如何合并2个数据属性并将其显示在DataGridView的单个列中？

Question

I want to merge and display 2 data fields in 1 column in the DataGridView . How is this possible in vb.net?

The DataGridView has a DataSource.

Answer 1

You can use either of these options:

• Creating a computed Column for DataTable
• Creating a read-only Property for Class
• Handling CellFormatting event of DataGridView

Creating a computed Column for DataTable

If data fields belongs to a DataTable you can add a computed DataColumn to your DataTable and set its Expression property to return desired value based on those two columns.

table.Columns.Add("DisplayName", GetType(String), "FirstName + ' ' + LastName")

Creating a read-only Property for Class

If data fields belongs to a plain model class you can add a read only property which in the getter, return desired value based on those 2 properties.

Public Class Person
    Public Property FirstName As String
    Public Property LastName As String
    Public ReadOnly Property DisplayName As String
        Get
            Return String.Format("{0} {1}", FirstName, LastName)
        End Get
    End Property
End Class

Using CellFormatting event of DataGridView

As a general solution for all cases, you can use CellFormatting event of DataGridView and set e.Value to desired value based on those two fields.

Private Sub DataGridView1_CellFormatting(sender As Object,  _
    e As DataGridViewCellFormattingEventArgs Handles DataGridView1.CellFormatting
    ' For example you want to do it for 3rd column
    If e.ColumnIndex = 2 AndAlso e.RowIndex >= 0 Then   
        Dim row = Me.DataGridView1.Rows(e.RowIndex)
        'If DataSource is a DataTable, DataBoundItem is DataRowView
        Dim data = DirectCast(row.DataBoundItem, Person)
        e.Value = String.Format("{0} {1}", data.FirstName, data.LastName)
    End If
End Sub