Application.RemoveMessageFilter(IMessageFilter) 方法
定义
重要
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从应用程序的消息泵移除一个消息筛选器。
public:
static void RemoveMessageFilter(System::Windows::Forms::IMessageFilter ^ value);public static void RemoveMessageFilter (System.Windows.Forms.IMessageFilter value);static member RemoveMessageFilter : System.Windows.Forms.IMessageFilter -> unitPublic Shared Sub RemoveMessageFilter (value As IMessageFilter)参数
- value
- IMessageFilter
要从应用程序移除的 IMessageFilter 的实现。
示例
在使用消息筛选器之前，必须提供接口的 IMessageFilter 实现。 The following class creates a message filter called TestMessageFilter. 此筛选器阻止与鼠标左键相关的所有消息。
// Creates a message filter.
ref class TestMessageFilter: public IMessageFilter
{
public:
[SecurityPermission(SecurityAction::LinkDemand, Flags = SecurityPermissionFlag::UnmanagedCode)]
virtual bool PreFilterMessage( Message % m )
{
// Blocks all the messages relating to the left mouse button.
if ( m.Msg >= 513 && m.Msg <= 515 )
{
Console::WriteLine( "Processing the messages : {0}", m.Msg );
return true;
}
return false;
}
};
// Creates a message filter.
public class TestMessageFilter : IMessageFilter
{
public bool PreFilterMessage(ref Message m)
{
// Blocks all the messages relating to the left mouse button.
if (m.Msg >= 513 && m.Msg <= 515)
{
Console.WriteLine("Processing the messages : " + m.Msg);
return true;
}
return false;
}
}
' Creates a message filter.
<SecurityPermission(SecurityAction.LinkDemand, Flags := SecurityPermissionFlag.UnmanagedCode)> _
Public Class TestMessageFilter
Implements IMessageFilter
<SecurityPermission(SecurityAction.Demand)> _
Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) _
As Boolean Implements IMessageFilter.PreFilterMessage
' Blocks all the messages relating to the left mouse button.
If ((m.Msg >= 513) And (m.Msg <= 515)) Then
Console.WriteLine("Processing the messages : " & m.Msg)
Return True
End If
Return False
End Function
End Class
注解
当不再需要捕获消息Windows消息之前，可以删除消息筛选器。