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如何将数据网格中绑定列中显示的文本格式化为函数的输出？

假设我的代码隐藏中有这样的功能：

Function Test(ByVal str As String) As String
    Return Left(str, 5)
End Function

和一个像这样的数据网格：

    <DataGrid Name="dg_Users" IsReadOnly="True" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="User ID" Binding="{Binding UserID}" />
            <DataGridTextColumn Header="Username" Binding="{Binding Username}" />
        </DataGrid.Columns>
    </DataGrid>

绑定到 StronglyTyped IList。（这只是一个循环添加到强类型列表的 SqlCeDataReader 对象）：

Private Shared Function Map(Of T As New)(ByVal _Rdr As IDataReader) As IList(Of T)
    Try
        Dim _t As Type = GetType(T)
        Dim _en As New List(Of T)()
        Dim _ht As New Hashtable()
        Dim _props As PropertyInfo() = _t.GetProperties()
        Parallel.ForEach(_props, Sub(info)
                                     _ht(info.Name.ToUpper()) = info
                                 End Sub)
        While _Rdr.Read()
            Dim newObject As New T()
            For index As Integer = 0 To _Rdr.FieldCount - 1
                Dim info As PropertyInfo = DirectCast(_ht(_Rdr.GetName(index).ToUpper()), PropertyInfo)
                If (info IsNot Nothing) AndAlso info.CanWrite Then
                    info.SetValue(newObject, IsNull(Of Object)(_Rdr.GetValue(index), Nothing), Nothing)
                End If
            Next
            _en.Add(newObject)
        End While
        _Rdr.Close()
        Return _en
        _ht.Clear() : _en.Clear()
    Catch ex As Exception
        Return Nothing
    End Try
End Function

如何Username使用上述功能格式化列Test？

4

1 回答 1

2

使其成为类型（我猜是用户）的只读属性（只有 getter）并绑定到它。让它变得容易得多。

于 2013-08-22T17:08:07.190 回答