Solr - How to trigger the DIH from SolrNet API with C# code - solr

Question

Solr version :: 6.6.1
SolrNet API with the C# based application
I wish to invoke or trigger the data import handler from the C# code with
the help of SolrNet. But i am unable to locate any tutorial in the SolrNet
API. I can easily invoke the DIH from the solr admin UI, but my need is to invoke it from an external application.
Please suggest the code snippet how do i invoke the data import action from the C# based
application ?

Answer 1

I don't think it's possible to do completely from Solr.NET, a brief look gives me an idea, that currently there is only class responsible for DIH status page, which is good, but not covering the initial process. I think this was discarded recently, since this functionality wasn't needed.
In the SolrBasicServer class you have:
public SolrDIHStatus GetDIHStatus(KeyValuePair<string, string> options) {
var response = connection.Get("/dataimport", null);
var dihstatus = XDocument.Parse(response);
return dihStatusParser.Parse(dihstatus);
}
which is getting the DIH. Most likely, you need to extend this class and do something similar (I'm not C# developer, so not 100% sure about the code):
connection.Post("/dataimport?command=full-import", null);
or something similar with delta-import command and then later get the status part.
If updating Solr.NET is not the case for you, you still could just trigger it via usual HTTP call with some preferable C# library and do POST request to http://host:port/solr/collection-name/dataimport?command=full-import

Answer 2

string solrTargetDIHUrl = "http://localhost:8983/solr/dih/dataimport?command=delta-import";
try
{
using (var solrClient = new HttpClient())
{
var resultObj = solrClient.GetAsync(new Uri(solrTargetDIHUrl)).Result;
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("\t\t Data Import Triggered Successfully !");
Console.ResetColor();
}
}
catch(Exception ex)
{
Console.WriteLine("ERROR in DIH Trigger >>>>> " + ex.Message + "||" + ex.StackTrace);
}