Don't want to have too many unknowns. If you inherit from control, you feel too much of the unknown.
Try 1: Create a normal class library, to be public:
using System;
namespace test1
{
public class Test1
{
}
}
Compiled into a DLL, ready to put on the test ASPX page, the result is not even the toolbox, the error.
View the definition of control, 8 interfaces, first: IComponent
using System;
using System.ComponentModel;
namespace test1
... {
public class test1:icomponent
...{
IComponent members #region IComponent members
public event EventHandler disposed;
Public ISite Site
...{
get
...{
Throw the new Exception ("Themethodor operation isn't Implemented. " );
}
Set
...{
Throw the new Exception ("Themethodor operation isn't Implemented. " );
}
}
#endregion
IDisposable Members #region IDisposable members
public void Dispose ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
}
}
there is no error in the toolbox, but you can't see it. is not "one can not be less"? The 8 have been realized and put again, still invisible. The code that reflects control (the reflection tool reflector the resources I upload to http://download.111cn.net/user/whwqs), discovers the metadata of the control head, Add it to the. You can see it in the toolbox.
using System;
using System.ComponentModel;
using System.Web.UI;
using system.web;
using System.ComponentModel.Design.Serialization;
using System.Security.Permissions;
namespace test1
... {
[Designercategory ("Code"), ToolboxItemFilter ("System.Web.UI", ToolboxItemFilterType.Require), Designerserializer ("Microsoft.VisualStudio.Web.WebForms.ControlCodeDomSerializer, Microsoft.VisualStudio.Web, version=8.0.0.0, Culture=neutral, publickeytoken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, version=2.0.0.0, culture=neutral , publickeytoken=b03f5f7f11d50a3a"), Defaultproperty ("ID"), Designer ("System.Web.UI.Design.ControlDesigner, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), ToolboxItem ("System.Web.UI.Design.WebControlToolboxItem, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), Themeable (false), bindable (true), AspNetHostingPermission (SecurityAction.InheritanceDemand, level=aspnethostingpermissionlevel.minimal), AspNetHostingPermission (SecurityAction.LinkDemand, level= Aspnethostingpermissionlevel.minimal)]
public class Test1:icomponent, IDisposable, IParserAccessor, IUrlResolutionService, Idatabindingsaccessor, Icontrolbuilderaccessor, Icontroldesigneraccessor, Iexpressionsaccessor
...{
IComponent members #region IComponent members
public event EventHandler disposed;
Public ISite Site
...{
get
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Set
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
}
#endregion
IDisposable Members #region IDisposable members
public void Dispose ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
Icontroldesigneraccessor Members #region icontroldesigneraccessor members
Public System.Collections.IDictionary getdesignmodestate ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void setdesignmodestate (System.Collections.IDictionary data)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void Setownercontrol (control owner)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Public System.Collections.IDictionary UserData
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
IParserAccessor Members #region iparseraccessor members
public void addparsedsubobject (object obj)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
IUrlResolutionService Members #region iurlresolutionservice members
public string resolveclienturl (string Relativeurl)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
Idatabindingsaccessor Members #region idatabindingsaccessor members
Public databindingcollection DataBindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasdatabindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Icontrolbuilderaccessor Members #region icontrolbuilderaccessor members
Public ControlBuilder ControlBuilder
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Iexpressionsaccessor Members #region iexpressionsaccessor members
Public expressionbindingcollection Expressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasexpressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
}
}
Drag onto the page, say "no public property with ID", and then look at the definition of control, copy its ID, modify it, and change it to:
using System;
using System.ComponentModel;
using System.Web.UI;
using system.web;
using System.ComponentModel.Design.Serialization;
using System.Security.Permissions;
namespace test1
... {
[Designercategory ("Code"), ToolboxItemFilter ("System.Web.UI", ToolboxItemFilterType.Require), Designerserializer ("Microsoft.VisualStudio.Web.WebForms.ControlCodeDomSerializer, Microsoft.VisualStudio.Web, version=8.0.0.0, Culture=neutral, publickeytoken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, version=2.0.0.0, culture=neutral , publickeytoken=b03f5f7f11d50a3a"), Defaultproperty ("ID"), Designer ("System.Web.UI.Design.ControlDesigner, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), ToolboxItem ("System.Web.UI.Design.WebControlToolboxItem, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), Themeable (false), bindable (true), AspNetHostingPermission (SecurityAction.InheritanceDemand, level=aspnethostingpermissionlevel.minimal), AspNetHostingPermission (SecurityAction.LinkDemand, level= Aspnethostingpermissionlevel.minimal)]
public class Test1:icomponent, IDisposable, IParserAccessor, IUrlResolutionService, Idatabindingsaccessor, Icontrolbuilderaccessor, Icontroldesigneraccessor, Iexpressionsaccessor
...{
string _id = "id1" ;
[Parenthesizepropertyname (true )]
[Filterable (false )]
[Themeable (false )]
[Mergableproperty (false )]
public string ID
...{
set
...{
_id = value;
}
Get
...{
return _id;
}
}
IComponent Members #region IComponent members
public event EventHandler disposed;
Public ISite Site
...{
get
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Set
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
}
#endregion
IDisposable Members #region IDisposable members
public void Dispose ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
Icontroldesigneraccessor Members #region icontroldesigneraccessor members
Public System.Collections.IDictionary getdesignmodestate ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void setdesignmodestate (System.Collections.IDictionary data)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void Setownercontrol (control owner)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Public System.Collections.IDictionary UserData
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
IParserAccessor Members #region iparseraccessor members
public void addparsedsubobject (object obj)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
IUrlResolutionService Members #region iurlresolutionservice members
public string resolveclienturl (string Relativeurl)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
Idatabindingsaccessor Members #region idatabindingsaccessor members
Public databindingcollection DataBindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasdatabindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Icontrolbuilderaccessor Members #region icontrolbuilderaccessor members
Public ControlBuilder ControlBuilder
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Iexpressionsaccessor Members #region iexpressionsaccessor members
Public expressionbindingcollection Expressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasexpressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
}
}
Then drag to the page, report other errors, regardless, in the browser view:
And then to the control of the reflection to find the implementation of the AddParsedSubObject, posted over:
using System;
using System.ComponentModel;
using System.Web.UI;
using system.web;
using System.ComponentModel.Design.Serialization;
using System.Security.Permissions;
namespace test1
... {
[Designercategory ("Code"), ToolboxItemFilter ("System.Web.UI", ToolboxItemFilterType.Require), Designerserializer ("Microsoft.VisualStudio.Web.WebForms.ControlCodeDomSerializer, Microsoft.VisualStudio.Web, version=8.0.0.0, Culture=neutral, publickeytoken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, version=2.0.0.0, culture=neutral , publickeytoken=b03f5f7f11d50a3a"), Defaultproperty ("ID"), Designer ("System.Web.UI.Design.ControlDesigner, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), ToolboxItem ("System.Web.UI.Design.WebControlToolboxItem, System.Design, version=2.0.0.0, Culture=neutral, publickeytoken= B03F5F7F11D50A3A"), Themeable (false), bindable (true), AspNetHostingPermission (SecurityAction.InheritanceDemand, level=aspnethostingpermissionlevel.minimal), AspNetHostingPermission (SecurityAction.LinkDemand, level= Aspnethostingpermissionlevel.minimal)]
public class Test1:icomponent, IDisposable, IParserAccessor, IUrlResolutionService, Idatabindingsaccessor, Icontrolbuilderaccessor, Icontroldesigneraccessor, Iexpressionsaccessor
...{
string _id = "id1" ;
[Parenthesizepropertyname (true )]
[Filterable (false )]
[Themeable (false )]
[Mergableproperty (false )]
public string ID
...{
set
...{
_id = value;
}
Get
...{
return _id;
}
}
IComponent Members #region IComponent members
public event EventHandler disposed;
Public ISite Site
...{
get
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Set
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
}
#endregion
IDisposable Members #region IDisposable members
public void Dispose ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
#endregion
Icontroldesigneraccessor Members #region icontroldesigneraccessor members
Public System.Collections.IDictionary getdesignmodestate ()
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void setdesignmodestate (System.Collections.IDictionary data)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
public void Setownercontrol (control owner)
...{
Throw the new Exception ("Themethodor operation isn't implemented. ");
}
Public System.Collections.IDictionary UserData
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
IParserAccessor Members #region iparseraccessor members
public void addparsedsubobject (object obj)
...{
control Child = obj ascontrol;
if ( child != null )
...{
//this. Controls.Add (child);
}
}
#endregion
IUrlResolutionService Members #region iurlresolutionservice members
public string resolveclienturl (string Relativeurl)
...{
Throw the new Exception ("Themethodor operation isn't Implemented. " );
}
#endregion
Idatabindingsaccessor Members #region idatabindingsaccessor members
Public databindingcollection DataBindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasdatabindings
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Icontrolbuilderaccessor Members #region icontrolbuilderaccessor members
Public ControlBuilder ControlBuilder
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
Iexpressionsaccessor Members #region iexpressionsaccessor members
Public expressionbindingcollection Expressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
public bool Hasexpressions
...{
get ... { throw new Exception ("The" themethodor Operation is not implemented. " ); }
}
#endregion
}
}
Browse again, no more errors. But in the designer still the error, after analysis I think is icontroldesigneraccessor member void Setownercontrol (Control owner) Check MSDN has a word:
This member is an implementation of an explicit interface member. It can only be used when the control instance is cast to the Icontroldesigneraccessor interface. The control designer performs a design-time operation on the control using the Icontroldesigneraccessor interface.
It seems that it must be an instance of control to be displayed correctly in the designer, but my test1 instance. That is, an instance of a class that imitates its implementation cannot always be displayed correctly in the designer without inheriting from control. Unless you copy a designer. But it's also rewarding: the controls that are rendered in the designer are actually corresponding to an instance in memory. Remember this icontroldesigneraccessor interface. The controls we make may need to be well understood if they are presented in a designer with a different design interface.
Next, there is a thought: I ignore the designer, can render my control to the page? The answer is impossible. Because the control you want to render must be added to the control tree. The loading method, for example: the Controls.Add parameter must be control or its descendants. And Test1 is no way to control.
Conclusion: Under 2.0 or previous frameworks, you must inherit from control to develop Web controls.
Recommend an article: explain inheritance from the control inherited from WebControl different.
Http://www.cnblogs.com/mapserver/articles/392325.html
