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Posted by / 27-Feb-2020 13:12

Rowvalidating example

The example below shows how you could replace an existing automatically-generated "Units In Stock" column with a new custom column that supports the Masked Edit feature. Columns("Units In Stock")) ' remove the existing column Data Grid View1. Remove At(index) ' create a new custom column Dim dgv Masked Edit As New Data Grid View Masked Edit Column dgv Masked Edit.

Dim index As Integer ' find the location of the column index = Data Grid View1. Mask = "####" ' this mask will allow only numbers (max of 4) dgv Masked Edit.

You can bind a Data Table to the control so the user can easily add/delete/modify data in a database. Products) End Sub By default, the automatically generated columns may need some tweaking.

Let's say that you have a Microsoft Access database that you plan to use in your program. For example, all columns are aligned to the left and have have no formatting.

From Visual Studio, all you'd have to do is add the MDB file to the project and it will automatically launch the Data Source Conversion Wizard. You can perform most of these tweaks by either using the designer or via code. Padding = p ' set the monetary string format style.

At the conclusion of this wizard, you'll have a strongly-typed dataset, a Table Adapter, and Data Table added to your project. Products) End Sub ' ' Save the changes you've made via the Data Grid View back to the ' underlying database ' Private Sub bn Update_Click(By Val sender As System. Let's look at how you could perform some simple tweaks in a column that contains a Money field. Format = "$#.00" ' apply the style to the column Data Grid View1. Default Cell Style = style The major technique for detected errors in a Data Grid View is by the Row Validating event.

Value Member = "Category ID" ' the numeric value to look up in the "child" table dgvc.

Display Member = "Category Name" ' the column value you want displayed dgvc. Get Data() ' the child table ' some more tweaking dgvc. Automatic ' insert the new column at the same location Data Grid View1. Insert(index, dgvc)) Now the user can select the user-friendly Category strings and also is prevented from selecting a value that's not a valid Category ID If the 5 built-in column types is not sufficient, it is fairly easy to add a custom column type yourself.

Afterwards, you should have a fully-functional program that will allow you to view the data in the Data Table. When an input error occurs, there will be a little red exclamation point at that cell location.

New(New Data Grid View Masked Edit Cell()) End Sub Public Overrides Property Cell Template() As Data Grid View Cell Get Return My Base. Return Get Type(Masked Edit Editing Control) End Get End Property Public Overrides Read Only Property Value Type() As Type Get ' Return the type of the value that Masked Edit Editing Control contains. Validating Type End Get End Property Public Overrides Read Only Property Default New Row Value() As Object Get Return "" End Get End Property End Class Lastly, is the Editing Control. Back Color End Sub Public Property Editing Control Row Index() As Integer Implements _ IData Grid View Editing Control.

Cell Template End Get Set(By Val value As Data Grid View Cell) ' Ensure that the cell used for the template is a Masked Edit Cell If Not (value Is Nothing) And Not value. Is Assignable From( _ Get Type(Data Grid View Masked Edit Cell)) Then Throw New Invalid Cast Exception("Must be a Data Grid View Masked Edit Cell") End If My Base. It inherits from the Masked Text Box control (to get the user interface we want) and implements the Editing Control interface so that the control works inside the Data Grid View. Editing Control Row Index Get Return row Index Num End Get Set(By Val value As Integer) row Index Num = value End Set End Property Public Function Editing Control Wants Input Key(By Val key As Keys, By Val _ data Grid View Wants Input Key As Boolean) As Boolean Implements _ IData Grid View Editing Control.

Validating Type = Get Type(Integer) dgv Masked Edit. Data Property Name = "Units In Stock" ' some more tweaking dgv Masked Edit. Automatic ' insert the new column at the same location Data Grid View1. Insert(index, dgv Masked Edit) Now the user will only be able to type numbers into this column.

This technique provides an enhancement to the Data Grid View control that further affirms the notion that you should always attempt to prevent user input errors rather than just detect them.

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For example, you could create a new column type that supports the Masked Edit feature found in the Masked Text Box control.

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