属性设置器中的线程

发布于 2024-12-12 10:05:58 字数 697 浏览 0 评论 0原文

我有两个属性。第一个是整数属性，这是一个 ID。第二个是一个String，它对应于ID。当我设置ID时，我会在单独的线程中设置相应的字符串属性。代码片段是：

public int FirstPlaceId 
{
    set 
    {
        firstPlaceId = value;
        setPlaceNameDelegate d = new setPlaceNameDelegate( setPlaceName );
        IAsyncResult iar = d.BeginInvoke( value, null, null );
        FirstPlace = d.EndInvoke( iar );
    }
    get { return firstPlaceId; } 
}

public string FirstPlace { set; get; }

private string setPlaceName(int id) 
{
    return "alma"; 
}

delegate String setPlaceNameDelegate( int id );

methodus() 
{
   FirstPlaceId = 5; 
}

我认为看起来不错。但在运行时，当我向 FirstPlaceId 属性分配某个值 (5) 时，会发生 NotSupportedException 错误。为什么以及解决方案是什么？谢谢

原文

I have two properties. The first one is an integer property, this is an ID. The second one is a String, it's corresponding to the ID.
When I set the ID, I will set the correspondent string property in a separate thread.
The code snipet is:

public int FirstPlaceId 
{
    set 
    {
        firstPlaceId = value;
        setPlaceNameDelegate d = new setPlaceNameDelegate( setPlaceName );
        IAsyncResult iar = d.BeginInvoke( value, null, null );
        FirstPlace = d.EndInvoke( iar );
    }
    get { return firstPlaceId; } 
}

public string FirstPlace { set; get; }

private string setPlaceName(int id) 
{
    return "alma"; 
}

delegate String setPlaceNameDelegate( int id );

methodus() 
{
   FirstPlaceId = 5; 
}

I think it looks like ok. But in runtime when I assign some value (5) to the FirstPlaceId property, the NotSupportedException error occurs.
Why and what is the solution?
Thx

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淤浪 2024-12-19 10:05:58

我无法重现你的问题。您使用的是哪个 .NET 框架？

话虽如此，我没有看到在示例代码中使用 BeginInvoke/threading 的好处，因为它将立即等待委托调用完成（使用 EndInvoke）。该属性只会阻塞，并且在功能上与此属性相同：

public int FirstPlaceId
{
    set 
    {
        firstPlaceId = value;
        FirstPlace = setPlaceName(value);
    }
    get { return firstPlaceId; }
}

只需删除 BeginInvoke。

I can't reproduce your issue. Which .NET Framework are you using?

With that said, I don't see the benefit of using BeginInvoke/threading in your sample code since it will immediately wait for the delegate call to complete (with EndInvoke). That property will just block and is functionally the same this one:

public int FirstPlaceId
{
    set 
    {
        firstPlaceId = value;
        FirstPlace = setPlaceName(value);
    }
    get { return firstPlaceId; }
}

Just remove BeginInvoke.

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莫相离 2024-12-19 10:05:58

public void SetFirstPlaceId(int value)
{
    firstPlaceId = value;
    Thread t = new Thread(delegate()
    {
        FirstPlace = setPlaceName(1);
    });
    t.IsBackground = true;
    t.Start();
}

编辑：修复代码以实际启动线程。

通过这个修改，它对我来说效果很好。
（我不是 C# 专家，所以我不确定，但我猜您的 delegate 不支持 BeginInvoke 和 EndInvoke代码>出于某种原因。）

public void SetFirstPlaceId(int value)
{
    firstPlaceId = value;
    Thread t = new Thread(delegate()
    {
        FirstPlace = setPlaceName(1);
    });
    t.IsBackground = true;
    t.Start();
}

EDIT: code fixed to actually start the Thread.

With this modification it just works fine for me.
(And I'm not a C# expert so I don't know for sure, but I guess that your delegate doesn't support BeginInvoke and EndInvoke for some reason.)

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