DataGrids and BindingContext

[John Celmer]

Can someone please help me with my code. I have a datasetX with two tables,
tableA and tableB in the datasetX. The tables have a DataRelation named
A_B_Relation. How can I get the BindingManagerB ase to be a Currency Manager
so that I can get the current position when there is movement in dataGrid1.
This is my code:

// set up the binding contexts for Master/Detail grids
dataGrid1->DataSource = datasetX;
dataGrid1->DataMember = S"tableA";
dataGrid2->DataSource = datasetX;
dataGrid2->DataMember = S"A_B_Relation" ;
....
....
// get the current position
BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX,
S"tableA"];
DataRowView* view = __try_cast<Data RowView*>(manag er->Current); // this
line fails with a Bad Cast exception

The above code produces a BindingManagerB ase of type PropertyManager , not a
Currency Manager. How can I get a CurrencyManager that will cast to a
DataRowView of the current position? Please help.

[Marcus Heege]

RE: DataGrids and BindingContext

Haven't tried it, but since your data source is datasetX, you should use

BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX];

instesad of

BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX, "tableA"];

HTH
Marcus Heege


"John Celmer" wrote:
[color=blue]
> Can someone please help me with my code. I have a datasetX with two tables,
> tableA and tableB in the datasetX. The tables have a DataRelation named
> A_B_Relation. How can I get the BindingManagerB ase to be a Currency Manager
> so that I can get the current position when there is movement in dataGrid1.
> This is my code:
>
> // set up the binding contexts for Master/Detail grids
> dataGrid1->DataSource = datasetX;
> dataGrid1->DataMember = S"tableA";
> dataGrid2->DataSource = datasetX;
> dataGrid2->DataMember = S"A_B_Relation" ;
> ....
> ....
> // get the current position
> BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX,
> S"tableA"];
> DataRowView* view = __try_cast<Data RowView*>(manag er->Current); // this
> line fails with a Bad Cast exception
>
> The above code produces a BindingManagerB ase of type PropertyManager , not a
> Currency Manager. How can I get a CurrencyManager that will cast to a
> DataRowView of the current position? Please help.
>
>
>
>[/color]

[John Celmer]

Re: DataGrids and BindingContext

Thanks. Your advice led to a resolution. And as I also later needed a
DataRowView, I changed my source from a dataset to a dataview. Thanks
again.

"Marcus Heege" <Marcus Heege@discussio ns.microsoft.co m> wrote in message
news:3061C333-B48A-46CD-B46A-F6EB6E4F0498@mi crosoft.com...[color=blue]
> Haven't tried it, but since your data source is datasetX, you should use
>
> BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX];
>
> instesad of
>
> BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX,
> "tableA"];
>
> HTH
> Marcus Heege
>
>
> "John Celmer" wrote:
>[color=green]
>> Can someone please help me with my code. I have a datasetX with two
>> tables,
>> tableA and tableB in the datasetX. The tables have a DataRelation named
>> A_B_Relation. How can I get the BindingManagerB ase to be a Currency
>> Manager
>> so that I can get the current position when there is movement in
>> dataGrid1.
>> This is my code:
>>
>> // set up the binding contexts for Master/Detail grids
>> dataGrid1->DataSource = datasetX;
>> dataGrid1->DataMember = S"tableA";
>> dataGrid2->DataSource = datasetX;
>> dataGrid2->DataMember = S"A_B_Relation" ;
>> ....
>> ....
>> // get the current position
>> BindingManagerB ase* manager = Form1::BindingC ontext->Item[datasetX,
>> S"tableA"];
>> DataRowView* view = __try_cast<Data RowView*>(manag er->Current); // this
>> line fails with a Bad Cast exception
>>
>> The above code produces a BindingManagerB ase of type PropertyManager , not
>> a
>> Currency Manager. How can I get a CurrencyManager that will cast to a
>> DataRowView of the current position? Please help.
>>
>>
>>
>>[/color][/color]