CODEWITHSUNDEEP
c#windowspropertygrid
Naf
Naf

Reputation: 185

How to reset the default values for the properties of the component in the PropertyGrid?

I have a class with properties as objects any more classes. For example:

    public Class Humans
    {
      public Person Human {get; set;}

      [DefaulValue("New York")]
      public string Sity {get; set;}
    }

    public struct Person
    {
      [DefaulValue("Name")]
      public string Name {get; set;}

      [DefaulValue("Surname")]
      public string Surname {get; set;}
    }

If I want to reset the Humans class, I write this:

    PropertyDescriptorCollection props = TypeDescriptor.GetProperties(Humans);
    foreach (PropertyDescriptor pr in props)
    {
        if (pr.Attributes.OfType<DefaultValueAttribute>().Any())
        {
            pr.ResetValue(obj);
        }
    }

In the case of property, everything happens perfectly Sity, and for properties Human nothing happens. So here's how to reset to the default values ​​of these properties?

Upvotes: 2

Views: 1581

Answers (1)

Marc Gravell
Marc Gravell

Reputation: 1062512

You don't need to check .Attributes. The key here is pr.CanResetValue(obj). If that returns true, you can call pr.ResetValue(obj). If it returns false, you shouldn't try. There are multiple approaches for supporting resets - including:

  • [DefaultValue]
  • void Reset{membername}()
  • a custom PropertyDesciptor

I suggest you try adding:

void ResetHuman() { Human = null; }

Then you should find that pr.CanResetValue(obj) returns true and pr.ResetValue(obj) clears the value.

Upvotes: 1

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