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ToolTipService.SetToolTip的报错问题?

• 2009年10月27日 15:00worldman

   
  

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  cs
   private void Button_Click(object sender, RoutedEventArgs e)
          {
              if (this.txttag.Visibility == Visibility.Collapsed && isCloseed)
              {
                  this.txttag.Visibility = Visibility.Visible;
                  this.isCloseed = true;
                  this.txttag.Focus();
              }
              else
                  this.txttag.Visibility = Visibility.Collapsed;
          }

          private void Button_Click_1(object sender, RoutedEventArgs e)
          {
              if (this.Tag.ToString() == "")
              {
                  //ToolTip tt = new ToolTip();
                  //tt.IsOpen = true;
                  //tt.Content = "参数不能为空";
                  ToolTipService.SetToolTip(btncontent, "参数不能为空");  在这个地方报错。。。。。不知道什么原因 
  报 未将对象引用设置到对象的实例
                  //this.btncontent.Dispatcher.BeginInvoke(() => ToolTipService.SetToolTip(this.btncontent, "参数不能为空"));
                  //MessageBox.Show("参数不能为空");
                  //this.Button_Click(null, null);
                  //return;
              }
          }

          bool isCloseed = true;
          private void txttag_LostFocus(object sender, RoutedEventArgs e)
          {
              isCloseed = false;
              this.Tag = this.txttag.Text;
              this.txttag.Visibility = Visibility.Collapsed;
              //MessageBox.Show(this.Tag.ToString());
          }

  xaml

  <UserControl x:Class="xbrother.silverlight.Controls.ControlView.ButtonView"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Width="100" Height="30" Tag="">
     
      <Button Click="Button_Click_1" x:Name="btncontent">
          <Grid Width="100">
              <Grid x:Name="LayoutRoot" Margin="0 0 30 0">
                  <TextBlock Text="123666655554" VerticalAlignment="Center" HorizontalAlignment="Center"></TextBlock>
                  <TextBox x:Name="txttag" LostFocus="txttag_LostFocus"  Visibility="Collapsed"></TextBox>
             </Grid>
              <Button Margin="0 0 10 0" HorizontalAlignment="Right" Click="Button_Click">
                  <Button.Template>
                      <ControlTemplate>
                          <Image Source="/Login;component/image/HighlightHS.png" VerticalAlignment="Center" HorizontalAlignment="Right" Width="16" Height="16"></Image>
                      </ControlTemplate>
                  </Button.Template>
              </Button>
             
          </Grid>
      </Button>
     
  </UserControl>
  

  • 已编辑worldman 2009年10月28日 2:33修改错误原代码
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