Index Expression

For BusinessProcess

Name in Migrated Code: OrderBy
Location in Migrated Code: OnLoad Method

Example :

protected override void OnLoad()
{
    OrderBy = Customers.Indexes[u.If(v_Indicator == 1,
        Category.Indexes.IndexOf(Category.SortByCategoryID), 
        Category.Indexes.IndexOf(Category.SortByCategoryName))];
} 

For UIController

Name in Migrated Code: BindOrderBy
Location in Migrated Code: InitializeDataView Method

In UIController we use the BindOrderBy instead of a simple set to the OrderBy because this expression is evaluated during the execution of the UIController in cases of ReloadData and other cases.

Example:

protected override void InitializeDataView()
{
    BindOrderBy(() => Customers.Indexes[u.If(v_Indicator == 1,
        Category.Indexes.IndexOf(Category.SortByCategoryID), 
        Category.Indexes.IndexOf(Category.SortByCategoryName))]);
} 

Development post migration

In new code that we'll write after the migration we can write this with much easier syntax.

First - we don't need the index stuff - the IndexOf method is backward compatible to '1'Key in magic or the '1'Index in unipaas/xpa. So this can be written:

protected override void OnLoad()
{
    OrderBy = u.If(v_Indicator == 1,Category.SortByCategoryID, Category.SortByCategoryName);
} 

Also - I would much rather use an If statement:

protected override void OnLoad()
{
    if(v_Indicator == 1)
        OrderBy = Category.SortByCategoryID; 
    else
        OrderBy = Category.SortByCategoryName;
} 

In some cases - you can also use a switch Statement:

protected override void OnLoad()
{
    switch((int)v_Indicator)
    {
        case 1:
            OrderBy = Category.SortByCategoryID; 
            break;
        default:
            OrderBy = Category.SortByCategoryName;
            break;
    }
} 

You can also do the same with the BindOrderBy method for UIControllers

First - we don't need the index stuff - the IndexOf method is backward compatible to '1'Key in magic or the '1'Index in unipaas/xpa. So this can be written:

protected override void InitializeDataView()
{
    BindOrderBy(() => u.If(v_Indicator == 1,Category.SortByCategoryID, Category.SortByCategoryName));
} 

Also - I would much rather use an If statement:

protected override void InitializeDataView()
{
    BindOrderBy(() => 
        {
           if(v_Indicator == 1)
               return Category.SortByCategoryID; 
           else
               return Category.SortByCategoryName;
        });
} 

In some cases - you can also use a Switch Statement:

protected override void InitializeDataView()
{
    BindOrderBy(() => 
        {
           switch((int)v_Indicator)
           {
               case 1:
                   return Category.SortByCategoryID; 
                   break;
               default:
                   return Category.SortByCategoryName;
                   break;
           }
        });
} 

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See Also:

• UIController OrderBy
• BusinessProcess OrderBy

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