VS.NET Add-in在Design time获取控件值
客户要写一个Visual Studio .NET的Add-in,需要在design time获取form上控件的值,以下是用Reflection的做法
Dim win As Window = applicationObject.ActiveWindow
Dim d As ComponentModel.Design.IDesignerHost = win.Object
iss = d.GetService(GetType(ComponentModel.Design.ISelectionService))
Dim c As ComponentModel.Component = iss.PrimarySelection
Dim pi As Reflection.PropertyInfo = CObj(c).GetType().GetProperty("Visible")
Dim val As Object = pi.GetValue(c, Nothing)
Dim tc As System.ComponentModel.TypeConverter = ComponentModel.TypeDescriptor.GetConverter(val)
MsgBox(c.Site.Name & "." & pi.Name & " = " & tc.ConvertToString(val))
Dim d As ComponentModel.Design.IDesignerHost = win.Object
iss = d.GetService(GetType(ComponentModel.Design.ISelectionService))
Dim c As ComponentModel.Component = iss.PrimarySelection
Dim pi As Reflection.PropertyInfo = CObj(c).GetType().GetProperty("Visible")
Dim val As Object = pi.GetValue(c, Nothing)
Dim tc As System.ComponentModel.TypeConverter = ComponentModel.TypeDescriptor.GetConverter(val)
MsgBox(c.Site.Name & "." & pi.Name & " = " & tc.ConvertToString(val))
这样做有一个问题,当我要取TextBox.Visible这类属性的时候,返回值永远为true,因为reflect的是designer中的textbox对象,它的visible值永远为true。正确的做法是通过PropertyDescriptorCollection来读取Properties window里面的值,代码如下:
'query Properties
Dim properties As System.ComponentModel.PropertyDescriptorCollection
properties = System.ComponentModel.TypeDescriptor.GetProperties(c)
Dim prop As System.ComponentModel.PropertyDescriptor
prop = properties("Visible")
MsgBox(c.Site.Name & "." & prop.Name & " = " & prop.GetValue(c))
本贴子以“现状”提供且没有任何担保,同时也没有授予任何权利