Question

I can’t use the example here because it’s specific to the structure the asker was using.

Currently, I’m going:

PropertyInfo[] props = this.GetType().GetProperties();
foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns)
    if( !props.Any(p => p.Name == dataColumn.ColumnName) )
        ...

I’d much rather have something in one line, such as:

foreach (DataColumn dataColumn in dataAsDataRow.Table.Columns.Cast<DataColumn>.Except(props) )
    ...

Any ideas?

Answer 1

var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !props.Any(p => p.Name == column.ColumnName);
foreach(DataColumn in columns) 
    ....

Or the slightly optimized version (as always, depending on the runtime number of columns, properties, etc, etc):

PropertyInfo[] props = this.GetType().GetProperties();
var lookup = new HashSet<string>(props.Select(x=>x.Name));
var columns = dataAsDataRow.Table.Columns.Cast<DataColumn>().Where(column => !lookup.Contains(column.Name));