C# - Filtering with DataView

I have a dataset full of order information and I am trying to filter the datase开发者_Python百科t with DataView.

This is what I have so far. This returns all the columns in the DataSet.

DataTable orders = dataSet.Tables[0];

EnumerableRowCollection<DataRow> query = from order in orders.AsEnumerable()
                                     where order.Field<Int16>("OrderID") = 2 
                                     select order;

DataView view = query.AsDataView();

What I want to do is that the query only return some columns not all of them. What do I do?

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Use anonymous types in your query:

DataTable orders = dataSet.Tables[0];

EnumerableRowCollection<DataRow> query = from order in orders.AsEnumerable()
                                     where order.Field<Int16>("OrderID") = 2 
                                     select new { Property1, Property2 };

DataView view = query.AsDataView();

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Maybe you should consider actually using the capabilities of the DataView itself instead of using a sort-of roundabout LINQ solution:

var filter = new DataView(orders);
filter.RowFilter = "OrderID = 2";
var resultTable = filter.ToTable(false, "Column1", "Column2", "Column3");

The ToTable() method allows you to specify an arbitrary list of columns to create a new table from. Of course you can still wrap the result table in another DataView if you need to return that instead of a table:

var resultView = new DataView(resultTable);