CODEWITHSUNDEEP
c#asp.netlinq
Prasanth Kumar Vinakota
Prasanth Kumar Vinakota

Reputation: 353

Remove rows from datatable matching a List<string>

I have a DataTable and I want to remove all the rows matching a List< string>, how to do that? Following is my code,

public static DataTable GetSkills(List<Skill> EnteredSkills)
{
    DataTable dt = new DataTable();
    dt = GetDBMaster("SkillMaster");
    List<string> MatchingSkills = EnteredSkills.Select(c => c.Text).ToList();
    //Logic to Delete rows MatchingSkills from dt here
    return dt;
}

Final Solution

    public static DataTable GetSkills(List<Skill> EnteredSkills)
    {
        DataTable dt = new DataTable();
        dt = GetDBMaster("SkillMaster");
        var MatchingSkills = new HashSet<string>(EnteredSkills.Select(c => c.Text));
        List<DataRow> removeRows = dt.AsEnumerable().Where(r => MatchingSkills.Contains(r.Field<string>("DataTableSkillColumnName"))).ToList();
        removeRows.ForEach(dt.Rows.Remove);
        return dt;
    }

Upvotes: 4

Views: 4670

Answers (3)

TPG
TPG

Reputation: 3219

This solution works great! I'm using it for my solution.

List<DataRow> lsFilteredData = dtUnfilteredData.AsEnumerable().Where(q => lsWhatIWanted.Contains(q.Field<string>("Code"))).ToList();

foreach (DataRow drFilteredData in lsFilteredData)
{
    //Do whatever you want here
}

Upvotes: 0

Tim Schmelter
Tim Schmelter

Reputation: 460228

Presuming the column is SkillName

List<DataRow> removeRows = dt.AsEnumerable()
    .Where(r => MatchingSkills.Contains(r.Field<string>("SkillName")))
    .ToList();
removeRows.ForEach(dt.Rows.Remove);

Side- note: i would use a HashSet<string> because it would be more efficient:

var MatchingSkills = new HashSet<string>(EnteredSkills.Select(c => c.Text));

Upvotes: 5

Praneet Nadkar
Praneet Nadkar

Reputation: 813

The simplest way will be:

var lstRemoveColumns = new List<string>() { "ColValue1", "ColVal2", "ColValue3", "ColValue4" };
List<DataRow> rowsToDelete = new List<DataRow>();

foreach (DataRow row in dt.Rows) 
{
    if (lstRemoveColumns.Contains(row["ColumnName"].ToString())) 
    {
        rowsToDelete.Add(row);
    }
}

foreach (DataRow row in rowsToDelete) 
{
    dt.Rows.Remove(row);
}

dt.AcceptChanges();

Look here

Upvotes: 2

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