Re: TypeConverter's do not work

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From: Frank Hileman (frankhil_at_no.spamming.prodigesoftware.com)
Date: 02/28/04

  • Next message: Spencer Quinn: "Re: DynamicProperties connection string not working in inherited form in design mode" 
    Date: Sat, 28 Feb 2004 15:07:35 -0800

    There is no matching constructor in Unit. You will need one with a string
    arg. But why the message boxes don't show up -- I suppose b/c it sees there
    is no constructor, so it doesn't bother with TypeConverter.

    Regards,
    Frank

    "Niki Estner" <niki.estner@cube.net> wrote in message
    news:eowGW2k$DHA.1288@TK2MSFTNGP10.phx.gbl...
    > Hi Frank,
    >
    > The code is more or less copied from the MSDN, so it's probably rather
    > boring to you.
    > I didn't post my control, since it is rather:
    > - it uses the System.Windows.Forms.Design.ControlDesigner
    > - it contains a "Unit" property and a collection containing "Unit"'s
    > - the message boxes in the UnitTypeConverter never show
    > I think DevStudio doesn't know what TypeConverter to use for my "Unit"
    > class, but I thought the "TypeConverter" attribute would do that?
    >
    > Niki
    >
    > Code:
    >
    > using System.ComponentModel;
    > using System.ComponentModel.Design;
    > using System;
    > using System.Globalization;
    > using System.ComponentModel.Design.Serialization;
    > using System.Windows.Forms;
    >
    > namespace Test
    > {
    > [TypeConverter(typeof(Test.UnitTypeConverter)), Serializable()]
    > public class Unit
    > {
    > private string name;
    > public string DisplayName { get { return name; } set { name = value; } }
    > }
    >
    > public class UnitTypeConverter : TypeConverter
    > {
    > public UnitTypeConverter()
    > {
    > MessageBox.Show("Test0");
    > }
    > public override bool CanConvertTo(ITypeDescriptorContext context, Type
    > destinationType)
    > {
    > MessageBox.Show("Test1");
    > if (destinationType == typeof(InstanceDescriptor))
    > return true;
    > return base.CanConvertTo(context, destinationType);
    > }
    > public override object ConvertTo(ITypeDescriptorContext context,
    > CultureInfo culture, object value, Type destinationType)
    > {
    > MessageBox.Show("Test2");
    > if (destinationType == typeof(InstanceDescriptor) && value is Unit)
    > {
    > Unit u = (Unit)value;
    > System.Reflection.ConstructorInfo ctor = typeof(Unit).GetConstructor(new
    > Type[] {typeof(string)});
    > if (ctor != null)
    > return new InstanceDescriptor(ctor, new object[] {u.DisplayName});
    > }
    > return base.ConvertTo(context, culture, value, destinationType);
    > }
    > }
    > }
    >
    >
    > "Frank Hileman" <frankhil@no.spamming.prodigesoftware.com> schrieb im
    > Newsbeitrag news:%2335bJsY$DHA.4072@tk2msftngp13.phx.gbl...
    > > Hello Niki,
    > >
    > > Every time I had this problem, it was due to a lack of a typeconverter.
    Or
    > > the typeconverter might be incorrect. Try closing visual studio, all
    > > instances, and restarting. If that doesn't help, post your converter.
    > >
    > > Regards,
    > > Frank Hileman
    > >
    > > check out VG.net: www.vgdotnet.com
    > > Animated vector graphics system
    > > Integrated VS.net graphics editor
    > >
    > > "Niki Estner" <niki.estner@cube.net> wrote in message
    > > news:uYzTELY$DHA.2516@TK2MSFTNGP11.phx.gbl...
    > > > Hi there,
    > > >
    > > > I have a control that contains a collection of custom objects. I'd
    like
    > > them
    > > > to be code-serialized like this:
    > > > myControl.myCollection.AddRange(new MyType[] { ... });
    > > > But I always get code like this:
    > > >
    > > >
    > >
    >
    this.myControl.myCollection.Add(((MyType)(resources.GetObject("resource"))))
    > > > ;
    > > >
    > > >
    > >
    >
    this.myControl.myCollection.Add(((MyType)(resources.GetObject("resource1")))
    > > > );
    > > >
    > > > My custom class "MyType" has the "Serializable" attribute, and a
    > > > "TypeConverter" attribute.
    > > > I've tried inserting a MessageBox.Show into the type converter, it
    isn't
    > > > even created.
    > > >
    > > > I know this question has been posted before.
    > > > I have read the answers
    > > > They do not work.
    > > > I also found an MSDN article about the topic
    > > >
    > >
    >
    (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/h
    > > > tml/custcodegen.asp)
    > > > The sample code does not work either.
    > > > (Steps to reproduce: compile the "ButtonArraySample" solution; Insert
    a
    > > new
    > > > form, insert a "ButtonArray" control into that form, add some items to
    > the
    > > > "Buttons" collection using the designer - the source code contains
    > > > "resources.GetObject" initializations, instead of constructors)
    > > > Why is this so?
    > > >
    > > > I'm using Visual Studio.net 2003 (Version 7.1.3088)
    > > > .NET Framework 1.1.4322
    > > >
    > > > Any help would be appreciated!
    > > >
    > > > Niki
    > > >
    > > >
    > >
    > >
    >
    >

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