壓縮時的WPFDataGrid隨機播放值

問題

WPF 資料網格。一個表三列的資料集。價格、折扣、總計。唯一可編輯的列是折扣。如果我在網格完全可見的情況下輸入資料，則一切正常。

但是如果我縮小視窗并輸入資料，它們就會混淆。它只是弄亂了我在編輯當前單元格結束時看不到的值。似乎是出于惡意！

當我通過放大視窗查看整個網格時的結果是這樣的：

正如你所看到的，總數是混合的！

編碼

我重新創建了一個您可以自己測驗的最小示例。

XAML

<Window x:Class="DataGrid"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TestDatagrid"
        mc:Ignorable="d"
        Title="DataGrid" Height="450" Width="800" Loaded="Window_Loaded">
    <Grid>
        <DataGrid x:Name="grid" Margin="0,28,0,38" 
            CanUserDeleteRows="True" 
            CanUserSortColumns="True" 
            CanUserAddRows="False" 
            SelectionUnit="CellOrRowHeader"
            CellEditEnding="grid_CellEditEnding"/>

    </Grid>
</Window>

VB.NET

Imports System.Data
Imports System.Globalization

Public Class DataGrid


    Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs)
        Dim ds As New DataSet
        Dim tb As New DataTable("Orders")

        Dim price As New DataColumn
        price.ColumnName = "Price"
        price.DataType = System.Type.GetType("System.Decimal")
        tb.Columns.Add(price)

        Dim discount As New DataColumn
        discount.ColumnName = "Discount"
        discount.DataType = System.Type.GetType("System.Decimal")
        tb.Columns.Add(discount)

        Dim total As New DataColumn
        total.ColumnName = "Total"
        total.DataType = System.Type.GetType("System.Decimal")
        tb.Columns.Add(total)

        For i As Integer = 0 To 20
            Dim dr As DataRow = tb.NewRow()
            dr("Price") = CDec((i   1) * 10)
            dr("Discount") = 0
            dr("Total") = CDec((i   1) * 10)
            tb.Rows.Add(dr)
        Next
        ds.Tables.Add(tb)
        grid.ItemsSource = ds.Tables(0).DefaultView

        For Each c In grid.Columns
            If c.Header = "Price" Then c.IsReadOnly = True
            If c.Header = "Total" Then c.IsReadOnly = True
        Next


    End Sub

    Private Sub grid_CellEditEnding(sender As Object, e As DataGridCellEditEndingEventArgs)
        If e.EditAction = DataGridEditAction.Commit Then

            Dim nfi As NumberFormatInfo = New NumberFormatInfo()
            nfi.NumberDecimalSeparator = "."

            Try

                Dim tPrice As TextBlock = TryCast(grid.Columns(0).GetCellContent(e.Row), TextBlock)
                Dim Price As Double = CDbl("0" & Replace(tPrice.Text, ".", ","))

                Dim Discount As Double = CDbl("0" & Replace(TryCast(e.EditingElement, TextBox).Text, ".", ","))
                Dim Total As Double = Price * (1 - (Discount / 100))

                ' Format the discount value
                e.EditingElement.SetValue(TextBox.TextProperty, String.Format(nfi, "{0:0.00#}", Discount))

                ' Format and show the value on datagrid
                TryCast(grid.Columns(2).GetCellContent(e.Row), TextBlock).Text = String.Format(nfi, "{0:0.00#}", Total)

                ' Update the value on grid
                TryCast(grid.CurrentItem, DataRowView).Item(2) = Total


            Catch ex As Exception

            End Try


        End If
    End Sub

End Class

我真的不知道發生了什么！

感謝您給我的任何提示或幫助。

uj5u.com熱心網友回復：

我真的不知道發生了什么！

虛擬化，即出于性能原因，您錯誤編輯的元素會被重新使用。

顯而易見且推薦的解決方案是避免直接編輯視覺元素，而是編輯底層的列DataRowView。

另一種解決方案是禁用虛擬化：

<DataGrid VirtualizingPanel.IsVirtualizing="False" EnableRowVirtualization="False" ... />

標籤：wpf VB.net 数据网格

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