WPF DataGrid使用 自动显示行号、全选、三级联动、拖拽

1.DataGrid的使用自动显示行号(修复删除行时行号显示不正确)




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Code

dgTool.LoadingRow += new EventHandler<DataGridRowEventArgs>(dgTool_LoadingRow);
dgTool.UnloadingRow +=new EventHandler<DataGridRowEventArgs>(dgTool_UnloadingRow);

void dgTool_LoadingRow(object sender, DataGridRowEventArgs e)
{
e.Row.Header = e.Row.GetIndex() + 1;
}

void dgTool_UnloadingRow(object sender, DataGridRowEventArgs e)
{
dgTool_LoadingRow(sender, e);
if (dgTool.Items != null)
{
for (int i = 0; i < dgTool.Items.Count; i++)
{
try
{
DataGridRow row = dgTool.ItemContainerGenerator.ContainerFromIndex(i) as DataGridRow;
if (row != null)
{
row.Header = (i + 1).ToString();
}
}
catch { }
}
}

}

 

2.DataGrid新建一行，并为需要的单元格提供默认值




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Code

dgTool.InitializingNewItem += new InitializingNewItemEventHandler(dgTool_InitializingNewItem);
dgTool.RowEditEnding += new EventHandler<DataGridRowEditEndingEventArgs>(dgTool_RowEditEnding);

private void dgTool_InitializingNewItem(object sender, InitializingNewItemEventArgs e)
{
//这里的实体为你绑定数据源中的实体类型
EntityType newItem = e.NewItem as EntityType;
newItem.ID = dgTool.Items.Count - 2;
}
//这里是为了解决添加完成一行数据之后,行号显示不正确（当然还可以做其他操作)
void dgTool_RowEditEnding(object sender, DataGridRowEditEndingEventArgs e)
{
if (dgTool.Items != null)
{
for (int i = 0; i < dgTool.Items.Count; i++)
{

try
{
DataGridRow row = dgTool.ItemContainerGenerator.ContainerFromIndex(i) as DataGridRow;
if (row != null)
{
row.Header = (i + 1).ToString();
}
}
catch { }
}
}
}

 

 3.DataGrid实现全选和单选
1)DataGrid绑定数据实体类Entity




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Code

public class Entity : INotifyPropertyChanged
{

//标记是否删除
private bool isChecked = false;
public bool IsChecked
{
get
{
return isChecked;
}
set
{
isChecked = value;
NotifyPropertyChanged("IsChecked");
}
}

//序号
private int id = 0;
public int ID
{
get { return id; }
set
{
id = value;
NotifyPropertyChanged("ID");
}
}

public event PropertyChangedEventHandler PropertyChanged;

public void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}

}

2）前台界面XAML




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Code

<DataGrid x:Name="dgTool" Grid.Row="2"  SelectionChanged="dgTool_SelectionChanged"  RowHeaderWidth="50" FontFamily="Microsoft YaHei" FontSize="16" FontWeight="Normal" SelectionMode="Single"  AutoGenerateColumns="False" CanUserAddRows="True" CanUserDeleteRows="True" IsReadOnly="False" CanUserSortColumns="False"  AlternatingRowBackground="LightGray">
<DataGrid.ColumnHeaderStyle>
<Style TargetType="DataGridColumnHeader">
<Setter Property="HorizontalContentAlignment" Value="Center">
</Setter>
</Style>
</DataGrid.ColumnHeaderStyle>
<DataGrid.Columns>
<DataGridTemplateColumn>
<DataGridTemplateColumn.Header>
<CheckBox Name="selectAll_checkBox" Content="全选" IsThreeState="True"   HorizontalAlignment="Center" Click="selectAll_checkBox_Click" />
</DataGridTemplateColumn.Header>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="select_checkBox"  IsChecked="{Binding Path=IsChecked}"  Click="select_checkBox_Click"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="ID" Width="*" Binding="{Binding Path=ID}"/>
</DataGrid.Columns>

</DataGrid>

3）后台事件




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Code

int count = 0;
private void select_checkBox_Click(object sender, RoutedEventArgs e)
{
//因为我前台做的是单项绑定，所有要手动修改数据源IsChecked属性,因为我要统计勾选的个数
//做成双向绑定的话(将IsChecked="{Binding Path=IsChecked}" 改成 IsChecked="{Binding Path=IsChecked,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"即可)，就不需要手动修改IsChecked属性了,但还是要统计个数
var item = dgTool.SelectedItem;
if (item != null)
{
Entity entity = item as Entity;
if (entity == null) return;
if ((bool)((System.Windows.Controls.Primitives.ToggleButton)(sender)).IsChecked)
{
entity.IsChecked = true;
count++;
}
else
{
entity.IsChecked = false;
count--;
}
//根据勾选的个数，改变列头的状态 全选、全不选、部分选
CheckBox cb = this.FindName("selectAll_checkBox") as CheckBox;
cb.IsThreeState = true;
if (cb != null)
{
if (count == 0) cb.IsChecked = false;
List<Entity> source = dgTool.ItemsSource as List<Entity>;
if (source != null)
{
if (count == source.Count) cb.IsChecked = true;
else cb.IsChecked = null;

}
}

}
}

private void selectAll_checkBox_Click(object sender, RoutedEventArgs e)
{
List<Entity> source = dgTool.ItemsSource as List<Entity>;
if (source == null) return;
bool? isThreeStatus = ((System.Windows.Controls.Primitives.ToggleButton)(sender)).IsChecked;
if (isThreeStatus == null) return;
if ((bool)isThreeStatus)
{
foreach (Entity each in source)
{
each.IsChecked = true;
}
count = source.Count;
}
else
{
foreach (Entity each in source)
{
each.IsChecked = false;
}
count = 0;
}

}

4）删除按钮事件




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Code

//删除按钮事件
private void btnDelRows_Click(object sender, RoutedEventArgs e)
{
List<Entity> source = dgTool.ItemsSource as List<Entity>;
if (source == null) return;
int count = 0;
for (int i = 0; i < source.Count; i++)
{
Entity temp = source[i];
if (temp.IsChecked)
{
source.Remove(temp);    //因为删除导致后面的项成为当前项
i--;    //所有索引应该不变，由于后面i会加1，先减一
count++;
}
}
if (count == 0) MessageBox.Show("请选择要删除的行");
else
{
MessageBox.Show("共删除" + count + "条记录");
}
dgTool.Items.Refresh();     //对DataGrid刷新数据  如果DataGrid中添加了排序则只能用下面的进行刷新
ICollectionView dataView = CollectionViewSource.GetDefaultView(dgTool.ItemsSource);
dataView.SortDescriptions.Add(new SortDescription("ID", ListSortDirection.Ascending));
dataView.Refresh();
}

 

4.三级联动
1）业务实体




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Code

public class Entity : INotifyPropertyChanged
{

//标记是否删除
private bool isChecked = false;
public bool IsChecked
{
get
{
return isChecked;
}
set
{
isChecked = value;
NotifyPropertyChanged("IsChecked");
}
}

//序号
private int id = 0;
public int ID
{
get { return id; }
set
{
id = value;
NotifyPropertyChanged("ID");
}
}
//省
private int provinceNo = 0;
public int ProvinceNo
{
get { return provinceNo; }
set
{
provinceNo = value;
NotifyPropertyChanged("ProvinceNo");
}
}
private string provinceName = string.Empty;
public string ProvinceName
{
get { return provinceName; }
set
{
provinceName = value;
NotifyPropertyChanged("ProvinceName");
}
}

//市
private int cityNo = 0;
public int CityNo
{
get { return cityNo; }
set
{
cityNo = value;
NotifyPropertyChanged("CityNo");
}
}
private string cityName = string.Empty;
public string CityName
{
get { return cityName; }
set
{
cityName = value;
NotifyPropertyChanged("CityName");
}
}

//县
private int countyNo = 0;
public int CountyNo
{
get { return countyNo; }
set
{
countyNo = value;
NotifyPropertyChanged("CountyNo");
}
}
private string countyName = string.Empty;
public string CountyName
{
get { return countyName; }
set
{
countyName = value;
NotifyPropertyChanged("CountyName");
}
}

public event PropertyChangedEventHandler PropertyChanged;

public void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}

}

2)前台界面




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Code

<DataGrid x:Name="dgTool" Grid.Row="2"  SelectionChanged="dgTool_SelectionChanged" RowHeaderWidth="50" FontFamily="Microsoft YaHei" FontSize="16" FontWeight="Normal" SelectionMode="Single"  AutoGenerateColumns="False" CanUserAddRows="True" CanUserDeleteRows="True" IsReadOnly="False" CanUserSortColumns="False"  AlternatingRowBackground="LightGray" >
<DataGrid.ColumnHeaderStyle>
<Style TargetType="DataGridColumnHeader">
<Setter Property="HorizontalContentAlignment" Value="Center">
</Setter>
</Style>
</DataGrid.ColumnHeaderStyle>
<DataGrid.Columns>
<DataGridTemplateColumn>
<DataGridTemplateColumn.Header>
<CheckBox Name="selectAll_checkBox" Content="全选" IsThreeState="True"   HorizontalAlignment="Center" Click="selectAll_checkBox_Click" />
</DataGridTemplateColumn.Header>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="select_checkBox"  IsChecked="{Binding Path=IsChecked,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"  Click="select_checkBox_Click"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="ID" Width="*" Binding="{Binding Path=ID}"/>
<!--<DataGridComboBoxColumn x:Name="cbbProvinceName" Header="省" Width="*" TextBinding="{Binding Path=ProvinceName}"  />-->
<DataGridTemplateColumn Header="省" Width="*">
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="cbbProvinceName" Text="{Binding Path=ProvinceName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" IsSynchronizedWithCurrentItem="False" Loaded="cbbProvinceName_Loaded"  SelectionChanged="cbbProvinceName_SelectionChanged" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate >
<TextBlock Text="{Binding  Path=ProvinceName, Mode=OneWay}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="市" Width="*">
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="cbbCityName" Text="{Binding Path=CityName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"  IsSynchronizedWithCurrentItem="False" Loaded="cbbCityName_Loaded"  SelectionChanged="cbbCityName_SelectionChanged">
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate >
<TextBlock Text="{Binding  Path=CityName, Mode=OneWay}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

<DataGridTemplateColumn Header="县" Width="*">
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="cbbCountyName" Text="{Binding Path=CountyName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"  IsSynchronizedWithCurrentItem="False" Loaded="cbbCountyName_Loaded"  SelectionChanged="cbbCountyName_SelectionChanged" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate >
<TextBlock Text="{Binding  Path=CountyName}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>

</DataGrid>

3)后台逻辑




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Code

int rowIndex = -1;
private void dgTool_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
rowIndex = ((System.Windows.Controls.DataGrid)((sender))).SelectedIndex;
}

      处理省逻辑




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Code

private void cbbProvinceName_Loaded(object sender, RoutedEventArgs e)
{
var cbbProvinceNam = sender as ComboBox;
cbbProvinceNam.ItemsSource = provinceSource;
cbbProvinceNam.SelectedValuePath = "ProvinceNo";
cbbProvinceNam.DisplayMemberPath = "ProvinceName";
}

private void cbbProvinceName_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var cbbProvinceName = sender as ComboBox;
var rowData = source.ElementAt(rowIndex);
if (cbbProvinceName != null && cbbProvinceName.SelectedValue != null)
{
rowData.ProvinceNo = int.Parse(cbbProvinceName.SelectedValue.ToString());
}

rowData.CityNo = -1;
rowData.CityName = string.Empty;
rowData.CountyNo = -1;
rowData.CountyName = string.Empty;
}

　　处理市逻辑




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Code

private void cbbCityName_Loaded(object sender, RoutedEventArgs e)
{
var cbbCityName = sender as ComboBox;
var rowData = source.ElementAt(rowIndex);
if (rowData != null)
{
if (String.IsNullOrEmpty(rowData.ProvinceName))
{
MessageBox.Show("请先选择省");
e.Handled = true;
return;
}
else
{
cbbCityName.ItemsSource = citySource;
cbbCityName.SelectedValuePath = "CityNo";
cbbCityName.DisplayMemberPath = "CityName";
}
}
}

private void cbbCityName_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var rowData = source.ElementAt(rowIndex);
rowData.CountyName = string.Empty;
rowData.CountyNo = -1;
}

　　处理县逻辑




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Code

private void cbbCountyName_Loaded(object sender, RoutedEventArgs e)
{
var cbbCountyName = sender as ComboBox;
var rowData = source.ElementAt(rowIndex);
if (rowData != null)
{
e.Handled = true;
return;
}
if (String.IsNullOrEmpty(rowData.ProvinceName))
{
MessageBox.Show("请先选择省");
e.Handled = true;
return;
}
else
{
if (string.IsNullOrEmpty(rowData.CityName))
{
MessageBox.Show("请先选择市");
e.Handled = true;
return;
}
else
{

cbbCountyName.ItemsSource = countySource;
cbbCountyName.DisplayMemberPath = "CountyName";
cbbCountyName.SelectedValuePath = "CountyNo";

}
}
}

private void cbbCountyName_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var cbbCountyName = sender as ComboBox;
var rowData = source.ElementAt(rowIndex);
if (cbbCountyName != null && cbbCountyName.SelectedValue != null)
rowData.CountyNo = int.Parse(cbbCountyName.SelectedValue.ToString());
}