c# - Merge the values of multiple dictionaries into one list -

i want merge values of multiple dictionaries (3 exact) list. current solution uses linq first combine dictionaries , converts values list.

private list<part> allparts() {     return walls.concat(floors)                 .concat(columns)                 .todictionary(kvp => kvp.key, kvp => kvp.value)                 .values                 .tolist(); } 

merging lists first seems redundant. how can improve this?

you can simplify code concatenating dictionaries , selecting values without converting dictionary:

return walls.concat(floors)             .concat(columns)             .select(kvp => kvp.value)             .tolist(); 

it looks shortest , readable solution. can avoid concatenating collections taking values only:

return walls.values             .concat(floors.values)             .concat(columns.values)             .tolist(); 

however, not see readability, maintainability or performance improvements here.

p.s. assumed there no duplicates in dictionaries. code contain duplicated values while todictionary approach throw exceptions on key duplication.