/// <summary>
/// 通过使用验证上下文、验证结果集合和用于指定是否验证所有属性的值，确定指定的属性是否有效。
/// </summary>
/// <param name="instance">要验证的对象</param>
/// <param name="context">用于描述要验证的对象的上下文</param>
/// <param name="validationResults">用于包含每个失败的验证的集合</param>
/// <param name="breakOnFirstError">当第一个错误产生时，是否不再进行后续验证</param>
/// <param name="metadataType">实体类的元数据描述类，如果传空值，则从实体类的 <see cref="MetadataTypeAttribute"/> 特性上找</param>
/// <returns></returns>
public static bool TryValidateProperty(object value, ValidationContext context, ICollection <ValidationResult> validationResults, bool breakOnFirstError)
{
Type propertyType = XFrameworkValidator._store.GetPropertyType(context);
string memberName = context.MemberName;
//XFrameworkValidator.EnsureValidPropertyType(memberName, propertyType, value);
bool result = true;
IEnumerable <ValidationAttribute> propertyValidationAttributes = XFrameworkValidator._store.GetPropertyValidationAttributes(context);
foreach (XFrameworkValidator.ValidationError current in XFrameworkValidator.GetValidationErrors(value, context, propertyValidationAttributes, breakOnFirstError))
{
result = false;
if (validationResults != null)
{
validationResults.Add(current.ValidationResult);
}
}
return(result);
}
// 获取实例的属性值
private static IDictionary <ValidationContext, object> GetPropertyValues(object instance, ValidationContext context)
{
IDictionary <ValidationContext, object> result = new Dictionary <ValidationContext, object>();
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(instance.GetType());
foreach (var kv in typeRuntime.Invokers)
{
MemberInvokerBase invoker = kv.Value;
if (invoker.MemberType == System.Reflection.MemberTypes.Property)
{
ValidationContext context2 = XFrameworkValidator.CreateValidationContext(instance, context);
context2.MemberName = invoker.Member.Name;
if (XFrameworkValidator._store.GetPropertyValidationAttributes(context2).Any <ValidationAttribute>())
{
result.Add(context2, invoker.Invoke(instance));
}
}
}
return(result);
}
// 验证给定值
private static IEnumerable <XFrameworkValidator.ValidationError> GetValidationErrors(object value, ValidationContext validationContext, IEnumerable <ValidationAttribute> attributes, bool breakOnFirstError)
{
if (validationContext == null)
{
throw new ArgumentNullException("validationContext");
}
List <XFrameworkValidator.ValidationError> result = new List <XFrameworkValidator.ValidationError>();
XFrameworkValidator.ValidationError item;
foreach (ValidationAttribute attr in attributes)
{
if (!XFrameworkValidator.TryValidate(value, validationContext, attr, out item))
{
result.Add(item);
if (breakOnFirstError)
{
break;
}
}
}
return(result);
}
/// <summary>
/// 通过使用验证上下文、验证结果集合和用于指定是否验证所有属性的值，确定指定的对象是否有效。
/// </summary>
/// <param name="instance">要验证的对象</param>
/// <param name="validationContext">用于描述要验证的对象的上下文</param>
/// <param name="validationResults">用于包含每个失败的验证的集合</param>
/// <param name="breakOnFirstError">当第一个错误产生时，是否不再进行后续验证</param>
/// <returns></returns>
public static bool TryValidateObject(object instance, ValidationContext validationContext, ICollection <ValidationResult> validationResults, bool breakOnFirstError)//, Type metadataType = null)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
if (validationContext == null)
{
throw new ArgumentNullException("validationContext");
}
// 取当前实例的所有属性值
IDictionary <ValidationContext, object> propertyValues = XFrameworkValidator.GetPropertyValues(instance, validationContext);
List <XFrameworkValidator.ValidationError> list = new List <XFrameworkValidator.ValidationError>();
// 取元数据描述
Type metadataType = null;
//if (metadataType == null)
//{
Type type = instance.GetType();
MetadataTypeAttribute attr =
TypeDescriptor
.GetAttributes(type)
.OfType <MetadataTypeAttribute>()
.FirstOrDefault();
if (attr != null)
{
metadataType = attr.MetadataClassType;
}
//}
if (metadataType == null)
{
throw new NullReferenceException(string.Format("type {{{0}}} has no metadata descriptor.", type.Name));
}
PropertyDescriptorCollection descriptors = TypeDescriptor.GetProperties(metadataType);
// 按照元数据属性的书写顺序逐个验证实体属性
foreach (PropertyDescriptor des in descriptors)
{
KeyValuePair <ValidationContext, object> kv = propertyValues.FirstOrDefault(x => x.Key.MemberName == des.Name);
ValidationContext context = kv.Key;
object value = kv.Value;
if (context != null)
{
IEnumerable <ValidationAttribute> validationAttributes = XFrameworkValidator._store.GetPropertyValidationAttributes(context);
list.AddRange(XFrameworkValidator.GetValidationErrors(value, context, validationAttributes, breakOnFirstError));
}
if (list.Count > 0 && breakOnFirstError)
{
break;
}
}
bool result = true;
foreach (var current in list)
{
result = false;
if (validationResults != null)
{
validationResults.Add(current.ValidationResult);
}
}
return(result);
}
