为什么我不能在WebForm中声明UserControl的子元素（属性）？

我有三个类和一个将使用这三个类的用户控件。
以下是课程及其解释：

//provides access to multiple ManagementMethods [Serializable(), ParseChildren(true)] public class ManagementDelegate { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public List Method { get; set; } } //provides access to multiple ManagementParameters and the method name [Serializable(), PersistChildren(false)] public class ManagementMethod { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)] public string Name { get; set; } [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public List Parameter { get; set; } } //describes a parameter of method. [Serializable(), PersistChildren(false)] public class ManagementParameter { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)] public string ParameterName { get; set; } } //=============================== //here is the part of user control code behind that uses the ManagementDelegate class. [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public ManagementDelegate SelectMethods { get; set; } 

所以这是我正在寻找的结构的一个例子：

       </Method  </Method   

问题是ASP.net将SelectMethod识别为内部标记，它甚至将Method标记识别为内部标记，但它不识别实际为ManagementMethod的Method标记的类型。 当我将任何属性的类型更改为简单类型时，例如将List更改为ManagementMethod，ASP.net会识别它并且一切正常。 你也可以使用任何List 对象。

Answer 1

这是我们的生产代码的片段，您可以看到ControlDependency类甚至允许ControlDependency子代

 [PersistChildren(false), TypeConverter(typeof(ExpandableObjectConverter)), ParseChildren(true), Serializable()] public class ControlDependencySetting { [System.ComponentModel.DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Content), PersistenceMode(PersistenceMode.InnerProperty)] public List ControlDependencies { get; set; } ***Code emitted } [PersistChildren(false), TypeConverter(typeof(ExpandableObjectConverter)), ParseChildren(true),Serializable()] public class ControlDependency { [System.ComponentModel.DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Content), PersistenceMode(PersistenceMode.InnerProperty)] public List ControlDependencies { get; set; } **Code Emitted } 

并在自定义控件中声明为

 [System.ComponentModel.DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Content), PersistenceMode(PersistenceMode.InnerProperty), NotifyParentProperty(true)] public List ControlDependencySettings { get; set; } 

另请注意，我确实在每个构造函数中创建了这些列表的实例。

*编辑***

您调用了列表Method和元素Method ，您希望ManagementDelegate子元素自动添加到名为Method的列表中，这不是它的工作原理，当您想要添加到列表时需要指定列表元素并在其中添加，你已经为参数做了同样的事情。

这是您目前的结构所期望的。

   <--Now this is the list of methods, you have also called it method  <-- This is an element of the method type to add to the list you have called Method  <-- This is the list of parameters you have called it Parameter  <--parameter element     

您应该重命名为Methods和Parameters并相应地使用或重新构建您的布局。

就像是

  //provides access to multiple ManagementMethods [Serializable(), ParseChildren(true)] public class ManagementDelegate { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public List Methods { get; set; } } //provides access to multiple ManagementParameters and the method name [Serializable(), PersistChildren(false),TypeConverter(typeof(ExpandableObjectConverter))] public class ManagementMethod { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)] public string Name { get; set; } [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public List Parameters { get; set; } } //describes a parameter of method. [Serializable(), PersistChildren(false),TypeConverter(typeof(ExpandableObjectConverter))] public class ManagementParameter { [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)] public string ParameterName { get; set; } } //=============================== //here is the part of user control code behind that uses the ManagementDelegate class. [Browsable(true), EditorBrowsable(EditorBrowsableState.Always), PersistenceMode(PersistenceMode.InnerProperty)] public ManagementDelegate SelectDelegate { get; set; } 

然后

我相信默认情况下也可能会指出内部属性属于特定属性，请参阅PersistenceMode.InnerDefaultProperty – 但我从未尝试过这个。