使用LINQ在BindingSource上进行查询

Question

I want to use Linq for queries on Binding Source.

var myItems = ((IList<myObjectBinding>)myTableBindingSource.List).Where(some linq query);

This code gives the following error during runtime: Unable to cast object of type 'System.Data.DataView' to type 'System.Collections.Generic.IList

So, Is it possible to use Linq for queries on binding source? I want to use binding source objects elsewhere in the code.

Answer 1

first you have to get all records from bindingSource.DataSource in a list like

var list = myBindingSource.List.OfType<yourmodel/class>();

than you can use query on this list like

var records = list.where(u => u.id == yourid).ToList();

Answer 2

您可以只编写一个转换器，然后在转换器中添加LINQ逻辑。

Answer 3

You need to cast to the generic version of IList using the Cast extension:

((IList)myTableBindingSource.List).Cast<myObjectBinding>().Where(some linq query);

DataView inherits from System.Collections.IList , but you are trying to cast to System.Collections.Generic.IList .