ComboBoxStyle 列挙体
ComboBox のスタイルを指定します。
<Serializable>
Public Enum ComboBoxStyle
[C#]
[Serializable]
public enum ComboBoxStyle
[C++]
[Serializable]
__value public enum ComboBoxStyle
[JScript]
public
Serializable
enum ComboBoxStyle
解説
DropDownStyle プロパティでは、ユーザーがテキスト部分に新しい値を入力できるかどうか、リスト部分が常に表示されているかどうかが決定されます。
メンバ
| メンバ名 | 説明 |
|---|---|
| DropDown | テキスト部分は編集できます。リスト部分を表示するには、矢印ボタンをクリックします。 |
| DropDownList
.NET Compact Framework でもサポート。 |
ユーザーはテキスト部分を直接編集できません。リスト部分を表示するには、矢印ボタンをクリックします。 |
| Simple | テキスト部分は編集できます。リスト部分は常に表示されます。 |
使用例
[Visual Basic, C#] ComboBoxStyle 列挙体の使用例を次に示します。この例を実行するには、TextBox1 という名前の TextBox オブジェクトが配置されているフォームに次のコードを貼り付けて、フォームのコンストラクタまたは Load メソッドから InitializeComboBox メソッドを呼び出します。
' Declare comboBox1 as a ComboBox.
Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
' This method initializes the combo box, adding a large string
' array but limiting the drop-down size to six rows so the combo box
' doesn't cover other controls when it expands.
Private Sub InitializeComboBox()
Me.ComboBox1 = New System.Windows.Forms.ComboBox
Dim employees() As String = New String() {"Hamilton, David", _
"Hensien, Kari", "Hammond, Maria", "Harris, Keith", _
"Henshaw, Jeff D.", "Hanson, Mark", "Harnpadoungsataya, Sariya", _
"Harrington, Mark", "Harris, Keith", "Hartwig, Doris", _
"Harui, Roger", "Hassall, Mark", "Hasselberg, Jonas", _
"Harnpadoungsataya, Sariya", "Henshaw, Jeff D.", "Henshaw, Jeff D.", _
"Hensien, Kari", "Harris, Keith", "Henshaw, Jeff D.", _
"Hensien, Kari", "Hasselberg, Jonas", "Harrington, Mark", _
"Hedlund, Magnus", "Hay, Jeff", "Heidepriem, Brandon D."}
ComboBox1.Items.AddRange(employees)
Me.ComboBox1.Location = New System.Drawing.Point(136, 32)
Me.ComboBox1.MaxDropDownItems = 5
Me.ComboBox1.DropDownStyle = ComboBoxStyle.DropDown
Me.ComboBox1.Name = "ComboBox1"
Me.ComboBox1.Size = New System.Drawing.Size(136, 81)
Me.ComboBox1.TabIndex = 0
Me.Controls.Add(Me.ComboBox1)
End Sub
. . .
' This method is called when the user changes his or her selection.
' It searches for all occurrences of the selected employee's
' name in the Items array and adds the employee's name and
' the number of occurrences to TextBox1.Text.
' CAUTION This code exposes a known bug: If the index passed to the
' FindStringExact(searchString, index) method is the last index
' of the array, the code throws an exception.
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Dim comboBox As comboBox = CType(sender, comboBox)
' Save the selected employee's name, because we will remove
' the employee's name from the list.
Dim selectedEmployee = CType(ComboBox1.SelectedItem, String)
Dim count As Integer = 0
Dim resultIndex As Integer = -1
' Call the FindStringExact method to find the first
' occurrence in the list.
resultIndex = ComboBox1.FindStringExact(ComboBox1.SelectedItem)
' Remove the name as it is found, and increment the found count.
' Then call the FindStringExact method again, passing in the index of the
' current found item so the search starts there instead of
' at the beginning of the list.
While (resultIndex <> -1)
ComboBox1.Items.RemoveAt(resultIndex)
count += 1
resultIndex = ComboBox1.FindStringExact _
(selectedEmployee, resultIndex)
End While
' Update the text in Textbox1.
TextBox1.Text = TextBox1.Text & Microsoft.VisualBasic.vbCrLf _
& selectedEmployee & ": " & count
End Sub
[C#]
// Declare comboBox1 as a ComboBox.
internal System.Windows.Forms.ComboBox ComboBox1;
// This method initializes the combo box, adding a large string array
// but limiting the drop-down size to six rows so the combo box doesn't
// cover other controls when it expands.
private void InitializeComboBox()
{
this.ComboBox1 = new System.Windows.Forms.ComboBox();
string[] employees = new string[]{"Hamilton, David", "Hensien, Kari",
"Hammond, Maria", "Harris, Keith", "Henshaw, Jeff D.",
"Hanson, Mark", "Harnpadoungsataya, Sariya",
"Harrington, Mark", "Harris, Keith", "Hartwig, Doris",
"Harui, Roger", "Hassall, Mark", "Hasselberg, Jonas",
"Harnpadoungsataya, Sariya", "Henshaw, Jeff D.",
"Henshaw, Jeff D.", "Hensien, Kari", "Harris, Keith",
"Henshaw, Jeff D.", "Hensien, Kari", "Hasselberg, Jonas",
"Harrington, Mark", "Hedlund, Magnus", "Hay, Jeff",
"Heidepriem, Brandon D."};
ComboBox1.Items.AddRange(employees);
this.ComboBox1.Location = new System.Drawing.Point(136, 32);
this.ComboBox1.MaxDropDownItems = 5;
this.ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
this.ComboBox1.Name = "ComboBox1";
this.ComboBox1.Size = new System.Drawing.Size(136, 81);
this.ComboBox1.TabIndex = 0;
this.Controls.Add(this.ComboBox1);
// Associate the event-handling method with the
// SelectedIndexChanged event.
this.ComboBox1.SelectedIndexChanged +=
new System.EventHandler(ComboBox1_SelectedIndexChanged);
}
. . .
// This method is called when the user changes his or her selection.
// It searches for all occurrences of the selected employee's
// name in the Items array and adds the employee's name and
// the number of occurrences to TextBox1.Text.
// CAUTION This code exposes a known bug: If the index passed to the
// FindStringExact(searchString, index) method is the last index
// of the array, the code throws an exception.
private void ComboBox1_SelectedIndexChanged(object sender,
System.EventArgs e)
{
ComboBox comboBox = (ComboBox) sender;
// Save the selected employee's name, because we will remove
// the employee's name from the list.
string selectedEmployee = (string) ComboBox1.SelectedItem;
int count = 0;
int resultIndex = -1;
// Call the FindStringExact method to find the first
// occurrence in the list.
resultIndex = ComboBox1.FindStringExact(selectedEmployee);
// Remove the name as it is found, and increment the found count.
// Then call the FindStringExact method again, passing in the
// index of the current found item so the search starts there
// instead of at the beginning of the list.
while (resultIndex!=-1)
{
ComboBox1.Items.RemoveAt(resultIndex);
count += 1;
resultIndex = ComboBox1.FindStringExact(selectedEmployee,
resultIndex);
}
// Update the text in Textbox1.
TextBox1.Text = TextBox1.Text+ "\r\n" + selectedEmployee + ": "
+ count;
}
[C++, JScript] C++ および JScript のサンプルはありません。Visual Basic および C# のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン .gif)
をクリックします。
必要条件
名前空間: System.Windows.Forms
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET
アセンブリ: System.Windows.Forms (System.Windows.Forms.dll 内)