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PickerColumn Class

A grid column that allows a user to edit a cell value by selecting an item from the predefined set.

Namespace: DevExpress.XamarinForms.DataGrid

Assembly: DevExpress.XamarinForms.Grid.dll

Declaration

public class PickerColumn :
    TextColumn

Examples

This example shows how to create columns in DataGridView to display and edit data of different types. The grid is bound to a collection of Employee objects. Each Employee object contains an employee's photo (image), name, position, phone, address (strings), hire and birth dates (DateTime values), employee's access level (enumeration value), and a Boolean value indicating whether an employee is on vacation.

Grid Columns

Add the following columns to the DataGridView.Columns collection:

Grid Column

Description

Photo

ImageColumn

This column displays photos of employees (images added to a project as embedded resources).

Employee

TemplateColumn

This column displays names, positions and hire dates of employees.

Assign a template to the TemplateColumn.DisplayTemplate property to define the presentation of column cells. Each cell contains a Xamarin.Forms.Grid with three Xamarin.Forms.Label elements bound to the Name, Position and HireDate properties of the Employee class.

The CellData object specifies a data context (binding source) for a cell template. Its CellData.Value property provides access to a value of a data field assigned to the column's GridColumn.FieldName property. In this example, a column cell displays not only this field value but also the values of two more fields. Use the CellData.Source property to access the whole data row object (Employee) and bind its properties to properties of labels defined in the template.

Use the GridColumn.AllowSort and GridColumn.IsReadOnly properties to prevent end users from sorting data by this column and disable data editing.

Phone

NumberColumn

This column is bound to the Phone property of the string type. The keyboard for text input appears when a user activates a cell in this column to edit an employee's phone.

Address

TextColumn

This column is bound to the Address property of the string type. The keyboard for text input appears when a user activates a cell in this column to edit an employee's address.

Birth Date

DateColumn

This column displays birth days of employees and allows end users to edit dates. The GridColumn.DisplayFormat property specifies the date display format.

Access Level

PickerColumn

The AccessLevel enumeration lists values (Admin or User) that specify the employee's Access property. In a picker column, a user can select between predefined values to change an employee's access level.

On Vacation

SwitchColumn

This column is bound to the employee's OnVacation property of the Boolean type. A switch column allows a user to select between two states when editing cell values.

using System;
using Xamarin.Forms;
using System.Collections.ObjectModel;

namespace GridColumns.Models {
    public enum AccessLevel {
        Admin,
        User
    }

    public class Employee {
        string name;
        string resourceName;

        public string Name {
            get { return name; }
            set {
                name = value;
                if (Photo == null) {
                    resourceName = "GridColumns.Images." + value.Replace(" ", "_") + ".jpg";
                    if (!String.IsNullOrEmpty(resourceName))
                    Photo = ImageSource.FromResource(resourceName);
                }
            }
        }

        public Employee(string name) {
            this.Name = name;
        }

        public ImageSource Photo { get; set; }
        public DateTime BirthDate { get; set; }
        public DateTime HireDate { get; set; }
        public string Position { get; set; }
        public string Address { get; set; }
        public string Phone { get; set; }
        public AccessLevel Access { get; set; }
        public bool OnVacation { get; set; }
    }

    public class EmployeeData {
        void GenerateEmployees() {
            ObservableCollection<Employee> result = new ObservableCollection<Employee>();
            result.Add(
                new Employee("Nancy Davolio") {
                    BirthDate = new DateTime(1978, 12, 8),
                    HireDate = new DateTime(2005, 5, 1),
                    Position = "Sales Representative",
                    Address = "98122, 507 - 20th Ave. E. Apt. 2A, Seattle WA, USA",
                    Phone = "(206) 555-9857",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Andrew Fuller") {
                    BirthDate = new DateTime(1965, 2, 19),
                    HireDate = new DateTime(1992, 8, 14),
                    Position = "Vice President, Sales",
                    Address = "98401, 908 W. Capital Way, Tacoma WA, USA",
                    Phone = "(206) 555-9482",
                    Access = AccessLevel.Admin,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Janet Leverling") {
                    BirthDate = new DateTime(1985, 8, 30),
                    HireDate = new DateTime(2002, 4, 1),
                    Position = "Sales Representative",
                    Address = "98033, 722 Moss Bay Blvd., Kirkland WA, USA",
                    Phone = "(206) 555-3412",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Margaret Peacock") {
                    BirthDate = new DateTime(1973, 9, 19),
                    HireDate = new DateTime(1993, 5, 3),
                    Position = "Sales Representative",
                    Address = "98052, 4110 Old Redmond Rd., Redmond WA, USA",
                    Phone = "(206) 555-8122",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Steven Buchanan") {
                    BirthDate = new DateTime(1955, 3, 4),
                    HireDate = new DateTime(1993, 10, 17),
                    Position = "Sales Manager",
                    Address = "SW1 8JR, 14 Garrett Hill, London, UK",
                    Phone = "(71) 555-4848",
                    Access = AccessLevel.User,
                    OnVacation = true
                }
            );
            result.Add(
                new Employee("Michael Suyama") {
                    BirthDate = new DateTime(1981, 7, 2),
                    HireDate = new DateTime(1999, 10, 17),
                    Position = "Sales Representative",
                    Address = "EC2 7JR, Coventry House Miner Rd., London, UK",
                    Phone = "(71) 555-7773",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Robert King") {
                    BirthDate = new DateTime(1960, 5, 29),
                    HireDate = new DateTime(1994, 1, 2),
                    Position = "Sales Representative",
                    Address = "RG1 9SP, Edgeham Hollow Winchester Way, London, UK",
                    Phone = "(71) 555-5598",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            result.Add(
                new Employee("Laura Callahan") {
                    BirthDate = new DateTime(1985, 1, 9),
                    HireDate = new DateTime(2004, 3, 5),
                    Position = "Inside Sales Coordinator",
                    Address = "98105, 4726 - 11th Ave. N.E., Seattle WA, USA",
                    Phone = "(206) 555-1189",
                    Access = AccessLevel.User,
                    OnVacation = true
                }
            );
            result.Add(
                new Employee("Anne Dodsworth") {
                    BirthDate = new DateTime(1980, 1, 27),
                    HireDate = new DateTime(2004, 11, 15),
                    Position = "Sales Representative",
                    Address = "WG2 7LT, 7 Houndstooth Rd., London, UK",
                    Phone = "(71) 555-4444",
                    Access = AccessLevel.User,
                    OnVacation = false
                }
            );
            Employees = result;
        }

        public ObservableCollection<Employee> Employees { get; private set; }

        public EmployeeData() {
            GenerateEmployees();
        }
    }
}

Inheritance

See Also