Recently, we have run into an issue on several public-facing sites running on DotVVM 4.0+. When navigating between the pages on the site, we started seeing random errors like this:

Although DotVVM 4.3 is still in preview, we have already invested a significant effort into several DotVVM 5.0 features. In this blog series, I’ll briefly share some of the features you can look forward to.

This article is the last part of the series:

This article is the third part of the series:

Static commands are a powerful feature of DotVVM which lets you modify the viewmodel without calling the server. This is possible because DotVVM can translate some C# calls into JavaScript snippets. We don’t involve WebAssembly in this process – the translation is just a simple transform of the C# expression to a JS one, and the list of supported syntax constructs and APIs is limited.

This article is the second part of the series:

This article is the first part of the series:

You may already be aware that DotVVM 4.0 has introduced a new feature called Composite Controls, which provides a new way to write controls in DotVVM. This approach eliminates the need to declare DotVVM properties in code-only controls, for which you had to use the dotprop code snippet and work with long property declaration blocks. Instead, it only requires declaring a `GetContents` method and placing individual control properties as arguments of the method. By using this approach, the control code appears much more attractive and readable.

Building forms is really easy! To put all selected options into a collection, just bind the collection to multiple CheckBox controls.

One of the scenarios in which the new way of building controls in DotVVM – the composite controls – really excel, is when used in combination with Web components.