Combobox как добавить список

C# ComboBox Control

C# controls are located in the Toolbox of the development environment, and you use them to create objects on a form with a simple series of mouse clicks and dragging motions. A ComboBox displays a text box combined with a ListBox, which enables the user to select items from the list or enter a new value.

The user can type a value in the text field or click the button to display a drop down list. You can add individual objects with the Add method. You can delete items with the Remove method or clear the entire list with the Clear method.

How add a item to combobox

ComboBox SelectedItem

How to retrieve value from ComboBox

If you want to retrieve the displayed item to a string variable , you can code like this

How to remove an item from ComboBox

You can remove items from a combobox in two ways. You can remove item at a the specified index or giving a specified item by name.

The above code will remove the second item from the combobox.

The above code will remove the item «Friday» from the combobox.

DropDownStyle

The DropDownStyle property specifies whether the list is always displayed or whether the list is displayed in a drop-down. The DropDownStyle property also specifies whether the text portion can be edited.

ComboBox Selected Value

How to set the selected item in a comboBox

You can display selected item in a combobox in two ways.

ComboBox DataSource Property

How to populate a combo box with a DataSet ?

You can Programmatically Binding DataSource to ComboBox in a simple way..

Consider an sql string like. «select au_id,au_lname from authors»;

Make a datasource and bind it like the following.

Combobox SelectedIndexChanged event

The SelectedIndexChanged event of a combobox fire when you change the slected item in a combobox. If you want to do something when you change the selection, you can write the program on SelectedIndexChanged event. From the following code you can understand how to set values in the SelectedIndexChanged event of a combobox. Drag and drop two combobox on the Form and copy and paste the following source code.

ComboBox Databinding

You can bind data to a Combobox from various resources like Dataset, List, Enum, Dictionary etc. From the following link you can study more about . ComboBox Databinding

ComboBox Default Value

How to set a default value for a Combo Box

You can set combobox default value by using SelectedIndex property

Above code set 6th item as combobox default value

ComboBox readonly

How to make a combobox read only

You can make a ComboBox readonly, that means a user cannot write in a combo box but he can select the given items, in two ways. By default, DropDownStyle property of a Combobox is DropDown. In this case user can enter values to combobox. When you change the DropDownStyle property to DropDownList, the Combobox will become read only and user can not enter values to combobox. Second method, if you want the combobox completely read only, you can set comboBox1.Enabled = false.

Autocomplete ComboBox

From the latest version of Visual Studio, some of the controls support Autocomplete feature including the ComboBox controls. From the following link you can see how to make . Autocomplete ComboBox

ComboBox Example

The following C# source code add seven days in a week to a combo box while load event of a Windows Form and int Button click event it displays the selected text in the Combo Box.

Combobox как добавить список

you can use the following code

ArrayList s = new ArrayList();

this .comboBox2.DataSource = s;

this .comboBox2.DataSource = s;

this .comboBox2.DataSource = s;

• Proposed as answer by shivajani Monday, December 13, 2010 11:41 AM

I know that but i need

Combobox show | Select value
Blue 1

Sample de Listbox of the Visual Web Developer you can add items with (Value to show,value to select)

A ComboBox stores objects, not just strings. You can store your own object; override the ToString() method to generate the text the user will see. Here’s an example:

public partial class Form1 : Form <
// Content item for the combo box
private class Item <
public string Name;
public int Value;
public Item(string name, int value) <
Name = name; Value = value;
>
public override string ToString() <
// Generates the text shown in the combo box
return Name;
>
>
public Form1() <
InitializeComponent();
// Put some stuff in the combo box
comboBox1.Items.Add(new Item("Blue", 1));
comboBox1.Items.Add(new Item("Red", 2));
comboBox1.Items.Add(new Item("Nobugz", 666));
>

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) <
// Display the Value property
Item itm = (Item)comboBox1.SelectedItem;
Console.WriteLine("<0>, <1>", itm.Name, itm.Value);
>
>

What does it mean comboBox1.Items.Add(new Item("Blue", 1)); ? I know that Items.Add can add a new item to the list but (new Item("Blue",1)) I didn’t understand it. Please help me cuz I’m in need !! I want to add a new item but I wanna change the value instead BLUE I wanna to have 1..

Everything is possible, nothing is impossible. Just try and you will find that.

That’s a part of my code ::

MaConnexion.Open()
Dim MaCommande As New SqlCommand
Dim MonDataReader As SqlDataReader
MaCommande = MaConnexion.CreateCommand
MaCommande.CommandType = CommandType.StoredProcedure
MaCommande.CommandText = "SP_ListeGroupeParCentre"
MaCommande.Parameters.Add("@IdC", SqlDbType.Int).Value = IdCentre ‘ Don’t worry I have this integer !!
MonDataReader = MaCommande.ExecuteReader
Do While MonDataReader.Read
Cmb_NomG.Items.Add(New Item(MonDataReader("NomGroupe"), MonDataReader("IdGroupe")))
‘Cmb_NomG.Items.Add(MonDataReader("IdGroupe"))
‘Cmb_NomG.Items.Add(MonDataReader("NomGroupe"))
Loop
MonDataReader.Close()

Public Class Item
Public Name As String
Public Value As Integer
Public Sub New(N As String, V As Integer)
Name = N
Value = V
End Sub
Public Overrides Function ToString() As String
Return Value
End Function
End Class

Everything is possible, nothing is impossible. Just try and you will find that.

Как добавить элемент в ComboBox?

C# Выбранный элемент в comboBox добавить к тексту в этом же comboBox
Здравствуйте Есть один comboBox, в котором будет около 20 элементов в выпадающем списке. Нужно.

ComboBox. Как добавить нужный элемент к выбранному значению?
Добрый день. Перейду сразу к делу. Имеется ComboBox. Ему в store передается список кодов цветов.

Добавить элемент списка ComboBox из ComboBox’a
Такой вопрос: вот у меня есть комбобокс с возможностью ручного ввода. Как сделать так, чтобы.

Как добавить значения в ComboBox?
Создаю свою форму, там есть ComboBox. Когда пытаюсь добавить в него значения следующиум кодом.

Add items to comboBox in WPF

When I have added a comboBox to the WPF window, how do I add items to the comboBox? Int the XAML code for the design or in NameOfWindow.xaml.cs file?

7 Answers 7

CASE 1 — You don’t have a data-source:

You can just populate the ComboBox with static values as follows —

1. from XAML:

1. from CodeBehind — 1:

1. from CodeBehind — 2:

CASE 2 — You have a data-source, and the items never get changed:

You can use the data-source to populate the ComboBox . Any IEnumerable type can be used as a data-source. You can —

1. bind the ItemsSource property in XAML to the data-source like —

1. assign data-source to the ItemsSource property in the code-behind, like —

CASE 3 — You have a data-source, and the items might get changed

1. You should use an ObservableCollection<T> as the data-source
2. You should bind the ItemsSource property in XAML to the data-source (as shown above)
3. You can assign data-source to the ItemsSource property in the code-behind (as shown above)

Using an ObservableCollection<T> ensures that whenever an item is added to or removed from the data-source, the change will reflect immediately on the UI. It’s up to you how you populate the ObservableCollection<T> .