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c#多线程更新窗口(winform)GUI的数据

1. 在.net framwork 2.0中,可以通过以下代码来实现:

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private delegate void SetControlPropertyThreadSafeDelegate(Control control, string propertyName, object propertyValue);
public static void SetControlPropertyThreadSafe(Control control, string propertyName, object propertyValue)
{
   if (control.InvokeRequired)
   {
     control.Invoke( new SetControlPropertyThreadSafeDelegate(SetControlPropertyThreadSafe), new object [] { control, propertyName, propertyValue });
   }
   else
   {
     control.GetType().InvokeMember(propertyName, BindingFlags.SetProperty, null , control, new object [] { propertyValue });
   }
}

  调用方式如下:  

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// thread-safe equivalent of
// myLabel.Text = status;
SetControlPropertyThreadSafe(myLabel, "Text" , status);

2.在.net 3.0或者更新的版本中,你可以重写上面的方法作为一个Control类的扩展方法,可以简化调用方式,具体代码如下:  

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myLabel.SetPropertyThreadSafe( "Text" , status);

 在.net 3.0以上的版本完整的调用步骤如下:

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private delegate void SetPropertyThreadSafeDelegate<TResult>(Control @ this , Expression<Func<TResult>> property, TResult value);
public static void SetPropertyThreadSafe<TResult>( this Control @ this , Expression<Func<TResult>> property, TResult value)
{
   var propertyInfo = (property.Body as MemberExpression).Member as PropertyInfo;
   if (propertyInfo == null ||
       !@ this .GetType().IsSubclassOf(propertyInfo.ReflectedType) ||
       @ this .GetType().GetProperty(propertyInfo.Name, propertyInfo.PropertyType) == null )
   {
     throw new ArgumentException( "The lambda expression ‘property‘ must reference a valid property on this Control." );
   }
   if (@ this .InvokeRequired)
   {
     @ this .Invoke( new SetPropertyThreadSafeDelegate<TResult>(SetPropertyThreadSafe), new object [] { @ this , property, value });
   }
   else
   {
     @ this .GetType().InvokeMember(propertyInfo.Name, BindingFlags.SetProperty, null , @ this , new object [] { value });
   }
}

   通过使用LINQ和lambda表达式使代码更加简洁:  

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myLabel.SetPropertyThreadSafe(() => myLabel.Text, status); // status has to be a string or this will fail to compile

3.最简单的匿名方法调用:

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///...blah blah updating files
string newText = "abc" ; // running on worker thread
this .Invoke((MethodInvoker) delegate {
     someLabel.Text = newText; // runs on UI thread
});
///...blah blah more updating files

以上方法搜集自网络,仅供参考。


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本文标题:c#多线程更新窗口(winform)GUI的数据