如何忽略映射的代码使用代码映射“约定”

Question

有没有什么办法可以避免使用映射的代码约定使用NHibernate 3.2映射属性？默认情况下，所有属性都被映射。

Answer 1

有两个选项，据我所知：

1）扩大ConventionModelMapper和SimpleModelInspector延长IsPersistentProperty使得它满足您的需求。

2）使用IsPersistentProperty如下：

... 
mapper.IsPersistentProperty((memberInfo, declared) => IsPersistentProperty(mapper.ModelInspector, memberInfo, declared, "YourPropertyName")); 
... 


public static bool IsPersistentProperty(IModelInspector modelInspector, MemberInfo member, bool declared, string propertyName) 
{ 
    return (declared ||(member is PropertyInfo) && !IsReadOnlyProperty(member)) && !member.Name.Equals(propertyName); 
} 

private static bool IsReadOnlyProperty(MemberInfo subject) 
{ 
    const BindingFlags defaultBinding = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly; 

    var property = subject as PropertyInfo; 
    if (property == null) 
    { 
     return false; 
    } 
    if (CanReadCantWriteInsideType(property) || CanReadCantWriteInBaseType(property)) 
    { 
     return !PropertyToField.DefaultStrategies.Values.Any(s => subject.DeclaringType.GetField(s.GetFieldName(property.Name), defaultBinding) != null) || IsAutoproperty(property); 
    } 
    return false; 
} 

private static bool IsAutoproperty(PropertyInfo property) 
{ 
    return property.ReflectedType.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance 
                      | BindingFlags.DeclaredOnly).Any(pi => pi.Name == string.Concat("<", property.Name, ">k__BackingField")); 
} 

private static bool CanReadCantWriteInsideType(PropertyInfo property) 
{ 
    return !property.CanWrite && property.CanRead && property.DeclaringType == property.ReflectedType; 
} 

private static bool CanReadCantWriteInBaseType(PropertyInfo property) 
{ 
    if (property.DeclaringType == property.ReflectedType) 
    { 
     return false; 
    } 
    var rfprop = property.DeclaringType.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance 
                      | BindingFlags.DeclaredOnly).SingleOrDefault(pi => pi.Name == property.Name); 
    return rfprop != null && !rfprop.CanWrite && rfprop.CanRead; 
} 

Answer 2

重复：Ignore column using mapping by code in HNibernate

您可以使用以下方法：

mapper.IsPersistentProperty((mi, declared) => 
              { 
               if (mi.DeclaringType == typeof (YourType) && mi.Name == "PropertyNameToIgnore") 
                return false; 
               return true; 
              }); 

Answer 3

2）作为替代复制&糊IsPersistentProperty的默认实现它可以通过反射被重复使用：

var mapper = new ConventionModelMapper(); 
var field = mapper.ModelInspector.GetType() 
    .GetField("isPersistentProperty", BindingFlags.NonPublic | BindingFlags.Instance); 

var ispp = (Func<MemberInfo, bool, bool>)field.GetValue(mapper.ModelInspector); 
mapper.IsPersistentProperty((mi, b) => ispp(mi, b) 
    && (/*any conditions here*/ mi.Name != "SomeFiledName")); 

条件可以被移动到单独的方法或类。一个基于表达式的强类型包装可以在它上面完成。