/// <summary>
/// 访问表示方法调用的节点
/// </summary>
/// <param name="node">方法调用节点</param>
/// <param name="visitor">访问器</param>
/// <returns></returns>
public override Expression VisitMethodCall(MethodCallExpression node, ExpressionVisitorBase visitor)
{
Type type = node.Object != null ? node.Object.Type : node.Arguments[0].Type;
string methodName = string.Empty;
if (type == typeof(string) || node.Method.Name == "ToString")
{
methodName = "VisitStrMethodCall_";
}
else if (typeof(System.Collections.IEnumerable).IsAssignableFrom(type))
{
methodName = "VisitEnumMethodCall_";
}
if (!string.IsNullOrEmpty(methodName))
{
MemberAccess_Method invoker = null;
MethodCallExressionVisitor._methods.TryGetValue(methodName + node.Method.Name, out invoker);
if (invoker != null)
{
object exp = invoker.Invoke(this, new object[] { node, visitor });
return(exp as Expression);
}
}
throw new XfwException("{0}.{1} is not supported.", node.Method.DeclaringType, node.Method.Name);
}
/// <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="validateAllProperties">若要验证所有属性</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 validateAllProperties, bool breakOnFirstError)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// 如果验证所有的错误，则使用微软默认的校验
if (!breakOnFirstError)
{
return(Validator.TryValidateObject(instance, validationContext, validationResults, validateAllProperties));
}
// 当第一个错误产生时，是否不再进行后续验证
// ValidateObject 会验证所有，故可能需要重写
IEnumerable collection = _ma_Method.Invoke(null, instance, validationContext, validateAllProperties, true) as IEnumerable;
if (collection == null)
{
return(true);
}
bool isValid = true;
IEnumerator iterator = collection.GetEnumerator();
while (iterator.MoveNext())
{
isValid = false;
Type type = iterator.Current.GetType();
if (_pi == null)
{
_pi = type.GetProperty("ValidationResult", BindingFlags.Instance | BindingFlags.NonPublic);
_ma_Property = new MemberAccess_Method(_pi.GetGetMethod(true));
}
object obj = iterator.Current;
ValidationResult result = (ValidationResult)_ma_Property.Invoke(iterator.Current);
if (validationResults != null)
{
validationResults.Add(result);
}
break;
}
return(isValid);
}
/// <summary>
/// 访问表示字段或者属性的属性的节点 a.Name.Length
/// </summary>
/// <param name="node">字段或者属性节点</param>
/// <param name="visitor">访问器</param>
/// <returns></returns>
public override Expression VisitMemberMember(MemberExpression node, ExpressionVisitorBase visitor)
{
Type type = node.Expression.Type;
string methodName = string.Empty;
if (type == typeof(string))
{
methodName = "VisitStrMember_";
}
if (!string.IsNullOrEmpty(methodName))
{
MemberAccess_Method invoker = null;
MethodCallExressionVisitor._methods.TryGetValue(methodName + node.Member.Name, out invoker);
if (invoker != null)
{
object exp = invoker.Invoke(this, new object[] { node, visitor });
return(exp as Expression);
}
}
throw new XfwException("{0}.{1} is not supported.", node.Member.DeclaringType, node.Member.Name);
}
static XValidator()
{
_mi = typeof(Validator).GetMethod("GetObjectValidationErrors", BindingFlags.Static | BindingFlags.NonPublic);
_ma_Method = new MemberAccess_Method(_mi);
}