我遇到了一个问题，即当附加到视图内的视图时，数据网格没有反映对其集合的更改。更准确地说，我在 MainView 中有一个 SecondView。在 SecondView 上，我有一个将 autogeneratecolumns 设置为 true 的数据网格；首次呈现数据网格时，它会显示相应的列和标题。但是，当我填充附加到它的列表时，不会反映任何更改。
以下是两个视图及其各自视图模型的完整代码： MainWindowView：
<Window x:Class="MyApp.MainWindowView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:cal="http://www.caliburnproject.org"
xmlns:views="clr-namespace:MyApp"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindowView" Height="300" Width="300">
<Grid>
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="File">
<MenuItem Header="Open" x:Name="Open"/>
<MenuItem Header="Exit" x:Name="Exit"/>
</MenuItem>
</Menu>
<StackPanel DockPanel.Dock="Bottom">
<views:SecondView/>
</StackPanel>
</DockPanel>
</Grid>
主窗口视图模型：
namespace MyApp
{
[Export(typeof(IShell))]
internal class MainWindowViewModel : Screen, IShell
{
Regex expression = new Regex(@"^N\d\.C\d\.D\d\.R\d:\s\s\s-\d"); //ex. "N1.C1.D2.R1: -3"
SecondViewModel svm = new SecondViewModel();
public void Open()
{
Microsoft.Win32.OpenFileDialog openFile = new Microsoft.Win32.OpenFileDialog();
openFile.Multiselect = true;
openFile.Filter = "Text Files(*.txt)|*.txt|Log Files(*.log)|*.log|All Files(*.*)|*.*";
openFile.Title = "Open File(s)";
bool? userClickedOK = openFile.ShowDialog();
string[] _fileNames = openFile.FileNames;
if (userClickedOK == true)
{
if (_fileNames != null)
{
for (int i = 0; i < _fileNames.Length; i++)
{
ValidFiles(_fileNames[i]);
}
}
}
}
public void Exit()
{
App.Current.Shutdown();
}
/* ValidFiles() accepts a string containing a filename and creates a Streamreader that reads the file if it is not a Boxboro file.
*/
public void ValidFiles(string filename)
{
string line;
using (StreamReader sr = new StreamReader(filename))
{
while ((line = sr.ReadLine()) != null)
{
if (line.Contains("Mono Status"))
{
Console.WriteLine("File(s) not supported by this parser. Please select a valid file.");
break;
}
else
{
IsMatch(line);
}
}
}
}
/* IsMatch() accepts a string "input" and determines which parsing method to send the string to, if any.
* Strings not matching any of the initial criteria are not processed to limit overhead.
*/
public void IsMatch(string input)
{
Match match = expression.Match(input);
if (match.Success)
{
svm.GetData(input);
}
}
}
}
第二个窗口视图：
<UserControl x:Class="MyApp.SecondView"
xmlns:cal="http://www.caliburnproject.org"
cal:Bind.Model="MyApp.SecondViewModel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<StackPanel>
<DataGrid x:Name="MyList"/>
</StackPanel>
</Grid>
第二个窗口视图模型：
namespace MyApp
{
[Export(typeof(SecondViewModel))]
class SecondViewModel:Screen
{
Parse parse = new Parse();
BindableCollection<MyObject> myList = new BindableCollection<MyObject>();
MyObject myObject;
public MyObject MyObject
{
get { return myObject; }
set
{
myObject = value;
NotifyOfPropertyChange(() => MyList);
}
}
public BindableCollection<MyObject> MyList
{
get { return myList; }
set
{
MyList = value;
NotifyOfPropertyChange(() => MyList);
}
}
public void GetData(string input)
{
string[] tempArray = input.Split();
List<int> tempList = new List<int>();
for (int i = 1; i < tempArray.Length; i++)
{
if (!string.IsNullOrEmpty(tempArray[i]))
{
tempList.Add(Convert.ToInt32(tempArray[i]));
}
}
int[] tempIntArray = tempList.ToArray();
MyObject = new MyObject(tempArray[0], tempIntArray[0], tempIntArray[1], tempIntArray[2], tempIntArray[3]);
this.MyList.Add(MyObject);
Console.WriteLine("MyList has " + MyList.Count.ToString() + " elements.");
//foreach (MyObject item in MyList)
//{
// Console.WriteLine(item.Location);
//}
}
}
}
助推器：
namespace MyApp
{
internal class AppBootStrapper : Bootstrapper<IShell>
{
static AppBootStrapper()
{
//Initializes the logger for debugging, remove or comment out in release.
LogManager.GetLog = type => new DebugLogger(type);
}
private CompositionContainer container;
protected override void BuildUp(object instance)
{
this.container.SatisfyImportsOnce(instance);
}
protected override void Configure()
{
this.container =
new CompositionContainer(
new AggregateCatalog(
AssemblySource.Instance.Select(x => new AssemblyCatalog(x)).OfType<ComposablePartCatalog>()));
var batch = new CompositionBatch();
batch.AddExportedValue<IWindowManager>(new WindowManager());
batch.AddExportedValue<IEventAggregator>(new EventAggregator());
batch.AddExportedValue(this.container);
this.container.Compose(batch);
}
protected override IEnumerable<object> GetAllInstances(Type serviceType)
{
return this.container.GetExportedValues<object>(AttributedModelServices.GetContractName(serviceType));
}
//This method is required for the BootStrapper.cs to be discovered.
protected override object GetInstance(Type serviceType, string key)
{
string contract = string.IsNullOrEmpty(key) ? AttributedModelServices.GetContractName(serviceType) : key;
IEnumerable<object> exports = this.container.GetExportedValues<object>(contract);
if (exports.Count() > 0)
{
return exports.First();
}
throw new Exception(string.Format("Could not locate any instances of contract {0}.", contract));
}
}
}
根据我对 Caliburn.Micro 的理解，每当更新 observablecollection MyList（添加新项目）时，都应该更新带有 x:name MyList 的数据网格。即使没有数据模板，我想我也会看到一个空白条目列表，其长度等于 MyList 中的对象数。当我在 MainViewModel 中而不是在绑定到 MainView 的用户控件中使用相同的代码时，呈现列表没有问题。看来我错过了关于在视图中更新视图的一些东西。
我应该注意，我可以通过使用 Console.WriteLine(MyList.Count.ToString()) 并观察输出窗口来验证列表中是否包含对象。我讨厌问这些事情，每次我这样做的时候都是一个错字或同样愚蠢的事情，但我已经被困在这里太久了。
注意：即使在每次迭代中抛出 MyList.Refresh()，数据网格中也不会发生任何变化。
注意：这似乎可以回答我的问题，但我不明白如何实现它。也许如果其他人理解得更好，他们可以将代码行放在我代码中的适当位置并解释它为什么起作用。提前致谢。Caliburn.Micro 基于约定的绑定在嵌套视图中不起作用？