Unfortunately this doesn't seems to work.

Setting  <Setter Property="Format" Value="###.0000" /> means that even if the value has not fraction part the grid still shows 0s. i.e 684 is now shown as 684.0000 which is not what I want, so for Format property 0.#### is apt as it shows what I need.

The issue is when I enter the edit mode. What I want is if my value is 54.56328745, then while editing I want to show the value as 54.5632 and also allow the user to enter more digits agter the decimal. This would mean the user can see 54.5632 but can change the value to 54.56323265.

Hello Neelesh,
 
Based on the description you have provided that when the double value of your DataItem is 16.15678945, the DisplayText is 16.1567 and the value in edit mode is also 16.1567, I presume you have used the second approach from my previous reply. If this is the case, this behavior is expected since every time the editor enters edit mode, it rounds up the actual value up to four digits after the decimal point.
 
In order to prevent the rounding of the value in edit mode and keep it 16.15678945, I can suggest you try the first approach I have introduced in my previous reply.
 
If you require any further assistance on the matter, please let me know.

Hi,

First approach doesn't seem to work. I am setting these properties in code behind.

Can you help me with some small application?

Hello Neelesh,

I have prepared a sample application where I create a Style for the XamNumericEditor either directly in XAML or in the Click event of a Button by manually setting it to the Field's EditorStyle property.

If the issue is still reproduced or this is not the behavior you were looking for, feel free to modify the sample so the issue is reproduced and send it back to me for further investigation.
 

Hi Tacho,

The problem still remains the same. In the grid (normal mode) the application shows only 4 digits but when I click on a cell and enter the edit mode it show more than that.

My requirement is that in normal mode and in edit mode I need to show 4 digits after decimal, but when I save the value I need entire value entered by the user. 

I have seen this behaviour in UltraGrid.

Hello Neelesh,

By saying "save" I presume you mean updating the DataItem after edit mode has been exited.

Resetting the value of the editor by rounding it up to four digits after the decimal point in code-behind in the EditModeStarting event will instantly visualize the value up to four digits (while in edit mode). Since this has not been done through the UI, the respective Record and it's DataItem will not get updated with that new value and this way you will keep the desired visualization and the actual value.

If the user enters a new value or add digits to the previous one through the UI, the respective Recod and it's DataItem will get updated with the new value and next time the user enters edit mode, the behavior from above will apply.

This way you should be able to visualize up to four digits after the decimal point both in display mode and in edit mode, while the actual value of the Record can be reset as a result of a user interaction only.
I have attached a sample application with this behavior implemented. Inside you will find a button, whose Click event will display the current actual values for all DataItems' Prices from the XamDataGrid's DataSource.

If you require any further assistance on this matter, please let me know.

Hello Neelesh,

An approach I can suggest you in order to display a maximum of four digits after the decimal point when incrementing the value of the cell with "Ctrl + Arrow key" functionality you have introduced is to change the mask of the editor respectively.

Inside the OnKeyUp event, by setting the mask of the XamNumericEditor to "{double:4.4}" prior to setting the Handled property to true, you should be able to achieve the desired behavior:

var cvp = CellValuePresenter.FromCell(dataGrid.ActiveCell);
var editor = Utilities.GetDescendantFromType(cvp, typeof(XamNumericEditor), true) as XamNumericEditor;
editor.Mask = "{double:4.4}";

By handling the EditModeEnded event of the XamDataGrid, you can safely change back the value of the Mask property of the XamNumericEditor:
 
   if (e.Cell.Field.Name == "Price")
{
    var editor = e.Editor as XamNumericEditor;
    editor.Mask = "{double:4.8}";
}
 
While the cell is in edit mode, the operations of entering more than 4 digits after the decimal point and incrementing the value with "Ctrl + Arrow key" will not be working simultaneously because of the difference in the Mask.

I have prepared a sample application, where this behavior has been implemented.
If you require any further assistance on the matter, please let me know.
 

Hi Tacho,

Thanks for the help so far. I have another issue with the digits. Just like in XamDataGrid, the value changes on the arrow key press, I have reciprocated same behavior on Ctrl + Arrow key. All work fine but the issue is that while performing this action the cell shows more than the expected 4 digits. Also if I try to use the logic that was mentioned earlier then while saving I get 4 digits only.

Example:

My Data: 12.236589

Visible during normal or edit mode: 12.2365

Pressing Ctrl + Arrow: 12.236589

Requirement: Show: 12.2365/13.2365/14.2365 but while saving save 14.236589

I have attached sample application too.