How to make an array from different datasources?

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Hi, I would like to make an array of values from two different datatables.
I try to extract customer names from two datatables. These datatables contain several transactions from different customers.

What I have tried:

I get the names in arrays like this:

C#

string[] customers_DebAufwErtr = dtCloned_DebAufwErtr.AsEnumerable()            
            .Select(r => r.Field<string>("Kreditor Name"))
            .Distinct()
            .ToArray(); // The same thing for the other table as well

I would now like to join the two arrays but also avoiding to have the same name twice in the resulting array.
Any suggestions how to do that?

Posted 9-Jan-17 5:59am

Member 12912306

Updated 9-Jan-17 6:18am

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Wendelius · Answer 1 · 2017-01-09T06:17:00

One way is to use concat method. Consider the following example

C#

DataTable first = new DataTable();
DataTable second = new DataTable();

first.Columns.Add("col1", typeof(string));
second.Columns.Add("col1", typeof(string));

first.Rows.Add("A");
first.Rows.Add("B");
first.Rows.Add("C");
first.Rows.Add("D");

second.Rows.Add("C");
second.Rows.Add("D");
second.Rows.Add("E");
second.Rows.Add("F");

var distinctValues = (from i1 in first.AsEnumerable()
                      select i1.Field<string>("col1")).Concat(
                         from i2 in second.AsEnumerable()
                         select i2.Field<string>("col1")).Distinct();
foreach (string item in distinctValues) {
   Console.WriteLine(item);
}

#realJSOP · Answer 2 · 2017-01-09T06:18:00

You could add the names from the two data tables to a HashTable collection. A hash table does not allow duplicates (throws an exception when you try to add a duplicate entry, that you must handle, but can just ignore). In the code below, I'm using the same colletion for both linq statements because I don't know the name of the 2nd data table.

C#

string[] customers_DebAufwErtr = dtCloned_DebAufwErtr.AsEnumerable()
            .Select(r => r.Field<string>("Kreditor Name"))
            .Distinct()
            .ToArray();

string[] customers2_DebAufwErtr = dtCloned_DebAufwErtr.AsEnumerable()
            .Select(r => r.Field<string>("Kreditor Name"))
            .Distinct()
            .ToArray();

HashTable<string> hash = new HashTable<string>();
foreach(string item in customers)
{
    try
    {
        hash.Add(item);
    }
    catch(Eception)
    {
        // do nothing
    }
}

foreach(string item in customers2)
{
    try
    {
        hash.Add(item);
    }
    catch(Eception)
    {
        // do nothing
    }
}

How to make an array from different datasources?

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