[英]Is it good practice to pass a StreamReader to a background worker DoWork method?
[英]Pass different method/function to DoWork event of Background worker
請不要理解我對這個問題以及我用過的術語的無知。 請糾正我錯誤的地方。
我已經使用工具箱中的后台工作者到我的表單上,並且我將一個方法傳遞給DoWork事件。 我在背景工作者的第一次嘗試中理解的是,我可以使用我僅為1個任務創建的后台工作程序。 見下面的代碼:
private void btn1_Click(object sender, EventArgs e)
{
// Should call the uploadToDB1 using BackgroundWorker's DoWork event.
backgroundWorker1.RunWorkerAsync();
}
private void btn2_Click(object sender, EventArgs e)
{
// Should call the uploadToDB2 using BackgroundWorker's DoWork event.
backgroundWorker1.RunWorkerAsync();
}
private void uploadToDB1()
{
// Code for uploading to DB 1.
}
private void uploadToDB2()
{
// Code for uploading to DB 2.
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
try
{
uploadToDB1(); // I want to change this to uploadToDB2 i.e. a variable method, How do I assign a call to this?
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Visible = true;
progressBar1.Maximum = maxRecords;
lblProgress.Text = Convert.ToString(e.ProgressPercentage.ToString() + "/" + maxRecords);
progressBar1.Value = e.ProgressPercentage;
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
progressBar1.Visible = false;
lblProgress.Text = "";
}
我需要能夠動態地將方法傳遞給DoWork事件,而不需要創建多個后台Worker,因為與后台Worker相關的其他事件中的操作保持不變。
你能告訴我該如何做到這一點嗎?
使用TPL更新了代碼,但是我遇到了跨線程錯誤。 你能幫忙修改一下代碼嗎? 只有在上傳到DB 1完成后才能上傳到DB 2。 因此,每次上傳時都需要更新標簽和進度條。 我還需要將不同的文本傳遞給標簽。
private void btn1_Click(object sender, EventArgs e)
{
Task.Factory.StartNew(uploadToDB1);
}
private void uploadToDB1()
{
for(i=0;i<dt.rows.count-1;i++)
{
// Code for inserting into DB1.
progressbar1.maximum=dt.rows.count-1;
progressbar1.value=i;
}
uploadToDB2();
}
private void uploadToDB2()
{
for(i=0;i<dt.rows.count-1;i++)
{
// Code for inserting into DB2.
progressbar1.maximum=dt.rows.count-1;
progressbar1.value=i;
}
}
你可以做什么,而且有點像黑客,是將Action
作為調用DoWorkAsync
的參數DoWorkAsync
:
var bw = new BackgroundWorker();
bw.DoWork += (s, o) =>
{
Action actualWork = (Action)o.Argument;
actualWork();
}
當您調用DoWorkAsync
:
Action action = () => DoSomething();
bw.RunWorkerAsync(action);
相反,正如@Sriram建議的那樣,查看Task Parallel Library
,它將使您的生活更輕松:
private async void btn1_Click(object sender, EventArgs e)
{
await Task.Run(UpdateFirst);
// Update UI here.
}
private async void btn2_Click(object sender, EventArgs e)
{
await Task.Run(UpdateSecond);
// Update UI again.
}
關於TPL的廣泛答案和IProgess<T>
可以在如何在異步方法中向UI提供反饋中找到?
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