linq通过列名称列表选择一个新的

Question

I have a dataTable that I get from DB,
And I want to retrieve the data by linq

my dataTable From DB

+-----------------+-----------------+-----------------+
|    column_1     |    column_2     |    column_3     |
+-----------------+-----------------+-----------------+
| data_column_1_1 | data_column_2_1 | data_column_3_1 |
| data_column_1_2 | data_column_2_2 | data_column_3_2 |
| data_column_1_3 | data_column_2_3 | data_column_3_3 |
| data_column_1_4 | data_column_2_4 | data_column_3_4 |
+-----------------+-----------------+-----------------+

I do not know the number of columns in the table
but did I get another table with the names of all columns

the column's names

+----------------+
| column's names |
+----------------+
| column_1       |
| column_2       |
| column_3       |
+----------------+

How do I do this? I want it to look like this

  var list = DataTableFromDB.AsEnumerable (). Select (x => new 
{
  row1 = x.Field <string> ("row1"), 
  row2 = x.Field <string> ("row2"), 
}); 

But dynamically, can help me?

Answer 1

Use ExpandoObject and Add() method(with cast to IDictionary ) to add dynamic property to Expanded Object.

Code:

var list = DataTableFromDB.AsEnumerable().Select(x => 
            {
                var sampleObject = new ExpandoObject();
                foreach (var col in columnsNames)
                {
                    ((IDictionary<String, Object>)sampleObject)
                     .Add(col, x.Field<string>(col));
                }
                return sampleObject;
            });