[英]how do i use background Worker in this for loop c#
How do I use a background worker in this for loop? 如何在此for循环中使用后台工作者?
int tmax = 10;
int xmax = newbitmap.Width;
int ymax = newbitmap.Height;
for (int t = 0; t <= tmax; t += 1)
{
for (int x = 0; x < xmax; x++)
{
for (int y = 0; y < ymax; y++)
{
if ((x / xmax) > (t / tmax))
{
Color originalco = newbitmap2.GetPixel(x, y);
outp.SetPixel(x, y, originalco);
}
else
{
Color originalco3 = newbitmap.GetPixel(x, y); ;
outp.SetPixel(x, y, originalco3);
}
}
pictureBox1.Image = outp;
}
}
This loop is a wipe transition from right to left, but it doesn't display the transition. 此循环是从右到左的划像转场,但不显示转场。
That because the backgroundWorker works in a different thread. 那是因为backgroundWorker在不同的线程中工作。 You can use
backgroundworker.ReportProgress(0, outp)
您可以使用
backgroundworker.ReportProgress(0, outp)
So: You need to register to the event BackgroundWorker.ProgressChanged
from the events window in Vistual Studio, or with this line: 因此:您需要从Vistual Studio的事件窗口中注册到事件
BackgroundWorker.ProgressChanged
,或使用以下代码行:
backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
The method: 方法:
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
var outp = (Bitmap)e.UserState;
prictureBox.Image = outp;
}
Your code sould be then: 您的代码应为:
int tmax = 10;
int xmax = newbitmap.Width;
int ymax = newbitmap.Height;
for (int t = 0; t <= tmax; t += 1)
{
for (int x = 0; x < xmax; x++)
{
for (int y = 0; y < ymax; y++)
{
if ((x / xmax) > (t / tmax))
{
Color originalco = newbitmap2.GetPixel(x, y);
outp.SetPixel(x, y, originalco);
}
else
{
Color originalco3 = newbitmap.GetPixel(x, y); ;
outp.SetPixel(x, y, originalco3);
}
}
backgroundWorker1.ReportProgress(t, outp);
}
}
First, you should use direct pixel manipulation as described here: http://msdn.microsoft.com/en-us/library/5ey6h79d.aspx 首先,您应该按照此处所述使用直接像素操作: http : //msdn.microsoft.com/zh-cn/library/5ey6h79d.aspx
Then, you should use an array as lookup for all your threads which line has already been drawn and which hasn't. 然后,您应该使用一个数组作为所有线程的查找对象,该线程已画线而未画线。 The threads look for a new line in this array and then draw it.
线程在此数组中寻找新行,然后绘制它。 But remember to lock the lookup array!
但是请记住锁定查找数组!
Your Do work method would look something like this: - 您的工作方法将如下所示:-
private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
{
Bitmap newbitmap = (Bitmap)e.Argument;
int tmax = 10;
int xmax = newbitmap.Width;
int ymax = newbitmap.Height;
for (int t = 0; t <= tmax; t += 1)
{
for (int x = 0; x < xmax; x++)
{
for (int y = 0; y < ymax; y++)
{
if ((x / xmax) > (t / tmax))
{
Color originalco = newbitmap2.GetPixel(x, y);
outp.SetPixel(x, y, originalco);
}
else
{
Color originalco3 = newbitmap.GetPixel(x, y); ;
outp.SetPixel(x, y, originalco3);
}
}
pictureBox1.Image = outp;
}
}
bgWorker.ReportProgress(0,outp);
}
Then when your worker reports progress, it would raise the following event where you can safely update the UI: 然后,当您的工作人员报告进度时,它将引发以下事件,您可以在其中安全地更新UI:
private void bgWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
//UPDATE YOUR UI HERE
}
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