Hello Hugues,
Thank you for writing.
If I understand your requirement correctly, you are trying to create an
ExpandableObjectConverter and assign it to a specific property at run time. For this purpose, you can use the following code snippet:
public Form1()
{
InitializeComponent();
PropertyDescriptor prop = TypeDescriptor.GetProperties(typeof(Item))["Cell"];
TypeConverter tc = prop.Converter;
typeof(PropertyDescriptor).GetField("converter", BindingFlags.NonPublic
| BindingFlags.Instance).SetValue(prop, new MyConverter());
this.radPropertyGrid1.SelectedObject = new Item(123,new Cell(3.7m,4.2m),"test");
}
public class Item
{
public int Id { get; set; }
public Cell Cell { get; set; }
public string Title { get; set; }
public Item(int id, Cell cell, string title)
{
this.Id = id;
this.Cell = cell;
this.Title = title;
}
}
public class Cell
{
public decimal X { get; set; }
public decimal Y { get; set; }
public Cell(decimal x, decimal y)
{
this.X = x;
this.Y = y;
}
}
public class MyConverter:ExpandableObjectConverter
{
public override bool CanConvertTo(ITypeDescriptorContext context,
System.Type destinationType)
{
if (destinationType == typeof(string))
return true;
return base.CanConvertTo(context, destinationType);
}
public override object ConvertTo(ITypeDescriptorContext context,
CultureInfo culture,
object value,
System.Type destinationType)
{
Cell cell = value as Cell;
if (destinationType == typeof(System.String) &&
value != null)
{
return ("X: " + cell.X + " Y: " + cell.Y);
}
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, CultureInfo culture, object value)
{
string[] tokens = (value + "").Split(new string[] { "X: ", "Y: " }, StringSplitOptions.RemoveEmptyEntries) ;
if (tokens.Length == 2)
{
decimal x;
decimal y;
if (decimal.TryParse(tokens[0], out x) &&
decimal.TryParse(tokens[1], out y))
{
return new Cell(x,y);
}
}
return base.ConvertFrom(context, culture, value);
}
}
If it is not the exact case, I would kindly ask you to provide a more detailed explanation about the behavior that you are trying to achieve. Thank you in advance.
I hope this information helps. Should you have further questions, I would be glad to help.
Regards,
Desislava
Telerik
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