WPF Datagrid闪烁问题

问题描述 投票:4回答:1

在WPF中,我有一个DataGrid绑定到DataView类的ViewModel。这是一个触摸面板嵌入式项目,因此每当我触摸并滑动面板时,它会不断向我发送值并将这些值保存到DataTable并将其分配给绑定的DataView,其中它只能显示5或10数据更新时的行(预定义)。每当我得到一个新行时,我会删除最后一行,直到总DataTable行数为5/10。

这里的问题是,DataGrid需要比平时更长的时间来绑定最后的值。当我将手从面板上抬起时,我希望网格绑定到这些值,但是用户必须等待它完成此操作需要大约6到10秒。

为此,我在IsAysnc使用了XAML属性。正如预期的那样,这使得DataGrid快速绑定,但每次数据更新时,DataGrid都会闪烁。我怎样才能克服DataGrid中的闪烁问题?或者还有其他方法可以做到这一点。我们遵循MVVM模式进行绑定。提前致谢。

XAML:

     <DataGrid  Grid.Row="1"  HorizontalAlignment="Center" 
VerrticalAlignment="Top" Height="Auto"  Width="Auto" 

        BorderThickness="1" BorderBrush="Black" ColumnHeaderHeight="35" 

RowHeight="30" HorizontalContentAlignment="Center" 

VerticalContentAlignment="Center"AlternationCount="2" 

AlternatingRowBackground="WhiteSmoke"CanUserSortColumns="False"  

CanUserResizeRows="False" HorizontalScrollBarVisibility="Hidden" 

VerticalScrollBarVisibility="Hidden"ItemsSource="{Binding Path = 

View,IsAsync=True,UpdateSourceTrigger=PropertyChanged}" 

Margin="0,20,0,0"AutoGenerateColumns="True"  EnableColumnVirtualization="True" 

EnableRowVirtualization="True" CanUserAddRows="False" >

查看型号:

private void InsertCollection(List<string> values)
        {
            if (values == null || !values.Any()) return;

            try
            {
                var dataRow = ObjectMessageDataTable.NewRow();
                int columnCount = ObjectMessageDataTable.Columns.Count;

                var inputs = values.Select(y => y as object).ToArray();
                for (var i = 0; i < inputs.Count() && i < columnCount; i++)
                    dataRow[i] = values[i];
                ObjectMessageDataTable.Rows.InsertAt(dataRow, 0);
                var count = ObjectMessageDataTable.Rows.Count;

                while (count > NumOfRows)
                {
                    ObjectMessageDataTable.Rows.RemoveAt(NumOfRows);
                    count = ObjectMessageDataTable.Rows.Count;
                }

                ObjectMessageDataTable.AcceptChanges();
                View = ObjectMessageDataTable.DefaultView;
            }
            catch (Exception ex)
            {

            }

        }
wpf xaml mvvm data-binding wpfdatagrid
1个回答
0
投票

我试过你的代码。直接对数据表进行数据绑定非常简单,闪烁就会消失:)。只需使用ObjectMessageDataTable.DefaultView而不是View。因为每次创建View时都会创建View对象本身,这会导致datagrid从头开始初始化。

 ItemsSource="{Binding Path=ObjectMessageDataTable.DefaultView, IsAsync=True, UpdateSourceTrigger=PropertyChanged}"

所以改为

<DataGrid
        Grid.Row="1"
        Width="Auto"
        Height="Auto"
        Margin="0,20,0,0"
        HorizontalAlignment="Center"
        VerticalAlignment="Top"
        HorizontalContentAlignment="Center"
        VerticalContentAlignment="Center"
        AlternatingRowBackground="WhiteSmoke"
        AlternationCount="2"
        AutoGenerateColumns="True"
        BorderBrush="Black"
        BorderThickness="1"
        CanUserAddRows="False"
        CanUserResizeRows="False"
        CanUserSortColumns="False"
        ColumnHeaderHeight="35"
        EnableColumnVirtualization="True"
        EnableRowVirtualization="True"
        HorizontalScrollBarVisibility="Hidden"
        ItemsSource="{Binding Path=ObjectMessageDataTable.DefaultView, IsAsync=True, UpdateSourceTrigger=PropertyChanged}"
        RowHeight="30"
        VerticalScrollBarVisibility="Hidden" />

希望能帮助到你。

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