LongArray Method Call

An LongArray Method Call is a Complex Method Call that returns a LongArray.

• See Methods for explanations of the basics and for Code examples and for the declaration of Method Calls.
  See How to use Method Calls for general information on using Method Calls.
• Go to the complete list of all Complex Method Calls 

Code Example

The example exists of an Operation and a Form. In the operation the Entity Collection(s) and Dataview(s) are defined. The definitions of Lists and Method Call(s) for composing the data, based on input from the user, are also defined in the Forms.

Code example Operation

protected override IForm CreateStartupForm()
{
   return new LongArrayMethodCallDemoFrm(this);
}

public IEntityCollection<LongArrayMethodCallDemoEntity> LongArray
{
   get { return Property(() => new VolatileTable("long array").Select<LongArrayMethodCallDemoEntity>().All()); }
}

public IDataView<LongArrayMethodCallDemoEntity> LongArrayView
{
   get { return Property(() => LongArray.ToView()); }
}

public IEntityCollection<ArticleEntity> Articles
{
    get { return Property(() => Db.Article.Select<ArticleEntity>().All()); }
}

Explanation Code example Operation

1. Lines 1-4: Definition of the Form (see code of the Form below).
2. Lines 6-9: Definition of a Volatile Table. We fill this in the Form (below).
3. Lines 11-14: Definition of the View, which is used to display the data in the Form.
4. Lines 8 and 11: The necessary LongArrayMethodCallDemoEntity is defined elsewhere. Type 'Volatile Table' in the Search box to read more about the working of the Volatile Table.
5. This LongArrayMethodCallDemoEntity is also used in the Form below, on line 14.
6. Lines 16-19: We also need articles for this Code example.

Code example Form

public LongArrayMethodCallDemoFrm(LongArrayMethodCallDemoOp operation) : base(operation)
{

}

protected override IUIElement CreateGui()
{
   return new VBox
   {
       new HBox
       {
           new GroupBox("example",2, alignV:AlignV.Top)
           {
               new DataGrid<LongArrayMethodCallDemoEntity>(Operation.LongArrayView, showColumnHeaders:false)
               {
                   e => e.Value
               }
           }
       },

       new HBox(alignH:AlignH.Fill)
       {
           new Button(GetLongArray()),
           EmptySpace.FillH,
           new Button(Close())
       }
   };
}

private LongArray ComposeLongArray()
{
   return Method(() =>
   {
       return new Body
       {
           new Return(new LongArray(Operation.Articles.Select(f => f.Vat).ToLongArray()))
       };
   });
}

private IMethodCall GetLongArray()
{
   return Method(() =>
   {
       var newListItem = Operation.LongArray.CreateItemReference();
       return new Body
       {
           Operation.LongArray.DeleteAll(),
           array.Assign(ComposeLongArray()),
           array.Foreach(arrayItem => new Body
           {
               newListItem.Assign(Operation.LongArray.New()),
               newListItem.Value.Assign(listItem)
           })
       };

   })
   .SetWorkDescription("get long array")
   .SetImage(WikiImages.Directory)
   .Call();
}

Explanation Code example Form

• Lines 6-28: The definition of the form.
  
• Line 14: The View, based on the Entity (see explanation 3 and 4 of the Operation), are passed to a DataGrid.
• Lines 30-39: This is a private property of the type LongArray. In it, the list is composed and returned (line 36). This LongArray was defined in the Operation as a Volatile Table.
• Line 36: Building up this LongArray is done with the function .ToLongArray that collects the records collected with the Select.
• Lines 41-60: This MethodCall, named GetLongArray(), starts a new instance of LongArray on line 45.
• Line 48: any previous data is deleted.
• Line 49-54: The composed LongArray is assigned to an array. By looping through this array (line 50) the items are assigned (line 52-53).

Example of the result

A form like the one defined above, could look like this.

When starting the application:

After clicking the button: