Question

当我更改数据网格中列的顺序时，会保存这些设置，但在初始化程序时它们不会显示。为了显示保存的设置，我必须先从下拉框中选择另一个项目，然后返回。然后保存的订单显示出来。如何在初始化时显示列？

Answer 1

进行更改后绑定数据网格吗？在asp.net中，至少你必须在修改gridview / datagrid后重新绑定以查看结果。

Answer 2

我不确定是否提出了你的问题，但如果问题是数据的sturtup顺序，你可以在绑定之前订购datagrid的source-collection（例如使用LINQ）。对不起VB，但我认为你可以很容易地做到：

这是一个“紧凑”的例子：

Public Sub New()
    ' initialize the collection
    _MyTypeItemList = From a In MyTypeItemList Select a Order By a.MyProperty2
End Sub

这是一个更完整的例子。如果这不是你需要的，请耐心等待，我是意大利人，我不是大师，我的英语也是如此：

Imports System.Collections.ObjectModel
Imports System.ComponentModel

Public Class MyType
    Public Sub New()
        ' initialize the collection
        _MyTypeItemList = From a In MyTypeItemList Select a Order By a.MyProperty2
    End Sub

    Private _MyTypeItemList As New ObservableCollection(Of MyTypeItem)

    Public ReadOnly Property MyTypeItemList() As ObservableCollection(Of MyTypeItem)
        Get
            MyTypeItemList = _MyTypeItemList
        End Get
    End Property
End Class

Public Class MyTypeItem
    Implements INotifyPropertyChanged

    Public Sub New(ByVal MyProperty1Pass As Long, ByVal MyProperty2Pass As Date)
        _MyProperty1 = MyProperty1Pass
        _MyProperty2 = MyProperty2Pass
    End Sub

    Private _MyProperty1 As Long = Nothing
    Private _MyProperty2 As Date = Nothing

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

    Public Property MyProperty1() As Long
        Get
            MyProperty1 = Me._MyProperty1
        End Get

        Set(ByVal value As Long)
            If Not Object.Equals(Me._MyProperty1, value) Then
                Me._MyProperty1 = value
                Me.OnPropertyChanged("MyProperty1")
            End If
        End Set
    End Property

    Public Property MyProperty2() As Date
        Get
            Return Me._MyProperty2
        End Get

        Set(ByVal value As Date)
            If Not Object.Equals(Me._MyProperty2, value) Then
                Me._MyProperty2 = value
                Me.OnPropertyChanged("MyProperty2")
            End If
        End Set
    End Property

    Protected Overridable Sub OnPropertyChanged(ByVal propertyName As String)
        Dim handler As PropertyChangedEventHandler = Me.PropertyChangedEvent
        If handler IsNot Nothing Then
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
        End If
    End Sub
End Class

有关在数据网格中保存列标题的问题！

2 个答案: