In F#, what is the object initializer syntax with a mandatory constructor parameter?
c#, c#-to-f#, f#
Solution
The problem you're having is that `IsReadOnly` has an internal setter.
member IsReadOnly : bool with get, internal set
If you want to set it directly you're going to need to subclass `TopicDescription`.
The constructor syntax you're looking at is perfectly acceptable.
let test = new Microsoft.ServiceBus.Messaging.TopicDescription("", EnableBatchedOperations=true)
compiles just fine for me.
Problem
Let's say there's a class that with one public constructor, which takes one parameter. In addition, there are also multiple public properties I'd like to set. What would be the syntax for that in F#? For instance in C# ``` public class SomeClass { public string SomeProperty { get; set; } public SomeClass(string s) { } } //And associated usage. var sc = new SomeClass("") { SomeProperty = "" }; ``` In F# I can get this done using either the constructor or property setters, but not both at the same time as in C#. For example, the following aren't valid ``` let sc1 = new SomeClass("", SomeProperty = "") let sc2 = new SomeClass(s = "", SomeProperty = "") let sc3 = new SomeClass("")(SomeProperty = "") ``` It looks like I'm missing something, but what? <edit: As pointed out by David, doing it all in F# works, but for some reason, at least for me :), it gets difficult when the class to be used in F# is defined in C#. As for an example on such is TopicDescription (to make up something public enough as for an added example). One can write, for instance ``` let t = new TopicDescription("", IsReadOnly = true) ``` and the corresponding compiler error will be `Method 'set_IsReadOnly' is not accessible from this code location`.