Asp Forum - 為雑兵敬服種無し乗用車生き延びるカウンタ

Ziangi Jones

1/29/2014 11:45:00 PM

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4 Answers

Patrice

4/8/2008 5:17:00 PM

A LINQ query represents a query. You can't cast a query to a datatable
exactly as you couldn't cast a SqlCommand object to a DataTable...

Try :
http://msdn2.microsoft.com/en-us/library/bb3... (CopyToDataTable
method). It shoudl execute the query and create a datatable from the results
(never used it but remembered to have seen this).

---
Patrice

"Dean Slindee" <slindee@charter.net> a ?crit dans le message de news:
51277F5B-9EEE-4DD7-9CF4-007C567E0232@microsoft.com...
> Here is the Cast statement I would like to use:
> Dim dt As DataTable
> dt = CType(query.Cast(Of tblAdminAddressType)(),
> System.Data.DataTable)
>
> Perhaps my approach is in error, as today it produces this result:
> Exception Type: System.InvalidCastException
> Exception Message: Unable to cast object of type
> 'System.Data.Linq.DataQuery`1[Admin.tblAdminAddressType]' to type
> 'System.Data.DataTable'.
>
>
> "Cor Ligthert[MVP]" <notmyfirstname@planet.nl> wrote in message
> news:9E778EF3-502A-44B8-85D5-543239919447@microsoft.com...
>> Dean,
>>
>> The listview is in noway an AdoNet control, while Linq is only AdoNet as
>> it is for Linq to AdoNet
>>
>> Why not use bindable controls as meant for those. The listview is an old
>> verhicle basicly for things as windows explorer and more like that. The
>> bindable controls where probably not created as it was possible with
>> something that is from far in the past millenium.
>>
>> However if you want to use a control as old as almost a T Ford, than make
>> it workable, but that has no purpose for others, who just use
>> DataBindable controls as they want to DataBind.
>>
>> Cor
>>
>> "Dean Slindee" <slindee@charter.net> schreef in bericht
>> news:DE390062-BED1-42EC-9B5D-88E4546A1BB1@microsoft.com...
>>> Currently using a legacy Winform listview, that is filled by a function
>>> from datatable(0) in a dataset. This works fine as the datatable has
>>> column headers and data rows that correspond to listview headers and
>>> listview rows.
>>>
>>> Would like to use Linq to SQL to populate the same legacy WinForm
>>> listview. The code below retrieves the IOrderedQuery object correctly:
>>> Dim dc As New dcAdminDataContext
>>> Dim query = From tblAdminAddressType In
>>> dc.tblAdminAddressTypes _
>>> Order By tblAdminAddressType.AddressTypeID
>>> gvwAdminData.DataSource = query
>>>
>>> The last statement fills a datagridview thru the .DataSource property.
>>> Since, a listview has no .DataSource property, I am at an impasse as to
>>> how to convert query to a datatable, or ? I do not want to specify the
>>> data column names within each query nor declare a class for the query
>>> structure. Any ideas?
>>>
>>> Thanks in advance,
>>> Dean S
>>
>

Dean Slindee

4/8/2008 7:00:00 PM

Here is the Cast statement I would like to use:
Dim dt As DataTable
dt = CType(query.Cast(Of tblAdminAddressType)(),
System.Data.DataTable)

Perhaps my approach is in error, as today it produces this result:
Exception Type: System.InvalidCastException
Exception Message: Unable to cast object of type
'System.Data.Linq.DataQuery`1[Admin.tblAdminAddressType]' to type
'System.Data.DataTable'.

"Cor Ligthert[MVP]" <notmyfirstname@planet.nl> wrote in message
news:9E778EF3-502A-44B8-85D5-543239919447@microsoft.com...
> Dean,
>
> The listview is in noway an AdoNet control, while Linq is only AdoNet as
> it is for Linq to AdoNet
>
> Why not use bindable controls as meant for those. The listview is an old
> verhicle basicly for things as windows explorer and more like that. The
> bindable controls where probably not created as it was possible with
> something that is from far in the past millenium.
>
> However if you want to use a control as old as almost a T Ford, than make
> it workable, but that has no purpose for others, who just use DataBindable
> controls as they want to DataBind.
>
> Cor
>
> "Dean Slindee" <slindee@charter.net> schreef in bericht
> news:DE390062-BED1-42EC-9B5D-88E4546A1BB1@microsoft.com...
>> Currently using a legacy Winform listview, that is filled by a function
>> from datatable(0) in a dataset. This works fine as the datatable has
>> column headers and data rows that correspond to listview headers and
>> listview rows.
>>
>> Would like to use Linq to SQL to populate the same legacy WinForm
>> listview. The code below retrieves the IOrderedQuery object correctly:
>> Dim dc As New dcAdminDataContext
>> Dim query = From tblAdminAddressType In
>> dc.tblAdminAddressTypes _
>> Order By tblAdminAddressType.AddressTypeID
>> gvwAdminData.DataSource = query
>>
>> The last statement fills a datagridview thru the .DataSource property.
>> Since, a listview has no .DataSource property, I am at an impasse as to
>> how to convert query to a datatable, or ? I do not want to specify the
>> data column names within each query nor declare a class for the query
>> structure. Any ideas?
>>
>> Thanks in advance,
>> Dean S
>

Dean Slindee

4/8/2008 10:55:00 PM

When I examine the Intellisense, before the query is executed, "query" looks
like a query string. After it is executed, "query" looks like an object
with rows. I was hoping/attempting to cast "query" to a datatable after
executing the "query".

I followed the link, which looked promising with code like:
Dim ds As New DataSet()
FillDataSet(ds)

Dim orders As DataTable = ds.Tables("SalesOrderHeader")
Dim query = _
From order In orders.AsEnumerable() _
Where order.Field(Of DateTime)("OrderDate") > New DateTime(2001, 8, 1) _
Select order

' Create a table from the query.
Dim boundTable As DataTable = query.CopyToDataTable()

As much as the "query" above looks like LINQ syntax, it may not be in the
Linq namespace.
On my statements:
Dim dt As New DataTable
dt = query.CopyToDataTable()
the .CopyToDataTable() gives an Intellisense error message of:
"CopyToDataTable is not a member of 'System.Linq.IQueryable(Of
Admin.tblAdminAddressType)".

This looks like another good example of "close to backward compatibility".
If .CopyToDataTable resided within System.Linq, that might do it.

I would hope to be corrected on this...

"Patrice" <http://www.chez.com/s... wrote in message
news:us19axZmIHA.1208@TK2MSFTNGP03.phx.gbl...
>A LINQ query represents a query. You can't cast a query to a datatable
>exactly as you couldn't cast a SqlCommand object to a DataTable...
>
> Try :
> http://msdn2.microsoft.com/en-us/library/bb3... (CopyToDataTable
> method). It shoudl execute the query and create a datatable from the
> results (never used it but remembered to have seen this).
>
> ---
> Patrice
>
>
>
> "Dean Slindee" <slindee@charter.net> a ?crit dans le message de news:
> 51277F5B-9EEE-4DD7-9CF4-007C567E0232@microsoft.com...
>> Here is the Cast statement I would like to use:
>> Dim dt As DataTable
>> dt = CType(query.Cast(Of tblAdminAddressType)(),
>> System.Data.DataTable)
>>
>> Perhaps my approach is in error, as today it produces this result:
>> Exception Type: System.InvalidCastException
>> Exception Message: Unable to cast object of type
>> 'System.Data.Linq.DataQuery`1[Admin.tblAdminAddressType]' to type
>> 'System.Data.DataTable'.
>>
>>
>> "Cor Ligthert[MVP]" <notmyfirstname@planet.nl> wrote in message
>> news:9E778EF3-502A-44B8-85D5-543239919447@microsoft.com...
>>> Dean,
>>>
>>> The listview is in noway an AdoNet control, while Linq is only AdoNet as
>>> it is for Linq to AdoNet
>>>
>>> Why not use bindable controls as meant for those. The listview is an old
>>> verhicle basicly for things as windows explorer and more like that. The
>>> bindable controls where probably not created as it was possible with
>>> something that is from far in the past millenium.
>>>
>>> However if you want to use a control as old as almost a T Ford, than
>>> make it workable, but that has no purpose for others, who just use
>>> DataBindable controls as they want to DataBind.
>>>
>>> Cor
>>>
>>> "Dean Slindee" <slindee@charter.net> schreef in bericht
>>> news:DE390062-BED1-42EC-9B5D-88E4546A1BB1@microsoft.com...
>>>> Currently using a legacy Winform listview, that is filled by a function
>>>> from datatable(0) in a dataset. This works fine as the datatable has
>>>> column headers and data rows that correspond to listview headers and
>>>> listview rows.
>>>>
>>>> Would like to use Linq to SQL to populate the same legacy WinForm
>>>> listview. The code below retrieves the IOrderedQuery object correctly:
>>>> Dim dc As New dcAdminDataContext
>>>> Dim query = From tblAdminAddressType In
>>>> dc.tblAdminAddressTypes _
>>>> Order By tblAdminAddressType.AddressTypeID
>>>> gvwAdminData.DataSource = query
>>>>
>>>> The last statement fills a datagridview thru the .DataSource property.
>>>> Since, a listview has no .DataSource property, I am at an impasse as to
>>>> how to convert query to a datatable, or ? I do not want to specify the
>>>> data column names within each query nor declare a class for the query
>>>> structure. Any ideas?
>>>>
>>>> Thanks in advance,
>>>> Dean S
>>>
>>
>
>

Dean Slindee

4/10/2008 7:07:00 PM

Looks like we were both working on this one yesterday. I thank you very
much for your effort. See my reply to my original post for a pseudo-MS
solution.
"Cor Ligthert [MVP]" <notmyfirstname@planet.nl> wrote in message
news:ORVZayvmIHA.484@TK2MSFTNGP06.phx.gbl...
> Dean,
>
> Something like this maybe, the rest you may do yourself.
>
> \\> Dim dct As New DataClasses1DataContext
> Dim query = (From wh In dct.MyDataBaseTableName Where wh.CountryCode =
> "NL" Select New With {wh.Code, wh.Description})
> Dim dt As New DataTable
> Dim dc As New DataColumn
> Dim v = query.First
> For Each info In (v.GetType().GetProperties())
> dc = New DataColumn(info.Name)
> dt.Columns.Add(dc)
> Next
> ///
>
>
>

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為雑兵敬服種無し乗用車生き延びるカウンタ

Ziangi Jones

Patrice

Dean Slindee

Dean Slindee

Dean Slindee

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