WPF DataGrid 服務端排序

時間 2019-12-02

標籤 wpf datagrid 服務排序简体版

原文原文鏈接

轉載：http://www.kecq.com/artic-10322303.htmlhtml

之前作了一個數據客戶端，不過是直接連數據庫的，如今認爲這種方式不太好，因而改爲服務端RESTful API+客戶端，數據處理都在服務端。在編寫過程當中遇到一些問題，由於以前沒有采用分頁，因此排序就用DataGrid默認的就行，可是如今須要在服務端分頁了，就發現了一些問題，記錄下來。數據庫

在XAML中有一個名爲dataGrid1的DataGrid，點擊列頭排序只須要在上面加上Sorting屬性後端

<DataGrid Grid.Row="2" x:Name="dataGrid1" AutoGenerateColumns="False" IsReadOnly="True" AlternationCount="2" Sorting="dataGrid1_Sorting" >ui

初始化的時候能夠爲某一列指定排序spa

 ICollectionView view = CollectionViewSource.GetDefaultView(list);
 view.SortDescriptions.Clear();  //先清除全部的排序
 SortDescription sd = new SortDescription("列名",  ListSortDirection.Descending);
 view.SortDescriptions.Add(sd);

也能夠在XAML中指定，假設列名是movieNamecode

<DataGrid.Columns>orm

<DataGridTextColumn Binding="{Binding Path=movieName}" SortDirection="Ascending" SortMemberPath="movieName" Header="名稱" />htm

</DataGrid.Columns>blog

下面來看主要排序方法排序

private void dataGrid1_Sorting(object sender, DataGridSortingEventArgs e)
        {
            e.Handled = true;    //可要可不要  沒去仔細研究
            pager.OrderColumn = e.Column.SortMemberPath;
            ICollectionView view = CollectionViewSource.GetDefaultView(dataGrid1.ItemsSource);
 
            pager.Order = "asc";  //默認升序
            if (view.SortDescriptions.Count>0)
            {
                if(view.SortDescriptions[0].PropertyName== e.Column.SortMemberPath)
                {
                    if (view.SortDescriptions[0].Direction == System.ComponentModel.ListSortDirection.Ascending)
                    {
                        pager.Order = "desc";
                    }
                    else if (view.SortDescriptions[0].Direction == ListSortDirection.Descending)
                    {
                        pager.Order = "asc";
                    }
                }
            }
 
            LoadData();
        }

e.Column.SortMemberPath 爲點擊列頭的列名，問題就在e.Column.SortDirection 這個屬性，若是初始化的時候有指定那麼第一次點擊的時候能獲取到，可是再點擊這個屬性就是null了,沒有指定也是null,好了，我在這裏爲它賦值e.Column.SortDirection=ListSortDirection.Descending 可是下次點擊的時候它仍是爲null 不知爲什麼，網上沒有查到。通過很久摸索，用另外一個方法來

ICollectionView view = CollectionViewSource.GetDefaultView(dataGrid1.ItemsSource);

能夠從view.SortDescriptions 中取得有排序的列，判斷它集合大於0而且列名是當前點擊的列，若是當前是升序則變爲降序同時查詢降序的數據，固然最後還得執行清除排序再添加排序

view.SortDescriptions.Clear();  //先清除全部的排序
 SortDescription sd = new SortDescription("列名",  ListSortDirection.Descending);
 view.SortDescriptions.Add(sd);

這樣就實現了服務端排序，不知有無更簡單的方法。

補充：

文中提到：我在這裏爲它賦值e.Column.SortDirection=ListSortDirection.Descending，。這裏實際效果從新綁定數據後會丟失之前的排序。應該在綁定數據後再從新綁定列的排序狀態

因此我這裏這樣處理的，

一、後端記錄上次的排序狀態某列名升序仍是降序

二、綁定數據後，再次賦值當前的排序狀態。swich記錄的當前排序也就是從新綁定數據前的排序，case某列的排序狀態，而後gridResult2.Columns[2].SortDirection從新設置此列的排序狀態值。這樣就能在DataGridSortingEventArgs e e.Column.SortDirection 屬性中獲取到從新設置的排序值。這樣從新賦值，也能顯示自帶的排序小箭頭。不明白的能夠聯繫www.kaishanguai.com或qq369628105

switch (CurrentOrderByEnum)
{
case (OrderByEnum.OrderByNameAsc):
gridResult2.Columns[2].SortDirection = ListSortDirection.Ascending;
break;

case (OrderByEnum.OrderByNameDesc):
gridResult2.Columns[2].SortDirection = ListSortDirection.Descending;
break;

}

代碼：

                                <DataGrid x:Name="gridResult2" SelectionUnit="FullRow"  MinHeight="420"    EnableRowVirtualization ="False" GridLinesVisibility="None"  BorderThickness="0" AlternationCount="2" ItemsSource="{Binding}"  CanUserAddRows="False" HorizontalAlignment="Left"  VerticalAlignment="Top" AutoGenerateColumns="False" Visibility="Hidden"    IsReadOnly="True" SelectionMode="Extended"  Sorting="GridResult2_OnSorting"  MouseMove="GridResult2_OnMouseMove" MouseLeftButtonDown="GridResult2_OnMouseLeftButtonDown"  MouseLeftButtonUp="GridResult2_OnMouseLeftButtonUp" MouseRightButtonUp="ImageGrid_OnMouseRightButtonDown" LoadingRow="GridResult2_OnLoadingRow"   KeyDown="DataView_OnKeyDown" PreviewKeyDown="GridResult2_OnPreviewKeyDown">
                                    <!--SelectionChanged="GridResult2_OnSelectionChanged"  -->
                                    <!-- This is required to handle CTRL + C when something is selected in the DataGrid -->
                                    <DataGrid.CommandBindings>
                                        <CommandBinding Command="Copy" Executed="CopyCommand" />
                                    </DataGrid.CommandBindings>

                                    <!-- This is required to handle CTRL + C when something is selected in the DataGrid -->
                                    <DataGrid.InputBindings>
                                        <KeyBinding Key="C" Modifiers="Control" Command="Copy" />
                                    </DataGrid.InputBindings>
                                 
                               
                                    <DataGrid.Columns>
                                        <DataGridTemplateColumn>
                                            <DataGridTemplateColumn.HeaderTemplate>
                                                <DataTemplate>
                                                    <CheckBox  Name="ChkAll" ToolTip="All"  Content="All"   IsChecked="False" Unchecked="UnAll_Checked" Checked="All_Checked"></CheckBox>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.HeaderTemplate>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <CheckBox   Checked="ItemFile_OnChecked"  Unchecked="ItemFile_OnUnchecked" Tag="{Binding FilePath}" HorizontalAlignment="Center" x:Name="itemFile"   VerticalAlignment="Center" />
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTemplateColumn  Header="">
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <Image Source="{Binding SnapshotPath}" Height="20" Width="20" />
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTextColumn Header="Name" Binding="{Binding FileName}" />
                                        <DataGridTemplateColumn  Header="MD5">
                                            <DataGridTemplateColumn.HeaderStyle>
                                                <Style TargetType="DataGridColumnHeader">
                                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
                                                </Style>
                                            </DataGridTemplateColumn.HeaderStyle>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock HorizontalAlignment="Center" Text="{Binding FileMD5}"></TextBlock>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTemplateColumn  Header="Modified Date" CanUserSort="True" SortMemberPath="FileModifiedTime">
                                            <DataGridTemplateColumn.HeaderStyle>
                                                <Style TargetType="DataGridColumnHeader">
                                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
                                                </Style>
                                            </DataGridTemplateColumn.HeaderStyle>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock HorizontalAlignment="Center" Text="{Binding FileModifiedTime}"></TextBlock>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTextColumn Header="Path" Binding="{Binding FilePathNoName}" />

                                        <DataGridTemplateColumn  Header="Classify Type"  CanUserSort="True" SortMemberPath="ClassifyType">
                                            <DataGridTemplateColumn.HeaderStyle>
                                                <Style TargetType="DataGridColumnHeader">
                                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
                                                </Style>
                                            </DataGridTemplateColumn.HeaderStyle>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock HorizontalAlignment="Center" Text="{Binding ClassifyType}"></TextBlock>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTemplateColumn  Header="Type">
                                            <DataGridTemplateColumn.HeaderStyle>
                                                <Style TargetType="DataGridColumnHeader">
                                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
                                                </Style>
                                            </DataGridTemplateColumn.HeaderStyle>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock HorizontalAlignment="Center" Text="{Binding FileExtension}"></TextBlock>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>

                                        <DataGridTemplateColumn  Header="Size(KB)" CanUserSort="True"  SortMemberPath="FileSize">
                                            <DataGridTemplateColumn.HeaderStyle>
                                                <Style TargetType="DataGridColumnHeader">
                                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
                                                </Style>
                                            </DataGridTemplateColumn.HeaderStyle>
                                            <DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock HorizontalAlignment="Center" Text="{Binding FileSize, StringFormat={}{0:N0}}"></TextBlock>
                                                </DataTemplate>
                                            </DataGridTemplateColumn.CellTemplate>
                                        </DataGridTemplateColumn>
                                    </DataGrid.Columns>
                                </DataGrid>

//綁定數據後，從新設置排序狀態     
gridResult2.ItemsSource = bindDataList;
           //設置排序圖標
            if (IsClickSort)
            {
                switch (CurrentOrderByEnum)
                {
                    case (OrderByEnum.OrderByNameAsc):
                        gridResult2.Columns[2].SortDirection = ListSortDirection.Ascending ;
                        break;

                    case (OrderByEnum.OrderByNameDesc):
                        gridResult2.Columns[2].SortDirection = ListSortDirection.Descending;
                        break;

                    case (OrderByEnum.OrderByModifiedDateAsc):
                        gridResult2.Columns[4].SortDirection = ListSortDirection.Ascending ;
                        break;

                    case (OrderByEnum.OrderByModifiedDateDesc):
                        gridResult2.Columns[4].SortDirection = ListSortDirection.Descending;
                        break;

                    case (OrderByEnum.OrderByClassifyAsc):
                        gridResult2.Columns[6].SortDirection = ListSortDirection.Ascending;
                        break;

                    case (OrderByEnum.OrderByClassifyDesc):
                        gridResult2.Columns[6].SortDirection = ListSortDirection.Descending ;
                        break;

                    case (OrderByEnum.OrderBySizeAsc):
                        gridResult2.Columns[8].SortDirection = ListSortDirection.Ascending;
                        break;

                    case (OrderByEnum.OrderBySizeDesc):
                        gridResult2.Columns[8].SortDirection = ListSortDirection.Descending;
                        break;
                }
            }
            else
            {
                gridResult2.Columns[4].SortDirection = ListSortDirection.Descending;
            }

 
//排序事件
private void GridResult2_OnSorting(object sender, DataGridSortingEventArgs e)
        {
            ListSortDirection direction = (e.Column.SortDirection != ListSortDirection.Ascending) ?
             ListSortDirection.Ascending : ListSortDirection.Descending;
            bool sortAscending = direction == ListSortDirection.Ascending;
            
            switch (e.Column.SortMemberPath)
            {
                case ("FileName"):
                    if (sortAscending)
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByNameAsc;
                    }
                    else
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByNameDesc;
                    }

                    break;

                case ("FileModifiedTime"):
                    if (sortAscending)
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByModifiedDateAsc;
                    }
                    else
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByModifiedDateDesc;
                    }
                    break;

                case ("ClassifyType"):
                    if (sortAscending)
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByClassifyAsc;
                    }
                    else
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderByClassifyDesc;
                    }
                    break;

                case ("FileSize"):
                    if (sortAscending)
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderBySizeAsc;
                    }
                    else
                    {
                        CurrentOrderByEnum = OrderByEnum.OrderBySizeDesc;
                    }
                    break;
            }
            IsClickSort = true;
            Search();
            
        }