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TypeConverter Questiona property whose type is Control. I've written a custom TypeConverter for it that is supposed to present the ID's of all the sited controls on the page. It works, too, until you try to run the project, or until you close the web form, and reopen it in the designer, at which point, if I look at the the items in the collectin, the Control property will be blank, even though my designer class properly rendered the property to html. Here's my converter. Any ideas? Thanks in advance. public class RequiredControlListTypeConverter : TypeConverter { public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return true; } public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(string)) return true; return base.CanConvertTo (context, destinationType); } public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType) { if (destinationType == typeof(string) && value is Control) return (value as Control).ID; return base.ConvertTo (context, culture, value, destinationType); } public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) return true; return base.CanConvertFrom (context, sourceType); } public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) { if (context != null) { if (value is string) { IDesignerHost host = (IDesignerHost)context.GetService(typeof(IDesignerHost)); IReferenceService svc = (IReferenceService)host.GetService(typeof(IReferenceService)); return svc.GetReference((string)value); } return base.ConvertFrom(context, culture, value); } // if (context != null) else return null; } public override System.ComponentModel.TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { IDesignerHost host = (IDesignerHost)context.GetService(typeof(IDesignerHost)); Page page = (Page)host.RootComponent; StringCollection ctrlIDs = new StringCollection(); FindControls(page.Controls, ctrlIDs); return new StandardValuesCollection(ctrlIDs); } protected void FindControls(ControlCollection ctrls, StringCollection ctrlIDs) { foreach(Control ctrl in ctrls) { if (ctrl.HasControls()) FindControls(ctrl.Controls, ctrlIDs); if (TypeDescriptor.GetAttributes(ctrl)[typeof(ValidationPropertyAttribute)] != null) ctrlIDs.Add(ctrl.UniqueID); } } } Hi,
can you also show how you have implemented the property? Show quoteHide quote "Jamie Nordmeyer" <jamie.nordme***@mben.com> wrote in message news:%23vEM5MvEGHA.916@TK2MSFTNGP10.phx.gbl... > Hi all. I have a WebControl that has a collection class of objects who > have a property whose type is Control. I've written a custom > TypeConverter for it that is supposed to present the ID's of all the sited > controls on the page. It works, too, until you try to run the project, or > until you close the web form, and reopen it in the designer, at which > point, if I look at the the items in the collectin, the Control property > will be blank, even though my designer class properly rendered the > property to html. Here's my converter. Any ideas? Thanks in advance. > > public class RequiredControlListTypeConverter : TypeConverter > > { > > public override bool GetStandardValuesSupported(ITypeDescriptorContext > context) > > { > > return true; > > } > > public override bool GetStandardValuesExclusive(ITypeDescriptorContext > context) > > { > > return true; > > } > > public override bool CanConvertTo(ITypeDescriptorContext context, Type > destinationType) > > { > > if (destinationType == typeof(string)) > > return true; > > return base.CanConvertTo (context, destinationType); > > } > > public override object ConvertTo(ITypeDescriptorContext context, > System.Globalization.CultureInfo culture, object value, Type > destinationType) > > { > > if (destinationType == typeof(string) && value is Control) > > return (value as Control).ID; > > return base.ConvertTo (context, culture, value, destinationType); > > } > > public override bool CanConvertFrom(ITypeDescriptorContext context, > Type sourceType) > > { > > if (sourceType == typeof(string)) > > return true; > > return base.CanConvertFrom (context, sourceType); > > } > > public override object ConvertFrom(ITypeDescriptorContext context, > System.Globalization.CultureInfo culture, object value) > > { > > if (context != null) > > { > > if (value is string) > > { > > IDesignerHost host = > (IDesignerHost)context.GetService(typeof(IDesignerHost)); > > IReferenceService svc = > (IReferenceService)host.GetService(typeof(IReferenceService)); > > return svc.GetReference((string)value); > > } > > return base.ConvertFrom(context, culture, value); > > } // if (context != null) > > else > > return null; > > } > > public override > System.ComponentModel.TypeConverter.StandardValuesCollection > GetStandardValues(ITypeDescriptorContext context) > > { > > IDesignerHost host = > (IDesignerHost)context.GetService(typeof(IDesignerHost)); > > Page page = (Page)host.RootComponent; > > StringCollection ctrlIDs = new StringCollection(); > > FindControls(page.Controls, ctrlIDs); > > return new StandardValuesCollection(ctrlIDs); > > } > > protected void FindControls(ControlCollection ctrls, StringCollection > ctrlIDs) > > { > > foreach(Control ctrl in ctrls) > > { > > if (ctrl.HasControls()) > > FindControls(ctrl.Controls, ctrlIDs); > > if > (TypeDescriptor.GetAttributes(ctrl)[typeof(ValidationPropertyAttribute)] > != null) > > ctrlIDs.Add(ctrl.UniqueID); > > } > > } > > } > > Sure. Here ya be:
[Description("Sets or gets the control that will be validated.")] [Category("Condition"), DefaultValue(null)] [TypeConverter(typeof(RequiredControlListTypeConverter))] public Control ControlToValidate { get {return m_ControlToValidate;} set { if (m_ControlToValidate != value) { m_ControlToValidate = value; OnControlToValidateChanged(EventArgs.Empty); } } } Show quoteHide quote "Teemu Keiski" <jot***@aspalliance.com> wrote in message news:ugflAS2EGHA.3576@TK2MSFTNGP10.phx.gbl... > Hi, > > can you also show how you have implemented the property? > > -- > Teemu Keiski > ASP.NET MVP, AspInsider > Finland, EU > http://blogs.aspadvice.com/joteke > > "Jamie Nordmeyer" <jamie.nordme***@mben.com> wrote in message > news:%23vEM5MvEGHA.916@TK2MSFTNGP10.phx.gbl... >> Hi all. I have a WebControl that has a collection class of objects who >> have a property whose type is Control. I've written a custom >> TypeConverter for it that is supposed to present the ID's of all the >> sited controls on the page. It works, too, until you try to run the >> project, or until you close the web form, and reopen it in the designer, >> at which point, if I look at the the items in the collectin, the Control >> property will be blank, even though my designer class properly rendered >> the property to html. Here's my converter. Any ideas? Thanks in >> advance. >> >> public class RequiredControlListTypeConverter : TypeConverter >> >> { >> >> public override bool GetStandardValuesSupported(ITypeDescriptorContext >> context) >> >> { >> >> return true; >> >> } >> >> public override bool GetStandardValuesExclusive(ITypeDescriptorContext >> context) >> >> { >> >> return true; >> >> } >> >> public override bool CanConvertTo(ITypeDescriptorContext context, Type >> destinationType) >> >> { >> >> if (destinationType == typeof(string)) >> >> return true; >> >> return base.CanConvertTo (context, destinationType); >> >> } >> >> public override object ConvertTo(ITypeDescriptorContext context, >> System.Globalization.CultureInfo culture, object value, Type >> destinationType) >> >> { >> >> if (destinationType == typeof(string) && value is Control) >> >> return (value as Control).ID; >> >> return base.ConvertTo (context, culture, value, destinationType); >> >> } >> >> public override bool CanConvertFrom(ITypeDescriptorContext context, >> Type sourceType) >> >> { >> >> if (sourceType == typeof(string)) >> >> return true; >> >> return base.CanConvertFrom (context, sourceType); >> >> } >> >> public override object ConvertFrom(ITypeDescriptorContext context, >> System.Globalization.CultureInfo culture, object value) >> >> { >> >> if (context != null) >> >> { >> >> if (value is string) >> >> { >> >> IDesignerHost host = >> (IDesignerHost)context.GetService(typeof(IDesignerHost)); >> >> IReferenceService svc = >> (IReferenceService)host.GetService(typeof(IReferenceService)); >> >> return svc.GetReference((string)value); >> >> } >> >> return base.ConvertFrom(context, culture, value); >> >> } // if (context != null) >> >> else >> >> return null; >> >> } >> >> public override >> System.ComponentModel.TypeConverter.StandardValuesCollection >> GetStandardValues(ITypeDescriptorContext context) >> >> { >> >> IDesignerHost host = >> (IDesignerHost)context.GetService(typeof(IDesignerHost)); >> >> Page page = (Page)host.RootComponent; >> >> StringCollection ctrlIDs = new StringCollection(); >> >> FindControls(page.Controls, ctrlIDs); >> >> return new StandardValuesCollection(ctrlIDs); >> >> } >> >> protected void FindControls(ControlCollection ctrls, StringCollection >> ctrlIDs) >> >> { >> >> foreach(Control ctrl in ctrls) >> >> { >> >> if (ctrl.HasControls()) >> >> FindControls(ctrl.Controls, ctrlIDs); >> >> if >> (TypeDescriptor.GetAttributes(ctrl)[typeof(ValidationPropertyAttribute)] >> != null) >> >> ctrlIDs.Add(ctrl.UniqueID); >> >> } >> >> } >> >> } >> >> > > 
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