Data Controllers / Framework

  Maximum Value Count

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Data Controllers / FrameworkPrint||
Maximum Value Count

Field samples, multi value filters, and search bar auto complete entries display up to 200 related lookup items.

Supplier Company Name multi value select with 29 items available for selection.

Let’s change the maximum number of lookup items displayed for Supplier Company Name of Products controller.

Start the web application generator. Click on the project name, and select Develop option. Visual Studio will start.

In the Solution Explorer, right-click 0n ~\App_Code folder, and select Add New Item.

Add New Item to AppCode folder of your web application. 

Select Class item from the list, and press Add.

Create a class in Microsoft Visual Studio.

Replace the entire sample content of the file with the following:


using System;
using System.Web;
namespace MyCompany.Data
    public partial class DistinctValueRequest
        public override int MaximumValueCount
                if (Controller == "Products")
                    if (FieldName == "SupplierCompanyName")
                        return 10;
                        return 20;
                return base.MaximumValueCount;
                base.MaximumValueCount = value;
Visual Basic:
Imports Microsoft.VisualBasic
Imports System
Imports System.Web

Namespace MyCompany.Data
    Partial Public Class DistinctValueRequest
        Public Overrides Property MaximumValueCount As Integer
                If Controller = "Products" Then
                    If FieldName = "SupplierCompanyName" Then
                        Return 10
                        Return 20
                    End If
                End If
                Return MyBase.MaximumValueCount
            End Get
            Set(value As Integer)
                MyBase.MaximumValueCount = value
            End Set
        End Property
    End Class
End Namespace

This class will instruct the application framework to use 20 distinct value samples for all fields in the Products controller with the exception of Supplier Company Name. The limit for Supplier Company Name is 10. No other controllers will be affected.

Save the class. On the keyboard, press Ctrl+F5 to start the web application. Navigate to the Products page.

Activate the Supplier Company Name header dropdown. Only the first 10 items will be available for selection.

10 samples displayed for Supplier Company Name filter.

Open the advanced search bar, and activate the Auto Complete dropdown for Supplier Company Name. Only 10 items will be displayed at one time.

Advanced Search Bar auto complete dropdown only shows 10 items.

The Multi Value Filter window will only display 10 items.

Supplier Company Name multi value filter only shows 10 items.

Other fields in the Products controller will display 20 distinct value samples, such as the Quantity Per Unit header dropdown.

Quantity Per Unit distinct value sampleshow only 20 items.