logo
down
shadow

C# Linq Groupby and Where


C# Linq Groupby and Where

By : Hieloco
Date : November 22 2020, 11:12 AM
Does that help I have a custom list, shown below.
code :
.Where(x=> x.EventDescription == "AQ")
.GroupBy(x => new { x.dtDate.Date, x.EventDescription})


Share : facebook icon twitter icon
GroupBy without LINQ

GroupBy without LINQ


By : user2140549
Date : March 29 2020, 07:55 AM
hope this fix your issue I am trying to achieve the following without LINQ: , You probably want something like this:
code :
Dictionary<int, List<CenterDetail>> map = new Dictionary<int, List<CenterDetail>>();
foreach (CenterDetail detail in details)
{
    List<CenterDetail> list;
    if (!map.TryGetValue(detail.AreaID, out list)
    {
        list = new List<CenterDetail>();
        map.Add(detail.AreaID, list);
    }
    list.Add(detail);
}
return map;
Custom LINQ GroupBy helper erroring with "This function can only be invoked from LINQ to Entities."

Custom LINQ GroupBy helper erroring with "This function can only be invoked from LINQ to Entities."


By : Akhil Sharma
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I'm attempting to make a GroupBy helper overload to simplify a common reporting case: Grouping by date (day, week, month, year, etc.) ,
I'm really close
code :
static Expression<Func<TSource, ReportDate>> ToReportDate<TSource>(Expression<Func<TSource, DateTime>> keySelector, ReportDateType dateType)
{
    var source = keySelector.Parameters[0];
    var member = keySelector.Body;
    var year = Expression.Property(member, "Year");
    var month = dateType == ReportDateType.Day || dateType == ReportDateType.Week || dateType == ReportDateType.Month ? (Expression)
        Expression.Property(member, "Month") :
        Expression.Constant(0);
    var week = dateType == ReportDateType.Day || dateType == ReportDateType.Week ? (Expression)
        Expression.Convert(Expression.Call(typeof(SqlFunctions), "DatePart", null,
        Expression.Constant("week"), Expression.Convert(member, typeof(DateTime?))
        ), typeof(int)) :
        Expression.Constant(0);
    var day = dateType == ReportDateType.Day ? (Expression)
        Expression.Property(member, "Day") :
        Expression.Constant(0);
    var dateSelector = Expression.Lambda<Func<TSource, ReportDate>>(
        Expression.MemberInit(
            Expression.New(typeof(ReportDate)),
            Expression.Bind(typeof(ReportDate).GetProperty("Year"), year),
            Expression.Bind(typeof(ReportDate).GetProperty("Month"), month),
            Expression.Bind(typeof(ReportDate).GetProperty("Week"), week),
            Expression.Bind(typeof(ReportDate).GetProperty("Day"), day)
        ), source);
    return dateSelector;
}
static IEnumerable<TResult> GroupByDate<TSource, TResult>
(
    IQueryable<TSource> source,
    DateTime startDate,
    DateTime endDate,
    ReportDateType dateType,
    Expression<Func<TSource, DateTime>> keySelector,
    Expression<Func<IGrouping<ReportDate, TSource>, TResult>> resultSelector
)
where TResult : ReportRow, new()
{
    var results = source
        .GroupBy(ToReportDate(keySelector, dateType))
        .OrderBy(g => g.Key)
        .Select(resultSelector);
    // the rest of the code
}
var results = GroupByDate(db.Orders, startDate.Value, endDate.Value, ReportDateType.Week, k => k.DateOrdered,
    g => new RevenueReportRow() { Date = g.Key, Revenue = g.Sum(i => i.Total), Cost = g.Sum(i => i.Cost), Profit = g.Sum(i => i.Total) - g.Sum(i => i.Cost) });
linq groupby() and Sum()

linq groupby() and Sum()


By : Jash
Date : March 29 2020, 07:55 AM
wish helps you This is probably quite trivial but I can't get it to work (linq level novice). , Check this one:
code :
var summary = (from image in images
               group image by new { image.ClientName, 
                                    image.PolicyType,
                                    BackupDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0)
                                                .AddSeconds(image.BackupTime)
                                                .ToString("MM/dd/yyyy", CultureInfo.InvariantCulture)
                                  } into imageGroup
               select new { ClientName = imageGroup.Key.ClientName, 
                            PolicyType = imageGroup.Key.PolicyType,
                            BakupDateTime = imageGroup.Key.BackupDateTime,
                            SumGBytes = imageGroup.Sum(s => s.KBytes) / 1048576.0,
                            AvgGBytes = imageGroup.Average(s => s.KBytes) / 1048576.0,
                            MaxGBytes = imageGroup.Max(s => s.KBytes) / 1048576.0,
                            Records = imageGroup.Count()
                          }
              ).ToList();
var listWithDateTime = (from image in images
                        orderby image.ClientName ascending, 
                                image.PolicyType ascending, 
                                image.BackupTime ascending
                        select new { 
                                 ClientName = image.ClientName,
                                 PolicyType = image.PolicyType,
                                 GBytes = image.KBytes / 1048576.0,
                                 UnixTimestamp = image.BackupTime,
                                 NormalDate = new DateTime(1970, 1, 1, 0, 0, 0, 0)
                                            .AddSeconds(image.BackupTime)
                                            .ToString("MM/dd/yyyy", CultureInfo.InvariantCulture) 
                               }
                       ).ToList();
multiple Groupby on result of GroupBy Linq

multiple Groupby on result of GroupBy Linq


By : Abhinav Chittibomma
Date : March 29 2020, 07:55 AM
wish helps you Basically you need to generate XML. One solution can be to recursively do GroupBy and create XMLDocument directly.
Here is a helper class that can do that.
code :
public class XmlGenerator
{
    private XmlDocument _document;
    private List<string> _fields;
    private int index = 0;

    public XmlGenerator(List<string> fields)
    {
        _fields = fields;
    }

    public void GenerateXML(IEnumerable<Foo> lookupData, XmlElement root, string field)
    {
        var fieldGrouping = lookupData.GroupBy(v => v.Bars.First(x => x.Name == field).Value);
        foreach (var grouping in fieldGrouping)
        {
            var element = _document.CreateElement(field);
            var attrib = _document.CreateAttribute("value");
            attrib.InnerText = grouping.Key;

            element.Attributes.Append(attrib);
            root.AppendChild(element);

            // If that is last field. No need to do any grouping.
            if (index < _fields.Count - 1)
            {
                // After each nested call update the nested level.
                // If GenerateXML do another that will be upon next nested level
                index += 1;
                GenerateXML(grouping, element, _fields[index]);
                index -= 1;
                // Make sure to change back nested level index otherwise that will not works if you have multiple groups.
            }
        }
    }

    public string GenerateXML(IEnumerable<Foo> lookupData)
    {
        _document = new XmlDocument();
        var root = _document.CreateElement("Root");
        _document.AppendChild(root);
        index = 0;

        GenerateXML(lookupData, root, _fields[index]);

        return _document.OuterXml;
    }
}
Linq SQL - How to use GroupBy Clause in linq even when i don't need aggregate function

Linq SQL - How to use GroupBy Clause in linq even when i don't need aggregate function


By : ej wm
Date : March 29 2020, 07:55 AM
I wish this help you I have admission table which contains the following data :
code :
Db.Admissions.OrderBy(od=>od.ClassID)
Related Posts Related Posts :
  • Replace a # character with a space and a # character
  • DataGrid SelectedItem and CurrentItem on row change and on loosing focus
  • Parse Json to class with C#
  • Publish .exe with Visual Studio Mac
  • c# out causing a no overload for method error?
  • Which Thread resume the method execution after await in Asp.net Web application
  • How to open Asp.Net project in another computer
  • Azure app registrations - SQL Server permission for C# App
  • How to Submit String with 536000 Characters to API
  • Server side TcpClient's stream.read gets no data when a different client (connected to the same port) sends data
  • Add combo-box in windows form grid view by using LINQ query
  • Remove XLL addin when multiple XLL addins are installed
  • Deserialize dynamic json into generic .NET object
  • How to search node in Jobject
  • Iron Webscraper connects to host but doesn't scrape?
  • Change values from textbox at the touch of a button
  • Data access structure with Entity Framework
  • Link Assemblys failed unexpectedly (Xamarin.ios.dll)
  • ASP.NET Core Razor pages - not binding on POST Request
  • How to update appsettings.json from wix custom actions with the values passed as parameter during command line installat
  • Load undefined images from folders
  • How to add a new button in title bar next the minimize button in UWP?
  • Missing DLL in docker image after copying published tree inside
  • One of the identified items was in an invalid format
  • TLS1.2 does not exist with .NET v4.7
  • How do I parse a XML document into object models?
  • Why is a conditional style being set on a html element by Razor is always html encoded incorrectly
  • Counting the amount of repetitions a letter has in a string
  • How to get the encoding of a file in a repository git via C#?
  • Communication between an Azure web application and a windows form app on Azure VM
  • WCF Service - Client receiving CommunicationException after many requests to localhost
  • How to correctly view pdf in browser using DotVVM?
  • Reading part of json into c# object
  • YoutubeAPI v3 - Setting thumbnail returns Completed status, but no thumbnail is set on video
  • Using the SimpleInjector, is it possible to get a singleton by its implementation type?
  • Why the LogLevel rule is not set for my NLog?
  • Converting short? to TimeSpan
  • Publish build artifact through build.cake instead of Azure Devops
  • Unable to get new token using JWT method (C#)
  • Running HttpRequest synchronously C#
  • How to avoid format in "XDocument.Parse(strHtml)"
  • How to update naviation property with new values in EF Core?
  • Queued function not executing with dequeue
  • How to Control Sequence of columns automatically Generated in DataGrid
  • Getting error when try to add a file from library to main project?
  • Aggregate Roots DDD/UoW/Repo/Service
  • How to change the horizontal movement direction of the player in Unity2D?
  • Getting a two dimensional array of all possible unique combination of numbers lower than a mixmum for each cell starting
  • How to get LDAP nested groups from attribute
  • Get array consisting of first values of a list of tuples
  • How do I pass information from my View to my Controller as a Parameter
  • UWP BarcodeScanner Preview: CaptureElement doesn't show any Preview
  • How to register open generic with custom factory method?
  • Change image via in scriptable object in Unity
  • Decreasing value of one float when other go up
  • Xceed CheckComboBox not properly showing selected values from items hardcoded in XAML
  • Why does char array display contents on console while string and int arrays dont in c#?
  • How to prevent custom filters twice calls?
  • c#: remove brackets of certain size if existing including its content
  • Is there a simple way of handling nested Dictionary<string, object> types where object is either string or another
  • shadow
    Privacy Policy - Terms - Contact Us © festivalmusicasacra.org