做项目练习时，不小心删除了文件

又添加了APP.xaml，运行出现了HRMsys.exe”不包含适合于入口点的静态“Main”方法问题

和以前做过的项目做对比，程序的如果地址在App.xaml中，而运行出错的显然没有程序口地址

using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Linq;using System.Threading.Tasks;using System.Windows;namespace Customerapp{    /// 
    /// App.xaml 的交互逻辑    /// 
    public partial class App : Application    {    }}

　　

APP 转到定义，两段代码对比，一切尽在不言中。

namespace HRMsys.UI {            /// 
    /// App    /// 
    public partial class App : System.Windows.Application, System.Windows.Markup.IComponentConnector {                private bool _contentLoaded;                /// 
        /// InitializeComponent        /// 
        [System.Diagnostics.DebuggerNonUserCodeAttribute()]        [System.CodeDom.Compiler.GeneratedCodeAttribute("PresentationBuildTasks", "4.0.0.0")]        public void InitializeComponent() {                        #line 4 "..\..\App.xaml"            this.StartupUri = new System.Uri("MainWindow.xaml", System.UriKind.Relative);                        #line default            #line hidden            if (_contentLoaded) {                return;            }            _contentLoaded = true;            System.Uri resourceLocater = new System.Uri("/HRMsys;component/app.xaml", System.UriKind.Relative);                        #line 1 "..\..\App.xaml"            System.Windows.Application.LoadComponent(this, resourceLocater);                        #line default            #line hidden        }                [System.Diagnostics.DebuggerNonUserCodeAttribute()]        [System.CodeDom.Compiler.GeneratedCodeAttribute("PresentationBuildTasks", "4.0.0.0")]        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]        [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes")]        [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]        [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]        void System.Windows.Markup.IComponentConnector.Connect(int connectionId, object target) {            this._contentLoaded = true;        }    }}

　　

namespace Customerapp {            /// 
    /// App    /// 
    public partial class App : System.Windows.Application {                /// 
        /// InitializeComponent        /// 
        [System.Diagnostics.DebuggerNonUserCodeAttribute()]        [System.CodeDom.Compiler.GeneratedCodeAttribute("PresentationBuildTasks", "4.0.0.0")]        public void InitializeComponent() {                        #line 4 "..\..\App.xaml"            this.StartupUri = new System.Uri("MainWindow.xaml", System.UriKind.Relative);                        #line default            #line hidden        }                /// 
        /// Application Entry Point.        /// 
        [System.STAThreadAttribute()]        [System.Diagnostics.DebuggerNonUserCodeAttribute()]        [System.CodeDom.Compiler.GeneratedCodeAttribute("PresentationBuildTasks", "4.0.0.0")]        public static void Main() {            Customerapp.App app = new Customerapp.App();            app.InitializeComponent();            app.Run();        }    }}