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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.
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.
Next, you'll need to add a Data Grid View to a form. ' create new style object Dim style As New Data Grid View Cell Style ' set the alignment to the right (for numbers) style. Middle Right ' add a wee bit of padding to the right side Dim p As New Windows. This allows you to use a "business rule" to validate the user input.
From inside the Form Designer, you should see a very small triangle at the upper right-hand corner of the Data Grid View control. For example, if the Units On Hand column can never be a negative number,you could write a validating rule that looks to see if the value is negative prior to committing the changes to that row.
The Data Grid View is a very powerful windows form control for providing a user interface to tabular data.
Data Property Name = "Category ID" ' the matching column from the "base" table dgvc.The remaining overrides are to adjust to the fact that the Masked Text Box control supports multiple "validating types". Editing Control Formatted Value Get Return Me.value Is Changed. End Sub Public Read Only Property Reposition Editing Control On Value Change() As Boolean _ Implements IData Grid View Editing Control.Public Class Data Grid View Masked Edit Cell Inherits Data Grid View Text Box Cell Dim p Column As Data Grid View Masked Edit Column Public Sub New() End Sub Public Overrides Sub Initialize Editing Control(By Val row Index As Integer, By Val _ initial Formatted Value As Object, By Val data Grid View Cell Style As Data Grid View Cell Style) My Base. To String End Get Set(By Val value As Object) If Type Of value Is [String] Then Me. To String End If End Set End Property Public Function Get Editing Control Formatted Value(By Val context As _ Data Grid View Data Error Contexts) As Object Implements _ IData Grid View Editing Control. Text End Function Public Sub Apply Cell Style To Editing Control(By Val data Grid View Cell Style As _ Data Grid View Cell Style) Implements _ IData Grid View Editing Control. Reposition Editing Control On Value Change Get Return False End Get End Property Public Property Editing Control Data Grid View() As Data Grid View Implements _ IData Grid View Editing Control. Click on this triangle to select the data source that was created for you when you ran the Data Source Conversion Wizard. You can use the Error Provider class to display the problems detected during validation.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.