I want to group in Datatable by Name, LastName and the rest should be in same row. Can someone help me with it?
My DataTable:
Name LastName 1 3 2
kiki ha FF
lola mi AA
ka xe UU
kiki ha SS
I want to have DataTable group by Name:
Name LastName 1 3 2
kiki ha FF SS
lola mi AA
ka xe UU
My new code:
var result11 = from t1 in newtable.AsEnumerable()
group t1 by new { Name = t1.Field<String>("Name"), LastName = t1.Field<String>("LastName") } into grp
select new
{
Name = grp.Key.Name,
LastName = grp.Key.LastName,
//Something must be there
};
Add these lines instead of the comment (//something must be there):
C1 = String.Join(",", grp.Select(r=>r.Field<String>("1"))),
C2 = String.Join(",", grp.Select(r=>r.Field<String>("2"))),
C3 = String.Join(",", grp.Select(r=>r.Field<String>("3")))
to get three new columns on the output that aggregate values from the columns 1, 3 and 2.
If you have multiple values in one of the columns for a group, all the values will be shown and separated by comma (,).
If you are sure that there's at most one value per column per group, then you can simply do:
C1 = grp.Max(r => r.Field<String>("1")),
C3 = grp.Max(r => r.Field<String>("3")),
C2 = grp.Max(r => r.Field<String>("2"))
If you want a DataTable as result, this gives your desired result:
var lastNameGroups = from row in table1.AsEnumerable()
group row by new {
Name= row.Field<String>("Name"),
LastName = row.Field<String>("LastName")
} into LastNameGroups
select LastNameGroups;
var table2 = table1.Clone();
foreach (var lng in lastNameGroups)
{
var row = table2.Rows.Add();
row.SetField("Name", lng.Key.Name);
row.SetField("LastName", lng.Key.LastName);
var ones = lng.Where(r => !string.IsNullOrEmpty(r.Field<String>("1")));
if(ones.Any())
row.SetField("1", ones.First().Field<String>("1"));
var twos = lng.Where(r => !string.IsNullOrEmpty(r.Field<String>("2")));
if (twos.Any())
row.SetField("2", twos.First().Field<String>("2"));
var threes = lng.Where(r => !string.IsNullOrEmpty(r.Field<String>("3")));
if (threes.Any())
row.SetField("3", threes.First().Field<String>("3"));
}
Related
I want to retrieve data by group two columns ( Parent_Id and Name ) using LINQ and get the result only the rows with the same group by values.
Child
---------
Id Parent_Id Name
1 1 c1
2 1 c2
3 2 c1 <-----
4 2 c1 <-----
5 3 c2
6 3 c3
7 4 c4 <-----
As you can see, for Parent_Id 1 and 2, Name are different. So, I don't what those rows.
The result I want is like
Parent_Id Name
2 c1
4 c4
What I have tried is
from c in Child
group c by new
{
c.Parent_Id,
c.Name
} into gcs
select new Child_Model()
{
Parent_Id = gcs.Key.Parent_Id,
Name= gcs.Key.Name
};
But it return all rows.
As you describe it you should group by Parent_id only and get the groups that have distinct Names:
var result = children
.GroupBy(c => c.Parent_Id)
.Where(g => g.Select(t => t.Name).Distinct().Count() == 1)
.Select(g => new
{
Parent_Id = g.Key,
Name = g.Select(c => c.Name).First()
});
Reduced to final edit as per Gert Arnold's request:
var result = from r in (from c in children
where !children.Any(cc => cc.Id != c.Id &&
cc.Parent_Id == c.Parent_Id &&
cc.Name != c.Name)
select new {
Parent_Id = c.Parent_Id,
Name = c.Name
}).Distinct().ToList()
select new Child_Model
{
Parent_Id = r.Parent_Id,
Name = r.Name
};
var myModel = Child.GroupBy( c => $"{c.Parent_Id}|{c.Name}",
(k, list) => new Child_Model{
Parent_Id = list.First().Parent_Id,
Name = list.First().Parent_Id,
Count = list.Count()})
.Max (cm => cm.Count);
You can add a condition to filter result (groupName.Count() > 1):
from c in childs
group c by new { c.Parent_Id, c.Name } into gcs
where gcs.Count() > 1
select new { gcs.Key.Parent_Id, gcs.Key.Name }
I joined a 2 data tables based on the EMP column and used copytodatatable, however when i load the new datatable into datagridview it only shows the joined columns(salarydt) from the query, why is this??
var collection = from p in dt.AsEnumerable()
join q in salaryDT.AsEnumerable() on p.Field<int>("Emp") equals q.Field<int>("Emp1") into UP
from t in UP
select t;
DataTable resultdt = new DataTable();
dt = collection.CopyToDataTable();
DataTable itself is perfectly geared to merging itself with another data table, using its, well, Merge method. Here's a litte example:
var dt1 = new DataTable("a");
dt1.Columns.Add("ID", typeof(int));
dt1.Columns.Add("Item1", typeof(int));
dt1.PrimaryKey = new[] { dt1.Columns[0] };
var dt2 = new DataTable("a");
dt2.Columns.Add("ID", typeof(int));
dt2.Columns.Add("Item2", typeof(int));
dt2.PrimaryKey = new[] { dt2.Columns[0] };
for (int i = 0; i < 10; i++)
{
dt1.Rows.Add(new object[] { i, i });
dt2.Rows.Add(new object[] { i, i + 10 });
}
dt1.Merge(dt2);
Now dt1 has three columns, ID, Item1, and Item2.
ID Item1 Item2
0 0 10
1 1 11
2 2 12
3 3 13
4 4 14
5 5 15
6 6 16
7 7 17
8 8 18
9 9 19
Maybe what you should to do is just return a custom list of items:
Option 1
var data = new Employee[] { new Employee { Id = 1, Name = "John Doe" } };
var data2 = new Salary[] { new Salary { Id = 1, Wage = "$ 50,000.00" } };
var collection = from p in data
join q in data2 on p.Id equals q.Id
select new { Id = p.Id, Name = p.Name, Wage = q.Wage };
Please check the example: link
Option 2
var data = new Employee[] { new Employee { Id = 1, Name = "John Doe" } };
var data2 = new Salary[] { new Salary { Id = 1, Wage = "$ 50,000.00" } };
var collection = from p in data
join q in data2 on p.Id equals q.Id
select new { p, q };
I've a datatable named which contains data with a column of ID, firstname, lastname. Another datatable contains columns of code, userID1, userID2, userID3, work.
Now i want a new datatable which should contain the column of both the datatable with proper data.
New datatable should contain data as: ID, userfullname1, userfullname2, userfullname3, work.
Here we get the value of userfullname1 by firstname, lastname of datatable1 & userID1 of datatable2. Similarly we get the value of userfullname2 by firstname, lastname of datatable1 & userID2 of datatable2 & so on.
The value of ID in Datatable1 is same as userID1, userID2, userID3 in Datatable2.
Finally, i want to obtain a new datatable with code, userfullname1, userfullname2, userfullname3, work. But users IDs are in datatable1. So, i want to bind the names of Datatable1 to the all 3 userids of Datatable2 via their IDs whichare present in both the tables.
Datatable1 :
iD name
1 b
2 d
3 f
4 s
....
Datatable2 :
Code userid1 userid2 userid3 work
1f 1 3 6 gg
2g 1 4 7 gg
3b 3 4 7 gg
4v 4 3 8 gg
New Datatable :
Code username1 username2 username3 work
1f a b c gg
2g d f r gg
3b c h g gg
4v d s h gg
How can i join & get the new datatable ?
It sounds like you have a table with User Ids and you want to join your profile table to get those names. You can do this with sub-queries like:
var myTable = UserIds.Select(u => new
{
User1FullName = u.UserProfiles.FirstOrDefault(p => p.UserId == u.userId1).Select(p => p.FirstName + " " + p.LastName),
User2FullName = u.UserProfiles.FirstOrDefault(p => p.UserId == u.userId2).Select(p => p.FirstName + " " + p.LastName)
// etc...
});
You can do it with joins like:
var myTable = (from u in UserIds
join p1 in UserProfiles on u.UserId1 equals p1.UserId
join p2 in UserProfiles on u.UserId2 equals p2.UserId
// etc...
select new
{
User1FullName = p1.FirstName + " " + p1.LastName,
User2FullName = p2.FirstName + " " + p2.LastName,
// etc...
});
You can use LINQ to achieve what you want:
DataTable tblResult = new DataTable();
tblResult.Columns.Add("ID");
tblResult.Columns.Add("userfullname1");
tblResult.Columns.Add("userfullname2");
tblResult.Columns.Add("userfullname3");
tblResult.Columns.Add("Work");
var query = from r1 in datatable1.AsEnumerable()
from r2 in datatable2.AsEnumerable()
let id = r1.Field<int>("ID")
let userID1 = r2.Field<int>("userID1")
let userID2 = r2.Field<int>("userID2")
let userID3 = r2.Field<int>("userID3")
where id == userID1 && id == userID2 && id == userID3
select new { r1, r2, id, userID1, userID2, userID3 };
foreach (var x in query)
{
DataRow row = tblResult.Rows.Add();
string firstName = x.r1.Field<string>("firstname");
string lastName = x.r1.Field<string>("lastname");
string userfullname1 = string.Format("{0} {1} {2}", firstName, lastName, x.userID1);
string userfullname2 = string.Format("{0} {1} {2}", firstName, lastName, x.userID2);
string userfullname3 = string.Format("{0} {1} {2}", firstName, lastName, x.userID3);
row.SetField("ID", x.id);
row.SetField("userfullname1", userfullname1);
row.SetField("userfullname2", userfullname2);
row.SetField("userfullname3", userfullname3);
row.SetField("Work", x.r2.Field<string>("Work"));
}
If you just want your resulting table to have name and id, you should do it like this:
DataTable dtResult = new DataTable();
dtResult.Columns.Add("ID", typeof(string));
dtResult.Columns.Add("name", typeof(string));
var result = from datatable1 in table1.AsEnumerable()
join datatable2 in table2.AsEnumerable()
on datatable1.Field<string>("ID") equals datatable2.Field<string>("userID")
select dtResult.LoadDataRow(new object[]
{
datatable1.Field<string>("ID"),
string.Format("{0} {1}" ,datatable1.Field<string>("fname") ,datatable1.Field<string>("lname")),
}, false);
result.CopyToDataTable();
I have a trouble with Linq Join. I want to join 2 tables, which they have same structure with n-columns. My problem is i don't know the names of those columns, so how can i rewrite those in select new?
Table 1: Here I have some parameters in ID, Name and LastName. Comment, Attribute and the rest are null
ID Name LastName Comment Attribute ...
"what" "ABC" ...
"hello" "SDE" ...
3 lola
1 de
4 miki
... ... ... ...
Table 2: Here is the same like Table 1 but it has some parameters in Comment, Attribute and the Rest.
ID Name LastName Comment Attribute ...
"what" "ABC" ...
"hello" "SDE" ...
1 de "hi"
4 miki "OKK"
3 lola "yo" "LL"
Result: I would like to have joined Table like this
ID Name LastName Comment Attribute ...
"what" "ABC" ...
"hello" "SDE" ...
3 lola "yo" "LL"
1 de "hi"
4 miki "OKK"
... ... ... ... ... ...
My Code would be:
var Result= from tb1 in table1.AsEnumerable()
join tb2 in tabl2.AsEnumerable()
on new
{
Name = tb1.Field<String>("Name"),
LastName = tb1.Field<String>("LastName"),
} equals new
{
Name=tb2.Field<String>("Name"),
LastName=tb2.Field<String>("LastName"),
}
into grp1
from tb3 in grp1.DefaultIfEmpty()
select new
{
ID = tb1.Field<String>("ID"),
Name = tb1.Field<String>("Name") ,
LastName = tb1.Field<String>("LastName"),
Comment = tb3!= null ? tb3.Field<String>("Comment") : null,
Attribute= tb3!= null ? tb3.Field<String>("Attribute") : null,
...
// Here should be next Columns Name but don't know how to put there
};
I tried with this code but my compiler just hanged out, dont know why
for (int i = 2; i < table1.Rows.Count; i++)
{
foreach (DataRow dr in table2.Rows)
{
if ((table1.Rows[i]["Name"].ToString() == dr["Name"].ToString())&&table1.Rows[i]["LastName"].ToString() == dr["LastName"].ToString())
{
table1.Rows.RemoveAt(i);
table1.ImportRow(dr);
}
}
}
dataGridView1.DataSource = table1;
For each row1 in table1, if there is a matching row2 in table2, use row2. Otherwise, use row1.
var newTable = table1.Clone();
foreach (DataRow row1 in table1.Rows) // To skip the first 2, use table1.Rows.Cast<DataRow>().Skip(2)
{
var row = table2.Rows.Cast<DataRow>().FirstOrDefault(row2 =>
row1["Name"].ToString() == row2["Name"].ToString() &&
row1["LastName"].ToString() == row2["LastName"].ToString()) ?? row1;
newTable.ImportRow(row);
}
dataGridView1.DataSource = newTable;
How about joining as you did and then copying the three known fields from table1's rows to table2's rows?
var copiedTable2 = table2.Copy(); // Copy table2 if you don't want it to be modified
var items = from tb1 in table1.AsEnumerable()
join tb2 in copiedTable2.AsEnumerable()
on new
{
Name = tb1.Field<String>("Name"),
LastName = tb1.Field<String>("LastName"),
} equals new
{
Name=tb2.Field<String>("Name"),
LastName=tb2.Field<String>("LastName"),
}
into grp1
from tb3 in grp1.DefaultIfEmpty()
select new
{
ID = tb1.Field<String>("ID"),
Name = tb1.Field<String>("Name") ,
LastName = tb1.Field<String>("LastName"),
Row = tb3 ?? table2.NewRow();
};
foreach(var item in items)
{
item.Row.SetField<String>("ID", item.ID);
item.Row.SetField<String>("Name", item.Name);
item.Row.SetField<String>("LastName", item.LastName);
}
var rows = items.Select(x => x.Row);
// How to set the rows as a DataGridView's DataSource
var result = table2.Clone();
foreach(var row in rows)
{
result.Rows.Add(row.ItemArray);
}
dataGridView.DataSource = result;
Try this, no need of using loops
var resultTable = from tb1 in table1.AsEnumerable()
join tb2 in tabl2.AsEnumerable()
on tb1["Name"].ToString() equals tb2["Name"].ToString()
where tb1["LastName"].ToString() == tb2["LastName"].ToString()
select r;
DataTable resultTable =result.CopyToDataTable();
I have some problems and don't know what to do, can someone help me please?
I have a table like that:
ID Name Produkt Comment aa bb
1 Mike AA YY x
1 Mike AA YY x
I want to group with linq the result like to have Mike but just in one line
1 Mike AA YY x x
My code:
var results = from t1 in table.AsEnumerable()
join tb2 in table2.AsEnumerable()
on t1.Field<string>("Name") equals tb2.Field<string>("Name") into prodGroup
from table4 in prodGroup.DefaultIfEmpty()
select new
{
ID = t1.Field<Int32?>("ID"),
Name = t1.Field<String>("Name"),
Produkt = t1.Field<String>("Produkt"),
Attribute = t1.Field<String>("Attribute"),
Comment = table4 != null ? table4.Field<String>("Comment") : null,
};
foreach (var r in results)
{
var productIndex = result.Columns.IndexOf(r.Attribute);
var vals = new List<object>() { r.ID, r.Name, r.Produkt, r.Comment };
for (int i = 4; i < result.Columns.Count; i++)
{
if (i == productIndex)
{
vals.Add(true);
}
else
{
vals.Add(false);
}
}
result.LoadDataRow(vals.ToArray(), true);
}
Try this:
var result = from t1 in table.AsEnumerable()
group t1 by t1.Name into t1group
select new
{
Name = t1group.FirstOrDefault().Name
,ID = t1group.FirstOrDefault().ID
,Product = t1group.FirstOrDefault().Product
,Comment = t1group.FirstOrDefault().Comment
,aa = (t1group.Select(x => x.aa??"" + x.bb??"")).Aggregate((a, b) => (a + ", " + b))
};