c# - DataGridVIew populated with anonymous type, how to filter? -

i've populated datagridview linq query returns anonymous type.

question: chance filter datagridview data source anonymous?

// setting datagridview data source rawdocumentsdatagridview.datasource = rawtopics     .selectmany(t => t.documents)         .select(d => new             {                documentid = d.id,                rilevante = d.isrelevant,                topicid = d.topic.id // foreign key             }).tolist();  // make not visibile, waiting master change rawdocumentsdatagridview.visible = false;  // when master selection changed... void rawtopicsdatagridview_selectionchanged(object sender, system.eventargs e) {     if (rawtopicsdatagridview.currentrow == null) return;      // selected topic id     int tid = (int) rawtopicsdatagridview.currentrow.cells["topicid"].value;      // filter rawdocumentsdatagridview based on topic id     // warning: pseudo code     var olddatasource = (list<anonymoustype>)rawdocumentsdatagridview.datasource;     rawdocumentsdatagridview.datasource = olddatasource        .where(d => d.topicid == tid); } 

if keep doing (paraphrasing) "datasource = datasource.where(...)" going filtering inside filtered data repeatedly; in case would:

a: store list in field re-use, and

b: not anonymous type

class documentrow {     public int documentid {get;set;}     public bool rilevante {get;set;}     public int topicid {get;set;} } ... list<documentrow> alldata; ... alldata = rawtopics.selectmany(t => t.documents)     .select(d => new documentrow         {            documentid = d.id,            rilevante = d.isrelevant,            topicid = d.topic.id // foreign key         }).tolist(); ... rawdocumentsdatagridview.datasource = alldata    .where(d => d.topicid == tid).tolist();