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LINQ Query

520

Solutions

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Language Integrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages, although ports exist for Java, PHP, JavaScript and ActionScript. LINQ extends the language by the addition of query expressions, which are akin to SQL statements, and can be used to conveniently extract and process data from arrays, enumerable classes, XML documents, relational databases, and third-party data sources.

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Hi,
I need to create a report in SharePoint 2013 , on premises , There is a custom SharePoint list which has username, Manager and Status. say it SPLIst
I have created another SharePoint list as external content type using SQL procedure which returns all all active users. In this second list say DBList I have username and their department.
My requirement is , I need to compare the two lists and whoever is not found in SPList, should be marked as "Not Started".

Could you please help me to achieve this?

Thanks in advance.
Azra
0
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Hi,

How to write LINQ query to split and find the column min and maximum and return based on string values.

I done some code using LINQ, but it is not working.

what is the problem in my code.

Scenario is,

1. Split the string and find the column

2. Check the minimum and maximum range of each splitted string. (SUB C=100#SUB D=200)

3 range should check within the limit like 100 min and max

Hi,

How to write LINQ query to split and find the column min and maximum and return based on string values.

I done some code using LINQ, but it is not working.

what is the problem in my code.



 protected void Button_Click(object sender, EventArgs e)
    {

        
        string string1 = "SUB C=100#SUB D=200";

        string FinalOutput = "GRADE#SUB B";

        DataTable dt = new DataTable();
        dt.Columns.AddRange(new[] { new DataColumn("Studentno"),new DataColumn("GRADE"),new DataColumn("SUB B"), new DataColumn("SUB C(MIN)"), new DataColumn("SUB C(MAX)"),
new DataColumn("SUB D(MIN)") ,new DataColumn("SUB D(MAX)") ,new DataColumn("SUB C"),new DataColumn("FROM"),new DataColumn("TO") });
        dt.Rows.Add(101,"A", "100", "100", "200", "200", "300", null, 20, "100");
        dt.Rows.Add(101, "B", "100", "150", "250", "250", "350", null, 20, "100");
        dt.Rows.Add(101, "B", "100", "200", "300", "100", null, null, 20, "100");
        dt.Rows.Add(101, null, "100", "200", "300", "100", null, null, 20, "100");



        //Check whether a given 

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0
I have a collection of elements. Each element is identified by a string key composed of 6 string subkeys labeled A,B,C,D,E,F.

The full key is produced by concatenating together the 6 string subkeys and inserting a delimiter between each subkey. Say '.' is the delimiter character.

So a key might be "12.34.56.78.90.10"
and the subkeys are:
A=12
B=34
C=56
D=78
E=90
F=10

A subkey string may also be empty.
e.g.
A key might be "12.34.56.78"
and the subkeys are:
A=12
B=34
C=56
D=78
E=""
F=""

I wish to find a "best match" given specific values for A,B,C,D,E,F, where some of those values may be the empty string.

A "best match" is determined by the following:
For example, given A,B,C,D

  a. Look for an exact match to {A,B,C,D,-,-}
  b. Look for an exact match to {A,B,C,D,*,-}
  c. Look for an exact match to {A,B,C,D,*,*}
  d. Look for an exact match to {A,B,C,-,-,-}
  e. Look for an exact match to {A,B,-,-,-,-}
  f. Look for an exact match to {A,-,-,-,-,-}
  g. Give up.

- means the empty string ""
* means we'll accept anything that's not an empty string.

The general idea is if we don't have an exact match, then we first look deeper for a match, and if nothing is found, then we look shallower for a match, until we find a match or exhaust our options.

A few caveats:

If A=5 then do the above but ignore values B & C (accept anything including -)
If A=6 then do the above but ignore value C (accept anything including -)
If A=4 and D is …
0
I have been tasked with adding some very specific searching behaviour to a MVC application using Entity Framework.  

The searching should be able to get:

Entries with two or more words that are not just exactly next to each other. If they type in "The Revenge":
  • The Revenge
  • The Horrible Revenge
  • Revenge of the Machines

Parts of words. If they type in "Smith":
  • Mr and Mrs Smith
  • Meet the Smithsons
  • The Incredible Blacksmith

I have written the following method in my controller class:

public ActionResult Index(string searchString)
        {

            var films = from s in db.films
                        select s;

            if (!string.IsNullOrEmpty(searchString) && !searchString.Any(x => Char.IsWhiteSpace(x)))
            {
                searchString.Trim();
                films = films.Where(s => s.title.Contains(searchString)
                    || s.title.StartsWith(searchString)
                    || s.title.EndsWith(searchString)
                    || s.genre.Contains(searchString)
                    || s.genre.StartsWith(searchString)
                    || s.genre.EndsWith(searchString)
                    || s.synopsis.Contains(searchString)
                    || s.synopsis.StartsWith(searchString)
                    || s.synopsis.EndsWith(searchString)
            }
      

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0
ow to merge multiple list values in one list values.

For example,

List<string> List1 = new List<string> {"A","B","C"}; // Some times null value also

List <string> List2 = new List<string> {"D","E","F"}; // Some times null value also

List <string> List3=  null;  // Some times null value also

My Query is below :

 List<string> ArrAllValue = List1.Concat(List2.Concat(List3))
                                                               .Where(x => !string.IsNullOrEmpty(x)) //probably
                                                               .ToList();

Error : Value Cannot be null
0
I want to find the columns from my table based on my input string.

for example,

my table as below.



So, First i want to find the columns of "Lesson x SUB A" and the get the values of that..

My Result is = 400..

How to write LINQ Query or C# code..?

DataTable table = new DataTable();
table.Columns.Add("Lesson1 x SUB A");
table.Columns.Add("Lesson1 x SUB B");
table.Columns.Add("Lesson1 x SUB C");
table.Rows.Add(400,500,600);
table.Rows.Add(300, 400, 500);
table.Rows.Add(500, 600, 700);
string Findcolumns = "Lesson1 x SUB A";

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Below is the simple Query.

string result=table.Rows[0][Findcolumns].ToString();

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But, how to give where condition in the query.

because, i have "n" number of rows and i want to filter based on the conditions..

for example,

DataTable table = new DataTable();
table.Columns.Add("Lesson1 x SUB A");
table.Columns.Add("Lesson1 x SUB B");
table.Columns.Add("Lesson1 x SUB C");

table.Columns.Add("UNIT");

table.Rows.Add(400,500,600,205);
table.Rows.Add(300, 400, 500,300);
table.Rows.Add(500, 600, 700,400);

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Where unit = 400.
0
How to find the exact particulate word from a string using LINQ.

MyString = "10"-550-HO-004-01-12XVRU-XA";

MyPositionNo(Input)  : 4

Result : 004

MyPositionNo(Input)  : 1

Result : 10"

Also,

this is not matching word. This needs to be find the position (Index) of the string to get.

Example.

InputParam = 4 (it means 4th position of my string)

So, 4th position is : 004 (MyString = "10"-550-HO-004-01-12XVRU-XA")

004 ==> is my 4th position want to fetch.

1st position is : 10" (MyString = "10"-550-HO-004-01-12XVRU-XA")

10" ==> is my 1st position want to fetch.
0
Below codes is to return .net datatable, and I use asp.net repeater to bind it. everything is working except the list does not sort by date and time. The data source starts from query3.

Not sure why. and hope some experts can help out.

Thanks

var query3 = query1.Concat(query2).OrderBy(z => z.DateTimeSent);

           


             
public static DataTable GetConversation(string sid, string token,string accountPhoneNo, string twilioPhoneNo)
        {  
            string clientPhoneNo = string.Empty;
            string inputFilePath = filePathUserMessagesAll;
            DataTable dt = new DataTable();
            dt.Clear();
            dt.Columns.AddRange(new DataColumn[]
           {
                new DataColumn("Body",typeof(string)),
                new DataColumn("DateCreated",typeof(string)),
                new DataColumn("Direction",typeof(string)),
                new DataColumn("SelectedPhoneNo",typeof(string))
           });
            XDocument xdoc = null;
            using (XmlReader xr = XmlReader.Create(inputFilePath))
            {
                xdoc = XDocument.Load(xr);
                var query1 = from t in xdoc.Descendants("User")
                             where 
                             (
                             t.Element("From").Value.ToLower() == "+1" + accountPhoneNo.ToLower()
                             ) //client phone
                             select new
                             {
                   

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0
Hello Experts,
I need help converting a SQL query to LINQ, to use in my C#.Net application.
Please provide a query that returns a sql value, and one that returns a list (please see code below).

SELECT OutPutPath FROM  [dbo].[ProcCon] PC
INNER JOIN ProcType PT ON
PT.TypeID = PC.TypeID
WHERE PT.Name = 'TimeInterval'

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Thank you,
mrotor
0
Hi,

I done some sample code which should search matching record and display in specified format.

i am unable to get exact format.

my output is : 100,300 (because only matching ENGLISH H and MATHS L)

see my sample code's
0
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Hi Experts!

Need your help updating LINQ query.

The LINQ query should return a distinct record of locationId and phonenumber.
Then which need to extract locationId and phonenumber and store it in local variables.

SQL Query:

SELECT DISTINCT  
       personlocation.LocationID,
       phone.PhoneNumber
FROM dbo.personProducts pp
     INNER JOIN dbo.personPhonesLocations phoneLocation ON pp.personLocationRecID = phoneLocation.personLocationRecID
     INNER JOIN dbo.personLocations personlocation ON pp.personLocationRecID = personlocation.personLocationRecID
     INNER JOIN dbo.Phones phone ON phoneLocation.PhoneID = phone.PhoneID
     INNER JOIN dbo.PhoneTypes PhoneTypes ON pl.PhoneTypeID = PhoneTypes.PhoneTypeID
WHERE pp.PersonNumber = 'ABC123'
      AND PhoneTypes.PhoneTypeName = 'Contact Number'

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C# method:
var personPhone = (from pp in dataContext.personProducts
from phoneLocation in dataContext.personPhonesLocations
from personLocation in dataContext.personLocations
from phone in dataContext.Phones
from phoneType in dataContext.PhoneTypes
where pp.PersonNumber == "ABC123" && phoneType.PhoneTypeName == "Contact Number"
select new
{
LocationId = personLocation.LocationID,
phonenumber = phone.PhoneNumber
}).Distinct();


if (personPhone != null)
{
    string locationId = ???; <-- need help
    string phonenumber = ??  <-- need help

}

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TIA!
0
How to return row based on finding columns and its value

List<string> Str = [0] Sub A=100

                              [1] Sub B=80

now i want to find the column of Sub A and Sub B in my datatable.

If column found then find the row of the above column values for condition basis.

for example (as per example data table).

   Sub A value is 80 ==> this should check in between Sub A(MN) and Sub A(MX) &&
   Sub B value is 100 ==> this should check in between Sub B(MN) and Sub B(MX)

5. Final result would be return true/false (sample example returns true)

Tried below Query

                          string[] str = { "Sub A=80, Sub B=100"}; // Range should check between range of minimum and maximum of both subjects

  DataTable dt = new DataTable();
        dt.Columns.AddRange(new[] { new DataColumn("TYPE"),new DataColumn("Sub A(MN)"), new DataColumn("Sub A(MX)"), new DataColumn("Sub A(MN)"),
new DataColumn("Sub B(MX)") ,new DataColumn("Sub A") ,new DataColumn("Sub A1"),new DataColumn("FROM"),new DataColumn("TO"),new DataColumn("DEPT") });
        dt.Rows.Add(null, "100", "1000", "100", "100", null, null, 20, "100", "S6");
        dt.Rows.Add(null, "200", "2000", "200", "200", "200", "200", "35", "100", "S7");
        dt.Rows.Add(null, "100", "1000", "100", "100", "100", "100", "35", "100", "S7");
        dt.Rows.Add(null, "100", null, null, "100", "100", "100", "35", "100", "S7");
        dt.Rows.Add(null, "100", "1000", "100", null, null, "100",…
0
Hi,

How to find and search list values which is available or not from multiple another lists.

For example,

 List<string> FromList = new List<string>() { "Sub A", "Sub B" };
        List<string> List1 = new List<string>() { "Sub A=80", "Sub D=70" };
        List<string> List2 = new List<string>() { "Sub B=100", "Sub C=90" };

I want to take Fromlist and check this will be available or not in List1 and List2.

if it is available then it returns result as Sub A=80 and Sub B=100.

if it is not available in both list (List1 and List2) then it returns false.

How to form in LINQ Query..?
0
How to I add "or" to the following:

 var recordCount = db.tblWHQReports.Count(a => a.Mgr == employeeid);

??
0
Hi ,

I am passing list value into the datatable.

I want to find the column first and then check whether the value exist or not for that columns.

I want to write in LINQ Query as bool true/false

for example,

string str ABSCHECK = ABS A#ABS B // input value

string[] words1 = str.Split('#'); //Splitting the values

words1[0] ABS A //list

           [1] ABS B

The above two value is a column name and i want to check in the below table.

 DTTABLE :

A      ABS A(MN)      ABS A(MX)      ABS B(MN)      ABS B(MX)      ABS C(MN)      ABS C(MX)
100      100      100      100      100      100      100
For ABS A ==> Matching two columns and values present(like ABS A(MN) and ABS A(MX))

For ABS B ==> Matching two columns and values exists (like ABS B(MN) and ABS B(MX))

So i want to return result is true.

if nothing is matching, it means (column not identified and value not present) returns false.

How to write LINQ..?

below is my query

string str ABSCHECK = ABS A#ABS B // input value

string[] words1 = str.Split('#'); //Splitting the values

bool results = (from r in DTTABLE.AsEnumerable()
                           select r.Field<string>(words1.ToList())); // to find out columns and value

but not working..?
0
I have a record in sql server 2016 that has two time(0) columns.  I need to do a query with linq that returns the id when the current time is between the 2 stored times (starttime and endtime).

any help appreciated.

string now = DateTime.Now.ToString("HH:mm:ss");

            var result = (from s in db.Shifts
                          where s.StartTime >= DateTime.Parse(now) &&
                          s.EndTime <= DateTime.Parse(now)
                          select s.ShiftId);

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0
Hi Experts,
I need help setting a default value to 0, when the returned value is null, or 0.
I have tried the code below but I get a blank\empty field in my table.  See code below, and let me what I am doing wrong.

CODE
var paper = (db.Manifests.Where(m => m.ID == ID && m.ProcessedDate.Value.Month == DateTime.Today.Month).Sum(m => m.Claims != null  ? m.Claims : 0)).Value;
vals.Add((paper.ToString().Length > 0) ? string.Format("{0:###,###}", paper) : "0");

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Thank you,
mrotor
0
Hi,

I want to check some word which contains some + symbols. when i write the below query it should return true.

but, i am getting object reference error.

Also my condition is should check null value in column2 and column3

below is my code:


Inparam1 = "A+B";  
bool Result1 = DT1.AsEnumerable()
                               .Any(row => (row.Field<String>("Col1").contains(Inparam1)) && (row.Field<String>("col2") == null) && (row.Field<String>("col3") == null)));

The above code should return "TRUE" as per my below referring table. But, it returns "Object reference Error"

DT1 Table

Col1      Col2      Col3
A+B/D+EB              
A/D+EB              
A+B/X+A1              
A      2      3
what is the problem and where i want to change the code..?
0
i have a method that takes two datatable and does a inner join using LINQ and then i am using a where condition where i tell it to only give me the records where the status does not equal status from the other datatable but the values returned has matches. so what am i doing wrong in the code below?

DataTable RemoveCustomers = (from r in FirstDataTable.AsEnumerable()
                                         join s in SecondDataTable.AsEnumerable()
                                         on r.Field<string>("Customer") equals s.Field<string>("Customer")
                                         where r.Field<string>("STATUS").Trim() != s.Field<string>("STATUS").Trim()
                                         select s).CopyToDataTable();

  foreach (DataRow dr in RemoveCustomers.Rows)
            {
                
                // string cust = dr["Customer"].ToString();
                tblDiff.Rows.Add(dr["CUSTOMER"].ToString().Trim(), dr["NAME"].ToString().Trim(), replaceapostrophe(dr["ADDRESS"].ToString().Trim()), replaceapostrophe(dr["ADDRESS 2"].ToString().Trim()), replaceapostrophe(dr["CITY"].ToString().Trim()), dr["STATE"].ToString().Trim(), dr["ZIP CODE"].ToString().Trim(), dr["PARENT"].ToString().Trim(), dr["TELEPHONE"].ToString().Trim(), dr["FAX"].ToString().Trim(), dr["TERMS OF PAYMENT"].ToString().Trim(), dr["COUNTRY"].ToString().Trim(), dr["CURRENCY"].ToString().Trim(), "[b]4[/b]", dr["LONG"].ToString().Trim(), dr["LAT"].ToString().Trim(), 

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0
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how to get coming expires before 7 month  in linq
0
Receiving an error on var found.  The problem is that the first time the code is ran this.productModel is null.  the Linq statement is to verify if the product exists before adding the value again.  I can't write

var found;

Then check to see if product.model == null.

Any idea how to work around this?

public class GetProd
{
            public ObservableCollection<ProductModel> productModel { get; set; }
            
             public void GetTheProd(string Name)
             {
                  if (App.productModel != null)
                      this.productModel = new ObservableCollection<ProductModel>(App.productModel);
                   .........
                  var found = (from prod in this.productModel where prod.Name== name select prod).ToList();
             }
}

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0
I have BPM (Method Directive) in Epicor 10.1.600.

BO:  JobEntry

Method:  ChangeJobHeadProdTeamID

The user trigger its from the Job Entry screen by changing the "Prod Team" field.  The BPM has a Post-Processing directive, which looks like this:
foreach (var ttJobHead_Row in ttJobHead)  //ttJobHead
{
  using (var txScope = IceContext.CreateDefaultTransactionScope())
  {
    //get the header row and update it
    var jobheadrow = (from JobHead_Row in Db.JobHead.With(LockHint.UpdLock)
                      where JobHead_Row.Company == ttJobHead_Row.Company
                      && string.Compare(JobHead_Row.JobNum, ttJobHead_Row.JobNum, true) == 0
                      select JobHead_Row).FirstOrDefault();
               
               if (jobheadrow != null)
               {
                 jobheadrow.Serial_c = callContextBpmData.Character01;
                 jobheadrow.Height_c = Convert.ToInt32(callContextBpmData.Number01);
                 jobheadrow.Width_c = Convert.ToInt32(callContextBpmData.Number02);
                 jobheadrow.PaintColor_c = callContextBpmData.Character02;
                 
               } 
      
    }
    
    Db.Validate();
    txScope.Complete();    

  }
   
}

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It executes successfully, and brings me back to the Job Entry screen.  When I select "Save" on the Job Entry screen, I get the error:
error
I have tried putting in:
var jobEntryBO = Ice.Assemblies.ServiceRenderer.GetService<Erp.Contracts.JobEntrySvcContract>();
var currentJob = jobEntryBO.GetByID(ttJobHead_Row.JobNum);
this.dsHolder.Attach(currentJob);

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before the line:
txScope.Complete();

But still receive the error.  Would you know what is wrong here?
0
I have the following xml file that I would like to read in c#.

It should be simple but I am having a little trouble reading the 'Items' in the file.  I would like to read the code and description for each 'item' in the file.  I would like to use linq but as I said, I am having a little trouble.

As always, all help appreciated

Thanks

David


<?xml version="1.0" encoding="UTF-8" ?>
<examplepartner xmlns="http://www.example.com/example">
<BRAND>example</BRAND>
<Styles>
<Item>
<Code>A12345</Code>
<Description>Item 1</Description>
</Item>
<Item>
<Code>A987654</Code>
<Description>Item 2</Description>
</Item>
<Item>
<Code>A65987</Code>
<Description>Item 3</Description>
</Item>
</Styles>
</examplepartner>
0
Hello Experts.

I've successfully built quite a few LINQ queries in my Windows Form project thus far, but for some reason, I am not able to get the "For Each" code to recognize the fields I'm selecting. The error condition is "[FieldName] is not a member of 'System.Array' in LINQ Query".

I did my homework and found that I needed to add Imports System.Linq in my declarations, and sure enough it was missing (which I find strange since this has been working fine for all my other LINQ queries).

My primary objective with the code is a grab a Picture from a related table, and populate a PictureBox control with the result. Here's the code I've got right now:
Private Sub MyPlayerPicture()
    ' Process Picture separately to better handle Null values
    Dim APAID As Integer = CInt(Me.MyPlayersAPAID.Text)
    Dim GetPicture =
         (
             From RosterData In SNAPDataSet.RosterView
             Where Not RosterData.IsNull("Player_Picture")
             Select RosterData.Player_Picture
         ).ToList
    If GetPicture.Count = 0 Then
        Me.MyPlayersPicture.Image = My.Resources.Silhouette
    Else
        For Each row In GetPicture
            If row.APA_Player_ID = APAID Then
                Dim ppBlob() As Byte = row.Player_Picture
                Dim ppStream As New MemoryStream(ppBlob)
                Me.MyPlayersPicture.Image = Image.FromStream(ppStream)
                Exit Sub
            End If
        Next row
    End If
End Sub

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The lines with error conditions are the ones which reference row.[FieldName]. I can also confirm that Intellisense doesn't recognize row as associated with the .

I have tried several other permutations of the above before posting this including removing the Where clause, as well as fetching single records by setting the Where clause to "Where Not RosterData.IsNull("Player_Picture") AndAlso RosterData.APA_Player_ID = APAID".

BTW, this subroutine is called by its predecessor which populates other fields on the same form when the record is changed as shown here:

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0
I looked at some of the other related questions, but didn't find a good answer. My TSQL query works fine:

select PORel.ReqNum,PORel.ReqLine,XFiles.* from E10DB.Erp.PORel PORel
JOIN E10DB.Erp.ReqDetail ReqDetail ON ReqDetail.Company = @company AND 
      ReqDetail.ReqNum = PORel.ReqNum
JOIN E10DB.Ice.XFileAttch XFiles ON XFiles.Company = @company AND 
       XFiles.Key1 = CONVERT(nvarchar(50),ReqDetail.ReqNum)
WHERE PORel.PONum = @ponum    

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I would like to translate this into a LINQ result like:

var joinResultRows = from PORel , etc.,..........  

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so I can do loop through them to do something :
 foreach(var joinResult in joinResultRows)
 {
     string custID = joinResult.CustID;
     string ponum = joinResult.PONum;
 }    

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Any thoughts? Thanks!
0

LINQ Query

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Solutions

384

Contributors

Language Integrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages, although ports exist for Java, PHP, JavaScript and ActionScript. LINQ extends the language by the addition of query expressions, which are akin to SQL statements, and can be used to conveniently extract and process data from arrays, enumerable classes, XML documents, relational databases, and third-party data sources.

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