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Parameters on Url.Action() have null properties


By : Tim Lundqvist
Date : October 17 2020, 08:10 AM
help you fix your problem It doesn't know how to serialize the model into a query string :)
You need to break your model into multiple properties with simple values, or use a form POST to submit them as a model.
code :


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Asp.Net MVC 3 Action Result parameters and data validation: are all primitive properties to be string?


By : Kapil Nanda
Date : March 29 2020, 07:55 AM
I wish this helpful for you You should define your view models to have properties (or fields) with the correct data type. There is no requirement for them to be strings. If you have defined a property to be of type int and the model binder binds the request data to it, but cannot coerce the value to an int then the property will not be set and the model state will indicate that there is an error.
Some people have the concern of wanting to rerender the page and still have the user value in the textbox to allow them to correct it. If you use the built in Html helper methods, then this will be done for you as it looks to see if there is a model state error for that field and if there is, it will try and find the value from the request data and use that instead.

ASP.Net mvc Url.Action parameters are always null


By : mbmb
Date : March 29 2020, 07:55 AM
wish helps you It appears that you are misunderstanding the workflow here. The link in you code is calculated by the server before is sends the page to the client. There is no way for it to use the values that the user enters into the text boxes later. To do that, you need a form with a submit action, or an AJAX call that extracts the values of the HTML elements and sends those back to the server.

Make action properties set from empty string parameters null


By : olchik.k
Date : March 29 2020, 07:55 AM
I hope this helps . I don't think too many people would really desire this behavior since it basically subverts normal HTTP parameter behavior, where unfilled parameters are an empty string.
You have a few options.

Redirect to action with parameters always null in mvc


By : Mandar
Date : March 29 2020, 07:55 AM
hop of those help? You cannot pass complex objects in an url like that. You will have to send its constituent parts:
code :
public ActionResult Action1()
{
     if (ModelState.IsValid)
     {
           // Here user object with updated data
           return RedirectToAction("action2", new { 
               id = user.Id, 
               firstName = user.FirstName, 
               lastName = user.LastName, 
               ...
           });
     }
     return view(Model);
}
public ActionResult Action1()
{
     if (ModelState.IsValid)
     {
           // Here user object with updated data
           return RedirectToAction("action2", new { 
               id = user.Id, 
           });
     }
     return view(Model);
}
public ActionResult Action2(int id)
{
    User user = GetUserFromSomeWhere(id);
    return view(user);
}
public ActionResult Action1()
{
     if(ModelState.IsValid)
     {
           TempData["user"] = user;
           // Here user object with updated data
           return RedirectToAction("action2");
     }
     return view(Model);
}
public ActionResult Action2()
{
    User user = (User)TempData["user"];
    return View(user);
}

Mapstruct Mapping : Return null object if all source parameters properties are null


By : Diego Gómez
Date : March 29 2020, 07:55 AM
it should still fix some issue This currently is not supported from MapStruct directly. However, you can achieve what you want the help of Decorators and you will have to manually check if all the fields are empty and return null instead of the object.
code :
@Mapper
@DecoratedWith(TagMapperDecorator.class)
public interface TagMapper {
    @Mappings({
        @Mapping(target = "id", source = "tagId"),
        @Mapping(target = "label", source = "tagLabel")
    })
    Tag mapToBean(TagRecord tagRecord);
}


public abstract class TagMapperDecorator implements TagMapper {

    private final TagMapper delegate;

    public TagMapperDecorator(TagMapper delegate) {
        this.delegate = delegate;
    }

    @Override
    public Tag mapToBean(TagRecord tagRecord) {
        Tag tag = delegate.mapToBean( tagRecord);

        if (tag != null && tag.getId() == null && tag.getLabel() == null) {
            return null;
        } else {
            return tag;
        }
    }
}
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