C#•2y ago

How do I pass data from my partial view to my main layout in ASP Core?

I have this code in my partial view:

// Partial View Lesson.html
@{
    ViewData["LessonTitle"] = "Lesson 1";
}

// Partial View Lesson.html
@{
    ViewData["LessonTitle"] = "Lesson 1";
}

Now I want to pass this data to my main layout.

// Main _Layout.cshtml
<html>
  <body>
    <partial name="Lesson"/>
    <h1>@ViewData["LessonTitle"]</h1>
  </body>
</html>

// Main _Layout.cshtml
<html>
  <body>
    <partial name="Lesson"/>
    <h1>@ViewData["LessonTitle"]</h1>
  </body>
</html>

What I want to do here is to set ViewData["LessonTitle"] in my partial layout and get that data in my _Layout.cshtml but I get the error NullReferenceException: Object reference not set to an instance. specifically on the <h1>@ViewData["LessonTitle"]</h1> line, if I remove that line I don't get any error at all so I believe I can't pass data from partial view to layout via ViewData....? If I can't, how do I pass data from my partial to my main layout?

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How do I pass data from my partial view to my main layout in ASP Core?