Does DataGridView always depend on public properties for column values?
At runtime, I have a collection of rows (Row
class). Each of them consist of column values, represented by instances of a ColumnValue
class. The name of the columns are determined at runtime, and are in a separate columns descriptor collection (Column
class开发者_如何学编程).
I want to create a DataGridView
that displays all Row
instances. Of course, the DataGridView
's columns shall be exactly those specified by the Column
instances in the containing collection.
But since DataGridView
's columns can fetch their values from a list item's public properties only, and I cannot easily define such a property at runtime, I cannot use DataGridView
to display the tabular data.
Correct?
Consider these VB classes for example:
' Classes for table structure representation
Public Class TColumn ' describes my columns
Public Name As String
Public Index As Integer
Public Sub New(ByVal AName As String)
Name = AName
End Sub
End Class
Public Class TTable ' describes a table
Public Name As String
Public Columns As Collection
Public Sub New(ByVal AName As String)
Name = AName
Columns = New Collection
End Sub
End Class
' Classes for table data
Public Class TRow ' Container for one row's column values
Public ColumnValues As Collection
Public Sub New()
MyBase.New()
ColumnValues = New Collection()
End Sub
End Class
Public Class TTableData ' Container for a table's rows
Public Table As TTable
Public Rows As Collection
Public Sub New(ByVal ATable As TTable)
MyBase.New()
Table = ATable
Rows = New Collection()
End Sub
End Class
And this main form code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim T As TTable
Dim TD As TTableData
Dim CV As Collection
T = New TTable("Sample")
T.Columns.Add(New TColumn("Column1"))
T.Columns.Add(New TColumn("Column2"))
TD = New TTableData(T)
CV = New Collection
CV.Add("Row1Col1")
CV.Add("Row1Col2")
TD.Rows.Add(CV)
CV = New Collection
CV.Add("Row2Col1")
CV.Add("Row2Col2")
TD.Rows.Add(CV)
' Question: How can I create a DataGridView that displays this:
'
' Column1 Column2
' Row1Col1 Row1Col2
' Row2Col1 Row2Col1
'
' WHILE the Columns collection contents are dynamic, i.e. determined at runtime, not at compile- or design-time?
End Sub
End Class
I wonder what DataGridViewColumn.DataPropertyName
value I would specify for example when defining (at runtime) Column1
's DataGridView
column???
Generally asking: Is it true that DataGridView
always wants to fetch the data from object instances with public properties, and those define the column structure and especially values? I cannot display stuff that does not have public properties at all?
You should override the CellFormatting
event of DataGridView
and set e.Value
to table(e.RowIndex)(e.ColumnIndex)
.
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