比较C#中两个DataTable的列名

Question

I have two datatables,

1. dtSchema datatable filled by ms-access database
2. table datatable filled by excel sheet

table must have four columns named (SN, FN, DOB, Sec)

I want to compare the columns name of table with columns name of dtSchema . The columns in table which are not matched with dtSchema place them in list.

foreach (DataColumn col in table.Columns)
{
       isColumnMatch = false;
       foreach(DataColumn colDb in dtSchema.Columns)
       {
             if(col.ColumnName == colDb.ColumnName)
             {
             }
       }

}

I can compare the datatables column name. If table above four columns matched with dtSchema and the table has more than four columns then columns which are not matched must be placed in list.

Answer 1

It can be achieved by a simple LINQ query, something like:

var tableColumnNames = table.Columns.Cast<DataColumn>().Select(c=>c.ColumnName).ToList();
var schemaColumnNames = dtSchema.Columns.Cast<DataColumn>().Select(c=>c.ColumnNames).ToList();

var unmatchedColumnNames = 
    from col in tableColumnNames where !schemaColumnNames.Contains(col) select col;

Answer 2

For this, you need to use any collection to save all those columns that are not matched so in case if columnName or title is not matched then you have to push it to some list. So at the end, you will have a list of unmatched columns

===== Updated ======

var filter= from firstDt in dt1.AsEnumerable()
        where !(from secondDt in dt2.AsEnumerable() select secondDt["Name"]).Contains(firstDt["Name"].ToString()) select firstDt; DataTable resultDt = filter.CopyToDataTable();