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MVVM - How to update ViewModel properties once a user changes values in corresponding bound TextEditors

created 4 years ago (modified 4 years ago)

[DevExpress Support Team: CLONED FROM T943854: Masks do not work starting with v.20.2]

The reason for the bindings is to give the ViewModel a chance to react to changes to data. For example, in an editor's EditValue:

C#
// ViewModel

public virtual string FirstName { get; set; }

public void OnFirstNameChanged()
{
    this.RaiseCanExecuteChanged(x => x.Accept());
}

Is there an alternative method that does not require the use of individual bindings in the View?

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Answers approved by DevExpress Support

created 4 years ago

Hello,

Do I understand it correctly that you wish to update your ViewModel properties immediately after a user changes values in the corresponding TextEditors? If so, I recommend you add the DataSourceUpdateMode parameter to your DataBinding and set it to OnPropertyChanged in the following way:

C#
this.txtFirstName.DataBindings.Add(new System.Windows.Forms.Binding("EditValue", this.personSource, "FirstName", true, DataSourceUpdateMode.OnPropertyChanged));
this.txtLastName.DataBindings.Add(new System.Windows.Forms.Binding("EditValue", this.personSource, "LastName", true, DataSourceUpdateMode.OnPropertyChanged));

Does this solution resolve the issue? If not, it would be of great help if you send us a sample illustrating the issue. We will research it and do our best to find a suitable solution quickly.

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