程序安装时检查是否已经安装.NETFramework

添加新项中添加一个安装程序类

using  System; using  System.Collections; using  System.ComponentModel; using  System.Configuration.Install; using  Microsoft.Win32; using  System.Diagnostics; using  System.IO; namespace  DOTNETCheck {    /**//// <summary>    /// CheckDotnet 的摘要说明。    /// </summary>    [RunInstaller(true)]    public class CheckDotnet : System.Configuration.Install.Installer    {        /**//// <summary>        /// 必需的设计器变量。        /// </summary>        private System.ComponentModel.Container components = null;        public CheckDotnet()        {            // 该调用是设计器所必需的。            InitializeComponent();            // TODO: 在 InitComponent 调用后添加任何初始化                    }        Component Designer generated code#region Component Designer generated code        /**//// <summary>        /// 设计器支持所需的方法 - 不要使用代码编辑器修改        /// 此方法的内容。        /// </summary>        private void InitializeComponent()        {            components = new System.ComponentModel.Container();        }        #endregion        public override void Install(System.Collections.IDictionary stateSaver)        {                    //入口            RegistryKey key=null;            key = Registry.LocalMachine.CreateSubKey("Software//Microsoft//.NETFramework//policy//v1.0");            if(key==null||key.GetValue("3705")==null)            {                    Process MyProcess=new Process();                     MyProcess.StartInfo.FileName="dotnetfx.exe";                    MyProcess.StartInfo.WindowStyle=ProcessWindowStyle.Hidden;                    MyProcess.Start();                    MyProcess.WaitForExit(); //等待程序执行                    MyProcess.Close();            }        }    }}