WPF事件循环

Question

这个答案中的WPF事件循环是否仍然是FSI的一个好循环(除了rethrow，现在是reraise)?答案是从2008年开始的，我不确定是否有"更好"的实现。如果不是，会是什么呢?

我的理解是默认实现是为WinForms.

Answer 1

是的，默认是Winforms，我确实使用WpfEventLoop相当多，代码如下，

#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 "nn ERROR: %On" 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。

法赫德