当Thread运行时如何在WPF中的UI上显示加载面板

问题描述

在我的WPF应用程序中，我有一个带有两个用户控件的主窗口。



我的 Mainwindow.xaml 就像这样

In My WPF application, I have One Mainwindow with two user controls.

My Mainwindow.xaml like this

<Grid Name="MainGrid">
<my:Usercontrol1 HorizontalAlignment="Left" Margin="70,132,0,0" Name="dummy1" VerticalAlignment="Top" />
</Grid>

然后我的 UserControl.Xaml



这里我有一个网格包含连接到数据库的控件，加载需要时间，因为我正在使用一个loadingUserControl，如加载旋转图像。 br $> b $ b

Then my UserControl.Xaml

Here I am having one grid contains controls which is connecting to the database, it will take time to load, for that I am using one loadingUserControl like loading rotating image.

<Grid Height="300" Width="770" >
    <Grid Height="223" Width="334"  Margin="10,80,346,-20">

        <Label Width="90" Height="24" HorizontalContentAlignment="Right" VerticalContentAlignment="Center" FontFamily="Verdana" FontWeight="Normal" Margin="10,37,6,5" Grid.Column="1">Sql Server</Label>
        <Grid Grid.Column="2" Width="200" removed="White" Height="20" Margin="1,39,20,7">
            <ComboBox VerticalAlignment="Top" HorizontalAlignment="Left" removed="Transparent" Style="{StaticResource StyleForWidth200}" Margin="0,0,0,0" Name="cmbServerName" Width="200" Height="20" FontFamily="Verdana" IsEditable="True" StaysOpenOnEdit="True" ClipToBounds="False">

            </ComboBox>
        </Grid>
        <RadioButton Content="Trusted Connection" Grid.Column="2" Height="20" HorizontalAlignment="Left" Name="rbTrustedConnection" VerticalAlignment="Stretch" Width="200" FontFamily="Verdana" FontWeight="Normal" Margin="0,6,0,16" Grid.Row="1" Grid.RowSpan="2" FontSize="10" IsChecked="True" />
        <RadioButton Content="SQL Server Authentication" Grid.Column="2" Grid.Row="2" Height="16" HorizontalAlignment="Left" Name="rbSQLServerAuthentication" VerticalAlignment="Stretch" Width="200" FontFamily="Verdana" FontWeight="Normal" Margin="0,5,0,0" FontSize="10" />
        <Label  Width="90" Height="24" Grid.Row="3" HorizontalContentAlignment="Right" VerticalContentAlignment="Center" FontFamily="Verdana" FontWeight="Normal" Grid.Column="1" Margin="10,9,6,9">User Name</Label>
        <TextBox Grid.Column="2" Grid.Row="3" Name="txtUserName" Width="200" Height="20" HorizontalAlignment="Left" Text="" FontFamily="Verdana" FontWeight="Normal" Margin="0,11"></TextBox>
        <Label  Width="90" Height="24" Grid.Row="4" HorizontalContentAlignment="Right" VerticalContentAlignment="Center" FontFamily="Verdana" FontWeight="Normal" Grid.Column="1" Margin="10,2,6,2">Password</Label>
        <PasswordBox Grid.Column="2" Grid.Row="4" Width="200" Height="20" HorizontalAlignment="Left" FontFamily="Verdana" Name="txtPwdWord"/>
        <Button Grid.Column="2" Grid.Row="5" Name="btnConnect" Width="70" Height="30" Margin="131,0,20,5" Content="Connect" FontFamily="Verdana" FontWeight="Normal" Focusable="True" Style="{StaticResource NormalStyle11}" Click="btnConnect_Click"></Button>

        <my:LoadingControl x:Name="loadingControl1" Margin="0,70,0,0" Visibility="Visible" />
    </Grid>
</Grid>

In My代码后面的 UserControl1.cs

这里我使用线程

当它的加载数据库，LoadingControl应该旋转，一旦数据库加载了loadingControl应该被隐藏，为此我实现了以下代码。



这里我的问题是LoadingControl不是roatating并且应用程序获取挂起，但是当数据库加载lodingcontrol时被隐藏。



你能不能弄清楚我错过了什么。

In My code behind UserControl1.cs
here I am using threading
when its loading database, LoadingControl should be rotate,once database loaded loadingControl should be hidden, for that I implemented the following code.

here my problem is LoadingControl is not roatating and application get hangs, but when the database loaded lodingcontrol being hidden.

can you please figure out what I missed here.

private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            BindInstances = new Thread(new ThreadStart(ServerConnection));
            BindInstances.Start();

        }
private void ServerConnection()
        {

            if (Dispatcher.CheckAccess())
            {
                BindDefaultInstances(); 
                loadingControl1.Visibility = Visibility.Hidden;
            }
            else
            {
                Dispatcher.BeginInvoke(DispatcherPriority.Normal,new Action(ServerConnection));
            }

private void BindDefaultInstances()
        {
            DataAccess objIED_DAL = new DataAccess();
          
            DataTable dtInstanceList = new DataTable();
            dtInstanceList = objIED_DAL.GetInstances();
            if (dtInstanceList.Rows.Count > 0)
            {
                foreach (DataRow dr in dtInstanceList.Rows)
                {
                    cmbServerName.Items.Add(dr["ServerName"]);
                }
            }
        }

推荐答案

private void ServerConnection()
{
    DataAccess objIED_DAL = new DataAccess();

    DataTable dtInstanceList = new DataTable();
    dtInstanceList = objIED_DAL.GetInstances();

    if (dtInstanceList.Rows.Count > 0)
    {
        foreach (DataRow dr in dtInstanceList.Rows)
        {
            Dispatcher.BeginInvoke(new Action(() => cmbServerName.Items.Add(dr["ServerName"])));
        }
    }

    Dispatcher.BeginInvoke(new Action(() => loadingControl1.Visibility = Visibility.Hidden));
}

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