Intersoft Community - ClientUI - Duplicate function for MVVM data application

Duplicate function for MVVM data application

mg@hsig.ch — Mon, 17 Oct 2011 10:22:43 GMT

Hi Yudi

Thanks for very helpful sample! For all with the same problem. I've implemented it like this:

Changes in EditableGridViewModelGenericBase.cs

public EditableGridViewModelBase()
    : base()
{
    // Batch update is not supported in WCF RIA Services.
    this.IsBatchUpdate = false;
    this.AutoEditOperation = false;

    this.DeleteRowCommand = new DelegateCommand(ExecuteDeleteRow);
    ...
    this.DuplicateRowCommand = new DelegateCommand(ExecuteDuplicateRow);
}


public DelegateCommand DuplicateRowCommand { get; set; }


protected virtual void ExecuteDuplicateRow(object parameter)
{
    this.EditableProductsSource.Insert(parameter as T);

    if (!this.IsBatchUpdate)
        this.SaveChanges();
    else
        this.HasChanges = true;
}

Changes in *ViewModel.cs

protected override void ExecuteDuplicateRow(object parameter)
{
    Person currentPerson = parameter as Person;
    Person duplicatePerson = new Person();
    duplicatePerson.ID = System.Guid.Empty; //.NewGuid();
    duplicatePerson.Name = currentPerson.Name + " - Copy";
    duplicatePerson.Vorname = currentPerson.Vorname;
    base.ExecuteDuplicateRow(duplicatePerson);
}

Regards

Michael

Duplicate function for MVVM data application

yudi — Sun, 16 Oct 2011 20:40:33 GMT

I’m currently still investigating this issue and need more time to provide you with solution, suggestion, or sample.

I’ll get back to you as soon as possible.

Edited: adding reply information

It is suggested to create the new command in the view model class rather than create it in the ViewModelBase, in this case is in the EditableGridViewModelBase.

The snippet code below shows how add the new command in ProductsViewModel class.

internal override void ExecuteUpdateRow(object parameter)
{   
    Product oldValue = parameter as Product;
    Product prod = new Product();
    prod.ProductID = 0;
    prod.ProductName = oldValue.ProductName;
    prod.Category = oldValue.Category;
    prod.UnitPrice = oldValue.UnitPrice;
    prod.UnitsInStock = oldValue.UnitsInStock;
    prod.UnitsOnOrder = oldValue.UnitsOnOrder;
    prod.QuantityPerUnit = oldValue.QuantityPerUnit;
    prod.Discontinued = oldValue.Discontinued;
    ExecuteInsertRow(prod);
    base.ExecuteUpdateRow(parameter);
}

In order to set/change the primary key, you can try to set it to 0 value (using technique that mimic when user add new row)

internal override void ExecuteUpdateRow(object parameter)
{   
    Product oldValue = parameter as Product;
    Product prod = new Product();
    prod.ProductID = 0;
    ...
}

The same approach also shows how to get the “Product” object.

Hope this helps.

Duplicate function for MVVM data application

mg@hsig.ch — Thu, 13 Oct 2011 16:24:16 GMT

I use the ClientUI MVVM data application (WCF RIA SP1) Template.
I would like to integrate a duplicating function. That is, that I would like to copy the selected row and insert it as a duplicate. All column values should be copied except the primary key (GUID). This is to be regenerated by the application.

I have now created a new command (DuplicateRowCommand) in the class EditableGridViewModelBase. I've bound the command to a UXButton.

public EditableGridViewModelBase() : base()

{

// Batch update is not supported in WCF RIA Services. this.IsBatchUpdate = false; this.AutoEditOperation = false; ... this.ValidateRowCommand = new DelegateCommand(ExecuteValidateRow); this.DuplicateRowCommand = new DelegateCommand(ExecuteDuplicateRow);

}

private void ExecuteDuplicateRow(object parameter)

{

this.EditableProductsSource.Insert(this.SelectedItem); if (!this.IsBatchUpdate) this.SaveChanges(); else this.HasChanges = true;

}

How / where do I change the primary key? I have problems, because it is a generic class. Should I override ExecuteDuplicateRow in each ViewModel?
How do to I best this?

A simpler sample is to initialize default values:

How can I add default values? How do I get the "product" object?

((parameter.GetType())(parameter).ProductName = "New Product" does not work...

private void ExecutePrepareNewRow(object parameter)

{

// It's possible to initialize the new row with default values

// Example:

// product.ProductName = "New Product";

this.NewItem = this.EditableProductsSource.Create() as T;

this.EditableProductsSource.Insert(this.NewItem);

}

Thanks for help!

Michael