Datagridview cell value not updating


10-Jun-2015 02:52

You might expect this information to be readily available in the form of events, after all, the Windows Forms Data Grid View has Cell Clicked and Column Header Mouse Click events (among many others). In order to implement this behaviour you have to understand the visual tree of the Data Grid and how it can be navigated.

Let's say for example you wanted to find the Data Grid item (cell, row, header) that was clicked when the right mouse button is released.

I want to refactor this code that is currently in a partial Form Class and deals with edits made on certain cells in a datagridview (in this case called dgv Replenish). Row Index); } private void dgv Replenish_Cell Formatting(object sender, Data Grid View Cell Formatting Event Args e) { Change Color Of Warehouse Shop Name(e); } private void dgv Replenish_Cell Value Changed(object sender, Data Grid View Cell Event Args e) { if (e. Cell Validating += new Data Grid View Cell Validating Event Handler(dgv Replenish_Cell Validating); dgv Replenish.

I would like to refactor so that I can create unit tests to be able to test the logic that effects changing the back color of cells, and updating other cells. Cell Value Changed -= new Data Grid View Cell Event Handler(dgv Replenish_Cell Value Changed); dgv Replenish.

The WPF Data Grid is a very flexible tool, however in its current state certain simple tasks can prove to be rather tricky.

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The WPF rich-content model means that our cells could contain all sorts of visual element, therefore we have no way of guessing exactly what e. However, the one thing of which we can be certain is that this element is a child of the element which we are interested in. In the Items Control terminology, the Data Grid Row is an Item Container and the Data Grid has an Item Container Generator associated with it for generating the rows. The following method determines the property binding for the cells column, then extracts the value from the data items associated with the row: Putting it all together, this blog post has a small smaple application which displays the header index and value, or cell's row/column indices and value in response to a right mouse click: The sample project can be download, wpfdatagridmouseclicks, changing the file extension from to I am Technology Director at Scott Logic and am a prolific technical author, blogger and speaker on a range of technologies.If you place a bearkpoint within yoru event handler, you can then use the excellent Mole debug visualiser to locate the clicked element within the visual tree as illustrated below: As you can see, the visual tree is a complex beast! I don't want to go into the details of how Item Containers work, Dr. For a number of years I worked with the Microsoft stack of technologies, including WPF, WCF, Silverlight and Windows Phone.The problem I am having is how to refactor logic to an external class, that has references to the winform controls. Cell Value Changed += new Data Grid View Cell Event Handler(dgv Replenish_Cell Value Changed); dgv Replenish.Form All following code is part of private string last Edited Cell Value; private void dgv Replenish_Cell Begin Edit(object sender, Data Grid View Cell Cancel Event Args e) { last Edited Cell Value = dgv Replenish. Cell Formatting -= new Data Grid View Cell Formatting Event Handler(dgv Replenish_Cell Formatting); dgv Replenish.

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Firstly, we add an event handler for the mouse click in our code-behind: XAML: The above event is a 'bubbling' event, which means that it it started on the element that was originally clicked (for example a Text Block which renders the cell's value within a Data Grid Cell), then bubbled up the logical tree until it reaches our event handler in the Window. Original Source property gives us access to the element that initiated this event.The problem is that while we have access to the lement which was clicked on, this element is part of the control or data template of the element that we are really interested, the cell or header. Once we have navigated up the tree to the Data Grid Cell, we can continue our journey upwards to obtain the Data Grid Row: Does the Data Grid Row have a Row Index property? The Data Grid is an Items Control - WPF users are probably most familiar with the List View which is also an Items Control whcih has a number of similarities with the Data Grid.



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