Expression tree with anonymous type created incorrectly #11127
Description
Please provide a succinct description of the issue.
Consider
let src = [0..10].Select(fun n -> {| n = n |}).ToList().AsQueryable()
let q1 = src.Select(fun c -> {| z = c.n; b = c.n |})
printfn "%A" q1.Expression
let q2 = src.Select(fun c -> {| b = c.n; z = c.n |})
printfn "%A" q2.Expression
Provide the steps required to reproduce the problem:
- Run the program
Expected behavior
Both Expression trees passed to Select should call a two argument constructor for the anonymous type directly.
Actual behavior
The first call to Select creates a nested lambda function call using Invoke instead of just passing the arguments to the constructor.
Known workarounds
Putting the fields in the anonymous record in alphabetical order will correct the error.
Related information
This makes EF Core difficult to use with anonymous records.
- Windows 10
- .NET Core 5
- LINQPad