做过，但我读到这里有一个解决方案：Setting data-annotations at runtime
获取我认为需要reading the entity framework metadata 的特定类型的所有数据注释的列表。同样，我还没有尝试过。
如果你把它加在一起，我个人认为它感觉笨重而不是优雅，但你已经要求使用DataAnnotations 的解决方案，更优雅的东西可能意味着进入你的架构。
我倾向于这样做：
public bool StartDateIsReadOnly
{
//use this property client-side to disable the input
get{ return Project.IsStarted;}
}
//Implement IValidatable object to do server side validation
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext
{
bool startdateIsChanged = // I'll leave you to work out this bit
var results = new List<ValidationResult>();
if(StartDateIsReadOnly && startdateIsChanged)
results.Add(new ValidationResult("Start Date cannot be changed after project is started");
}
这里是 ReflectionAPI 类：
请注意，该课程包含@JonSkeet 发布并描述为“邪恶”的部分黑客攻击。我个人认为这一点还不错，但您应该阅读以下参考资料：
Override a generic method for value types and reference types.
Evil code - overload resolution workaround
public static class ReflectionAPI
{
public static int GetValueOrDefault<TInput>(this TInput a, Func<TInput, int> func, int defaultValue)
where TInput : Attribute
//Have to restrict to struct or you get the error:
//The type 'R' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Nullable<T>'
{
if (a == null)
return defaultValue;
return func(a);
}
public static Nullable<TResult> GetValueOrDefault<TInput, TResult>(this TInput a, Func<TInput, TResult> func, Nullable<TResult> defaultValue)
where TInput : Attribute
where TResult : struct
//Have to restrict to struct or you get the error:
//The type 'R' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Nullable<T>'
{
if (a == null)
return defaultValue;
return func(a);
}
//In order to constrain to a class without interfering with the overload that has a generic struct constraint
//we need to add a parameter to the signature that is a reference type restricted to a class
public class ClassConstraintHack<T> where T : class { }
//The hack means we have an unused parameter in the signature
//http://msmvps.com/blogs/jon_skeet/archive/2010/11/02/evil-code-overload-resolution-workaround.aspx
public static TResult GetValueOrDefault<TInput, TResult>(this TInput a, Func<TInput, TResult> func, TResult defaultValue, ClassConstraintHack<TResult> ignored = default(ClassConstraintHack<TResult>))
where TInput : Attribute
where TResult : class
{
if (a == null)
return defaultValue;
return func(a);
}
//I don't go so far as to use the inheritance trick decribed in the evil code overload resolution blog,
//just create some overloads that take nullable types - and I will just keep adding overloads for other nullable type
public static bool? GetValueOrDefault<TInput>(this TInput a, Func<TInput, bool?> func, bool? defaultValue)
where TInput : Attribute
{
if (a == null)
return defaultValue;
return func(a);
}
public static int? GetValueOrDefault<TInput>(this TInput a, Func<TInput, int?> func, int? defaultValue)
where TInput : Attribute
{
if (a == null)
return defaultValue;
return func(a);
}
public static T GetAttribute<T>(this PropertyInfo p) where T : Attribute
{
if (p == null)
return null;
return p.GetCustomAttributes(false).OfType<T>().LastOrDefault();
}
public static PropertyInfo GetProperty<T, R>(Expression<Func<T, R>> expression)
{
if (expression == null)
return null;
MemberExpression memberExpression = expression.Body as MemberExpression;
if (memberExpression == null)
return null;
return memberExpression.Member as PropertyInfo;
}
}