RE: PropertyGrid dynamic Dropdown List

Hi Phcmi,

I agree to what Nicolas has suggested.

When we override the methods, such as ConvertTo, ConvertFrom,
GetStandardValues and etc, in the derived TypeConverter class, we could get
the object that is connected with the type descriptor request through the
ITypeDescriptorContext parameter of the methods. So we could add a property
for the dynamic drop down list in the myProp class and then request it
later in the derived TypeConverter class.

The following is a sample. It requires that you add a PropertyGrid control
on the form in advance.

using System.ComponentModel;
using System.Drawing.Design;

public partial class Form1 : Form
{
public class myProp
{
string myStr;

[TypeConverter(typeof(MyConverter))]
public string MyItem
{
get { return myStr; }
set { myStr = value; }
}

List<string> list;

[Browsable(false)]
public List<string> MyList
{
get
{
if (list == null)
{
list = new List<string>();
list.Add("aaa");
list.Add("bbb");
list.Add("ccc");
}
return list;
}
}

}

private void Form1_Load(object sender, EventArgs e)
{
myProp obj = new myProp();
this.propertyGrid1.SelectedObject = obj;
}

}

class MyConverter : TypeConverter
{
public override bool
GetStandardValuesSupported(ITypeDescriptorContext context)
{
return true;
}
public override StandardValuesCollection
GetStandardValues(ITypeDescriptorContext context)
{
List<string> list = (context.Instance as Form1.myProp).MyList;
StandardValuesCollection cols = new
StandardValuesCollection(list);
return cols;
}
}

Hope this helps.
If you have any question, please feel free to let me know.


Sincerely,
Linda Liu
Microsoft Online Community Support

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