加速将rtf转换为纯文本

我必须将以RTF格式保存在数据库中的大量文本更改为纯文本.我正在使用described in this MSDN article方法,但是我想我发现了一个障碍(我不认为这是在我的代码中,而是.NET框架本身).

我有以下功能

    //convert RTF text to plain text
    public static string RtfTextToPlainText(string FormatObject)
    {
        System.Windows.Forms.RichTextBox rtfBox = new System.Windows.Forms.RichTextBox();
        rtfBox.Rtf = FormatObject;
        FormatObject = rtfBox.Text; //This is line 494 for later reference for the stack traces.
        rtfBox.Dispose();

        return FormatObject;
    }

它应该完全是独立的,不应阻塞任何东西.我正在做的项目有数百万条需要处理的记录,所以我要分批处理工作,并使用任务进行并行处理.它仍然运行得很慢,所以我闯入代码并找到了它.

这是等待任务的调用堆栈

[In a sleep, wait, or join] 
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.CreateHandle(System.Windows.Forms.CreateParams cp) + 0x242 bytes 
System.Windows.Forms.dll!System.Windows.Forms.Control.CreateHandle() + 0x2b2 bytes  
System.Windows.Forms.dll!System.Windows.Forms.TextBoxBase.CreateHandle() + 0x54 bytes   
System.Windows.Forms.dll!System.Windows.Forms.RichTextBox.Rtf.set(string value) + 0x68 bytes    
>CvtCore.dll!CvtCore.StandardFunctions.Str.RtfTextToPlainText(object Expression) Line 494   C#

这是线程816的调用堆栈

[Managed to Native Transition]  
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DefWndProc(ref System.Windows.Forms.Message m) + 0x9e bytes  
System.Windows.Forms.dll!System.Windows.Forms.Control.WmWindowPosChanged(ref System.Windows.Forms.Message m) + 0x39 bytes   
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) + 0x51b bytes 
System.Windows.Forms.dll!System.Windows.Forms.RichTextBox.WndProc(ref System.Windows.Forms.Message m) + 0x5c bytes  
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd, int msg, System.IntPtr wparam, System.IntPtr lparam) + 0x15e bytes    
[Native to Managed Transition]  
[Managed to Native Transition]  
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DefWndProc(ref System.Windows.Forms.Message m) + 0x9e bytes  
System.Windows.Forms.dll!System.Windows.Forms.Control.WmCreate(ref System.Windows.Forms.Message m) + 0x1c bytes 
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) + 0x50b bytes 
System.Windows.Forms.dll!System.Windows.Forms.RichTextBox.WndProc(ref System.Windows.Forms.Message m) + 0x5c bytes  
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd, int msg, System.IntPtr wparam, System.IntPtr lparam) + 0x15e bytes    
[Native to Managed Transition]  
[Managed to Native Transition]  
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.CreateHandle(System.Windows.Forms.CreateParams cp) + 0x44c bytes 
System.Windows.Forms.dll!System.Windows.Forms.Control.CreateHandle() + 0x2b2 bytes  
System.Windows.Forms.dll!System.Windows.Forms.TextBoxBase.CreateHandle() + 0x54 bytes   
System.Windows.Forms.dll!System.Windows.Forms.RichTextBox.Rtf.set(string value) + 0x68 bytes    
>CvtCore.dll!CvtCore.StandardFunctions.Str.RtfTextToPlainText(object Expression) Line 494   C#

为什么任务2在494行的任务4上受阻,难道它们都不完全相互独立吗？

注意

在发布模式下,我抓住了这些堆栈轨迹和屏幕快照,似乎无法在正确的时间暂停以使在调试模式下发生相同的事情.也可能是我动作缓慢的原因吗？探查器说,我的程序将其时间的83.2％花费在`System.Windows.Forms.RichTextBox.set_Rtf(string)(这是第494行调用的子函数)中

任何有关如何加快去除rtf格式的过程的建议,将不胜感激.

附言

我目前正在重写它,所以每个线程都会有一个不会被丢弃的文本框,而不是每次调用该函数时都会创建一个新的文本框,我希望可以大大提高它的速度,我将在执行后更新详细信息它.

更新

我解决了自己的问题(请参见下面的答案),但这是我开始任务的方式

//create start consumer threads
for (int i = 0; i < ThreadsPreProducer; i++)
{
    //create worked and thread
    WorkerObject NewWorkerObject = new WorkerObject(colSource, FormatObjectEvent, UpdateModule);
    Task WorkerTask = new Task(NewWorkerObject.DoWork);
    WorkerTasks.Add(WorkerTask);
    WorkerTask.Start();
}


//create/start producer thread
ProducerObject NewProducerObject = new ProducerObject(colSource, SourceQuery, ConnectionString, PreProcessor, UpdateModule, RowNameIndex);
Task ProducerTask = new Task(NewProducerObject.DoWork);
WorkerTasks.Add(ProducerTask);
ProducerTask.Start();


//block while producer runs
ProducerTask.Wait();

//create post producer threads
for (int i = 0; i < ThreadsPostProducer; i++)
{
    //create worked and thread
    WorkerObject NewWorkerObject = new WorkerObject(colSource, FormatObjectEvent, UpdateModule);
    Task WorkerTask = new Task(NewWorkerObject.DoWork);
    WorkerTasks.Add(WorkerTask);
    WorkerTask.Start();
}

//block until all tasks are done
Task.WaitAll(WorkerTasks.ToArray());

在我的例子中,它使用的是生产者/消费者模型,其中有1个生产者和4个消费者(从生产者开始2个开始,在完成生产者之后2个开始,以在从生产者释放系统资源后加快工作).

解决方法:

将功能更改为

static ThreadLocal<RichTextBox> rtfBox = new ThreadLocal<RichTextBox>(() => new RichTextBox());
//convert RTF text to plain text
public static string RtfTextToPlainText(string FormatObject )
{
     rtfBox.Value.Rtf = FormatObject;
     FormatObject = rtfBox.Value.Text;
     rtfBox.Value.Clear();

     return FormatObject;
}

我的运行时间从几分钟更改为几秒钟.

我不会处理这些对象,因为它们将在程序的整个生命周期中使用.

标签：optimization,richtextbox,c,net-4-0
来源： https://codeday.me/bug/20191102/1991258.html