如何在C＃中将Local与反射一起使用？

Question

Maybe this is a very simple thing, but I couldn't find the answer. Can I write the following piece of code using reflection?

AdminEntities context= new AdminEntities(); 
datagridview1.DataSource = context.TABLENAME.Local.ToBindingList();

I have tried the following:

BindingSource rtBindingSource = new BindingSource();
var TableName = cboSelectTable.Text.ToString();
AdminEntities context = new AdminEntities();
var rawData = context.GetType().GetProperty(TableName).GetValue(context, null);
var truncatedData = ((IQueryable<object>)rawData).Local.ToBindingList();
var binding = new BindingList<object>(truncatedData);
rtBindingSource.DataSource = new BindingSource { DataSource = binding };
datagridview1.DataSource = rtBindingSource;

but it gives error:'System.Linq.IQueryable' does not contain a definition for 'Local' and no extension method 'Local' accepting a first argument of type 'System.Linq.IQueryable' could be found

Answer 1

I've never done much with entity-framework but the obvious issue looks like you're attempting to cast to the wrong object here:

var truncatedData = ((IQueryable<object>)rawData).Local.ToBindingList();

I believe rawData is a DbSet which does not implement the IQueryable<T> interface. Note that it does implement IQueryable but that isn't the generic version, nor would you be able to get the Local property from DbSet from it anyway. Changing the above line to the following may help:

var truncatedData = ((DbSet)rawData).Local.ToBindingList();