Examine Manager

Accessing the singleton can be done by using dependency injection.

In a class you can inject the IExamineManager interface:

using Examine;

namespace MyCustomUmbracoSolution;

public class MyClass
{
    private readonly IExamineManager _examineManager;
    public MyClass(IExamineManager examineManager)
    {
        _examineManager = examineManager;
    }
}

In a view the IExamineManager can be injected as well:

@inject IExamineManager ExamineManager;

This returns an active instance of the ExamineManager which exposes operations such as:

• Default index & search providers

• Full collection of index & search providers

• All indexing and searching methods

Searching

Important to note that the Search methods on the ExamineManager will call the Search methods of the default search provider specified in config. If you want to search using a specific provider, there are generally two approaches for this.

If you want to use the searcher of a specific index, you should get the the searcher via the index:

@inherits UmbracoViewPage
@using Examine
@using Umbraco.Cms.Core
@inject IExamineManager ExamineManager
@{

    // Get the search text from the query string
    string query = Context.Request.Query["query"];

    // Try to get the "ExternalIndex" from the Examine manager
    if (ExamineManager.TryGetIndex(Constants.UmbracoIndexes.ExternalIndexName, out IIndex index))
    {

        // Search via the searcher of the index
        ISearchResults searchResults = index.Searcher.Search(query);

        // Check whether the search revealed any results
        if (searchResults.Any())
        {
            <ul>
                @foreach (ISearchResult result in searchResults)
                {

                    // Skip the result if the ID is null
                    if (result.Id is null) continue;

                    // Skip the result if not found in the content cache
                    if (Umbraco.Content(result.Id) is not {} node) continue;

                    <li>
                        <a href="@node.Url()">@node.Name</a>
                    </li>

                }
            </ul>
        }

    }

}

If you have configured a custom searcher that you wish to use instead, you can access the searcher directly via the IExamineManager instance:

bool canGetSearcher = ExamineManager.TryGetSearcher("MyCustomSearcher", out ISearcher searcher);

An example using a custom searcher is below:

@inherits UmbracoViewPage
@using Examine
@inject IExamineManager ExamineManager
@{

    // Get the search text from the query string
    string query = Context.Request.Query["query"];

    // Try to get the "MyCustomSearcher" searcher
    if (ExamineManager.TryGetSearcher("MyCustomSearcher", out ISearcher searcher))
    {

        // Search via the searcher
        ISearchResults searchResults = searcher.Search(query);

        // Check whether the search revealed any results
        if (searchResults.Any())
        {
            <ul>
                @foreach (ISearchResult result in searchResults)
                {

                    // Skip the result if the ID is null
                    if (result.Id is null) continue;

                    // Skip the result if not found in the content cache
                    if (Umbraco.Content(result.Id) is not {} node) continue;

                    <li>
                        <a href="@node.Url()">@node.Name</a>
                    </li>

                }
            </ul>
        }

    }

}

Indexing

When you wanna populate an index, you will need to use the IExamineManager and get the specific index. The build-in index names are all available as constants from the Umbraco.Cms.Core.Constants.UmbracoIndexes namespace

if (_examineManager.TryGetIndex(Umbraco.Cms.Core.Constants.UmbracoIndexes.ExternalIndexName, out IIndex index))
{
   // Use index here
}

The indexing methods available on a single index are:

void DeleteFromIndex(IEnumerable<string> itemIds);
void DeleteFromIndex(this IIndex index, string itemId);
void IndexExists();
void IndexItems(IEnumerable<ValueSet> values);