UpdateSourceTrigger to explicit MVVM

Question

0.00/5 (No votes)

See more:

Hi all,

I have a view model to modify an entity and i want update the source when the user press save button so I’ve set the UpdateSourceTrigger to explicit but now how can i update the source in MVVM pattern?

With explicit binding, this has always been expected to update the binding source using BindingExpression.

I have tried relay command with parameters also. But it all goes by assumption.

Advise me. Thanks in advance

Posted 4-Jun-14 4:39am

Murugesan_Na

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Gul Md Ershad · Answer 1 · 2014-08-13T01:29:00

Please write this code in event "OnPreviewKeyDown" of your .XAML window:

if (e.Key == Key.Enter)
{
var focusedElement = Keyboard.FocusedElement as FrameworkElement;

if (focusedElement is TextBox)
{
var expression = focusedElement.GetBindingExpression(TextBox.TextProperty);
if (expression != null) expression.UpdateSource();
}
}

mBuchwald · Answer 2 · 2014-06-11T03:14:00

In cases like that, I usually have an editing view model, that makes a copy of all the properties that are editable, and I bind to those. The save button will copy the editable properties into the model's properties.

Say a model with properties "Name: and "Age" will have a view model with "EditableName" and "EditableAge."

If my view model was solely for the editing view, then I'd probably just use a view model that takes the model in its constructor, copies the properties into the vm's properties (ie: doesn't directly forward / write to model) and keep the names Name and Age in the view model.

Does that make sense?

UpdateSourceTrigger to explicit MVVM

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0