Vb.net vb无法强制转换用户类型
我有两个新班级Vb.net vb无法强制转换用户类型,vb.net,Vb.net,我有两个新班级 Public Class ColCust Inherits DataGridViewColumn Dim clsCellText As New CellCust Public Sub New() Me.CellTemplate = clsCellText End Sub End Class Public Class CellCust Inherits DataGridViewTextBoxCell End Class
Public Class ColCust
Inherits DataGridViewColumn
Dim clsCellText As New CellCust
Public Sub New()
Me.CellTemplate = clsCellText
End Sub
End Class
Public Class CellCust
Inherits DataGridViewTextBoxCell
End Class
在主窗体上,我有一个网格,我尝试使用新类
With dg6
.Columns.Clear()
.Rows.Clear()
For iCol As Integer = 0 To 4
Dim col As New ColCust
.Columns.Add(col)
Next
.Rows.Add(New String() {"1"})
.Rows.Add(New String() {"2"})
.Rows.Add(New String() {"3"})
.Rows.Add(New String() {"4"})
Me.Controls.Add(dg6)
End With
到现在为止一切正常,
但这里我得到了错误
无法强制转换类型为的对象
要键入的“System.Windows.Forms.DataGridViewTextBoxColumn”
“Test.ColCust”
怎么了
Dim colText As DataGridViewTextBoxColumn
colText = dg6.Columns(0)
您是否尝试过DirectCastdg6.Columns0,Test.ColCust?ColCust继承自DataGridViewColumn,而不是DataGridViewTextBoxColumn。谢谢,是的,我尝试过DirectCast&CType nothing正在工作。ColCust继承自DataGridViewColumn对不起,您说得对,应该是这样的