/// <summary>
/// Publish Dependant Component Changes
/// </summary>
/// <typeparam name="T">Type of property</typeparam>
/// <param name="propertyName">Property Name that has changed</param>
/// <param name="value">new value for Property</param>
private void PublishDependentComponentChanges <T>(string propertyName, T value)
{
System.ComponentModel.Design.IComponentChangeService changeService = null;
System.ComponentModel.PropertyDescriptor property = null;
T currentValue = default(T);
if (DesignMode && this.Site != null)
{
property = System.ComponentModel.TypeDescriptor.GetProperties(this)[propertyName];
changeService = (System.ComponentModel.Design.IComponentChangeService) this.Site.GetService(typeof(System.ComponentModel.Design.IComponentChangeService));
if (changeService != null)
{
currentValue = (T)property.GetValue(this);
if (currentValue == null)
{
currentValue = default(T);
}
// Trap any error and ignore it
changeService.OnComponentChanging(this, property);
// try to set new value
property.SetValue(this, value);
changeService.OnComponentChanged(this, property, currentValue, value);
}
}
}
/// <summary>
/// Call the dialog to edit the TableMappings
/// </summary>
/// <param name="context"></param>
/// <param name="provider">Service provider.</param>
/// <param name="value">DataTableMappingCollection object.</param>
/// <returns></returns>
public override object EditValue(
ITypeDescriptorContext context,
IServiceProvider provider,
object value) // DataTableMappingCollection object
{
if (context != null &&
context.Instance != null &&
provider != null)
{
IWindowsFormsEditorService edSvc =
(IWindowsFormsEditorService)provider.GetService(
typeof(IWindowsFormsEditorService));
if (edSvc != null)
{
System.ComponentModel.Design.IDesignerHost host =
provider.GetService(
typeof(System.ComponentModel.Design.IDesignerHost))
as System.ComponentModel.Design.IDesignerHost;
if (host == null)
{
System.Windows.Forms.MessageBox.Show(
"The IDesignerHost service interface " +
"could not be obtained to process the request.",
"Table Mappings");
return(value);
}
System.ComponentModel.Design.IComponentChangeService chgSvc =
provider.GetService(
typeof(System.ComponentModel.Design.IComponentChangeService))
as System.ComponentModel.Design.IComponentChangeService;
if (chgSvc == null)
{
System.Windows.Forms.MessageBox.Show(
"The IComponentChangeService service interface " +
"could not be obtained to process the request.",
"Table Mappings");
return(value);
}
if (!context.OnComponentChanging())
{
System.Windows.Forms.MessageBox.Show(
"The component is not permitted to be changed.",
"Table Mappings");
return(value);
}
System.ComponentModel.Design.DesignerTransaction
designerTxn = host.CreateTransaction("TableMapping");
DbDataAdapter adapter = (DbDataAdapter)context.Instance;
Form form = new TableMapForm(adapter);
chgSvc.OnComponentChanging(adapter, null);
using (form)
{
using (designerTxn)
{
try
{
DialogResult result = edSvc.ShowDialog(form);
if (result == DialogResult.OK)
{
designerTxn.Commit();
}
else
{
designerTxn.Cancel();
}
}
finally
{
chgSvc.OnComponentChanged(adapter, null, null, null);
// context.OnComponentChanged();
}
}
}
} // end if (edSvc != null)
} // end if context is OK
return(value);
}