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LINQ doesnt accept DataTable

Posted on 2009-05-06
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Last Modified: 2013-11-11
I have this code: (ds is DataSet)

DataTable dtRawData = ds.Tables[0];

        int iStateIDX = 1;

        for (int i = 0; i < dtRawData.Rows.Count; i++, iStateIDX++)
LINQ doesnt accept this code, because I can not implement AsEnumerable  in DataTable dtRawData = ds.Tables[0].AsEnumerable; it is an error
I can use only row collection
var rows = from p in ds.Tables[0].AsEnumerable()
foreach (var v in rows)
I need to use "int I" , but I cannot put rows.Count instead of dtRawData.Rows.Count in this statement:
for (int i = 0; i < dtRawData.Rows.Count; i++, iStateIDX++), it is an error
How can I use Data Table for LINQ, or insert rows.Count im this statement?

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Question by:J_Kogan
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Expert Comment

by:tculler
ID: 24319858
Remember, there are two types of DataTables-- System.Linq.DataTable, and System.Data.DataTable. Which are you using? The System.Linq one? Because that one is generic, and requires generic type parameters. I'm at school, so I can't test it (we're running the .NET Framework 2.0 right now, 'cuz the administration is severely disabled in EVERY way known to man).

Anyways, if you're using linq, you need to use its DataTable object. I believe it look ssomething like this...
System.Linq.DataTable<typeOfObjectsInTable> linqTable =
     new System.Linq.DataTable<typeOfObjectsInTable>();

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Author Comment

by:J_Kogan
ID: 24320138
I use System.Data.DataTable, may I use another one?
will be better?
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Expert Comment

by:tculler
ID: 24320602
You must use the Linq table type in your Linq statements. Otherwise, you're intermixing these two objects with totally different implementations.
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Accepted Solution

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Sreedhar Vengala earned 250 total points
ID: 24322093
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Expert Comment

by:ekekakos
ID: 24779460
As I found today the following I hope that will help you



Dim OrderedMaterials = From Material In DatasetPurchases.Tables("SelectMaterialsPacking").AsEnumerable(), _
PurchasedMaterial In DatasetPurchases.Tables("PurchaseMaterials").AsEnumerable() _
Where PurchasedMaterial!MaterialID_FK = Material!MaterialID And _
PurchasedMaterial!PurchaseID_FK = ListBoxControlPurchases.SelectedValue _
Select Material!MaterialID, Material!MaterialMnemonic, Material!MaterialDescription, Material!PackingMnemonic

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