C# 基类使用泛型时如何隐藏成员函数
我有以下类,当我在BaseScriptConfigurationList上调用C# 基类使用泛型时如何隐藏成员函数,c#,inheritance,C#,Inheritance,我有以下类,当我在BaseScriptConfigurationList上调用CreateQuerySettings时,它从ConfigurationList返回新的QuerySettings,而不是BaseScriptConfigurationList中的层次结构QuerySettings值: public abstract class ConfigurationList<TConfigurationObject, TPropertyEnum> { public QuerySe
CreateQuerySettings
时,它从ConfigurationList
返回新的QuerySettings
,而不是BaseScriptConfigurationList
中的层次结构QuerySettings
值:
public abstract class ConfigurationList<TConfigurationObject, TPropertyEnum>
{
public QuerySettings<TConfigurationObject, TPropertyEnum> CreateQuerySettings()
{
return new QuerySettings<TConfigurationObject, TPropertyEnum>();
}
}
public class BaseScriptConfigurationList : EditableConfigurationList<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
public BaseScriptConfigurationList(ConfigurationManager configurationManager)
: base(configurationManager, InternalAdminObjectType.BaseScript)
{
_BaseScriptPageListWatcher = new ConfigurationList<BaseScriptPageConfiguration, BaseScriptPageConfiguration.Property>.
ConfigurationWatcher(null);
_ConfigurationWatcher.ChildWatchers.Add(_BaseScriptPageListWatcher);
}
public new QuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property> CreateQuerySettings()
{
return new HierarchicalQuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property, BaseScriptQueryChildrenSettings>();
}
}
当我进行此调用时,它进入ConfigurationList.CreateQuerySettings方法
如何隐藏
CreateQuerySettings
方法,以便在从BaseScriptConfigurationList
类调用它时,得到一个hierarchycalquerysettings
对象?新的修饰符可以是beasty。请注意,在您的示例中,您是隐藏而不是覆盖。您没有显示代码的这一部分,但我假设您有以下情况:
class Base
{
public static void BaseMethod() { Console.WriteLine("BASE!"); }
}
class Derived : Base
{
// Hides Base.BaseMethod()
new public static void BaseMethod() { Console.WriteLine("DERIVED!"); }
}
Base a = new Base();
a.BaseMethod(); // -> "BASE!"
Base b = new Derived();
b.BaseMethod(); // -> "BASE!"
Derived b = new Derived();
b.BaseMethod(); // -> "DERIVED!"
在BaseScriptConfigurationList.CreateQuerySettings()中
您的返回类型是QuerySettings
,因此您将始终获得该类型作为返回值,但您返回的是层次结构QuerySettings
。您可以将CreateQuerySettings()
的返回类型更改为HierarchicalQuerySettings
或两个,将对象强制转换为其子类型“HierarchicalQuerySettings
”。如果确实要隐藏它,可以执行以下操作:
public class newclass : BaseScriptConfigurationList
{
public new HierarchicalQuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property> CreateQuerySettings()
{
return (HierarchicalQuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property>)base.CreateQuerySettings();
}
}
注意:我假设您的架构大致设置如下:
public abstract class ConfigurationList<TConfigurationObject, TPropertyEnum>
{
public QuerySettings<TConfigurationObject, TPropertyEnum> CreateQuerySettings()
{
return new QuerySettings<TConfigurationObject, TPropertyEnum>();
}
}
public class TConfigurationObjectList : ConfigurationList<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
}
public class EditableConfigurationList<T, T1> : TConfigurationObjectList
{
protected EditableConfigurationList(ConfigurationManager configurationManager, object baseScript)
{
throw new NotImplementedException();
}
}
public class BaseScriptConfigurationList : EditableConfigurationList<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
public BaseScriptConfigurationList(ConfigurationManager configurationManager)
: base(configurationManager, InternalAdminObjectType.BaseScript)
{
}
public new QuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property> CreateQuerySettings()
{
return new HierarchicalQuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property, BaseScriptQueryChildrenSettings>();
}
}
public class QuerySettings<T, T1>
{
}
public class HierarchicalQuerySettings<T, T1, T2> : QuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
}
public class BaseScriptQueryChildrenSettings
{
}
public class BaseScriptPageConfiguration
{
public class Property
{
}
}
public class InternalAdminObjectType
{
public static object BaseScript { get; set; }
}
public class ConfigurationManager
{
}
public class BaseScriptConfiguration
{
public class Property
{
}
}
公共抽象类配置列表
{
公共查询设置CreateQuerySettings()
{
返回新的查询设置();
}
}
公共类TConfigurationObjectList:ConfigurationList
{
}
公共类EditableConfigurationList:TConfigurationObjectList
{
受保护的EditableConfigurationList(ConfigurationManager ConfigurationManager,object baseScript)
{
抛出新的NotImplementedException();
}
}
公共类BaseScriptConfigurationList:EditableConfigurationList
{
public BaseScriptConfigurationList(ConfigurationManager ConfigurationManager)
:base(configurationManager,InternalAdminObjectType.BaseScript)
{
}
公共新查询设置CreateQuerySettings()
{
返回新的HierarchicalQuerySettings();
}
}
公共类查询设置
{
}
公共类层次结构QuerySettings:QuerySettings
{
}
公共类BaseScriptQueryChildrenSettings
{
}
公共类BaseScriptPageConfiguration
{
公共类财产
{
}
}
公共类InternalAdminObjectType
{
公共静态对象BaseScript{get;set;}
}
公共类配置管理器
{
}
公共类BaseScriptConfiguration
{
公共类财产
{
}
}
为ConfigurationList
类创建一个基本接口(比如IConfigurationList
)并使用此接口作为变量cl
的数据类型,而不是TConfigurationList
请提供用于调用create BaseScriptConfigurationList对象的代码,以准确了解遇到的情况。的确,我们在这里看不到全貌--EditableConfigurationList的定义在哪里?另外,“基类”是一个子类这一事实尤其令人困惑。我添加了调用代码来帮助解释发生了什么。@Rachel Martin,更新了您的说明,帮助我了解我们正在断开的连接TConfigurationObjectList
是调用方法的泛型类型。它看起来是这样的:retrieverReferencedObjects(TPropertyEnum idProperty,IEnumerable id)
因此,当我尝试执行var cl=(obj as BaseScriptConfigurationList)时??(t配置对象列表)obj代码>,无法编译。在我上面概述的案例中,TConfigurationObjectList
是BaseScriptConfigurationList
。另外,粗略地说,public abstract class EditableConfigurationList:ConfigurationList
在定义的案例中,您必须将其强制转换到BaseConfigurationList才能访问所需的成员。或者,如果总是该类型,则可以强制转换QuerySettings。如果总是那样的话,就把它扔到Constructor电话上。我会继续,把这个标记为答案。我能够创建一个BaseScriptConfigurationList
来调用CreateQuerySettings
。然后,我可以将querySettings设置为我得到的值。我怀疑问题实际上在于调用构造函数的方式,但我无法修复它。
var obj = typeof(TConfigurationObjectList).GetConstructor(new Type[] { typeof(ConfigurationManager) }).Invoke(new object[] { Manager.ConfigurationManager });
var cl = (obj as BaseScriptConfigurationList) ?? (TConfigurationObjectList)obj;
// or do something else
var querySettings = cl.CreateQuerySettings();
public abstract class ConfigurationList<TConfigurationObject, TPropertyEnum>
{
public QuerySettings<TConfigurationObject, TPropertyEnum> CreateQuerySettings()
{
return new QuerySettings<TConfigurationObject, TPropertyEnum>();
}
}
public class TConfigurationObjectList : ConfigurationList<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
}
public class EditableConfigurationList<T, T1> : TConfigurationObjectList
{
protected EditableConfigurationList(ConfigurationManager configurationManager, object baseScript)
{
throw new NotImplementedException();
}
}
public class BaseScriptConfigurationList : EditableConfigurationList<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
public BaseScriptConfigurationList(ConfigurationManager configurationManager)
: base(configurationManager, InternalAdminObjectType.BaseScript)
{
}
public new QuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property> CreateQuerySettings()
{
return new HierarchicalQuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property, BaseScriptQueryChildrenSettings>();
}
}
public class QuerySettings<T, T1>
{
}
public class HierarchicalQuerySettings<T, T1, T2> : QuerySettings<BaseScriptConfiguration, BaseScriptConfiguration.Property>
{
}
public class BaseScriptQueryChildrenSettings
{
}
public class BaseScriptPageConfiguration
{
public class Property
{
}
}
public class InternalAdminObjectType
{
public static object BaseScript { get; set; }
}
public class ConfigurationManager
{
}
public class BaseScriptConfiguration
{
public class Property
{
}
}