Question

我有一些不同的方法，每个方法都从不同的网站导入产品。如果我按顺序执行这些操作，整个过程会花费很多时间，尤其是当响应速度较慢的站点上运行1个方法时。

我宁愿同时运行它们。

这是我到目前为止用一个示例方法：

Public Class feedParameters

Private _productIdPrefix As String
Private _publishersite As String
Private _feedURL As String

Public Property productIdPrefix() As String
    Get
        Return _productIdPrefix
    End Get
    Set(value As String)
        _productIdPrefix = value
    End Set
End Property
Public Property publishersite() As String
    Get
        Return _publishersite
    End Get
    Set(value As String)
        _publishersite = value
    End Set
End Property
Public Property feedURL() As String
    Get
        Return _feedURL
    End Get
    Set(value As String)
        _feedURL = value
    End Set
End Property


End Class




Dim fpm As New feedParameters
fpm.publishersite = "mypublisher.nl"
fpm.feedURL = "http://www.domain.com/test.xml"
fpm.productIdPrefix = "10"

Protected Sub ImportProductsPublisherA(ByVal productIdPrefix As String, ByVal publishersite As String, ByVal feedURL As String)

End Sub

我试过了：

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsPublisherA()), fpm)

然后我得到3个错误，我没有为3个参数指定参数：productIdPrefix，publishersite和feedURL

我也尝试过：

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsPublisherA), fpm)

我收到此错误：方法'Protected Sub ImportProductsPublisherA（productIdPrefix As String，publishersite As String，feedURL As String）'没有与委托'Delegate Sub WaitCallback（state As Object）'兼容的签名。

非常感谢任何帮助！

Answer 1

这是WinForms还是asp.net？

如果winforms为每个函数创建一个后台工作程序并启动所有函数，它们将在一个单独的线程中独立工作。

如果您想使用System.Threading.ThreadPool - http://msdn.microsoft.com/en-us/library/system.threading.threadpool.aspx

查看asp.net

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsSiteA))

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsSiteB))

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsSiteC))

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsSiteD))

如果你的函数采用任何参数，你可以像这样传递它们：

System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf ImportProductsSiteA), parameter-here)

Answer 2

using System.Threading.Tasks;

namespace Foo
{
   public class Bar
   {
      public void ImportProductsSiteA() { }
      public void ImportProductsSiteB() { }
      public void ImportProductsSiteC() { }
      public void ImportProductsSiteD() { }

      public void Execute()
      {
         var a = Task.Factory.StartNew(ImportProductsSiteA);
         var b = Task.Factory.StartNew(ImportProductsSiteB);
         var c = Task.Factory.StartNew(ImportProductsSiteC);
         var d = Task.Factory.StartNew(ImportProductsSiteD);
         Task.WaitAll(a, b, c, d);
      }
   }
}

如何同时调用多种不同的方法

2 个答案: