在一个单独的UI线程WPF加载动画？ （C＃） [英] WPF loading animation on a separate UI thread? (C#)
问题描述
好吧，我有一个运行而大型的DataTable填充，让用户知道该程序不冻结加载动画。我有动画工作正常，但它冻结，而数据表是updatingv为好。是否有某种方式有多个线程的用户界面，使动画将继续，而数据表加载信息来运行？
Okay, I have a loading animation that runs while a large DataTable is populated to let the user know that the program has not frozen. I have the animation working fine, but it freezes while the DataTable is updatingv as well. Is there some way to have multiple UI threads, so that the animation will continue to run while the DataTable is loading information?
编辑：当前code低于
private void CreateFileTable()
{
file_data = new DataSet();
data_table = new DataTable();
file_data.Tables.Add(data_table);
DataColumn tempCol = new DataColumn("File Name", typeof(string));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Ext", typeof(string));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Size", typeof(string));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Created", typeof(Label));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Modified", typeof(Label));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Accessed", typeof(Label));
data_table.Columns.Add(tempCol);
tempCol = new DataColumn("Location", typeof(string));
data_table.Columns.Add(tempCol);
File_List.ItemsSource = file_data.Tables[0].DefaultView;
}
private void PopulateDirectories(string[] directories)
{
for (int i = 0; i < directories.Length; i++)
{
DirectoryInfo tempDirInfo = new DirectoryInfo(directories[i]);
bool isSystem = ((tempDirInfo.Attributes & FileAttributes.System) == FileAttributes.System);
if (!isSystem)
{
DataRow tempRow = data_table.NewRow();
tempRow["File Name"] = tempDirInfo.Name;
tempRow["Ext"] = "";
tempRow["Size"] = "";
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempDirInfo.CreationTime.ToLongDateString() + ", " + tempDirInfo.CreationTime.ToLongTimeString();
tempRow["Created"] = tempLabel;
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempDirInfo.LastWriteTime.ToLongDateString() + ", " + tempDirInfo.LastWriteTime.ToLongTimeString();
tempRow["Modified"] = tempLabel;
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempDirInfo.LastAccessTime.ToLongDateString() + ", " + tempDirInfo.LastAccessTime.ToLongTimeString();
tempRow["Accessed"] = tempLabel;
tempRow["Location"] = tempDirInfo.FullName;
data_table.Rows.Add(tempRow);
}
}
}
private void PopulateFiles(string[] files)
{
for (int i = 0; i < files.Length; i++)
{
FileInfo tempFileInfo = new FileInfo(files[i]);
bool isSystem = ((File.GetAttributes(files[i]) & FileAttributes.System) == FileAttributes.System);
if (!isSystem)
{
DataRow tempRow = data_table.NewRow();
tempRow["File Name"] = tempFileInfo.Name;
tempRow["Ext"] = tempFileInfo.Extension;
int fileSize = (int)tempFileInfo.Length;
if (fileSize > 1048576)
{
tempRow["Size"] = "" + fileSize / 1048576 + " MB";
}
else if (fileSize > 1024)
{
tempRow["Size"] = "" + fileSize / 1024 + " KB";
}
else
{
tempRow["Size"] = "" + fileSize + " B";
}
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempFileInfo.CreationTime.ToLongDateString() + ", " + tempFileInfo.CreationTime.ToLongTimeString();
tempRow["Created"] = tempLabel;
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempFileInfo.LastWriteTime.ToLongDateString() + ", " + tempFileInfo.LastWriteTime.ToLongTimeString();
tempRow["Modified"] = tempLabel;
tempLabel = new Label();
tempLabel.Padding = new Thickness(2, 0, 2, 0);
tempLabel.Content = tempFileInfo.LastAccessTime.ToLongDateString() + ", " + tempFileInfo.LastAccessTime.ToLongTimeString();
tempRow["Accessed"] = tempLabel;
tempRow["Location"] = tempFileInfo.DirectoryName;
data_table.Rows.Add(tempRow);
}
}
}
private string GetSelectedPath(TreeViewItem selectedNode)
{
return selectedNode.Tag as string;
}
private void PopulateFileList()
{
PopulateDirectories(Directory.GetDirectories(GetSelectedPath((TreeViewItem)Dir_Tree.SelectedItem)));
PopulateFiles(Directory.GetFiles(GetSelectedPath((TreeViewItem)Dir_Tree.SelectedItem)));
}
private void UpdateFileList()
{
LoadingWheel.Visibility = System.Windows.Visibility.Visible;
CreateFileTable();
PopulateFileList();
TxtFoundCount.Text = "Files/Folders Found: " + File_List.Items.Count;
LoadingWheel.Visibility = System.Windows.Visibility.Hidden;
}
我已经使用BackgroundWorker并调用它里面的UpdateFileList（）方法试过，但我没有任何运气。
I have tried using the BackgroundWorker and calling the UpdateFileList() method inside it, but I'm not having any luck.
编辑：下面是我的code为BackgroundWorker的
private BackgroundWorker bgWorker1;
private void InitializeBackgroundWorker()
{
bgWorker1 = new BackgroundWorker();
bgWorker1.DoWork += new DoWorkEventHandler(bgWorker1_DoWork);
bgWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgWorker1_RunWorkerCompleted);
}
private void bgWorker1_DoWork(object sender, DoWorkEventArgs e)
{
if (Dispatcher.CheckAccess())
{
PopulateFileList();
}
else
{
Dispatcher.Invoke(new Action(() => PopulateFileList()));
}
}
private void bgWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
TxtFoundCount.Text = "Files/Folders Found: " + File_List.Items.Count;
LoadingWheel.Visibility = System.Windows.Visibility.Hidden;
}
private void UpdateFileList()
{
LoadingWheel.Visibility = System.Windows.Visibility.Visible;
CreateFileTable();
bgWorker1.RunWorkerAsync();
}
我有一个调用InitializeBackgroundWorker（）和UpdateFileList（）一个TreeView一个SelectionChanged事件。列表加载的是，我没有错误，但加载动画从来没有变得可见。
I have a SelectionChanged event on a TreeView that calls InitializeBackgroundWorker() and UpdateFileList(). The list loads still, and I get no errors, but the loading animation never becomes visible.
任何帮助将大大AP preciated。
Any help would be greatly appreciated.
感谢。
推荐答案
有只有一个UI线程。你需要做的是装载在不同的线程中的数据表中的数据。
There is only one UI thread. What you need to do is to load the data in the DataTable on a different thread.
如果你想显示沿途DataTable中加载进度（直接或通过一个或进度其他机制），在<一个href=\"http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx\">BackgroundWorker是一个相当直接的方式做到这一点。
If you want to show progress to the DataTable loading along the way (either directly, or through a ProgressBar or some other mechanism), the BackgroundWorker is a fairly straight-forward way to do that.
更新：很简单背景工人例如
这里是一个非常简单的例子。它增加了100的随机数到集合，暂停该线程为每个之间很短的时间，以模拟长期加载过程。你可以简单地剪切和粘贴到您自己的测试项目，看看它的工作。
UPDATE: Very Simple Background Worker example
Here is a fairly simple example. It adds 100 random numbers to a collection, pausing the thread for a short time between each to simulate a long loading process. You can simply cut and paste this into a test project of your own to see it work.
要注意的一点是，繁重的任务（即需要一段时间的东西）在DoWork的完成，而所有的UI更新在ProgressChanged和RunWorkerCompleted完成。事实上，在DoWork的处理程序创建一个单独的列表（数字），因为全球mNumbers集合是在UI线程上，而且在DoWork的处理程序不能相互作用。
The thing to notice is that the heavy lifting (the stuff that takes a while) is done in the DoWork, while all UI updates are done in ProgressChanged and RunWorkerCompleted. In fact, a separate list (numbers) is created in the DoWork handler because the global mNumbers collection is on the UI thread, and can't interact in the DoWork handler.
XAML
<Button x:Name="btnGenerateNumbers"
Grid.Row="1"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Content="Generate Numbers" />
C＃code-背后
BackgroundWorker bgWorker = new BackgroundWorker();
ObservableCollection<int> mNumbers = new ObservableCollection<int>();
public Window1()
{
InitializeComponent();
bgWorker.DoWork +=
new DoWorkEventHandler(bgWorker_DoWork);
bgWorker.ProgressChanged +=
new ProgressChangedEventHandler(bgWorker_ProgressChanged);
bgWorker.RunWorkerCompleted +=
new RunWorkerCompletedEventHandler(bgWorker_RunWorkerCompleted);
bgWorker.WorkerReportsProgress = true;
btnGenerateNumbers.Click += (s, e) => UpdateNumbers();
this.DataContext = this;
}
void bgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
progress.Visibility = Visibility.Collapsed;
lstItems.Opacity = 1d;
btnGenerateNumbers.IsEnabled = true;
}
void bgWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
List<int> numbers = (List<int>)e.UserState;
foreach (int number in numbers)
{
mNumbers.Add(number);
}
progress.Value = e.ProgressPercentage;
}
void bgWorker_DoWork(object sender, DoWorkEventArgs e)
{
Random rnd = new Random();
List<int> numbers = new List<int>(10);
for (int i = 1; i <= 100; i++)
{
// Add a random number
numbers.Add(rnd.Next());
// Sleep from 1/8 of a second to 1 second
Thread.Sleep(rnd.Next(125, 1000));
// Every 10 iterations, report progress
if ((i % 10) == 0)
{
bgWorker.ReportProgress(i, numbers.ToList<int>());
numbers.Clear();
}
}
}
public ObservableCollection<int> NumberItems
{
get { return mNumbers; }
}
private void UpdateNumbers()
{
btnGenerateNumbers.IsEnabled = false;
mNumbers.Clear();
progress.Value = 0;
progress.Visibility = Visibility.Visible;
lstItems.Opacity = 0.5;
bgWorker.RunWorkerAsync();
}
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