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How it works

You can use the Filter method to filter boolean and nullable boolean fields in a couple of ways, as shown in the following list of use cases and examples.

Existence

To search for documents where a boolean field has a value, use the Exists method. The following search finds blog posts that has an Approved property with a value. In other words, the below code is similar to the LINQ query Where(x => x.Approved.HasValue).

C#
var searchQuery = client.Search<BlogPost>()
    .Filter(x => x.Approved.Exists());

You can negate the filter with an exclamation mark (!); to instead find all blog posts that doesnt have an Approved property, use the following code.

C#
var searchQuery = client.Search<BlogPost>()
    .Filter(x => !x.Approved.Exists());

Matching true or false

For exact matching we can use the Match method. The following search matches blog posts whose Approved property is true. The LINQ equivalent would be Where(x => x.Approved).

C#
var searchQuery = client.Search<BlogPost>()
    .Filter(x => x.Approved.Match(true));
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Last updated: Nov 16, 2015

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