Concatenate data but ignore duplicate lines
I have the following code, its a custom picker for sharepoint 2010.
It searches by username, but also by person's name. Since it contains a search, if I try with part of my username:cia
It shows my duplicate lines as it matches the username as well as the person's name.
this is my code (i cannot use LINQ:
protected override int IssueQuery(string search, string groupName, int pageIndex, int pageSize)
{
try
{
// Find any user that has a matching name
var table = ADHelper.ExecuteNameQuery(RootPath, search);
// 20249: Search by username, method was already done, but it was not being called.
var table2 = ADHelper.ExecutesAMAccountNameQuery(search);
table2.Merge(table,);
PickerDialog.Results = table2;
+3
source to share
2 answers
Typically, the method DataTable.Merge
removes duplicates implicitly. But only when the values of all columns are the same.
I'm not sure if there is something simpler (you mentioned you cannot use LINQ), but you can combine both and remove duplicates:
List<string> dupColumns = new List<string>();
dupColumns.Add("ColumnA");
dupColumns.Add("ColumnB");
table2.Merge(table,);
RemoveDuplicates(table2, dupColumns);
And here's the remove-duplicates function:
private void RemoveDuplicates(DataTable table, List<string> keyColumns)
{
Dictionary<string, string> uniquenessDict = new Dictionary<string, string>(table.Rows.Count);
System.Text.StringBuilder sb = null;
int rowIndex = 0;
DataRow row;
DataRowCollection rows = table.Rows;
while (rowIndex < rows.Count)
{
row = rows[rowIndex];
sb = new System.Text.StringBuilder();
foreach (string colname in keyColumns)
{
sb.Append(((string)row[colname]));
}
if (uniquenessDict.ContainsKey(sb.ToString()))
{
rows.Remove(row);
}
else
{
uniquenessDict.Add(sb.ToString(), string.Empty);
rowIndex++;
}
}
}
+7
source to share
you should the .ToTable function
here is a sample code
DataTable DT1 = new DataTable();
DT1.Columns.Add("c_" + DT1.Columns.Count);
DT1.Columns.Add("c_" + DT1.Columns.Count);
DT1.Columns.Add("c_" + DT1.Columns.Count);
DataRow DR = DT1.NewRow();
DR[0] = 0;
DR[1] = 1;
DR[2] = 2;
DT1.Rows.Add(DR);
DataTable DT2 = new DataTable();
DT2.Columns.Add("c_" + DT2.Columns.Count);
DT2.Columns.Add("c_" + DT2.Columns.Count);
DT2.Columns.Add("c_" + DT2.Columns.Count);
DT2.Columns.Add("c_" + DT2.Columns.Count);
DR = DT2.NewRow();
DR[0] = 0;
DR[1] = 1;
DR[2] = 2;
DR[3] = 3;
DT2.Rows.Add(DR);
DT1.Merge(DT2);
Trace.IsEnabled = true;
DataTable DT_3=DT1.DefaultView.ToTable(true,new string[]{"c_1","c_2","c_0"});
foreach (DataRow CDR in DT_3.Rows)
{
Trace.Warn("val",CDR[1]+"");//you will find only one data row
}
+1
source to share