Get rows on a condition from dbcontext entity into datatable using LINQ

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Hi,

Im a beginner in LINQ and Entity Framework

Iam using database approach in Entity Framework 6.0 and this c# code for fetching all records with matching date or matching a login name into another DataTable.

var obj = oContext.systevents.Where(r => r.date == Convert.ToDateTime(mdate));

or 

var obj = oContext.systevents.Where(r => r.login == "sara");

Im expecting the output as a set of matching rows into a datatable. My problem is that I am not able to CopyToDataTable Please guide me on this.

Thanks in advance.

What I have tried:

tried like this also..

var obj = oContext.systevents.AsEnumerable().Select(r => r.login == "sara")

Searched... but didn't find a suitable link.

Posted 10-Jan-19 23:39pm

Priya-Kiko

Updated 11-Jan-19 0:14am

v3

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Maciej Los 11-Jan-19 5:53am

You should know that DateTime structure returns date and time parts. So, there's minimal chance to get exact match. I think, you should remove time part or create where statement based on date and time between 00:00.00 - 23:59.59.

Priya-Kiko 11-Jan-19 5:59am

Thanks, I understand, Its not with the date time or any condition, its just iam not able to use the CopyToDataTable extension.

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Maciej Los · Accepted Answer · 2019-01-11T00:14:00

Try to use DataTable.LoadDataRow Method (System.Data) | Microsoft Docs[^] together with DataTableExtensions.CopyToDataTable Method (System.Data) | Microsoft Docs[^]. Note: you have to create a desired datatable first!

C#

DataTable destdt = new DataTable();
destdt.Columns.AddRange(new DataColumn[]
    {
        new DataColumn("Field1", typeof(int)),
        new DataColumn("Field2", typeof(string)),
        ...
        new DataColumn("FieldN", typeof(string)),
    });

destdt = oContext.systevents.AsEnumerable()
    .Where(r => r.login == "sara")
    .Select(x => destdt.LoadDataRow(new object[]
    {
        x.Field1, 
        x.Field2,
        ...
        x.FieldN
    }, false)
    .CopyToDataTable();

For further details, please see:
How to: Implement CopyToDataTable<T> Where the Generic Type T Is Not a DataRow | Microsoft Docs[^]