Solr highlights error

Question

I am using solr 4.6 with Jetty and as a client latest solrnet build (1672). I haven't done any changes to solrconfig.xml or schema.xml, because all I need is content and id of the document. My class is:

public class Register
{
    [SolrUniqueKey("id")]
    public string Id { get; set; }

    [SolrField("content")]
    public string Content { get; set; }

    [SolrField("text")]
    public string Text{get;set;}
}

I insert documents into solr with code:

using (FileStream fileStream = File.OpenRead(filePath))
            {
                var response =
                    Solr.Extract(
                        new ExtractParameters(fileStream, txtId.Text)
                        {                            
                            ExtractFormat = ExtractFormat.Text,
                            ExtractOnly = false,

                        });            

                            }

            Solr.Commit();

My problem is that I can't make highlights to work. My code for highlightning:

QueryOptions options = 
new QueryOptions{Highlight = new HighlightingParameters{Fields = new[] {"id", "content", "text"}}};
                SolrQueryByField query = new SolrQueryByField("text", "nhibernate");
                var res = Solr.Query(query, options);

When the third line is executed I am receiving an error:

{"Could not convert value 'System.Collections.ArrayList' to property 'Content' of document type SolrTest.Register"}

What could be wrong here? I have followed this link

Answer 1

Your issue is that in the default schema.xml file, the field content is defined with multiValued=true. Telling Solr to allow multiple values for this field within a single document, e.g. stored as an array. So you need to change the Content property in your Register class to the following:

 [SolrField("content")]
 public ICollection<string> Content { get; set; } 

As shown in the SolrNet Mapping documentation.