Question

this中的WPF事件循环对FSI来说仍然是一个好的（除了rethrow，现在是reraise）？答案是从2008年开始，我不确定是否有任何“更好”的实施。如果不是，那会是什么？

我的understanding是默认实现是针对WinForms。

Answer 1

是的默认是Winforms，我确实使用了很多WpfEventLoop，代码在下面，

#I "c:/Program Files/Reference Assemblies/Microsoft/Framework/v3.0"
#I "C:/WINDOWS/Microsoft.NET/Framework/v3.0/WPF/"
#r "PresentationCore.dll"
#r "PresentationFramework.dll"
#r "WindowsBase.dll"

module WPFEventLoop =     
    open System    
    open System.Windows    
    open System.Windows.Threading    
    open Microsoft.FSharp.Compiler.Interactive    
    open Microsoft.FSharp.Compiler.Interactive.Settings    

    type RunDelegate<'b> = delegate of unit -> 'b     
    let Create() =         
        let app  =             
            try                 
                // Ensure the current application exists. This may fail, if it already does.                
                let app = new Application() in                 
                // Create a dummy window to act as the main window for the application.                
                // Because we're in FSI we never want to clean this up.                
                new Window() |> ignore;                 
                app              
            with :? InvalidOperationException -> Application.Current        
        let disp = app.Dispatcher        
        let restart = ref false        
        { new IEventLoop with             
            member x.Run() =                    
                app.Run() |> ignore                 
                !restart             

            member x.Invoke(f) =                  
                try 
                    disp.Invoke(DispatcherPriority.Send,new RunDelegate<_>(fun () -> box(f ()))) |> unbox                 
                with e -> eprintf "\n\n ERROR: %O\n" e; reraise()             

            member x.ScheduleRestart() =   ()                 
            //restart := true;                 
            //app.Shutdown()        
         }     

    let Install() = fsi.EventLoop <-  Create()

WPFEventLoop.Install()

测试代码

open System
open System.Windows
open System.Windows.Controls

let window = new Window(Title = "Simple Test", Width = 800., Height = 600.)
window.Show()

let textBox = new TextBox(Text = "F# is fun")
window.Content <- textBox

如果有帮助，请告诉我。

-Fahad

FSI WPF事件循环

1 个答案: