Nope failed with DataGridView...moved to UltraGrid...failed on that as well....tried to create a relationship back to itself on the table, so that the object would appear as a column in itself.....failed in the Model designer.
> -----Original Message----- > From: Discussion of advanced .NET topics. [mailto:ADVANCED- > [EMAIL PROTECTED] On Behalf Of Nicholls, Mark > Sent: 05 September 2008 15:34 > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > Subject: Re: [ADVANCED-DOTNET] DataGridViewComboBoxColumn and entity > framework.... > > Thanks very much for that....I try to use the standard control when > possible but the datagrid thing is a complete pain at times...and gives > little clue of what the real problem is...inner exception is always > blank. > > I managed previously to get this working with Linq2SQL....with much > wrestling it eventually did something sensible....so I just naively > tried to implement the same approach, but as you say it doesn't map the > key fields in the same way. > > Leaving the valuemember blank seems to work for normal listboxes, but > for some reason I can't seem to get it going in the grid. > > I'll have a mess about for 5 mins, give up and try an infragistics grid. > > > -----Original Message----- > > From: Discussion of advanced .NET topics. [mailto:ADVANCED- > > [EMAIL PROTECTED] On Behalf Of Frans Bouma > > Sent: 05 September 2008 14:54 > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > Subject: Re: [ADVANCED-DOTNET] DataGridViewComboBoxColumn and entity > > framework.... > > > > > In fact saying that I can't (out of the box) get a > DataGridViewTextCell > > > to work correctly either, it displays the class name...i.e. the > default > > > ToString()....and there is no option to set which property to > display. > > > > I think your prob is caused by the fact that the EF doesn't > have > > the > > concept of a foreign key field in an entity. > > > > So say we bind northwind Orders to a datagridview and want to > pick > > the > > employees by a combobox in the employee column, you should have a > column > > of > > the 'Employee' present in the grid, and the combobox column should > have > > its > > valuemember left empty. At least that's how it works with 3rd party > grids. > > > > Similar to "Complex databinding example" (selfservicing / > adapter) > > available here: > > http://www.llblgen.com/pages/examples.aspx > > > > Not for the entity framework, but it shows how it's done. When > I > > hack > > around in that example to make it work like you would with the EF, I > too > > run > > into something which I think is a limitation of the datagridview > > combobox...: > > when I add another column which is bound to Order.Employee (the object > > property/navigator) and leave valuemember empty, and at runtime select > a > > value > > from the combobox, I get a silly text conversion error thrown by the > grid > > saying that it can't convert a string (the selectedvalue in the > combobox) > > to > > an employee object... Duh... THough it should pick the selectedITEM... > :/ > > > > devexpress' grid does this properly though. Not sure if you > have > > that > > one available to you. > > > > So if you pick a real grid, perhaps it works then. > > > > FB > > > > > > > > Irratatingly I can't find any entity frameworks samples that I can > > > download...even when I follow the link on the MS web site, the > sample > > > code does not exist where they claim it does. > > > > > > > > > > -----Original Message----- > > > > From: Discussion of advanced .NET topics. [mailto:ADVANCED- > > > > [EMAIL PROTECTED] On Behalf Of Nicholls, Mark > > > > Sent: 05 September 2008 13:26 > > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > > Subject: [ADVANCED-DOTNET] DataGridViewComboBoxColumn and entity > > > > framework.... > > > > > > > > Has anyone got this to work? > > > > > > > > DataGridView are unpleasant things that don't tell you what the > > > problem > > > > is... > > > > > > > > I've used the Microsoft Course Sample, and ammended the Department > > > field > > > > to be a DataGridViewComboBoxColumn... > > > > > > > > bind it to a Department binding source. > > > > > > > > I'm then given a Display member...which is fine...Name. > > > > > > > > Then the value member.....ahhh....Department doesn't seem to be in > the > > > > list....and if I use DepartmentID it gets upset....probably quite > > > > sensibly. > > > > > > > > Any ideas....? > > > > > > > > =================================== > > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > > > View archives and manage your subscription(s) at > > > > http://discuss.develop.com > > > > > > > > > > > > CONFIDENTIALITY NOTICE > > > > > > This e-mail (and any attached files) is confidential and protected > by > > > copyright (and other intellectual property rights). 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