Beste Methode, um Cross-Threaded Code aufzurufen?

Verwenden ISynchronizeInvoke statt Control. Das ist die Schnittstelle, die Control implementiert mit Invoke/BeginInvoke/EndInvoke/InvokeRequired.

Alternative ist die Verwendung SynchronizationContext.Current - das ist, was BackgroundWorker verwendet, glaube ich.

InformationsquelleAutor der Antwort Jon Skeet

hier ist der VB-code entspricht, um Samuel die Antwort, die ich benutze. beachten Sie, dass ich tatsächlich 2 extensions-Funktionen, aber ich muss zugeben, ich weiß nicht, warum Sie da sind. ich kopierte meine C# version vor Jahren (vielleicht auch von dieser Seite) und es hatte beide Erweiterungsfunktionen, aber warum, verstehe ich nicht. ich habe gerade kopiert es und wie es zu benutzen, und ich die Hälfte verstehen alle, dass geht auf 'unter der Haube' mit diesen komplizierten Funktionen.

#Const System_ComponentModel = True
#Const System_Drawing = False

Option Compare Binary
Option Explicit On
Option Strict On

Imports System.Collections
Imports System.Runtime.CompilerServices ' for Extension() attribute
Imports System.Text
#If System_ComponentModel Then
Imports System.ComponentModel
#End If
#If System_Drawing Then
Imports System.Drawing
#End If

Public Module MyExtensions

    ' other #Region blocks are removed. i use many in my Extensions
    ' module/class. the below code is only the 2 relevant extension
    ' for this 'SafeInvoke' functionality. but i use other regions
    ' such as "String extensions" and "Numeric extensions". i use
    ' the above System_ComponentModel and System_Drawing compiler
    ' directives to include or exclude blocks of code that i want
    ' to either include or exclude in a project, which allows me to
    ' easily compare my code in one project with the same file in
    ' other projects to syncronise new changes across projects.
    ' you can scrap pretty much all the code above,
    ' but i'm giving it here so you see it in the full context.

    #Region "ISynchronizeInvoke extensions"

    #If System_ComponentModel Then

        <Extension()>
        Public Function SafeInvoke(Of T As ISynchronizeInvoke, TResult)(isi As T, callFunction As Func(Of T, TResult)) As TResult
            If (isi.InvokeRequired) Then
                Dim result As IAsyncResult = isi.BeginInvoke(callFunction, New Object() {isi})
                Dim endresult As Object = isi.EndInvoke(result)
                Return DirectCast(endresult, TResult)
            Else
                Return callFunction(isi)
            End If
        End Function

        ''' <summary>
        ''' This can be used in VB with:
        ''' txtMyTextBox.SafeInvoke(Sub(d) d.Text = "This is my new Text value.")
        ''' or:
        ''' txtMyTextBox.SafeInvoke(Sub(d) d.Text = myTextStringVariable)
        ''' </summary>
        ''' <typeparam name="T"></typeparam>
        ''' <param name="isi"></param>
        ''' <param name="callFunction"></param>
        ''' <remarks></remarks>
        <Extension()>
        Public Sub SafeInvoke(Of T As ISynchronizeInvoke)(isi As T, callFunction As Action(Of T))
            If isi.InvokeRequired Then
                isi.BeginInvoke(callFunction, New Object() {isi})
            Else
                callFunction(isi)
            End If
        End Sub

    #End If

    #End Region

    ' other #Region blocks are removed from here too.

End Module

Und die C# - version ist:

#define System_ComponentModel
#undef  System_Drawing

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

#if System_ComponentModel
using System.ComponentModel;
#endif
#if System_Drawing
using System.Drawing;
#endif

namespace MyCompany.Extensions
{
    static partial class MyExtensions
    {

        //other #Region blocks are removed. i use many in my Extensions
        //module/class. the below code is only the 2 relevant extension
        //for this 'SafeInvoke' functionality. but i use other regions
        //such as "String extensions" and "Numeric extensions". i use
        //the above System_ComponentModel and System_Drawing compiler
        //directives to include or exclude blocks of code that i want
        //to either include or exclude in a project, which allows me to
        //easily compare my code in one project with the same file in
        //other projects to syncronise new changes across projects.
        //you can scrap pretty much all the code above,
        //but i'm giving it here so you see it in the full context.

        #region ISynchronizeInvoke extensions
#if System_ComponentModel

        public static TResult SafeInvoke<T, TResult>(this T isi, Func<T, TResult> callFunction) where T : ISynchronizeInvoke
        {
            if (isi.InvokeRequired)
            {
                IAsyncResult result = isi.BeginInvoke(callFunction, new object[] { isi });
                object endResult = isi.EndInvoke(result); return (TResult)endResult;
            }
            else
                return callFunction(isi);
        }

        ///<summary>
        ///This can be used in C# with:
        ///txtMyTextBox.SafeInvoke(d => d.Text = "This is my new Text value.");
        ///or:
        ///txtMyTextBox.SafeInvoke(d => d.Text = myTextStringVariable);
        ///</summary>
        ///<typeparam name="T"></typeparam>
        ///<param name="isi"></param>
        ///<param name="callFunction"></param>
        public static void SafeInvoke<T>(this T isi, Action<T> callFunction) where T : ISynchronizeInvoke
        {
            if (isi.InvokeRequired) isi.BeginInvoke(callFunction, new object[] { isi });
            else
                callFunction(isi);
        }

#endif
        #endregion

        //other #Region blocks are removed from here too.

    } //static class MyExtensions

} //namespace

Happy coding!

InformationsquelleAutor der Antwort Shawn Kovac