Persisting programmatically changed (set) property.
Your Windows Forms FAQ inspired me and opened eyes om some problems, helped to solve many Design-time issues.
At the present, I’m desperately trying to solve the problem for (you'd not believe) more than 3 weeks.
I posted the question at many places (Microsoft’s newsgroups – many times, gotdonet.com, codeproject.com, … )
All my posting were left unanswered. There can be a little detail I’m missing.
Below are my class ClickTestControl(significantly simplified ) and its
designer - ClickTestDesigner .
ClickTestControl has a property called "CurrentState". I would like to set
the property programmatically in designer mode.
I'm able to do that, I see the changed value in a property Grid, I see that
OnComponentChanged is called.
However,
this value does not persist in a web form.
This property does persist if I change the property in the property Grid manually.
Any suggestions are greatly appreciated.
Oleg
P.S. for your convenience I also attached my sample solution.
------------
using System;
using System.Drawing ;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using ClickTestControls.Design;
[assembly: TagPrefix ("TestControls", "CLICK")]
namespace TestControls
{
[ ToolboxData("<{0}:ClickTestControl runat=server>"),
Designer(typeof(ClickTestDesigner))]
public class ClickTestControl : Control, INamingContainer
{
private string _currentState;
[ PersistenceMode(PersistenceMode.Attribute),
DesignerSerializationVisibility(DesignerSerializationVisibility.Visible ) ]
public string CurrentState
{
get { return _currentState; }
set { _currentState=value; }
}
protected override void CreateChildControls()
{
Controls.Add (new LiteralControl ("Some dummy Literal"));
}
}
}
// Designer
using System;
using System.Drawing;
using System.Drawing.Design;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;
using TestControls;
namespace ClickTestControls.Design
{
public class ClickTestDesigner : System.Web.UI.Design.ControlDesigner
{
private ClickTestControl thisControl;
public override void Initialize(System.ComponentModel.IComponent component)
{
base.Initialize (component);
thisControl = (ClickTestControl)component;
this.IsDirty = true; // try force saving changes made programmatically
if (thisControl.CurrentState == null || thisControl.CurrentState ==string.Empty )
{
string newValue = "Some Value from somewhere..." ;
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(thisControl);
PropertyDescriptor myProperty = properties.Find("CurrentState",true);
// 2 lines trying to achieve the same goal
if (myProperty != null ) myProperty.SetValue(this.Component,newValue);
thisControl.CurrentState = newValue;
RaiseComponentChanged ((MemberDescriptor)myProperty, null,newValue);
TypeDescriptor.Refresh(this.Component);
}
}
public override String GetDesignTimeHtml()
{
String strHtml = "";
strHtml += "
