问题描述
我想在devexpress中创建一个checkedlistbox并绑定数据。
启用特定项但生成错误。就像对象引用未设置为对象的实例一样。
我尝试过：
Dim control As CheckedListBoxControl = TryCast（发送者， CheckedListBoxControl）
Dim isActive As Boolean = CBool（（TryCast（（TryCast（control.DataSource，BindingSource））（e.Index），DataRowView））（Is_Active ））
如果isActive然后
e.Enabled = False
结束如果
I want to make a checkedlistbox in devexpress and bind the data.
when Enable the specific items but generate the error .like as Object reference not set to an instance of an object.
What I have tried:
Dim control As CheckedListBoxControl = TryCast(sender, CheckedListBoxControl)
Dim isActive As Boolean = CBool((TryCast((TryCast(control.DataSource, BindingSource))(e.Index), DataRowView))("Is_Active"))
If isActive Then
e.Enabled = False
End If
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