TextBox.AutoCompleteMode Property

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets an option that controls how automatic completion works for the TextBox.

public:
 property System::Windows::Forms::AutoCompleteMode AutoCompleteMode { System::Windows::Forms::AutoCompleteMode get(); void set(System::Windows::Forms::AutoCompleteMode value); };

[System.ComponentModel.Browsable(true)]
public System.Windows.Forms.AutoCompleteMode AutoCompleteMode { get; set; }

[<System.ComponentModel.Browsable(true)>]
member this.AutoCompleteMode : System.Windows.Forms.AutoCompleteMode with get, set

Public Property AutoCompleteMode As AutoCompleteMode

Property Value

AutoCompleteMode

One of the values of AutoCompleteMode. The following are the values.

Append Appends the remainder of the most likely candidate string to the existing characters, highlighting the appended characters.

Suggest Displays the auxiliary drop-down list associated with the edit control. This drop-down is populated with one or more suggested completion strings.

SuggestAppend Appends both Suggest and Append options.

None Disables automatic completion. This is the default.

Attributes: BrowsableAttribute

Exceptions

InvalidEnumArgumentException

The specified value is not one of the values of AutoCompleteMode.

Examples

The following code example demonstrates how to use a collection as the auto-complete custom source for a TextBox control. This example does the following:

Uses the AutoCompleteSource property to enable the TextBox control to accept a custom source for its auto-complete behavior.
Uses the AutoCompleteCustomSource property to set the custom list of values.
Uses the AutoCompleteMode property to set how the auto-complete candidates are displayed.

private void Form1_Load(object sender, EventArgs e)
{
    // Create the list to use as the custom source. 
    var source = new AutoCompleteStringCollection();
    source.AddRange(new string[]
                    {
                        "January",
                        "February",
                        "March",
                        "April",
                        "May",
                        "June",
                        "July",
                        "August",
                        "September",
                        "October",
                        "November",
                        "December"
                    });

    // Create and initialize the text box.
    var textBox = new TextBox
                  {
                      AutoCompleteCustomSource = source,
                      AutoCompleteMode = 
                          AutoCompleteMode.SuggestAppend,
                      AutoCompleteSource =
                          AutoCompleteSource.CustomSource,
                      Location = new Point(20, 20),
                      Width = ClientRectangle.Width - 40,
                      Visible = true
                  };

    // Add the text box to the form.
    Controls.Add(textBox);
}

Private Sub Form1_Load(ByVal sender As System.Object, _
                       ByVal e As System.EventArgs) Handles MyBase.Load

    ' Create the list to use as the custom source.
    Dim MySource As New AutoCompleteStringCollection()
    MySource.AddRange(New String() _
                        { _
                            "January", _
                            "February", _
                            "March", _
                            "April", _
                            "May", _
                            "June", _
                            "July", _
                            "August", _
                            "September", _
                            "October", _
                            "November", _
                            "December" _
                        })

    ' Create and initialize the text box.
    Dim MyTextBox As New TextBox()
    With MyTextBox
        .AutoCompleteCustomSource = MySource
        .AutoCompleteMode = AutoCompleteMode.SuggestAppend
        .AutoCompleteSource = AutoCompleteSource.CustomSource
        .Location = New Point(20, 20)
        .Width = Me.ClientRectangle.Width - 40
        .Visible = True
    End With

    ' Add the text box to the form.
    Me.Controls.Add(MyTextBox)
End Sub

Remarks

Use the AutoCompleteCustomSource, AutoCompleteMode, and AutoCompleteSource properties to create a TextBox that automatically completes input strings by comparing the prefix being entered to the prefixes of all strings in a maintained source. This is useful for TextBox controls in which URLs, addresses, file names, or commands will be frequently entered.

The use of the AutoCompleteCustomSource property is optional, but you must set the AutoCompleteSource property to CustomSource in order to use AutoCompleteCustomSource.

You must use the AutoCompleteMode and AutoCompleteSource properties together.

Note

The operating system might limit the number of custom strings that it can display at once.

Applies to

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