public System.Func<object,IEnumerable> ColumnsSelector {get; set;}

Property Value

• Returns System.Collections.Generic.IEnumerable`1 of System.Data.DataColumn to select columns for the specified System.Data.DataTable.
• Returns System.Collections.Generic.IEnumerable`1 of System.Int32 to select columns by indexes for the specified System.Data.DataTable.
• Returns System.Collections.Generic.IEnumerable`1 of System.String to select columns by names for the specified System.Data.DataTable, dictionary or custom object. This option is not AOT-compatible for custom objects.
• Returns System.Collections.Generic.IEnumerable`1 of property getter System.Delegate (where the delegate type of each element is System.Func`2, T is the element type of collection, TResult is the property type) to select columns with custom column getters.
  In this case, IncludeColumnsHeader must be false. Otherwise, an exception will be thrown. Because we don't know the column names.
• Returns System.Collections.Generic.IEnumerable`1 of named property getter System.ValueTuple`2 (where T1 is column name System.String, T2 is property getter System.Delegate; The delegate type of each element is System.Func`2, T is the element type of collection, TResult is the property type) to select columns with custom column names and custom column getters.
  In this case, IncludeColumnsHeader should be true. Otherwise, the column names will be ignored.

Reference

DataImportOptions Class
DataImportOptions Members