访问类出现错误?

[iclife]

System.Web.UI.WebControls.WebControl”的限定符访问保护成员“System.Web.UI.WebControls.WebControl.WebControl()”；限定符必须是类型“MetaBuilders.WebControls.ComboBox”(或者从该类型派生)的

怎么解决?
部分代码如下:

namespace MetaBuilders.WebControls
{

[
Designer(typeof(MetaBuilders.WebControls.ComboBoxDesigner)),//实现设计需要服务类
ValidationProperty("Text"), //标识元素属性的类
]
public class ComboBox : System.Web.UI.WebControls.ListControl, IPostBackDataHandler, INamingContainer
{

public ComboBox() : base() {}
..................
.............


private WebControl container;
private WebControl button;
private TextBox text;
........

protected override void CreateChildControls()
{
container = new WebControl(); //出现错误
container.ID="container";
this.Controls.Add( container );

text = new TextBox();
text.ID = "Text";
text.Attributes["autocomplete"] = "off";
container.Controls.Add( text );
text.TextChanged += new EventHandler( this.raiseTextChanged );

button = new WebControl(); //出现错误
button.ID = "Button";
container.Controls.Add( button );
}
怎么解决?

[iclife]

MSDN上提示这样,.
// CS1540.cs
public class Base
{
protected void func()
{
}
}

public class Derived : Base
{
public static void test(Base anotherInstance)
// the method declaration could be changed as follows
// public static void test(Derived anotherInstance)
{
anotherInstance.func(); // CS1540
}
}

public class Tester : Derived
{
public static void Main()
{
Base pBase = new Base();
// the allocation could be changed as follows
// Derived pBase = new Derived();
test(pBase);
}
}

[iclife]

虽然派生的 class 可以访问其基类的受保护成员，但它无法通过基类的实例这样做。
倒了

[iclife]

孟子 人呢>帮看下,啊

[magicmaster]

初始化 WebControl 类的新实例。

重载列表
初始化表示 Span HTML 标记的 WebControl 类的新实例。

[Visual Basic] Protected Sub New()
[C#] protected WebControl();
[C++] protected: WebControl();
[JScript] protected function WebControl();
使用指定的 HTML 标记初始化 WebControl 类的新实例。

[Visual Basic] Public Sub New(HtmlTextWriterTag)
[C#] public WebControl(HtmlTextWriterTag);
[C++] public: WebControl(HtmlTextWriterTag);
[JScript] public function WebControl(HtmlTextWriterTag);
使用指定的 HTML 标记初始化 WebControl 类的新实例。

[Visual Basic] Protected Sub New(String)
[C#] protected WebControl(string);
[C++] protected: WebControl(String*);
[JScript] protected function WebControl(String);

[iclife]

楼上先感谢感谢!
具体问题是怎么办?

[犀牛老爹]

jf

[我爱程序]

更改成container = new WebControl(HtmlTextWriterTag.Div);就可以了