在RDFDOTNET中查询RDF文件

我正在使用rdfdotnet库查询rdf文件

这是我的密码

//Define your Graph here - it may be better to use a QueryableGraph if you plan
//on making lots of Queries against this Graph as that is marginally more performant
IGraph g = new Graph();

//Load some data into your Graph using the LoadFromFile() extension method
g.LoadFromFile("C:/Users/admin/Desktop/current/Semantic/test.rdf");

//Use the extension method ExecuteQuery() to make the query against the Graph
try
{
    String q = " Prefix u:<http://localhost:49682/Semantic/test.rdf> SELECT * WHERE {?x1 u:age ?x2}";
        Object results = g.ExecuteQuery(q);

        if (results is SparqlResultSet)
        {
            //SELECT/ASK queries give a SparqlResultSet
            SparqlResultSet rset = (SparqlResultSet)results;
            foreach (SparqlResult r in rset)
            {
                //Do whatever you want with each Result
            }
        }
        else if (results is IGraph)
        {
            //CONSTRUCT/DESCRIBE queries give a IGraph
            IGraph resGraph = (IGraph)results;
            foreach (Triple t in resGraph.Triples)
            {
                //Do whatever you want with each Triple
            }
        }
        else
        {
            //If you don't get a SparqlResutlSet or IGraph something went wrong 
            //but didn't throw an exception so you should handle it here
            Console.WriteLine("ERROR");
        }
    }
    catch (VDS.RDF.Query.RdfQueryException queryEx)
    {
        //There was an error executing the query so handle it here
        Console.WriteLine(queryEx.Message);
    }

它在我执行查询时给出一个错误

---

[UriToken位于第1行第10列至第1行第52列]在查询中，应在前缀动词后加前缀标记

您使用的是哪个版本的库

旧版本有一个bug，在你的例子中前缀u:-和命名空间URI之间必须有一个空格

如果使用库0.5.1的最新版本，则不再存在此问题

编辑

这是在版本0.5.0中修复的，请参阅问题，因此，如果您看到此错误，您在撰写本文时至少落后两个版本，因为我已经回答了升级应该解决此问题