I have a DataTable with multiple columns. I want to get a List<String> out of first column of DataTable. How can I do that?
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7 Answers
Try this:
static void Main(string[] args)
{
var dt = new DataTable
{
Columns = { { "Lastname",typeof(string) }, { "Firstname",typeof(string) } }
};
dt.Rows.Add("Lennon", "John");
dt.Rows.Add("McCartney", "Paul");
dt.Rows.Add("Harrison", "George");
dt.Rows.Add("Starr", "Ringo");
List<string> s = dt.AsEnumerable().Select(x => x[0].ToString()).ToList();
foreach(string e in s)
Console.WriteLine(e);
Console.ReadLine();
}
3 Comments
InteXX
Is anyone else getting a ReadOnly error on Columns?
GorvGoyl
how to retrieve data from a column "name"?
clamchoda
@JerryGoyal Late reply, but for anyone else wondering just replace
x[0] with x["Lastname"] . Lastname being the name of the column we're interested in.var list = dataTable.Rows.OfType<DataRow>()
.Select(dr => dr.Field<string>(columnName)).ToList();
[Edit: Add a reference to System.Data.DataSetExtensions to your project if this does not compile]
4 Comments
Jen Grant
AsEnumerable() works on a DataTable as well. var list = dataTable.AsEnumerable().Select(r => r.Field<string>(columnName)).ToList();
Brk
If
DataTable.AsEnumerable() does not compile, add a reference to System.Data.DataSetExtensions to your project.
chiapa
What if you don't know the
columnName?
Cengiz Araz
I would choose AsEnumerable() method instead of this. This is like holding the right ear with left hand.
Here you go.
DataTable defaultDataTable = defaultDataSet.Tables[0];
var list = (from x in defaultDataTable.AsEnumerable()
where x.Field<string>("column1") == something
select x.Field<string>("column2")).ToList();
If you need the first column
var list = (from x in defaultDataTable.AsEnumerable()
where x.Field<string>(1) == something
select x.Field<string>(1)).ToList();
Comments
Is this what you need?
DataTable myDataTable = new DataTable();
List<int> myList = new List<int>();
foreach (DataRow row in myDataTable.Rows)
{
myList.Add((int)row[0]);
}
1 Comment
AaA
Your answer is almost correct except, question is asking for names or
List<String>I make a sample for you , and I hope this is helpful...
static void Main(string[] args)
{
var cols = new string[] { "col1", "col2", "col3", "col4", "col5" };
DataTable table = new DataTable();
foreach (var col in cols)
table.Columns.Add(col);
table.Rows.Add(new object[] { "1", "2", "3", "4", "5" });
table.Rows.Add(new object[] { "1", "2", "3", "4", "5" });
table.Rows.Add(new object[] { "1", "2", "3", "4", "5" });
table.Rows.Add(new object[] { "1", "2", "3", "4", "5" });
table.Rows.Add(new object[] { "1", "2", "3", "4", "5" });
foreach (var col in cols)
{
var results = from p in table.AsEnumerable()
select p[col];
Console.WriteLine("*************************");
foreach (var result in results)
{
Console.WriteLine(result);
}
}
Console.ReadLine();
}
Comments
I do just like below, after you set your column AsEnumarable you can sort, order or how you want.
_dataTable.AsEnumerable().Select(p => p.Field<string>("ColumnName")).ToList();
Comments
1.Very Simple Code to iterate datatable and get columns in list.
2.code ==>>>
foreach (DataColumn dataColumn in dataTable.Columns)
{
var list = dataTable.Rows.OfType<DataRow>()
.Select(dataRow => dataRow.Field<string>
(dataColumn.ToString())).ToList();
}
1 Comment
PastExpiry.com
might want to mention that this 'simple' code requires .Net 4.5 or higher AND a nuget package which you have to install via "Install-Package System.Data.DataSetExtensions -Version 4.5.0"