public void BeginInitEndInit_WithISupportInitializeNotificationDataSourceInitialized_DoesNotWaitForDataSourceInitialize()
{
var dataSource = new ISupportInitializeNotificationDataSource {
IsInitializedResult = true
};
using var bindingSource = new BindingSource(dataSource, nameof(ISupportInitializeNotificationDataSource.Member));
ISupportInitializeNotification source = bindingSource;
int callCount = 0;
EventHandler handler = (sender, e) =>
{
callCount++;
Assert.Same(source, sender);
Assert.Equal(EventArgs.Empty, e);
};
source.Initialized += handler;
source.BeginInit();
Assert.False(source.IsInitialized);
Assert.Equal(0, callCount);
source.EndInit();
Assert.True(source.IsInitialized);
Assert.Equal(1, callCount);
// Call again.
source.EndInit();
Assert.True(source.IsInitialized);
Assert.Equal(2, callCount);
}
public void BeginInitEndInit_Invoke_Success()
{
using var bindingSource = new BindingSource();
ISupportInitializeNotification source = bindingSource;
source.BeginInit();
Assert.False(source.IsInitialized);
source.EndInit();
Assert.True(source.IsInitialized);
}
public void BeginInitEndInit_SetDataSourceInInit_Success(object newDataSource)
{
var dataSource = new ISupportInitializeNotificationDataSource {
IsInitializedResult = false
};
using var bindingSource = new BindingSource(dataSource, nameof(ISupportInitializeNotificationDataSource.Member));
ISupportInitializeNotification source = bindingSource;
int callCount = 0;
EventHandler handler = (sender, e) =>
{
callCount++;
Assert.Same(source, sender);
Assert.Equal(EventArgs.Empty, e);
};
source.Initialized += handler;
dataSource.Initialized += (sender, e) =>
{
((BindingSource)source).DataSource = newDataSource;
};
source.BeginInit();
Assert.False(source.IsInitialized);
Assert.Equal(0, callCount);
// Call the source init - should not initialize and should instead wait for
// the data source initialization.
source.EndInit();
Assert.False(source.IsInitialized);
Assert.Equal(0, callCount);
// Then, call the data source init.
dataSource.EndInit();
Assert.True(source.IsInitialized);
Assert.Equal(1, callCount);
// Call again.
source.EndInit();
Assert.True(source.IsInitialized);
Assert.Equal(2, callCount);
}