C#•2y ago

❔ How to convert from one type to a different type

I am still a week or so old in C# so still learning :). Please be patient if I misunderstand. I am using the Autodesk Revit API to create an Addin. I have a windows form with a list and will update colour if element is selected.

            //ElementId is type
            //selectionList.SelectedItem is a list of string vals and then get current item. Without ToString() its an object.
            string curItem = selectionList.SelectedItem.ToString();
            ElementId curItemId = (ElementId)Enum.Parse(typeof(ElementId), curItem);
            //curItemId error: type provided must be Enum. Parameter Name: Enum Type.

            Autodesk.Revit.DB.Color overrideColor = new Autodesk.Revit.DB.Color(52, 235, 85);
            updateSequenceInOrderedSelect.OverrideColour(uiapp, curItemId, overrideColor, false);

            //ElementId is type
            //selectionList.SelectedItem is a list of string vals and then get current item. Without ToString() its an object.
            string curItem = selectionList.SelectedItem.ToString();
            ElementId curItemId = (ElementId)Enum.Parse(typeof(ElementId), curItem);
            //curItemId error: type provided must be Enum. Parameter Name: Enum Type.

            Autodesk.Revit.DB.Color overrideColor = new Autodesk.Revit.DB.Color(52, 235, 85);
            updateSequenceInOrderedSelect.OverrideColour(uiapp, curItemId, overrideColor, false);

I need to convert from string to a new type called ElementId as my method after this requires this. How do I do this? I used this as ref: https://stackoverflow.com/questions/60405465/cannot-implicitly-convert-type-string-to-autodesk-revit-bd-displayunittype The list is generated from ElementIds converted to string. I want to use whatever is currently selected, convert from string to ElementId, then override the colour to make it clear to the user which is is selected currently.

5 Replies

undisputed world champions•2y ago

i have no clue about Autodesk Revit, but ElementId doesn't seem to be an enum i'd guess that selectionList.SelectedItem already is a ElementId. you would just have to cast it like this: ElementId curItemId = (ElementId)selectionList.SelectedItem SelectedItem is defined as object so you can put any type in there, with the downside that you have to cast it into the right type when you get the item out again 😉

CuriousOP•2y ago

Ah didn't know you could do it like that, WIll test it out!

CuriousOP•2y ago

CuriousOP•2y ago

Perfect @icebear thanks alot!

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How to convert from one type to a different type