中的验证方法,
public interface IValidationRule
{
,,,string ValidationMessage {组,得到,,,}
,,,bool 检查(T 价值);
}
public class IsNotNullOrEmptyRule,:, IValidationRule
{
,,,public string ValidationMessage {组,得到,,,}
,,,public bool 检查(T 价值)
,,,{
,,,,,,,if (value ==, null)
,,,,,,,{
,,,,,,,,,,,return 假;
,,,,,,,}
,,,,,,,var str =, value as 字符串;
,,,,,,,return ! string.IsNullOrWhiteSpace (str);
,,,}
}
public ValidatableObject用户名
{
,才能得到
,,,{
,,,,,,,return _userName;
,,,}
,,,
,,,{
,,,,,,,=,_userName 价值;
,,,,,,,RaisePropertyChanged((),=祝辞,用户名);
,,,}
}
private void AddValidations ()
{
,,,_userName.Validations.Add (new IsNotNullOrEmptyRule< string>,
,,,{,
,,,,,,,ValidationMessage =,“A username is 必需的。”,
,,,});
}
private bool ValidateUserName ()
{
,,,return _userName.Validate ();
}
public bool 验证()
{
,,,Errors.Clear ();
,,,IEnumerable, errors =_validations
,,,,,,,其中(v =祝辞,! v.Check(值))
,,,,,,,.Select (v =祝辞,v.ValidationMessage);
,,,Errors =, errors.ToList ();
,,,IsValid =, ! Errors.Any ();
,,,return this.IsValid;
}
请查看属性变化是的触发验证。
,,,…
& lt;/Entry>
,,,,,,,& lt; DataTrigger
,,,,,,,,,,,TargetType=叭肟凇?
,,,,,,,,,,,绑定=" {Binding UserName.IsValid} "
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