/// <summary>
/// Returns a list of rows filtered by a filter function
/// </summary>
/// <param name="filterFunc"></param>
/// <returns></returns>
public FlexTable <T> FilteredRows(Func <T, bool> filterFunc)
{
var result = new FlexTable <T>(this.columnDescriptors);
result.AddRange(this.Where(row => filterFunc(row)));
return(result);
}
/// <summary>
/// Attaches a row set to the current row set (only new columns, does not overwrite or append)
/// </summary>
/// <remarks>
/// This will append those columns from the other row set, which are
/// new to the current row set. Additionally it will NOT overwrite
/// the values of any already existent columns of the current row set.
/// It will also not add any rows of the other row set, which have no
/// correspondent rows in the current row set.
/// Only the first occurence of the matching value in the other row set
/// will be merged (this is non-deterministic!)
/// </remarks>
/// <param name="other">the other row set</param>
/// <param name="myMatchColumn">column name to match on my side</param>
/// <param name="otherMatchColumn">column name to match on the other side</param>
public void Attach(FlexTable <T> other, string myMatchColumn, string otherMatchColumn)
{
// get the list of columns, which are "new" to the current row set.
var colList =
other.ColumnDefinitions.Where(
col => !this.ColumnDefinitions.Any(myCol => myCol.ColumnPropertyName.Equals(col.ColumnPropertyName)))
.ToList();
if (colList.Count == 0)
{
return; // nothing to do, so we do not need to scan
}
// add the columns of the other list
foreach (var column in colList)
{
this.AddColumn(column.ColumnTitle, column.ColumnType, column.ColumnPropertyName,
column.SourcePropertyName);
}
// now loop over the rows of the current row set
// try to match a corresponding row in the other row set
foreach (var row in this)
{
// get my matching key
var myKey = row[myMatchColumn];
// skip this one if the key is null or empty
if (myKey == null || (myKey is string && string.IsNullOrEmpty((string)myKey)))
{
continue;
}
// find the first occurence of the key on the other side
var otherRow = other.FirstOrDefault(r => r[otherMatchColumn].Equals(myKey));
// copy the data
if (otherRow != null)
{
foreach (var column in colList)
{
row[column.ColumnPropertyName] = otherRow[column.ColumnPropertyName];
}
}
}
}
