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Persisting programmatically changed (set) property.

Thread ID:





12527 Apr 1,2004 02:47 PM UTC Jun 13,2004 07:27 AM UTC WinForms 1
Tags: FAQ
Oleg Slyusarchuk
Asked On April 1, 2004 02:47 PM UTC

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 += "
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