Tips for displaying a populated ViewBag string from a try/catch block on the screen

I'm currently working on parsing a JSON file in my controller and implementing try/catch functionality for any errors that may arise. When an error occurs during the JSON parsing process, I populate ViewBag with the error message and attempt to display it in the view. However, despite confirming that the error message exists within ViewBag, it does not appear on the screen.

Here is the relevant code snippet from the Controller:

catch (JsonReaderException jex)
{
            ViewBag.Error = "JSON Parsing Error: " + jex.Message;
            return View();
 }

Below is how I've implemented the error message in my view:

@if ((string)ViewBag.Error != "")
{
   @Html.Label((string)ViewBag.Error)<br>
}

Answer №1

The issue lies in the presence of the period (.) character within your exception message. Upon examining the JSON exception message, you will likely notice a dot (.) included.

When utilizing the HTML label element, it may become confused if there is a period . in the initial parameter, as it anticipates a property expression in that location.

It is recommended to use

Label(string expression, string labelText)
instead.
For example: @Html.Label("",ViewBag.Error)

As mentioned by @sLaks, utilizing HTML.Raw may not be suitable for this scenario.

Answer №2

To display the value, simply print it out:

@ViewBag.Error

Avoid using Html.Raw() as your value is not in HTML format.

Answer №3

When using ViewData and TempData, you must typecast and perform null checks, unlike with ViewBag which does not require such steps.

If you would like more information, please visit:

To display an error message in your view, simply use the following code:

   @ViewBag.Error

You can place this wherever you need to show the error message.

We hope you found this information useful.

Thank you

Karthik

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