从xaml.cs访问Vspackage中的接口属性

Question

我正在从我的StatusBar页面中的VSPackage1Package访问接口属性( xaml.cs )，但它总是返回null。而字符串属性返回期望值。请帮助我访问我的StatusBar页面上的xaml.cs属性。

VSPackage1Package:

using Microsoft.VisualStudio.Shell.Interop;
public sealed class VSPackage1Package : Package
    {
        private IVsStatusbar bar;      
        public IVsStatusbar StatusBar
        {
            get
            {
                if (bar == null)
                {
                    bar = GetService(typeof(SVsStatusbar)) as IVsStatusbar;
                }
                return bar;
            }
        }

        public VSPackage1Package()
        {

        }
    }

xaml.cs:

 public partial class TestWindowControl : UserControl
    {
        public void button_Click(object sender, RoutedEventArgs e)
        {
            VSPackage1Package package = new VSPackage1Package();
            package.StatusBar.SetText("my message");//Here Statusbar is null
        }
    }

Answer 1

我能够用xaml.cs访问GetGlobalService页面中的状态栏

VSPackage1Package:

 public static IVsStatusbar GetActiveStatusBar()
        {            
            return Package.GetGlobalService(typeof(SVsStatusbar)) as IVsStatusbar;            
        }

xaml.cs:

var statusBar = VSPackage1Package.GetActiveStatusBar();
statusBar.SetText("My message");