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我试过这种方式...所以，当我点击button1中的任何menuitem时，它将检查并检查第二个按钮中的相同menuitem ...但是有些错误在哪里...我想用更好的方式编写它因此，它将工作，因为我需要与任何issuse.here下面的代码，我做到目前为止...我如何解决这个问题以及如何改善这种编码... 这里是我的代码。 。始终出现错误 - “未将对象引用设置为对象的实例”。
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="50"/>
<RowDefinition Height="50"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal" FlowDirection="LeftToRight">
<Button Name="btnPhone" Content="Business" Click="OnbtnPhoneClick" ></Button>
<Button Name="ddBtnPhone" Width="25" Click="OnddBtnPhoneClick" Height="47">
<Button.Content>
<Path x:Name="btnArrow1" Margin="4" VerticalAlignment="Center" Width="10" Fill="#FF527DB5" Stretch="Uniform" HorizontalAlignment="Right" Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z "/>
</Button.Content>
<Button.ContextMenu>
<ContextMenu x:Name="cmPhone">
<MenuItem Header="Assistant " Name="mnIAssistant" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/> <MenuItem Header="Business" Name="mnIBusiness" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/> <MenuItem Header="Business 2 " Name="mnIBusiness2" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Business FAX " Name="mnIBusinessFAX" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Call Back" Name="mnICallback" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Car" Name="mnICar" Click="OnMenuItemChecked"/>
</ContextMenu>
</Button.ContextMenu>
</Button>
<TextBox Height="19" Name="textBox1" Width="120" />
</StackPanel>
<StackPanel Grid.Row="2" Orientation="Horizontal" FlowDirection="LeftToRight">
<Button Name="btnHome" Content="Home" Click="OnbtnHomeClick" Height="26" Width="64" />
<Button Name="ddBtnHome" Width="25" Click="OnddBtnHomeClick" Margin="0,0,0,5" >
<Button.Content>
<Path x:Name="btnArrow2" Margin="4" VerticalAlignment="Center" Width="10" Fill="#FF527DB5" Stretch="Uniform" HorizontalAlignment="Right" Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z "/>
</Button.Content>
<Button.ContextMenu>
<ContextMenu Name="cmHome">
<MenuItem Header="Assistant " Name="mnIAssistant1" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Business" Name="mnIBusiness1" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Business 2 " Name="mnIBusiness21" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Business FAX " Name="mnIBusinessFAX1" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Call Back" Name="mnICallback1" Checked="OnMenuItemChecked" Click="OnMenuItemClick"/>
<MenuItem Header="Car" Name="mnICar1" Click="OnMenuItemChecked"/>
</ContextMenu>
</Button.ContextMenu>
</Button>
<TextBox Height="23" Name="textBox2" Width="120" />
</StackPanel>
<Border Grid.Row="3" BorderThickness="2" BorderBrush="Blue">
<TextBlock Name="tbWebpage" Grid.Row="3" Background="White" VerticalAlignment="Top" Height="20">
<Hyperlink NavigateUri="tbWebpage.Text" RequestNavigate="Hyperlink_RequestNavigate"></Hyperlink>
</TextBlock>
</Border>
</Grid>
后面XAML代码
namespace MenuItemsChecked
{
public partial class MainWindow : Window
{
//string[] arrMenitems = { "business", "a1", "a2", "a3","a4" };
Button btnCommon = new Button();
TextBox txtCommon = new TextBox();
MenuItem mnItem;
public MainWindow()
{
InitializeComponent();
}
private void AddMenuItems(ContextMenu cMenu, Button btnName, TextBox txtBoxName)
{
//mnItem.Items.Add(arrMenitems);
if (cMenu.Items.Count != 0)
{
//mnItem = new MenuItem();
//mnItem.Header = "Business";
//mnItem.IsCheckable = true;
//cMenu.Items.Add(mnItem);
//mnItem = new MenuItem();
//mnItem.Header = "Assistant";
//mnItem.IsCheckable = true;
//cMenu.Items.Add(mnItem);
//mnItem = new MenuItem();
//mnItem.Header = "Business 2";
//mnItem.IsCheckable = true;
//cMenu.Items.Add(mnItem);
//mnItem = new MenuItem();
//mnItem.Header = "Business FAX";
//mnItem.IsCheckable = true;
//cMenu.Items.Add(mnItem);
//mnItem = new MenuItem();
//mnItem.Header = "Call Back";
//mnItem.IsCheckable = true;
//cMenu.Items.Add(mnItem);
//cMenu.Items.Add(mnItem);
//cmCommon = cMenu;
cMenu.AddHandler(MenuItem.ClickEvent, new RoutedEventHandler(OnMenuItemClick));
cMenu.AddHandler(MenuItem.MouseLeftButtonUpEvent, new MouseButtonEventHandler(OnMouseButtonUpEventClick));
// cMenu.AddHandler(MenuItem.CheckedEvent, new RoutedEventHandler(OnMenuItemChecked));
btnCommon = btnName;
//txtCommon = txtBoxName;
}
}
private void OnMenuItemChecked(object sender, RoutedEventArgs e)
{
RoutedEventArgs args = e as RoutedEventArgs;
MenuItem item = args.OriginalSource as MenuItem;
if (sender == mnIAssistant)
{
mnIAssistant.IsChecked = true;
mnIAssistant1.IsChecked = true;
}
if (sender == mnIBusiness)
{
mnIBusiness.IsChecked = true;
mnIBusiness1.IsChecked = true;
}
if (sender == mnIBusiness2)
{
mnIBusiness2.IsChecked = true;
mnIBusiness21.IsChecked = true;
}
if (sender == mnIBusinessFAX)
{
mnIBusinessFAX.IsChecked = true;
mnIBusinessFAX1.IsChecked = true;
}
if (sender == mnICallback)
{
mnICallback.IsChecked = true;
mnICallback1.IsChecked = true;
}
if (sender == mnICar)
{
mnICar.IsChecked = true;
mnICar1.IsChecked = true;
}
if (sender == mnIAssistant1)
{
mnIAssistant.IsChecked = true;
mnIAssistant1.IsChecked = true;
}
if (sender == mnIBusiness1)
{
mnIBusiness.IsChecked = true;
mnIBusiness1.IsChecked = true;
}
if (sender == mnIBusiness21)
{
mnIBusiness2.IsChecked = true;
mnIBusiness21.IsChecked = true;
}
if (sender == mnIBusinessFAX1)
{
mnIBusinessFAX.IsChecked = true;
mnIBusinessFAX1.IsChecked = true;
}
if (sender == mnICallback1)
{
mnICallback.IsChecked = true;
mnICallback1.IsChecked = true;
}
if (sender == mnICar1)
{
mnICar.IsChecked = true;
mnICar1.IsChecked = true;
}
}
private void OnMouseButtonUpEventClick(object sender, MouseButtonEventArgs e)
{
(sender as MenuItem).IsChecked = !(sender as MenuItem).IsChecked;
((sender as MenuItem).Parent as ContextMenu).IsOpen = false;
}
private void OnMenuItemClick(object sender, RoutedEventArgs e)
{
RoutedEventArgs args = e as RoutedEventArgs;
// MenuItem item = args.OriginalSource as MenuItem;
//string header = item.Header.ToString();
MenuItem menuitem = sender as MenuItem; ///always getting error-"Object reference not set to an instance of an object."
//ContextMenu cm = sender as ContextMenu;
string name = menuitem.Name;
string header = menuitem.Header.ToString();
if ((sender == mnIBusiness) |(sender == mnIBusiness1))
{
if (header == "Business")
{
mnIBusiness.IsChecked = true;
mnIBusiness1.IsChecked = true;
}
btnCommon.Content = header;
//item.IsCheckable = true;
}
else if ((sender == mnIAssistant) | (sender == mnIAssistant1))
{
if (header == "Assistant")
{
mnIAssistant.IsChecked = true;
mnIAssistant1.IsChecked = true;
}
btnCommon.Content = header;
///item.IsChecked = true;
}
else if ((sender == mnIBusiness2) | (sender == mnIBusiness21))
{
//if(header=="Business 2")
//{
mnIBusiness2.IsChecked = true;
mnIBusiness21.IsChecked = true;
//}
btnCommon.Content = header;
//item.IsChecked = true;
}
else if ((sender == mnIBusinessFAX) |(sender == mnIBusinessFAX1))
{
if(header=="Business FAX")
{
mnIBusinessFAX.IsChecked = true;
mnIBusinessFAX1.IsChecked = true;
}
btnCommon.Content = header;
//item.IsChecked = true;
}
else if ((sender == mnICallback1) | (sender == mnICallback))
{
if (header == "Call Back")
{
mnICallback.IsChecked = true;
mnICallback1.IsChecked = true;
}
btnCommon.Content = header;
//item.IsChecked = true;
}
else
{
if (header == "Car")
{
mnICar.IsChecked = true;
mnICar1.IsChecked = true;
}
btnCommon.Content = header;
}
txtCommon.Text = string.Empty;
}
private void OnddBtnPhoneClick(object sender, RoutedEventArgs e)
{
ButtonContextMenuDisplay(sender);
AddMenuItems(cmPhone, btnPhone, textBox1);
}
private void OnbtnPhoneClick(object sender, RoutedEventArgs e)
{
}
private void OnbtnHomeClick(object sender, RoutedEventArgs e)
{
}
private void OnddBtnHomeClick(object sender, RoutedEventArgs e)
{
ButtonContextMenuDisplay(sender);
AddMenuItems(cmHome, btnHome, textBox2);
}
private void ButtonContextMenuDisplay(object sender)
{
(sender as Button).ContextMenu.IsEnabled = true;
(sender as Button).ContextMenu.PlacementTarget = (sender as Button);
(sender as Button).ContextMenu.IsOpen = true;
(sender as Button).ContextMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
}
}
}
哎基达是你的问题得到有效解决.. – loop
没有，没有......，我仍然得到同样的异常 – kida
看起来这个问题是由于空引用，所以无论你刚刚得到这个断点thr，看看它为什么变得空。 – loop