データソースに実装する検証

コントロールがデータソースに連結されている場合、データを表すエンティティクラスのプロパティに検証処理を実装する方法があります。

データソースに実装する検証

エンティティクラスに検証処理を実装する方法として他にも .NET の標準ライブラリで提供される IDataErrorInfo や INotifyDataErrorInfo インタフェースを使用して検証処理を実装する方法があります。

サンプルコード

次のサンプルコードは Employee クラスの ID プロパティに文字数の検証を実装します。なお、コントロールをデータソースに連結する方法について詳しくは「データ連結の基本」を参照してください。

XAML	コードのコピー
<sg:GcSpreadGrid ItemsSource="{StaticResource EmployeeCollection}"/>

Employee および EmployeeCollection クラス（C#）

C#	コードのコピー
public class Employee : INotifyPropertyChanged { string id; string name; DateTime hiredate; DateTime birthday; public string ID { set { if (value.Length > 9) throw new Exception("IDが10文字以上で長過ぎます。"); id = value; NotifyPropertyChanged("ID"); } get { return id; } } [Display(ShortName="氏名")] public string Name { set { name = value; NotifyPropertyChanged("Name"); } get { return name; } } [Display(ShortName = "入社日")] public DateTime HireDate { set { hiredate = value; NotifyPropertyChanged("HireDate"); } get { return hiredate; } } [Display(ShortName = "誕生日")] public DateTime Birthday { set { birthday = value; NotifyPropertyChanged("Birthday"); } get { return birthday; } } public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public class EmployeeCollection : ObservableCollection<Employee> { public EmployeeCollection() { Add(new Employee() { ID = "U10200115", Name = "福山敏道", HireDate = DateTime.Parse("2003/12/1"), Birthday=DateTime.Parse("1977/9/17")}); } }

コードのコピー

public class Employee : INotifyPropertyChanged
{
    string id;
    string name;      
    DateTime hiredate;
    DateTime birthday;       
    public string ID
    {
        set {
            if (value.Length > 9)
                throw new Exception("IDが10文字以上で長過ぎます。");
            id = value; NotifyPropertyChanged("ID");
        }
        get { return id; }
    }
    [Display(ShortName="氏名")]
    public string Name
    {
        set { name = value; NotifyPropertyChanged("Name"); }
        get { return name; }
    }
    [Display(ShortName = "入社日")]
    public DateTime HireDate
    {
        set { hiredate = value; NotifyPropertyChanged("HireDate"); }
        get { return hiredate; }
    }
    [Display(ShortName = "誕生日")]
    public DateTime Birthday
    {
        set { birthday = value; NotifyPropertyChanged("Birthday"); }
        get { return birthday; }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}
public class EmployeeCollection : ObservableCollection<Employee>
{
    public EmployeeCollection()
    {
        Add(new Employee() { ID = "U10200115", Name = "福山 敏道",
            HireDate = DateTime.Parse("2003/12/1"), Birthday=DateTime.Parse("1977/9/17")});           
    }
}

Employee および EmployeeCollection クラス（Visual Basic）

Visual Basic	コードのコピー
Public Class Employee Implements INotifyPropertyChanged Private m_id As String Private m_name As String Private m_hiredate As DateTime Private m_birthday As DateTime Public Property ID() As String Get Return m_id End Get Set(value As String) If value.Length > 9 Then Throw New Exception("IDが10文字以上で長過ぎます。") End If m_id = value NotifyPropertyChanged("ID") End Set End Property <Display(ShortName:="氏名")> _ Public Property Name() As String Get Return m_name End Get Set(value As String) m_name = value NotifyPropertyChanged("Name") End Set End Property <Display(ShortName:="入社日")> _ Public Property HireDate() As DateTime Get Return m_hiredate End Get Set(value As DateTime) m_hiredate = value NotifyPropertyChanged("HireDate") End Set End Property <Display(ShortName:="誕生日")> _ Public Property Birthday() As DateTime Get Return m_birthday End Get Set(value As DateTime) m_birthday = value NotifyPropertyChanged("Birthday") End Set End Property Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged Protected Sub NotifyPropertyChanged(propertyName As String) RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName)) End Sub End Class Public Class EmployeeCollection Inherits ObservableCollection(Of Employee) Public Sub New() Add(New Employee() With {.ID = "U10200115", .Name = "福山敏道", _ .HireDate = DateTime.Parse("2003/12/1"), .Birthday = DateTime.Parse("1977/9/17")}) End Sub End Class

Visual Basic

コードのコピー

Public Class Employee
    Implements INotifyPropertyChanged
    Private m_id As String
    Private m_name As String
    Private m_hiredate As DateTime
    Private m_birthday As DateTime
    Public Property ID() As String
        Get
            Return m_id
        End Get
        Set(value As String)
            If value.Length > 9 Then
                Throw New Exception("IDが10文字以上で長過ぎます。")
            End If
            m_id = value
            NotifyPropertyChanged("ID")
        End Set
    End Property
    <Display(ShortName:="氏名")> _
    Public Property Name() As String
        Get
            Return m_name
        End Get
        Set(value As String)
            m_name = value
            NotifyPropertyChanged("Name")
        End Set
    End Property
    <Display(ShortName:="入社日")> _
    Public Property HireDate() As DateTime
        Get
            Return m_hiredate
        End Get
        Set(value As DateTime)
            m_hiredate = value
            NotifyPropertyChanged("HireDate")
        End Set
    End Property
    <Display(ShortName:="誕生日")> _
    Public Property Birthday() As DateTime
        Get
            Return m_birthday
        End Get
        Set(value As DateTime)
            m_birthday = value
            NotifyPropertyChanged("Birthday")
        End Set
    End Property
    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
    Protected Sub NotifyPropertyChanged(propertyName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
    End Sub
End Class
Public Class EmployeeCollection
    Inherits ObservableCollection(Of Employee)
    Public Sub New()
        Add(New Employee() With {.ID = "U10200115", .Name = "福山 敏道", _
                                 .HireDate = DateTime.Parse("2003/12/1"), .Birthday = DateTime.Parse("1977/9/17")})
    End Sub
End Class