C#•3w ago

Is it possible to update public IReadOnlyList?

There is public IReadOnlyList<ISelectionNode> Selections { get; } from public api I know it is not a good idea but I want to extend it. Is it possible?

4 Replies

Angius•3w ago

With reflections, maybe Get the list normally, turn it into a regular list, append to it Then turn it into a readonly list again and use reflections to change the value of this property to that new list

SWEETPONY•3w ago

hm I tried this:

var newSelections = new List<ISelectionNode>(node.SelectionSet!.Selections) 
{                                                                           
    new FieldNode("test")                                                   
}.AsReadOnly();                                                             
                                                                            
var selectionSetProperty = node.GetType().GetProperty("SelectionSet");      
var selectionSet = selectionSetProperty?.GetValue(node);                    
var selectionsProperty = selectionSet?.GetType().GetProperty("Selections"); 
                                                                            
if(selectionsProperty != null)                                              
{                                                                           
    selectionsProperty.SetValue(selectionSet, newSelections);               
}

var newSelections = new List<ISelectionNode>(node.SelectionSet!.Selections) 
{                                                                           
    new FieldNode("test")                                                   
}.AsReadOnly();                                                             
                                                                            
var selectionSetProperty = node.GetType().GetProperty("SelectionSet");      
var selectionSet = selectionSetProperty?.GetValue(node);                    
var selectionsProperty = selectionSet?.GetType().GetProperty("Selections"); 
                                                                            
if(selectionsProperty != null)                                              
{                                                                           
    selectionsProperty.SetValue(selectionSet, newSelections);               
}

but got an exception "Property set method not found." in the last line

Angius•3w ago

https://stackoverflow.com/questions/3706389/changing-read-only-properties-with-reflection

Stack Overflow

Changing read only properties with reflection

Is it possible? With reflection or any other way?

Angius•3w ago

You need to save the data in the backing field directly selectionProperty.GetBackingField().SetValue(selectionSet, newSelections)

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Programming

Is it possible to update public IReadOnlyList?