.NET RDF DBLP數據集查詢

當我運行下面的代碼使用此代碼段查詢DBLP數據集我使用該端點http://dblp.l3s.de/d2r/snorql enter code here字符串ST =「」; 字符串QRY = 「」; String uri_V;.NET RDF DBLP數據集查詢

uri_V = "http://dblp.l3s.de/d2r/sparql"; 



    // Modify if need...... 
    //String ns = "\""+TextBox1.Text.ToString()+"\""; 
    // String qry = "SELECT DISTINCT ?name WHERE { ?person foaf:name ?name.FILTER regex(str(?name),"+ns+").}"; 
    if (radiosrch.SelectedIndex == 0) 
    { 
     qry = "SELECT ?title WHERE {?game <http://purl.org/dc/terms/subject> <http://dbpedia.org/resource/Category:First-person_shooters> .?game foaf:name ?title .}ORDER by ?title"; 
    } 
    else// if (radiosrch.SelectedIndex == 1) 
    { 
     // qry= "query for publisher." 
     qry = "SELECT DISTINCT ?Concept WHERE {[] a ?Concept} LIMIT 10"; 
    } 


    //Common 
    SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri(uri_V)); 
    SparqlResultSet results = endpoint.QueryWithResultSet(qry); 
    foreach (SparqlResult result in results) 
    { 
     Console.WriteLine(result.ToString()); 
     st = st + result.ToString() + "\n"; 
    } 
    TextBox3.Text = st.ToString(); 
} 
catch (Exception ex) 
{ 
    Label1.Visible = true; 
    Label1.Text = ex.ToString(); 
}

我收到以下錯誤

VDS.RDF.Query.RdfQueryException：HTTP錯誤的發生，同時設法使SPARQL查詢，請參閱內部異常的詳細信息---> System.Net.WebException ：遠程服務器返回錯誤：（400）錯誤的請求。在System.Net.HttpWebRequest.GetResponse（）在VDS.RDF.Query.SparqlRemoteEndpoint.ExecuteQuery（URI目標，字符串POSTDATA，字符串接受）在VDS.RDF.Query.SparqlRemoteEndpoint.QueryInternal（字符串sparqlQuery，字符串acceptHeader）在VDS。 RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet（ISparqlResultsHandler處理程序，字符串sparqlQuery）---內部異常堆棧跟蹤的末尾在VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet（ISparqlResultsHandler處理程序，字符串sparqlQuery）在VDS.RDF.Query。 SparqlRemoteEndpoint.QueryWithResultSet（字符串sparqlQuery）在Index.ImageButton1_Click（對象發件人，ImageClickEventArgs e）在d：\ SPARQL \ Index.aspx.cs：行48

plz幫助我儘快解決，PLZ

來源

2013-04-03 Jaspartap Singh