Executing a Query

Searching an index is done by using the RediSearchQuery builder to create a RediSearch query and then executing the query using the Search or SearchAsync extension method.

var queryDefinition = RediSearchQuery
        .On("zipcodes")
        .UsingQuery("@State:FL")
        .Build();

var result = await _db.SearchAsync(queryDefinition);

Handling the Result

The result from the above query against the sample zipcodes index will yield an instance of the SearchResult class. The SearchResult class is an implementation of IEnumerable<SearchResultItem>. Each instance of SearchResultItem represents a "row" in the result set, and gives you access to the Redis key as well as a dictionary of the stored fields for the search result.

The following example demonstrates handling the result from the "Executing a Query" sample above and projecting it into an anonymous type:

var result = await _db.SearchAsync(queryDefinition);

var floridaZipcodes = result.Select(x =>
{
    // This index defines "Coordinates" as "Geo" however when they are
    // returned they come back as a string. So we have to do a little
    // bit of post processing here. 
    var coordinates = ((string)x["Coordinates"]).Split(",");

    return new
    {
        x.DocumentKey,
        ZipCode = (string)x["ZipCode"],
        City = (string)x["City"],
        State = (string)x["State"],
        Latitude = double.Parse(coordinates[1]),
        Longitude = double.Parse(coordinates[0]),
        TimeZoneOffset = (int)x["TimeZoneOffset"],
        DaylightSavingsFlag = (bool)x["DaylightSavingsFlag"]
    };
});

Mapping the Result

See this documentation for defining a type mapping.

With the appropriate mapping defined you can now map the result like...

var result = await _db.SearchAsync(queryDefinition);

var mappedResult = result.As<ZipCode>();

The variable mappedResult will be of type IEnumerable<ZipCode>.