写在前面
前一篇文章介绍了ArcGIS Pro SDK for Microsoft .NET开发环境的搭建，并且在文章最后我们创建了一个demo并让它成功运行。这一篇文章我们介绍下如何在前面创建的demo基础之上增加一个登录页面。
操作步骤
1、打开上一节创建的demo代码，然后在"UI"文件夹上面鼠标右击，依次选择【添加 | 新建项】，在打开的新建项窗口选择新建一个WPF的窗口，并为其取名为"Login"，如下图所示：
2、新建Login窗口之后，我们的右侧项目代码UI目录下会出现新建的Login窗口代码文件，如下所示：
3、鼠标双击新建的Login窗口代码文件，然后在左侧的设计窗口将【工具栏】中的Label、Button、TextBox控件拖动至Login的设计器面板，最终形成如下所示的一个窗体：
4、然后鼠标依次点击此页面中的登录和取消两个按钮，在右下方的属性面板中给这两个分别设置名称，如下：
5、在设计器面板分别鼠标双击登录和取消按钮，分别为这两个按钮绑定点击事件，在这里就做一些简单的操作，点击登录按钮时不进行登录校验，只需要打开后续的面板即可，点击取消按钮时就让系统退出，代码如下：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Shapes;namespace ProConfigurationdemo2.UI{/// <summary>/// Login.xaml 的交互逻辑/// </summary>public partial class Login : Window{public Login(){InitializeComponent();}private void login_btn_Click(object sender, RoutedEventArgs e){//实现登录验证相关的代码this.DialogResult = true;}private void login_cance_btn_Click(object sender, RoutedEventArgs e){//取消登录this.DialogResult = false;}}}
6、然后在代码目录结构中双击UI目录下的SplashScreen.xaml文件，打开此页面的设计器面板，这个面板默认会展示我们的项目名称，我们在这里将展示的文字修改成我们系统的名称，如下：
7、双击代码目录中的ConfigurationManager1.cs代码文件，然后在此代码文件中新建ConfigurationManager1构造函数，并且在构造函数中实例化我们之前新建的Login面板，这样一来，我们项目启动时会首先打开新建的登录面板，然后只有我们点击登录时才会真正进入系统，如下：
using ArcGIS.Core.CIM;using ArcGIS.Core.Data;using ArcGIS.Core.Geometry;using ArcGIS.Desktop.Catalog;using ArcGIS.Desktop.Core;using ArcGIS.Desktop.Editing;using ArcGIS.Desktop.Extensions;using ArcGIS.Desktop.Framework;using ArcGIS.Desktop.Framework.Contracts;using ArcGIS.Desktop.Framework.Dialogs;using ArcGIS.Desktop.Framework.Threading.Tasks;using ArcGIS.Desktop.Mapping;using ProConfigurationdemo2.UI;using System;using System.Collections.Generic;using ponentModel;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;namespace ProConfigurationdemo2{internal class ConfigurationManager1 : ConfigurationManager{public ConfigurationManager1(){//启用login页面//只有在调用Application对象的Shutdown方法时，应用程序才会关闭System.Windows.Application.Current.ShutdownMode = System.Windows.ShutdownMode.OnExplicitShutdown;Login login = new Login();if((bool)login.ShowDialog()){login.Close();}else{Environment.Exit(0);}}/// <summary>/// Replaces the default ArcGIS Pro application name/// </summary>protected override string ApplicationName{get { return "ProConfigurationdemo2"; }}/// <summary>/// Replaces the ArcGIS Pro Main window icon./// </summary>protected override ImageSource Icon{get{return new BitmapImage(new Uri(@"pack://application:,,,/ProConfigurationdemo2;component/Images/favicon.ico"));}}#region Override Startup Pageprivate StartPageViewModel _vm;/// <summary>/// Called before ArcGIS Pro starts up. Replaces the default Pro start-up page (Optional)/// </summary>/// <returns> Implemented UserControl with start-up page functionality. /// Return null if a custom start-up page is not needed. Default ArcGIS Pro start-up page will be displayed.</returns>protected override System.Windows.FrameworkElement OnShowStartPage(){if (_vm == null){_vm = new StartPageViewModel();}var page = new StartPage();page.DataContext = _vm;return page;}///<summary>///During the start up this method is called after it is safe to access Portal and use ArcGIS.Desktop.Core. ///ArcGIS Pro Theme has already been set. ///</summary>///<param name="cancelEventArgs">///To cancel initialization, set the cancelEventArgs.Cancel property to true.///</param>protected override void OnApplicationInitializing(CancelEventArgs cancelEventArgs){}///<summary>///During the start up this method is called after the Application Window Start page is ready. From here on calls to ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask are safe.///ArcGIS Pro Extension modules can now be accessed. ///</summary>protected override void OnApplicationReady(){}#endregion#region Override Splash screen/// <summary>/// Called while ArcGIS Pro starts up. Replaces the default Pro splash screen. (Optional)/// </summary>/// <returns>Implemented Window with splash screen functionality. /// Return null if a custom splash screen is not needed. Default ArcGIS Pro splash screen will be displayed.</returns>protected override System.Windows.Window OnShowSplashScreen(){return new SplashScreen();}#endregion#region Override About page/// <summary>/// Customized UserControl is displayed in ArcGIS Pro About property page. Allows to add information about this specific managed configuration./// </summary>/// <returns>Implemented UserControl with about box information. /// Return null if a custom about box is not needed. Default ArcGIS Pro About box will be displayed.</returns>protected override System.Windows.FrameworkElement OnShowAboutPage(){return new AboutPage();}#endregion}}
8、此时我们启动项目，发现系统首先进入登录面板，然后我们点击登录按钮时，才会出现之前我们创建的demo系统界面，如下所示：
9、至此，我们的登陆界面定制开发完成。当然，我们在此处仅仅是介绍了如何新建一个登录页面，并将其注册为系统起始页的方法，里面的逻辑代码并没有详细的编写，大家在实际项目中自己编写登录页面的逻辑代码即可。
