Скачать или смотреть Solving the DataGridView Display Issue in VB.Net: Ensuring Base Class Properties are Visible

Discover how to bind a `DataGridView` to display all properties, including those of the base class, when working in VB.Net.
---
This video is based on the question https://stackoverflow.com/q/64932610/ asked by the user 'Pepa Zdepa' ( https://stackoverflow.com/u/13243424/ ) and on the answer https://stackoverflow.com/a/64934038/ provided by the user 'Pepa Zdepa' ( https://stackoverflow.com/u/13243424/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: (VB.Net) BaseClass properties aren't displayed in DataGridView when data-binding

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Solving the DataGridView Display Issue in VB.Net: Ensuring Base Class Properties are Visible

When working with data binding in VB.Net, it's common to encounter issues where not all desired properties of a class are displayed in a DataGridView. This can be particularly frustrating when you're binding a list of derived class objects and can only see properties specific to that derived class. In this post, we'll explore the problem of DataGridView not showing base class properties and provide a straightforward solution.

The Problem: Missing Base Class Properties

Imagine you have a hierarchy of classes where a BaseClass contains essential properties like Name, Details, and Day. A DerivedClass adds additional properties, but when binding a list of DerivedClass objects to a DataGridView, you're only able to see the properties of DerivedClass, excluding those inherited from BaseClass. Here's a simplified version of the classes in question:

[[See Video to Reveal this Text or Code Snippet]]

When executing the following binding code:

[[See Video to Reveal this Text or Code Snippet]]

You will only see the Graf property in the DataGridView, leaving out Name, Details, and Day. So, how do we ensure that all properties are visible?

The Solution: Changing List Type in Binding

As it turns out, the underlying issue stems from how the list is defined. The type of the list used for data binding directly impacts what properties are displayed in the DataGridView. In the initial implementation, the list type was defined as ISample, leading to limited visibility of properties.

Step-by-step Solution:

Change the List Type: Modify the type of your list from ISample to the concrete implementation, which in this case is Sample.

[[See Video to Reveal this Text or Code Snippet]]

Update your Main Method: Ensure your binding looks like this, using the correctly typed list:

[[See Video to Reveal this Text or Code Snippet]]

By making this change, you're ensuring that the DataGridView can now access all properties exposed by the base class, along with those of the derived class.

Conclusion

This issue is a classic example in VB.Net data binding where understanding class hierarchy and type definitions can solve visibility problems in DataGridView. As we've seen, changing the list type from the interface to a concrete class implementation can unlock the full range of properties available for display.

Remember, when working with class hierarchies and data binding, the type used for your collections is crucial. Happy coding!