/// <summary>
/// Open a window with the specific window info.
/// </summary>
/// <param name="openWindowInfo">The info of the window to be opened</param>
public virtual void ShowWindow(OpenWindowInfo openWindowInfo)
{
if (openWindowInfo == null || openWindowInfo.WindowType == null)
{
throw new ArgumentNullException(nameof(openWindowInfo), "WindowType cannot be null");
}
Window window = null;
object windowObj = null;
try
{
windowObj = Activator.CreateInstance(openWindowInfo.WindowType);
window = windowObj as Window;
}
catch (Exception ex)
{
throw new InvalidOperationException("Cannot create a window with the given type", ex);
}
if (openWindowInfo.Parameter != null && window.DataContext != null &&
window.DataContext is ViewModelRootBase)
{
(window.DataContext as ViewModelRootBase).Data = openWindowInfo.Parameter;
}
if (openWindowInfo.IsModal)
{
window.ShowDialog();
}
else
{
window.Show();
}
}
/// <summary>
/// Open a window with the specific window info, and handle the return value when the target window closed.
/// </summary>
/// <param name="openWindowInfo">The info of the window to be opened.</param>
/// <param name="action">The <see cref="Action"/> to handle the return value.</param>
public virtual void ShowWindow(OpenWindowInfo openWindowInfo, Action <object> action)
{
if (openWindowInfo == null || openWindowInfo.WindowType == null)
{
throw new ArgumentNullException(nameof(openWindowInfo), "WindowType cannot be null");
}
Window window = null;
object windowObj = null;
try
{
windowObj = Activator.CreateInstance(openWindowInfo.WindowType);
window = windowObj as Window;
}
catch (Exception ex)
{
throw new InvalidOperationException("Cannot create a window with the given type", ex);
}
if (openWindowInfo.Parameter != null && window.DataContext != null &&
window.DataContext is ViewModelRootBase)
{
(window.DataContext as ViewModelRootBase).Data = openWindowInfo.Parameter;
}
EventHandler closeEventHanlder = (s, e) =>
{
var vmType = window.DataContext.GetType();
var geType = typeof(IWindowReturnValue <>);
if (vmType is IWindowReturnValue)
{
var value = (window.DataContext as IWindowReturnValue).ReturnValue;
action?.Invoke(value);
}
else
{
// generic interface
var geTypeInterface = vmType.GetInterfaces()
.Where(t => t.IsGenericType)
.FirstOrDefault(t => t.GetGenericTypeDefinition() == typeof(IWindowReturnValue <>));
if (geTypeInterface != null)
{
var value = geTypeInterface.GetProperty(nameof(IWindowReturnValue.ReturnValue)).GetValue(window.DataContext, null);
action?.Invoke(value);
}
}
};
window.Closed -= closeEventHanlder;
window.Closed += closeEventHanlder;
if (openWindowInfo.IsModal)
{
window.ShowDialog();
}
else
{
window.Show();
}
}
