.net 实时更新WPF中的进度条
我使用下面的代码在WPF VSTO应用程序中实时更新了一个进度条 但是,有一个问题,行.net 实时更新WPF中的进度条,.net,wpf,vsto,.net,Wpf,Vsto,我使用下面的代码在WPF VSTO应用程序中实时更新了一个进度条 但是,有一个问题,行object[,]obj=GetOutput(objInput)抛出一个错误,说明它无法访问此对象,因为它位于不同的线程中。当我将其置于Dispatch.Invoke下时,我的进度条不会实时更新。有人能帮我吗 private BackgroundWorker backgroundWorker1 = new BackgroundWorker(); private object[,] GetOutput(obje
object[,]obj=GetOutput(objInput)代码>抛出一个错误,说明它无法访问此对象,因为它位于不同的线程中。当我将其置于Dispatch.Invoke下时,我的进度条不会实时更新。有人能帮我吗
private BackgroundWorker backgroundWorker1 = new BackgroundWorker();
private object[,] GetOutput(object[,] obj)
{
object[,] objOutput = null;
if (rdUpper.IsChecked == true) //--- This UI element is causing the issue
objOutput = t1.ConvertCase(obj);
return objOutput;
}
private void btnTest_Click(object sender, RoutedEventArgs e)
{
t1.OnProgressUpdate += t1_OnProgressUpdate;
pb.Maximum = 30;
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.WorkerSupportsCancellation = true;
backgroundWorker1.DoWork += backgroundWorker1_DoWork;
backgroundWorker1.RunWorkerAsync();
}
private void t1_OnProgressUpdate(int value)
{
Dispatcher.Invoke((Action)delegate
{
pb.Value = value;
});
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
try
{
Excel.Range SelectedRange = Globals.ThisAddIn.Application.Selection as Excel.Range;
foreach (Excel.Range rngArea in SelectedRange.Areas)
{
objInput = Common.GetObject(SelectedRange);
object[,] obj = GetOutput(objInput); //-- This throws an error
// rngArea.Value = obj;
backgroundWorker1.CancelAsync();
}
}
catch(Exception ex)
{
throw;
}
}
}
class testClass
{
public delegate void ProgressUpdate(int value);
public event ProgressUpdate OnProgressUpdate;
public object[,] ConvertCase(object[,] objInput)
{
object[,] objOutput = (object[,])objInput.Clone();
for (int row = objInput.GetLowerBound(0); row <= objInput.GetUpperBound(0); row++)
{
for (int col = objInput.GetLowerBound(1); col <= objInput.GetUpperBound(1); col++)
{
objOutput[row, col] = objInput[row, col] is null ? null : objInput[row, col].ToString().ToUpper();
}
Thread.Sleep(200); // To check and see the real time progress update
if (OnProgressUpdate != null)
{
OnProgressUpdate(row);
}
}
return objOutput;
}
}
private BackgroundWorker backgroundWorker1=new BackgroundWorker();
私有对象[,]GetOutput(对象[,]obj)
{
对象[,]objOutput=null;
如果(rdUpper.IsChecked==true)/---此UI元素导致问题
objOutput=t1.ConvertCase(obj);
返回对象输出;
}
私有void btnTest\u单击(对象发送者,路由目标e)
{
t1.OnProgressUpdate+=t1_OnProgressUpdate;
pb.最大值=30;
backgroundWorker1.WorkerReportsProgress=true;
backgroundWorker1.WorkerSupportsScanCellation=true;
backgroundWorker1.DoWork+=backgroundWorker1_DoWork;
backgroundWorker1.RunWorkerAsync();
}
私有void t1_OnProgressUpdate(int值)
{
Dispatcher.Invoke((操作)委托
{
pb.价值=价值;
});
}
私有void backgroundWorker1\u DoWork(对象发送方,DoWorkEventArgs e)
{
尝试
{
Excel.Range SelectedRange=Globals.ThisAddIn.Application.Selection作为Excel.Range;
foreach(选定范围区域中的Excel.Range rngArea)
{
objInput=Common.GetObject(SelectedRange);
object[,]obj=GetOutput(objInput);//--这会引发一个错误
//rngArea.Value=obj;
backgroundWorker1.CancelAsync();
}
}
捕获(例外情况除外)
{
投
}
}
}
类testClass
{
公共委托无效进程更新(int值);
公共事件进展更新;
公共对象[,]ConvertCase(对象[,]objInput)
{
对象[,]objOutput=(对象[,])objInput.Clone();
对于(int row=objInput.GetLowerBound(0);row您正在使用BackgroundWorker
false。您对ProgressUpdate的调用是从后台线程调用的
您必须从BackgroundWorker
订阅ProgressChanged
-事件。在这种方法中,您可以在UI线程上执行操作
请看下面的代码:
private void Button1_Click(object sender, RoutedEventArgs e)
{
BackgroundWorker backgroundWorker = new BackgroundWorker();
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.WorkerSupportsCancellation = true;
backgroundWorker.DoWork += BackgroundWorkerOnDoWork;
backgroundWorker.ProgressChanged += BackgroundWorkerOnProgressChanged;
backgroundWorker.RunWorkerAsync(t1);
}
private void BackgroundWorkerOnProgressChanged(object sender, ProgressChangedEventArgs e)
{
// This method will be called if in the DoWork-Method a call to ReportProgress is made.
// You can access the provided data with:
object data = e.UserState;
}
private void BackgroundWorkerOnDoWork(object sender, DoWorkEventArgs e)
{
testClass t1 = (testClass) e.Argument;
// Your async-logic here. Everything here will be executed in a Thread
// If you want to update the UI you have to do the following:
((BackgroundWorker)sender).ReportProgress(0, "OBJECT-TO-PASS-TO-THE-UI-THREAD");
}
由于无法访问后台线程上控件或其他UI元素的属性,因此在启动后台工作程序之前,应检查IsChecked
属性是否为true
将值存储在传递给RunWorkerAsync
方法的bool
变量中:
private object[,] GetOutput(object[,] obj, bool isChecked)
{
object[,] objOutput = null;
if (isChecked)
objOutput = t1.ConvertCase(obj);
return objOutput;
}
private void btnTest_Click(object sender, RoutedEventArgs e)
{
t1.OnProgressUpdate += t1_OnProgressUpdate;
pb.Maximum = 30;
bool isChecked = rdUpper.IsChecked == true;
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.WorkerSupportsCancellation = true;
backgroundWorker1.DoWork += backgroundWorker1_DoWork;
backgroundWorker1.RunWorkerAsync(isChecked);
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
Excel.Range SelectedRange = Globals.ThisAddIn.Application.Selection as Excel.Range;
foreach (Excel.Range rngArea in SelectedRange.Areas)
{
objInput = Common.GetObject(SelectedRange);
bool isChecked = (bool)e.Argument;
object[,] obj = GetOutput(objInput, isChecked);
// rngArea.Value = obj;
backgroundWorker1.CancelAsync();
}
}
在GetOutput方法中,我发现了另一个问题,我正在访问导致问题的UI元素,如果(rdUpper.IsChecked==true)(我编辑了代码)选中此项。除UI线程外,其他线程也不能直接访问UI元素。@SamK:您不应该在DoWork
中访问UI元素,您的GetOutput
做什么?@mm8我在UI上有几个单选按钮,根据选择,GetOutput将不同的枚举传递给TestClass并获取output@SamK:你应该将其包含在问题中。但无论如何,您无法访问后台线程上的单选按钮而不获得异常。如何在BackgroundWorkRondWork方法中获取ProgressPercentage?您必须计算该值,然后才能将其传递给ProgressChanged方法如何从TestClas调用ProgressChanged我在类上有一个委托和事件,我可以更新它。我在这里有点困惑。