How to redirect with viewmodel

Question

In a GET action method, based in some condition, I need to either return the view, or redirect to another action method that receives a view model via POST. This second action method view is strongly typed to a model.

The code below is not working: when the condition is true, it redirects to the second action method and this runs OK, but right after that, it returns to the last line of the first method.

// GET: MyController/Info
public async Task<IActionResult> Info(int someId, string something) 
{
    // create viewmodel
    SomeViewmodel vm = new SomeViewmodel() 
                           {
                               Id = someId,
                               Name = something
                           };

    // depending on some condition, either redirect to a post method, or return view
    if (somecondition) 
    {
        return await this.Info2(vm);
    }
    else 
    {
        return View(vm);
    }
}   //PROBLEM HERE - if condition is true, it returns here after Info2()... 

public async Task<IActionResult> Info2(SomeViewmodel vm) 
{
    // ...
    MyModel mdl = new MyModel() 
                  {
                      // ...
                  }
    return View(mdl);
}

The error I get is :

InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'Castle.Proxies.MyModelProxy', but this ViewDataDictionary instance requires a model item of type 'MyApp.MvcApp.ViewModel.SomeViewModel'.

Victor · Accepted Answer · 2025-05-10 19:20:35Z

2

If it's necessary redirect to another action method use RedirectToAction():

// depending on some condition, either redirect to a post method, or return view
if (somecondition) 
{
    return await RedirectToAction(nameof(Info2), vm);
}    
return View(vm);

Note: When your directly return this.Info2(vm); from the action method the MVC will use signature of the Info view data model. This is why you got the data binding error.

edited May 10 at 19:20

answered May 10 at 19:10

Victor

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1 Comment

patsy2k May 12 at 8:57

nice! it works (except I had to remove the "await" part... so it finally worked with return RedirectToAction(nameof(Info2), vm);

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