[英]DataGridView and Multi-Threading
我正在尝试将我的foreach
方法转换为多线程。
我有一个datagridview
,该方法从cell[0]
(包含一个url)获取值,并将其发送到与httpwebrequest
一起使用的另一个方法。
public void UrlCheck()
{
foreach (DataGridViewRow row in dataUrlList.Rows)
{
string url= row.Cells[0].Value.ToString();
try
{
string get = getHtml(url);
//work with get string removed
if()
{
row.Cells[1].Value = "page info here";
}
else
{
row.Cells[1].Value = "error info here";
}
}
catch
{
}
}
MessageBox.Show("Done.");
}
上面的代码可以正常工作,但顺序正常。
然后,我尝试将这段代码转换为多线程代码:
按键:
private void button9_Click(object sender, EventArgs e)
{
int threadcount = Convert.ToInt32(numThreadSearch.Value);
ThreadForSearch = new Thread[threadcount];
checkingForSearch = dataUrlList.Rows.Count;
isRunningForSearch = true;
beenCheckedForSearch = 1;
for (int i = 0; i <= threadcount - 1; i++)
{
ThreadForSearch[i] = new Thread(new ParameterizedThreadStart(MultiThreadMet));
ThreadForSearch[i].Start(i);
}
}
和多线程方法在这里:
public void MultiThreadMet (object IndexForSearch)
{
int index = (int)IndexForSearch;
DataGridViewRow row = dataUrlList.Rows[index];
while (isRunningForSearch)
{
try
{
if (beenCheckedForSearch >= checkingForSearch)
{
isRunningForSearch = false;
}
if (index >= dataUrlList.Rows.Count)
{
ThreadForSearch[index].Abort();
}
//For just test i'm trying to add "test" in every cell[1] in datagridview
dataUrlList.Invoke(new Action(() => row.Cells[1].Value = "test"));
beenCheckedForSearch++;
}
catch
{
}
}
ThreadForSearch[1].Abort();
}
它获取线程计数以从numericUpDown控件运行,如果我从numericUpDown中选择值10,则会在datagridview的前10个单元格中放置“测试”文本,然后停止,如果我选择4(或2,5,7) ,然后将“测试”文本放在前4(2,5,7)个单元格中并停止。
线程完成后,它不会继续到下一行。 因此,我尝试触发5个线程(我总是从numericUpDown中选择它),并且当一个线程完成其工作时,它必须转到下一行。我该如何解决此问题?
还声明了这些变量:
Thread[] ThreadForSearch;
int beenCheckedForSearch;
int checkingForSearch;
private bool isRunningForSearch;
从输出屏幕我得到
Exception thrown: 'System.Threading.ThreadAbortException' in mscorlib.dll
谢谢。
在线程方法中, 索引计数器未增加。
我会让您解决该程序中仍然存在的重叠问题。 假设有50个url,问题在于线程1将更新单元格0到49,线程2将更新单元格1到49,依此类推。
public void MultiThreadMet (object IndexForSearch)
{
int index = (int)IndexForSearch;
while (isRunningForSearch)
{
try
{
if (index >= dataUrlList.Rows.Count)
{
return;
}
DataGridViewRow row = dataUrlList.Rows[index];
index++;
//For just test i'm trying to add "test" in every cell[1] in datagridview
dataUrlList.Invoke(new Action(() => row.Cells[1].Value = "test"));
}
catch
{
}
}
}
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