CODEWITHSUNDEEP
c#asp.net.netmodel-bindingasp.net-4.5
Justin
Justin

Reputation: 6549

ASP.NET 4.5 model binding customize updating

I am using the ASP.NET forms model binding that was added in .NET 4.5. I see that there are many things about model binding that is supposed to make it easier and reduce how much code you need to write. However, I want to know if there is a way you can update items manually.

I have found the TryUpdateModel method like so:

public void UpdateEquipment(int Id)
{
    var equip = EquipCondContext.Equipments.Single(x => x.Id == Id);
    TryUpdateModel(equip);
}

but, I would like to have the ability to do this:

public void UpdateEquipment(int Id)
{
    var equip = EquipCondContext.Equipments.Single(x => x.Id == Id);
    //equip.Description = A TextBox.Text on that row that I just saved in my list.
    EquipCondContext.SaveChanges();
}

Is there a way I can do a more manual kind of updating like that?

Here is an example scenario. Lets say I have a textbox on a row where a user enters a user ID, but on the update I want to actually set their badge number. In my update function, I first want to do a query to get the badge number for the given user ID and then set this property in my entity before saving the context.

Upvotes: 1

Views: 589

Answers (2)

magnattic
magnattic

Reputation: 12998

What you are trying to do is hooking into the model binding process and changing values before they are saved. I am not sure if the model binding in Webforms is 1:1 the same as in MVC, but you could try this article:

http://www.markeverard.com/2011/07/18/creating-a-custom-modelbinder-allowing-validation-of-injected-composite-models/

The article is about validation, but you could just as easily change the values there.

Basically what you do is to register a custom ModelBinder for your class which then hooks into the call to bind the model.

Upvotes: 1

magnattic
magnattic

Reputation: 12998

If you want to track changes in the Textbox manually you have to listen to the Textbox.TextChanged event.

<asp:Textbox ... OnTextChanged="MyTextBoxOnTextChanged" />

There you can do with the textbox value whatever you want, in your case store it as the according equipment description.

Upvotes: 0

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