Generic extension method : Type argument cannot be inferred from the usage

Question

I\'m trying to create a generic extension method, that works on typed data tables :

public static class Extensions
{
    public static TableType DoSomething&         


        

Answer 1

Even if that wasn't ideal, I gave up trying to return anything at all which allows me to do something like the following:

public static void DoSomething(this TypedTableBase table, param Expression>[] predicates)
    where RowType : DataRow
    {
        // do something to each row of the table where the row matches the predicates
        // do not return the table... too bad for chaining commands
    }

And then use it like so:

MyTypedDataSet.MyTypedDataTable table = new MyTypedDataSet.MyTypedDataTable();
table.DoSomething(row => row.Field1 == "foo"));

and the compiler infers the type correctly.

Thank you both for your answers.