C# Property Grid Pass Constructor Variable

Question

I'm using the C# property grid to add new objects and change settings of a specific object. I need to know how to pass a a variable to the constructor using the Component Model. Reason why is because a parameter is required to correctly define the initial values of the chart object.

List<Chart> charts = new List<Chart>();
[Description("Charts")]
[Category("4. Collection Charts")]
[DisplayName("Charts")]
public List<Chart> _charts
{
    get { return charts; }
    set { charts = value ; }
}




public class Chart
{
    public static string collectionName = "";

     int chartPosition = GetMaxChartIndex(collectionName);
     [Description("Chart posiion in document")]
     [Category("Control Chart Settings")]
     [DisplayName("Chart Position")]
     public int _chartPosition
     {
         get { return chartPosition; }
         set { chartPosition = value; }
     }


    public Chart(string _collectionName)
    {
        collectionName = _collectionName;

    }
}

Simon Mourier · Answer 1 · 2016-07-17T10:46:25.863

What you can do is declare a custom TypeDescriptionProvider for the Chart type, early before you select your object into the PropertyGrid:

...
TypeDescriptor.AddProvider(new ChartDescriptionProvider(), typeof(Chart));
...

And here is the custom provider (you'll need to implement the CreateInstance method):

public class ChartDescriptionProvider : TypeDescriptionProvider
{
    private static TypeDescriptionProvider _baseProvider = TypeDescriptor.GetProvider(typeof(Chart));

    public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
    {
        // TODO: implement this
        return new Chart(...);
    }

    public override IDictionary GetCache(object instance)
    {
        return _baseProvider.GetCache(instance);
    }

    public override ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance)
    {
        return _baseProvider.GetExtendedTypeDescriptor(instance);
    }

    public override string GetFullComponentName(object component)
    {
        return _baseProvider.GetFullComponentName(component);
    }

    public override Type GetReflectionType(Type objectType, object instance)
    {
        return _baseProvider.GetReflectionType(objectType, instance);
    }

    public override Type GetRuntimeType(Type reflectionType)
    {
        return _baseProvider.GetRuntimeType(reflectionType);
    }

    public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
    {
        return _baseProvider.GetTypeDescriptor(objectType, instance);
    }

    public override bool IsSupportedType(Type type)
    {
        return _baseProvider.IsSupportedType(type);
    }
}

Shouldn't `_baseprovider` either not be static or set in a static constructor? — pinkfloydx33, Jul 17 '16 at 09:58
Thanks for posting. I'm not sure if this is going to help. I do not understand the "TypeDescriptor.AddProvider" part. All that I need to do is pass a parameter to the Chart class' constructor when the property grid creates a new Chart object — ceds, Jul 18 '16 at 05:02

C# Property Grid Pass Constructor Variable

1 Answers1