ErrorProvider クラス
フォーム上のコントロールにエラーが関連付けられていることを示すための、ユーザー インターフェイスを提供します。
この型のすべてのメンバの一覧については、ErrorProvider メンバ を参照してください。
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.ErrorProvider
Public Class ErrorProvider
Inherits Component
Implements IExtenderProvider
[C#]
public class ErrorProvider : Component, IExtenderProvider
[C++]
public __gc class ErrorProvider : public Component,
IExtenderProvider
[JScript]
public class ErrorProvider extends Component implements
IExtenderProvider
スレッドセーフ
この型の public static (Visual Basicでは Shared) のすべてのメンバは、マルチスレッド操作で安全に使用できます。インスタンスのメンバの場合は、スレッドセーフであるとは限りません。
解説
ErrorProvider は、フォーム上のコントロールにエラーが関連付けられていることをエンド ユーザーに示すための、単純な機構を表します。コントロールに対してエラーを説明する文字列が指定されている場合、そのコントロールの横にアイコンが表示されます。このアイコンは、 BlinkStyle で指定された方法で、 BlinkRate で指定された速度で点滅します。マウスがアイコン上を移動すると、エラーを説明する文字列を示したツール ヒントが表示されます。
通常、データ連結コントロールと関連付けて ErrorProvider を使用します。 ErrorProvider をデータ連結コントロールと関連付けて使用する場合、 ContainerControl を、コンストラクタで指定するか、 ContainerControl プロパティを設定することによって指定する必要があります。
使用例
[Visual Basic, C#, C++] ErrorProvider クラスを使用して、データ入力エラーをユーザーに通知する方法を次の例に示します。 TextBox コントロール、 NumericUpDown コントロール、および ComboBox コントロールが配置された Form を作成する例を次に示します。内容の検証は各コントロールで実行し、各コントロールの ErrorProvider も作成します。 BlinkRate プロパティと BlinkStyle プロパティ、および SetIconAlignment メソッドと SetIconPadding メソッドを使用してエラー アイコンのオプションを設定する例を次に示します。 SetError メソッドは、コントロールの内容に応じて、コントロールの Validated イベント時に、適切なエラー テキスト付きまたはエラー テキストなしで呼び出されます。
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Namespace ErrorProvider
Public NotInheritable Class Form1
Inherits System.Windows.Forms.Form
Private label1 As System.Windows.Forms.Label
Private label2 As System.Windows.Forms.Label
Private label3 As System.Windows.Forms.Label
Private label4 As System.Windows.Forms.Label
Private label5 As System.Windows.Forms.Label
Private label6 As System.Windows.Forms.Label
Friend WithEvents favoriteColorComboBox As System.Windows.Forms.ComboBox
Friend WithEvents nameTextBox1 As System.Windows.Forms.TextBox
Friend WithEvents ageUpDownPicker As System.Windows.Forms.NumericUpDown
Private ageErrorProvider As System.Windows.Forms.ErrorProvider
Private nameErrorProvider As System.Windows.Forms.ErrorProvider
Private favoriteColorErrorProvider As System.Windows.Forms.ErrorProvider
<System.STAThread()> _
Public Shared Sub Main()
System.Windows.Forms.Application.Run(New Form1())
End Sub 'Main
Public Sub New()
Me.nameTextBox1 = New System.Windows.Forms.TextBox()
Me.label1 = New System.Windows.Forms.Label()
Me.label2 = New System.Windows.Forms.Label()
Me.ageUpDownPicker = New System.Windows.Forms.NumericUpDown()
Me.favoriteColorComboBox = New System.Windows.Forms.ComboBox()
Me.label3 = New System.Windows.Forms.Label()
Me.label4 = New System.Windows.Forms.Label()
Me.label5 = New System.Windows.Forms.Label()
Me.label6 = New System.Windows.Forms.Label()
' Name Label
Me.label1.Location = New System.Drawing.Point(56, 32)
Me.label1.Size = New System.Drawing.Size(40, 23)
Me.label1.Text = "Name:"
' Age Label
Me.label2.Location = New System.Drawing.Point(40, 64)
Me.label2.Size = New System.Drawing.Size(56, 23)
Me.label2.Text = "Age (3-5)"
' Favorite Color Label
Me.label3.Location = New System.Drawing.Point(24, 96)
Me.label3.Size = New System.Drawing.Size(80, 24)
Me.label3.Text = "Favorite color"
' ErrorBlinkStyle.AlwaysBlink Label
Me.label4.Location = New System.Drawing.Point(264, 32)
Me.label4.Size = New System.Drawing.Size(160, 23)
Me.label4.Text = "ErrorBlinkStyle.AlwaysBlink"
' ErrorBlinkStyle.BlinkIfDifferentError Label
Me.label5.Location = New System.Drawing.Point(264, 64)
Me.label5.Size = New System.Drawing.Size(200, 23)
Me.label5.Text = "ErrorBlinkStyle.BlinkIfDifferentError"
' ErrorBlinkStyle.NeverBlink Label
Me.label6.Location = New System.Drawing.Point(264, 96)
Me.label6.Size = New System.Drawing.Size(200, 23)
Me.label6.Text = "ErrorBlinkStyle.NeverBlink"
' Name TextBox
Me.nameTextBox1.Location = New System.Drawing.Point(112, 32)
Me.nameTextBox1.Size = New System.Drawing.Size(120, 20)
Me.nameTextBox1.TabIndex = 0
' Age NumericUpDown
Me.ageUpDownPicker.Location = New System.Drawing.Point(112, 64)
Me.ageUpDownPicker.Maximum = New System.Decimal(New Integer() {150, 0, 0, 0})
Me.ageUpDownPicker.TabIndex = 4
' Favorite Color ComboBox
Me.favoriteColorComboBox.Items.AddRange(New Object() {"None", "Red", "Yellow", _
"Green", "Blue", "Purple"})
Me.favoriteColorComboBox.Location = New System.Drawing.Point(112, 96)
Me.favoriteColorComboBox.Size = New System.Drawing.Size(120, 21)
Me.favoriteColorComboBox.TabIndex = 5
' Set up how the form should be displayed and add the controls to the form.
Me.ClientSize = New System.Drawing.Size(464, 150)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.label6, Me.label5, Me.label4, _
Me.label3, Me.favoriteColorComboBox, Me.ageUpDownPicker, Me.label2, _
Me.label1, Me.nameTextBox1})
Me.Text = "Error Provider Example"
' Create and set the ErrorProvider for each data entry control.
nameErrorProvider = New System.Windows.Forms.ErrorProvider()
nameErrorProvider.SetIconAlignment(Me.nameTextBox1, ErrorIconAlignment.MiddleRight)
nameErrorProvider.SetIconPadding(Me.nameTextBox1, 2)
nameErrorProvider.BlinkRate = 1000
nameErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.AlwaysBlink
ageErrorProvider = New System.Windows.Forms.ErrorProvider()
ageErrorProvider.SetIconAlignment(Me.ageUpDownPicker, ErrorIconAlignment.MiddleRight)
ageErrorProvider.SetIconPadding(Me.ageUpDownPicker, 2)
ageErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.BlinkIfDifferentError
favoriteColorErrorProvider = New System.Windows.Forms.ErrorProvider()
favoriteColorErrorProvider.SetIconAlignment(Me.ageUpDownPicker, ErrorIconAlignment.MiddleRight)
favoriteColorErrorProvider.SetIconPadding(Me.ageUpDownPicker, 2)
favoriteColorErrorProvider.BlinkRate = 1000
favoriteColorErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.NeverBlink
End Sub 'New
Private Sub nameTextBox1_Validated(sender As Object, e As System.EventArgs) Handles nameTextBox1.Validated
If IsNameValid() Then
' Clear the error, if any, in the error provider.
nameErrorProvider.SetError(Me.nameTextBox1, "")
Else
' Set the error if the name is not valid.
nameErrorProvider.SetError(Me.nameTextBox1, "Name is required.")
End If
End Sub
Private Sub ageUpDownPicker_Validated(sender As Object, e As System.EventArgs) Handles ageUpDownPicker.Validated
If IsAgeTooYoung() Then
' Set the error if the age is too young.
ageErrorProvider.SetError(Me.ageUpDownPicker, "Age not old enough")
ElseIf IsAgeTooOld() Then
' Set the error if the age is too old.
ageErrorProvider.SetError(Me.ageUpDownPicker, "Age is too old")
Else
' Clear the error, if any, in the error provider.
ageErrorProvider.SetError(Me.ageUpDownPicker, "")
End If
End Sub
Private Sub favoriteColorComboBox_Validated(sender As Object, e As System.EventArgs) Handles favoriteColorComboBox.Validated
If Not IsColorValid() Then
' Set the error if the favorite color is not valid.
favoriteColorErrorProvider.SetError(Me.favoriteColorComboBox, "Must select a color.")
Else
' Clear the error, if any, in the error provider.
favoriteColorErrorProvider.SetError(Me.favoriteColorComboBox, "")
End If
End Sub
' Functions to verify data.
Private Function IsNameValid() As Boolean
' Determine whether the text box contains a zero-length string.
Return nameTextBox1.Text.Length > 0
End Function
Private Function IsAgeTooYoung() As Boolean
' Determine whether the age value is less than three.
Return ageUpDownPicker.Value < 3
End Function
Private Function IsAgeTooOld() As Boolean
' Determine whether the age value is greater than five.
Return ageUpDownPicker.Value > 5
End Function
Private Function IsColorValid() As Boolean
' Determine whether the favorite color has a valid value.
If Not (favoriteColorComboBox.SelectedItem Is Nothing) Then
If Not(favoriteColorComboBox.SelectedItem.ToString().Equals("None")) Then
Return true
End If
End If
Return false
End Function
End Class 'Form1
End Namespace 'ErrorProvider
[C#]
using System;
using System.Drawing;
using System.Windows.Forms;
namespace ErrorProvider
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label label5;
private System.Windows.Forms.Label label6;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox nameTextBox1;
private System.Windows.Forms.NumericUpDown ageUpDownPicker;
private System.Windows.Forms.ComboBox favoriteColorComboBox;
private System.Windows.Forms.ErrorProvider ageErrorProvider;
private System.Windows.Forms.ErrorProvider nameErrorProvider;
private System.Windows.Forms.ErrorProvider favoriteColorErrorProvider;
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
public Form1()
{
this.nameTextBox1 = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.ageUpDownPicker = new System.Windows.Forms.NumericUpDown();
this.favoriteColorComboBox = new System.Windows.Forms.ComboBox();
this.label3 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
this.label5 = new System.Windows.Forms.Label();
this.label6 = new System.Windows.Forms.Label();
// Name Label
this.label1.Location = new System.Drawing.Point(56, 32);
this.label1.Size = new System.Drawing.Size(40, 23);
this.label1.Text = "Name:";
// Age Label
this.label2.Location = new System.Drawing.Point(40, 64);
this.label2.Size = new System.Drawing.Size(56, 23);
this.label2.Text = "Age (3-5)";
// Favorite Color Label
this.label3.Location = new System.Drawing.Point(24, 96);
this.label3.Size = new System.Drawing.Size(80, 24);
this.label3.Text = "Favorite color";
// ErrorBlinkStyle.AlwaysBlink Label
this.label4.Location = new System.Drawing.Point(264, 32);
this.label4.Size = new System.Drawing.Size(160, 23);
this.label4.Text = "ErrorBlinkStyle.AlwaysBlink";
// ErrorBlinkStyle.BlinkIfDifferentError Label
this.label5.Location = new System.Drawing.Point(264, 64);
this.label5.Size = new System.Drawing.Size(200, 23);
this.label5.Text = "ErrorBlinkStyle.BlinkIfDifferentError";
// ErrorBlinkStyle.NeverBlink Label
this.label6.Location = new System.Drawing.Point(264, 96);
this.label6.Size = new System.Drawing.Size(200, 23);
this.label6.Text = "ErrorBlinkStyle.NeverBlink";
// Name TextBox
this.nameTextBox1.Location = new System.Drawing.Point(112, 32);
this.nameTextBox1.Size = new System.Drawing.Size(120, 20);
this.nameTextBox1.TabIndex = 0;
this.nameTextBox1.Validated += new System.EventHandler(this.nameTextBox1_Validated);
// Age NumericUpDown
this.ageUpDownPicker.Location = new System.Drawing.Point(112, 64);
this.ageUpDownPicker.Maximum = new System.Decimal(new int[] {150,0,0,0});
this.ageUpDownPicker.TabIndex = 4;
this.ageUpDownPicker.Validated += new System.EventHandler(this.ageUpDownPicker_Validated);
// Favorite Color ComboBox
this.favoriteColorComboBox.Items.AddRange(new object[] {"None","Red","Yellow",
"Green","Blue","Purple"});
this.favoriteColorComboBox.Location = new System.Drawing.Point(112, 96);
this.favoriteColorComboBox.Size = new System.Drawing.Size(120, 21);
this.favoriteColorComboBox.TabIndex = 5;
this.favoriteColorComboBox.Validated += new System.EventHandler(this.favoriteColorComboBox_Validated);
// Set up how the form should be displayed and add the controls to the form.
this.ClientSize = new System.Drawing.Size(464, 150);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label6,this.label5,this.label4,this.label3,
this.favoriteColorComboBox,this.ageUpDownPicker,
this.label2,this.label1,this.nameTextBox1});
this.Text = "Error Provider Example";
// Create and set the ErrorProvider for each data entry control.
nameErrorProvider = new System.Windows.Forms.ErrorProvider();
nameErrorProvider.SetIconAlignment (this.nameTextBox1, ErrorIconAlignment.MiddleRight);
nameErrorProvider.SetIconPadding (this.nameTextBox1, 2);
nameErrorProvider.BlinkRate = 1000;
nameErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.AlwaysBlink;
ageErrorProvider = new System.Windows.Forms.ErrorProvider();
ageErrorProvider.SetIconAlignment (this.ageUpDownPicker, ErrorIconAlignment.MiddleRight);
ageErrorProvider.SetIconPadding (this.ageUpDownPicker, 2);
ageErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.BlinkIfDifferentError;
favoriteColorErrorProvider = new System.Windows.Forms.ErrorProvider();
favoriteColorErrorProvider.SetIconAlignment (this.ageUpDownPicker, ErrorIconAlignment.MiddleRight);
favoriteColorErrorProvider.SetIconPadding (this.ageUpDownPicker, 2);
favoriteColorErrorProvider.BlinkRate = 1000;
favoriteColorErrorProvider.BlinkStyle = System.Windows.Forms.ErrorBlinkStyle.NeverBlink;
}
private void nameTextBox1_Validated(object sender, System.EventArgs e)
{
if(IsNameValid())
{
// Clear the error, if any, in the error provider.
nameErrorProvider.SetError(this.nameTextBox1, "");
}
else
{
// Set the error if the name is not valid.
nameErrorProvider.SetError(this.nameTextBox1, "Name is required.");
}
}
private void ageUpDownPicker_Validated(object sender, System.EventArgs e)
{
if (IsAgeTooYoung())
{
// Set the error if the age is too young.
ageErrorProvider.SetError(this.ageUpDownPicker, "Age not old enough");
}
else if (IsAgeTooOld())
{
// Set the error if the age is too old.
ageErrorProvider.SetError(this.ageUpDownPicker, "Age is too old");
}
else
{
// Clear the error, if any, in the error provider.
ageErrorProvider.SetError(this.ageUpDownPicker, "");
}
}
private void favoriteColorComboBox_Validated(object sender, System.EventArgs e)
{
if (!IsColorValid())
{
// Set the error if the favorite color is not valid.
favoriteColorErrorProvider.SetError(this.favoriteColorComboBox, "Must select a color.");
}
else
{
// Clear the error, if any, in the error provider.
favoriteColorErrorProvider.SetError(this.favoriteColorComboBox, "");
}
}
// Functions to verify data.
private bool IsNameValid()
{
// Determine whether the text box contains a zero-length string.
return (nameTextBox1.Text.Length > 0);
}
private bool IsAgeTooYoung()
{
// Determine whether the age value is less than three.
return (ageUpDownPicker.Value < 3);
}
private bool IsAgeTooOld()
{
// Determine whether the age value is greater than five.
return (ageUpDownPicker.Value > 5 );
}
private bool IsColorValid()
{
// Determine whether the favorite color has a valid value.
return ((favoriteColorComboBox.SelectedItem != null) &&
(!favoriteColorComboBox.SelectedItem.ToString().Equals("None")));
}
}
}
[C++]
#using <mscorlib.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
public __gc class Form1 : public System::Windows::Forms::Form {
private:
System::Windows::Forms::Label* label1;
System::Windows::Forms::Label* label2;
System::Windows::Forms::Label* label4;
System::Windows::Forms::Label* label5;
System::Windows::Forms::Label* label6;
System::Windows::Forms::Label* label3;
System::Windows::Forms::TextBox* nameTextBox1;
System::Windows::Forms::NumericUpDown* ageUpDownPicker;
System::Windows::Forms::ComboBox* favoriteColorComboBox;
System::Windows::Forms::ErrorProvider* ageErrorProvider;
System::Windows::Forms::ErrorProvider* nameErrorProvider;
System::Windows::Forms::ErrorProvider* favoriteColorErrorProvider;
public:
Form1() {
this->nameTextBox1 = new System::Windows::Forms::TextBox();
this->label1 = new System::Windows::Forms::Label();
this->label2 = new System::Windows::Forms::Label();
this->ageUpDownPicker = new System::Windows::Forms::NumericUpDown();
this->favoriteColorComboBox = new System::Windows::Forms::ComboBox();
this->label3 = new System::Windows::Forms::Label();
this->label4 = new System::Windows::Forms::Label();
this->label5 = new System::Windows::Forms::Label();
this->label6 = new System::Windows::Forms::Label();
// Name Label
this->label1->Location = System::Drawing::Point(56, 32);
this->label1->Size = System::Drawing::Size(40, 23);
this->label1->Text = S"Name:";
// Age Label
this->label2->Location = System::Drawing::Point(40, 64);
this->label2->Size = System::Drawing::Size(56, 23);
this->label2->Text = S"Age (3-5)";
// Favorite Color Label
this->label3->Location = System::Drawing::Point(24, 96);
this->label3->Size = System::Drawing::Size(80, 24);
this->label3->Text = S"Favorite color";
// ErrorBlinkStyle::AlwaysBlink Label
this->label4->Location = System::Drawing::Point(264, 32);
this->label4->Size = System::Drawing::Size(160, 23);
this->label4->Text = S"ErrorBlinkStyle::AlwaysBlink";
// ErrorBlinkStyle::BlinkIfDifferentError Label
this->label5->Location = System::Drawing::Point(264, 64);
this->label5->Size = System::Drawing::Size(200, 23);
this->label5->Text = S"ErrorBlinkStyle::BlinkIfDifferentError";
// ErrorBlinkStyle::NeverBlink Label
this->label6->Location = System::Drawing::Point(264, 96);
this->label6->Size = System::Drawing::Size(200, 23);
this->label6->Text = S"ErrorBlinkStyle::NeverBlink";
// Name TextBox
this->nameTextBox1->Location = System::Drawing::Point(112, 32);
this->nameTextBox1->Size = System::Drawing::Size(120, 20);
this->nameTextBox1->TabIndex = 0;
this->nameTextBox1->Validated += new System::EventHandler(this, &Form1::nameTextBox1_Validated);
// Age NumericUpDown
this->ageUpDownPicker->Location = System::Drawing::Point(112, 64);
int temp0 __gc [] = {150, 0, 0, 0};
this->ageUpDownPicker->Maximum = System::Decimal(temp0);
this->ageUpDownPicker->TabIndex = 4;
this->ageUpDownPicker->Validated += new System::EventHandler(this, &Form1::ageUpDownPicker_Validated);
// Favorite Color ComboBox
Object* temp1 [] = {S"None", S"Red", S"Yellow", S"Green", S"Blue", S"Purple"};
this->favoriteColorComboBox->Items->AddRange(temp1);
this->favoriteColorComboBox->Location = System::Drawing::Point(112, 96);
this->favoriteColorComboBox->Size = System::Drawing::Size(120, 21);
this->favoriteColorComboBox->TabIndex = 5;
this->favoriteColorComboBox->Validated += new System::EventHandler(this, &Form1::favoriteColorComboBox_Validated);
// Set up how the form should be displayed and add the controls to the form.
this->ClientSize = System::Drawing::Size(464, 150);
System::Windows::Forms::Control* temp2 [] = {this->label6, this->label5, this->label4, this->label3,
this->favoriteColorComboBox, this->ageUpDownPicker,
this->label2, this->label1, this->nameTextBox1};
this->Controls->AddRange(temp2);
this->Text = S"Error Provider Example";
// Create and set the ErrorProvider for each data entry control.
nameErrorProvider = new System::Windows::Forms::ErrorProvider();
nameErrorProvider->SetIconAlignment (this->nameTextBox1, ErrorIconAlignment::MiddleRight);
nameErrorProvider->SetIconPadding (this->nameTextBox1, 2);
nameErrorProvider->BlinkRate = 1000;
nameErrorProvider->BlinkStyle = System::Windows::Forms::ErrorBlinkStyle::AlwaysBlink;
ageErrorProvider = new System::Windows::Forms::ErrorProvider();
ageErrorProvider->SetIconAlignment (this->ageUpDownPicker, ErrorIconAlignment::MiddleRight);
ageErrorProvider->SetIconPadding (this->ageUpDownPicker, 2);
ageErrorProvider->BlinkStyle = System::Windows::Forms::ErrorBlinkStyle::BlinkIfDifferentError;
favoriteColorErrorProvider = new System::Windows::Forms::ErrorProvider();
favoriteColorErrorProvider->SetIconAlignment (this->ageUpDownPicker, ErrorIconAlignment::MiddleRight);
favoriteColorErrorProvider->SetIconPadding (this->ageUpDownPicker, 2);
favoriteColorErrorProvider->BlinkRate = 1000;
favoriteColorErrorProvider->BlinkStyle = System::Windows::Forms::ErrorBlinkStyle::NeverBlink;
}
private:
void nameTextBox1_Validated(Object* /*sender*/, System::EventArgs* /*e*/) {
if (IsNameValid()) {
// Clear the error, if any, in the error provider.
nameErrorProvider->SetError(this->nameTextBox1, S"");
} else {
// Set the error if the name is not valid.
nameErrorProvider->SetError(this->nameTextBox1, S"Name is required.");
}
}
void ageUpDownPicker_Validated(Object* /*sender*/, System::EventArgs* /*e*/) {
if (IsAgeTooYoung()) {
// Set the error if the age is too young.
ageErrorProvider->SetError(this->ageUpDownPicker, S"Age not old enough");
} else if (IsAgeTooOld()) {
// Set the error if the age is too old.
ageErrorProvider->SetError(this->ageUpDownPicker, S"Age is too old");
} else {
// Clear the error, if any, in the error provider.
ageErrorProvider->SetError(this->ageUpDownPicker, S"");
}
}
void favoriteColorComboBox_Validated(Object* /*sender*/, System::EventArgs* /*e*/) {
if (!IsColorValid()) {
// Set the error if the favorite color is not valid.
favoriteColorErrorProvider->SetError(this->favoriteColorComboBox, S"Must select a color.");
} else {
// Clear the error, if any, in the error provider.
favoriteColorErrorProvider->SetError(this->favoriteColorComboBox, S"");
}
}
// Functions to verify data.
bool IsNameValid() {
// Determine whether the text box contains a zero-length String*.
return (nameTextBox1->Text->Length > 0);
}
bool IsAgeTooYoung() {
// Determine whether the age value is less than three.
return (ageUpDownPicker->Value < 3);
}
bool IsAgeTooOld() {
// Determine whether the age value is greater than five.
return (ageUpDownPicker->Value > 5);
}
bool IsColorValid() {
// Determine whether the favorite color has a valid value.
return ((favoriteColorComboBox->SelectedItem != 0) &&
(!favoriteColorComboBox->SelectedItem->Equals(S"None")));
}
};
[STAThread]
int main() {
Application::Run(new Form1());
}
[Visual Basic, C#, C++] DataSource および DataMember と併せて ErrorProvider を使用し、データ エラーをユーザーに提示する例を次に示します。
Private Sub InitializeComponent()
' Standard control setup.
'....
' You set the DataSource to a data set, and the DataMember to a table.
errorProvider1.DataSource = dataSet1
errorProvider1.DataMember = dataTable1.TableName
errorProvider1.ContainerControl = Me
errorProvider1.BlinkRate = 200
End Sub 'InitializeComponent
'...
' Since the ErrorProvider control does not have a visible component,
' it does not need to be added to the form.
Protected Sub buttonSave_Click(sender As Object, e As System.EventArgs)
' Checks for a bad post code.
Dim CustomersTable As DataTable
CustomersTable = customersDataSet1.Tables("Customers")
Dim row As DataRow
For Each row In CustomersTable.Rows
If Convert.ToBoolean(row("PostalCodeIsNull")) Then
row.RowError = "The Customer details contain errors"
row.SetColumnError("PostalCode", "Postal Code required")
End If
Next row
End Sub 'buttonSave_Click
[C#]
private void InitializeComponent()
{
// Standard control setup.
//....
// You set the DataSource to a data set, and the DataMember to a table.
errorProvider1.DataSource = dataSet1 ;
errorProvider1.DataMember = dataTable1.TableName ;
errorProvider1.ContainerControl = this ;
errorProvider1.BlinkRate = 200 ;
//...
// Since the ErrorProvider control does not have a visible component,
// it does not need to be added to the form.
}
protected void buttonSave_Click(object sender, System.EventArgs e)
{
// Checks for a bad post code.
DataTable CustomersTable;
CustomersTable = customersDataSet1.Tables["Customers"];
foreach (DataRow row in (CustomersTable.Rows))
{
if (Convert.ToBoolean(row["PostalCodeIsNull"]))
{
row.RowError="The Customer details contain errors";
row.SetColumnError("PostalCode", "Postal Code required");
}
}
}
[C++]
private:
void InitializeComponent()
{
// Standard control setup.
//....
// You set the DataSource to a data set, and the DataMember to a table.
errorProvider1->DataSource = dataSet1 ;
errorProvider1->DataMember = dataTable1->TableName ;
errorProvider1->ContainerControl = this ;
errorProvider1->BlinkRate = 200 ;
//...
// Since the ErrorProvider control does not have a visible component,
// it does not need to be added to the form.
}
protected:
void buttonSave_Click(Object* /*sender*/, System::EventArgs* /*e*/)
{
// Checks for a bad post code.
DataTable* CustomersTable;
CustomersTable = customersDataSet1->Tables->Item[S"Customers"];
System::Collections::IEnumerator* myEnum = (CustomersTable->Rows)->GetEnumerator();
while (myEnum->MoveNext())
{
DataRow* row = __try_cast<DataRow*>(myEnum->Current);
if (Convert::ToBoolean(row->Item[S"PostalCodeIsNull"]))
{
row->RowError=S"The Customer details contain errors";
row->SetColumnError(S"PostalCode", S"Postal Code required");
}
}
}
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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
アセンブリ: System.Windows.Forms (System.Windows.Forms.dll 内)