How do I bind a property in a Field/FieldSetting/Field Layout to a record

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Graeme posted over 16 years ago

I'm sure this is a stupid question I can't see how to do this. For example if I wanted to set the AllowEdit FieldSetting to true or false depending on a record value. From a cell you would just use "Record.DataItem", but this is not available from a field.

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Offline Joe Modica posted over 16 years ago

Hi -

One way to prevent editing of a cell based on the cell's value is to handle the xamDataGrid's EditModeStarting event. The event arguments include a reference to the cell and you can use this to check the value and set the Cancel eventargs parameter to true to prevent editing.

Joe Modica
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Offline Graeme posted over 16 years ago in reply to Joe Modica

Thanks Joe. I think you solved my problem.

In a more general sense, how would one bind a record to a field (field/setting/layout) in XAML. This I am asking partly as a learning and understanding thing. I am really stuggling to get my head around XAM, and even more so, Xam Datagrid. It seems incredibly powerful. I can envisage doing so many things with the datagrid I would never have been able to do. But I want to get to that point where i feel familair with it and I can understand it's internal structure. For instance laying out a field and altering it's settings and behaviour based on values within the record itself would seem to be an important and standard feature. So I'm sure there is a way to easily do this binding, but I have not n smart enough to realise it.

Thanks,

Graeme
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Offline Joe Modica posted over 16 years ago in reply to Graeme

Hi Graeme -

There is no direct relationship between a record and a field - a record (DataRecord to be specific) contains a collection of cells representing the data contained in each 'column' of the data for the current instance of the DataRecord. A Field is a column definition - i.e., it describes general characteristics and information about a specific column in the data (e.g., DataType). One or more Fields (corresponding to each 'column' in your data) are contained in a FieldLayout which describes the 'shape' of each record in your data.

So a FieldLayout contains Field definitions and one FieldLayout supports 'n' DataRecord instances which each contain a collection of Cells. If your looking for a relationship between FieldLayout/Field on the one hand and DataRecord/Cell on the other, FieldLayout defines the characteristics of Records and Field defines characteristics of Cells.

So you would never bind a Record to a Field.

I hope this helps.

Joe Modica
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339

Jamie posted over 16 years ago in reply to Joe Modica

For anybody who's interested, this is how I solved the field-record relationship issue. Not ideal but does the job!

private void x_InitializeRecord(object sender, Infragistics.Windows.DataPresenter.Events.InitializeRecordEventArgs e) {
            if (e.Record is DataRecord) {
                DataRecord dr = e.Record as DataRecord;
                foreach (Cell c in dr.Cells) {
                    c.Field.Tag = dr;
                }
            }
        }

Any better solutions, I would love to know.
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