Improve the DataContext type mismatch error message #1892
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This functionality is essential for server-side only rendering, but this patch is only the groundwork - we still need to add support to Repeater and possibly other controls. The design is fairly simple - we allow resource binding in data context and track that this data context does not exist client-side (see the new ServerSideOnly property). Using this server-only data context is not allowed in value and staticCommand bindings. Note that using a value binding inside the resource-bound control is allowed, it just cannot reference `_this`. Since the context does not exist client-side, we then translate _parent into $data instead of $parent.
* ExpectedType property can now be null, when the assigned property is unknwon:
- this means that CreateBinding will actually create a strongly
typed instance, instead of just ValueBindingExpression<object> or similar
* AutoUI uses props.Property instead of CreateValueBinding where possible
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