使用Mpdreamz / NEST遍历Elasticsearch查询结果

Question

Iam using Mpdreamz/NEST as .net client for searching elasticsearch.

I am getting the result count of search result using result.Hits.Total . But I am wondering how I can display the value of a field from the result.

Answer 1

Looking at NEST source code, it seems that you could do something like:

foreach (var item in result.Documents.ToList())
{
    string msg = "Name: " + item.Name + " | Value: " + item.Text;
    alert(msg);
}

Answer 2

var result = client.Search(....)

Will return aa QueryResult<dynamic> with a Documents property of type IEnumerable<dynamic> You can loop over this like so:

foreach(var d in result.Documents)
{
    Console.WriteLine(d.title);
}

The casing matters here d.Title will result in a RuntimeBinderException. Unless your elasticsearch field actually exactly matches 'Title`

You can also map to POCO's

public class MyResult
{
    public string Title { get; set; }
}

...

var result = client.Search<MyResult>(....)

Now Documents is a IEnumerable<MyResult> which will give you compile time guarantees the property exists.

You should not have to access .Fields["field"] unless you are dealing with user input.

result.Total is also preferred over result.Hits.Total