Data Tutorial

#2 Basic Example from App.Data

The samples can differ based on your Razor base class or if you're running an old version.
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Requirements

2sxc 06.05

Resources

App Data

LINQ Basics

Basic Example from App.Data

The easiest data to access comes from the current environment - like from the App or from DNN itself. The following example gets Persons data from the App.Data.GetStream("Persons") and just loops through them. This is similar to the example in the content tutorial, except that the data comes from the App.Data instead of the current instance Data.

⬇️ Result | Source ➡️

Douglas Adams
Terry Pratchett
Neil Gaiman
George Akerlof
Raphael Müller (not an author)
Ed Hardy

@inherits Custom.Hybrid.RazorTyped
@using ToSic.Razor.Blade
@using System.Linq
<ul>
  @foreach (var person in AsItems(App.Data["Persons"])) {
    <li>
      @if (Text.Has(person.Url("Mugshot"))) {
        <img loading="lazy" src='@Link.Image(person.Url("Mugshot"), width: 50, height: 50, resizeMode: "crop")' width="50px" style="border-radius: 50%">
      }
      @person.Get("FirstName")  @person.Get("LastName")
    </li>
  }
</ul>

Queries are pre-build for things like "get all authors and the books of the author in the URL" or similar (more). These are configured in the App administration. The query AuthorsWithBooks (shown to the right) is used in this example. Below you'll see us first iterate through all the items in the Authors Stream. If an author was clicked on (which places the author-id in the url), the query will also return the current Author in the Current stream as well as the CurrentBooks of that author.

⬇️ Result | Source ➡️

Current Author: Ed Hardy

Books

@inherits Custom.Hybrid.RazorTyped
@using ToSic.Razor.Blade
@using System.Linq

@{
  // get the query
  var query = Kit.Data.GetQuery("AuthorsWithBooks");

  // get all authors from the stream "Authors" in the query
  var allAuthors = AsItems(query["Authors"]);

  // get the current author (if available) from the stream Current
  var current = AsItem(query["Current"]);

  // get the books of the current author (if available) from stream CurrentBook
  var books = AsItems(query["CurrentBooks"]);

  // Get the current url params so we can derive from it for details links
  var urlParams = MyPage.Parameters;
}
<ul>
  @foreach (var person in allAuthors) {
    <!-- this li will have class=selected if it's the current one -->
    <li class='@(person.Equals(current) ? "selected" : "")'>
      <!-- this creates a link to the current page and author=id -->
      <a href='@Link.To(parameters: urlParams.Set("authorId", person.Id))'>
        @person.Get("FirstName") @person.Get("LastName")
      </a>
    </li>
  }
</ul>
@if (current != null) {
  if (current.IsNotEmpty("Mugshot")) {
    <img loading="lazy" src="@current.Url("Mugshot")?w=100&h=100&mode=crop" width="100px" class="person float-right float-end">
  }
  <h3>Current Author: @current.Get("FirstName") @current.Get("LastName")</h3>
  <strong>Books</strong>
  <ol>
    @foreach (var book in books) {
      <li>@book.Get("Title")</li>
    }
  </ol>
} else {
  <h3>No author selected - click on an author above</h3>
}