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Question

System.Web.HttpException: Page.RegisterRequiresPostBack can only be called on controls that implement IPostBackDataHandler.
   at System.Web.UI.Page.RegisterRequiresPostBack(Control control)
   at Infragistics.WebUI.UltraWebChart.UltraChart.Render(HtmlTextWriter output)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
   at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
   at System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
   at System.Web.UI.Page.Render(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)注:WEB的系统,代码中没出错,打开页面的时候出的异常

Answer 1

hdt(倦怠) 
   实现IPostBackDataHandler怎么实现?
  
 

Answer 2

using System;
using System.Web;
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
namespace CustomWebFormsControls {   [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
   public class MyTextBox: Control, IPostBackDataHandler {
          public String Text {
         get {
            return (String) ViewState["Text"];
         }         set {
            ViewState["Text"] = value;
         }
      }      
            public event EventHandler TextChanged;
            public virtual bool LoadPostData(string postDataKey, 
         NameValueCollection postCollection) {         String presentValue = Text;
         String postedValue = postCollection[postDataKey];         if (presentValue == null || !presentValue.Equals(postedValue)) {
            Text = postedValue;
            return true;
         }         return false;
      }      
      public virtual void RaisePostDataChangedEvent() {
         OnTextChanged(EventArgs.Empty);
      }
            protected virtual void OnTextChanged(EventArgs e) {
         if (TextChanged != null)
            TextChanged(this,e);
      }
            protected override void Render(HtmlTextWriter output) {
         output.Write("<INPUT type= text name = "+this.UniqueID
            + " value = " + this.Text + " >");
      }
   }   
}