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feature: Add winforms auto binding to Tables/Flow based controls #1956

merged 2 commits into from Feb 21, 2019


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glennawatson commented Feb 21, 2019

The following has been added:

  • A interface called ISetMethodBindingConverter which allows the bind engine to perform a custom set operation. This is because WinForms often gives you collections where you are meant to do 'Add' operations directly rather than setting them.
  • Added two new implementations of the ISetMethodBindingConverter. One for general ContentControls, the other for tables.
  • Added a winforms demo based on the main sample.

@glennawatson glennawatson requested review from reactiveui/core-team as code owners Feb 21, 2019


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codecov bot commented Feb 21, 2019

Codecov Report

Merging #1956 into master will decrease coverage by 0.63%.
The diff coverage is 59.25%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #1956      +/-   ##
- Coverage   59.01%   58.38%   -0.64%     
  Files         117      120       +3     
  Lines        4780     4803      +23     
  Branches      678      689      +11     
- Hits         2821     2804      -17     
- Misses       1786     1822      +36     
- Partials      173      177       +4
Impacted Files Coverage Δ
...veUI/Platforms/uap10.0.16299/WinRTAppDataDriver.cs 0% <0%> (ø) ⬆️
...c/ReactiveUI.Winforms/ContentControlBindingHook.cs 0% <0%> (ø)
...rc/ReactiveUI/Bindings/Reactive/ReactiveBinding.cs 75% <0%> (-21.43%) ⬇️
src/ReactiveUI/Expression/Reflection.cs 62.85% <100%> (ø) ⬆️
src/ReactiveUI.Winforms/Registrations.cs 70% <100%> (+7.5%) ⬆️
....Winforms/TableContentSetMethodBindingConverter.cs 8.33% <8.33%> (ø)
...ctiveUI.Winforms/PanelSetMethodBindingConverter.cs 8.33% <8.33%> (ø)
.../Bindings/Property/PropertyBinderImplementation.cs 83.91% <86.76%> (-3.59%) ⬇️
... and 1 more

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gpriaulx left a comment

Looks good; nice simplifications and cleanup.

@glennawatson glennawatson merged commit 2b62d1d into master Feb 21, 2019

3 checks passed

codecov/patch 59.25% of diff hit (target 59.01%)
codecov/project Absolute coverage decreased by -0.63% but relative coverage increased by +0.24% compared to 6a66115
license/cla All CLA requirements met.

@delete-merged-branch delete-merged-branch bot deleted the glennawatson-sample-winforms branch Feb 21, 2019


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axgdev commented Feb 21, 2019

Hi there @glennawatson @gpriaulx! Thank you for the work on ReactiveUI it is great! :)

This commit unfortunately breaks some functionality. If a property value of a binding was null, the framework could (in v9.10.7) cleanly convert it into something appropriate. Example:

this.WhenActivated(disposable =>
    this.WhenAnyValue(x => x.FormText)
        .BindTo(this, x => x.Text)

Please note that this refers to a Form. If for some reason the property FormText is null then an exception is thrown like:

PropertyBinderImplementation: x.Text Binding received an Exception!: System.NullReferenceException: Object reference not set to an instance of an object.
   at ReactiveUI.PropertyBinderImplementation.<>c__DisplayClass10_0`3.<BindToDirect>g__SetThenGet|0(Object paramTarget, Object paramValue, Object[] paramParams) in somepath\src\ReactiveUI\Bindings\Property\PropertyBinderImplementation.cs:line 459
   at ReactiveUI.PropertyBinderImplementation.<>c__DisplayClass10_0`3.<BindToDirect>b__1(TObs x) in somepath\src\ReactiveUI\Bindings\Property\PropertyBinderImplementation.cs:line 475
   at System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value) in somepath\src\System.Reactive\Linq\Observable\Select.cs:line 39

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glennawatson commented Feb 21, 2019

It's worth probably taking this sort of feedback straight to an issue btw. Closed PR's have a habit of getting lost. Moved it over to one ;)

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