一，首先重载APP

 protected override void OnStartup(StartupEventArgs e)
        {
            if (e.Args != null && e.Args.Count() > 0)
            {
                this.Properties["str1"] = e.Args[0];
            }
            base.OnStartup(e);
        }

二，在需要接收的窗体的loaded事件中接收值

 private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            if (Application.Current.Properties["str1"] != null)
            {
                this.textBox2.Text = Application.Current.Properties["str1"].ToString();
            }
        }

测试代码

System.Diagnostics.ProcessStartInfo a = new System.Diagnostics.ProcessStartInfo(@"F:\WpfApplication3.exe", "12   23");
System.Diagnostics.Process.Start(a);