System.NullReferenceException 中第一次偶然出现的“GetproductCode.exe”类型的异常求解,谢谢

billboywu 2014-06-26 11:49:00

下面这段取注册表ProductCode的代码是网上找的,但是我用VS 2010调试运行时却报
在 System.NullReferenceException 中第一次偶然出现的“GetproductCode.exe”类型的异常

请问是什么原因,我要怎么才能取到ProductCode,谢谢

       

 public static string GetProductCode(string displayName)

        {

            string productCode = string.Empty;

            string[] SubKeyNames;

            //string[] valueNames;

            string displayname;

            //string info;

            // 如果是32位操作系统，（或者系统是64位，程序也是64位）

            string bit32 = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

            // 如果操作系统是64位并且程序是32位的

            string bit64 = @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall";

            RegistryKey localMachine = Registry.LocalMachine;

            RegistryKey Uninstall = localMachine.OpenSubKey(bit32, true);

            SubKeyNames = Uninstall.GetSubKeyNames();



            foreach (string subkey in SubKeyNames)

            {

                RegistryKey productcode = Uninstall.OpenSubKey(subkey);

                //valueNames = productcode.GetValueNames();

                //foreach (string valueName in valueNames)

                //{

                //    int i = valueName.IndexOf("DisplayName");

                //    if (i != -1)

                //    {

                //        RegistryKey myreg = Uninstall.OpenSubKey();

                //        info = myreg.GetValue(valueName).ToString();

                //        MessageBox.Show("结果的值是:" + info);

                //    }

                //}

                    displayname = productcode.GetValue("DisplayName").ToString();

                    //if (displayname == displayName)

                    if (displayname.IndexOf( displayName)!=-1)

                    {

                        MessageBox.Show(displayname);



                        string uninstallString = productcode.GetValue("UninstallString").ToString();

                        string[] strs = uninstallString.Split(new char[2] { '{', '}' });

                        productCode = strs[1];

                        return productCode;

                    }

                

            }

            return productCode;

        }

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billboywu 2014-06-27

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我试下行不行

billboywu 2014-06-27

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哦,有可能,我的是8.1的系统.

billboywu 2014-06-27

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现在这个代码不会提示了,但是取不到"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall"下面的值,取出的值是在 "SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall";下面的,加上下面这句也不行,请问是什么原因?谢谢 RegistryKey Uninstall = localMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall",

 
public static string GetProductCode(string displayName)
        {
            string productCode = string.Empty;
            string[] SubKeyNames;
            string[] valueNames;
            string displayname;
            string info;
            // 如果是32位操作系统，（或者系统是64位，程序也是64位）
            string bit32 = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
            // 如果操作系统是64位并且程序是32位的
            string bit64 = "SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
            RegistryKey localMachine = Registry.LocalMachine;
            RegistryKey Uninstall = localMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall", true);
            SubKeyNames = Uninstall.GetSubKeyNames();

            foreach (string subkey in SubKeyNames)
            {
                RegistryKey productcode = Uninstall.OpenSubKey(subkey);
                valueNames = productcode.GetValueNames();
                foreach (string valueName in valueNames)
                {
                    
                    if(valueName=="DisplayName")
                    {
                        RegistryKey myreg = Uninstall.OpenSubKey(subkey);
                        info = myreg.GetValue(valueName).ToString();
                        MessageBox.Show(subkey+"的程序名称是:" + info);
                    }
                }
                    //displayname = productcode.GetValue("DisplayName").ToString();
                    ////if (displayname == displayName)
                    //if (displayname.IndexOf( displayName)!=-1)
                    //{
                    //    MessageBox.Show(displayname);

                //string uninstallString = productcode.GetValue("UninstallString").ToString();
                //string[] strs = uninstallString.Split(new char[2] { '{', '}' });
                //productCode = strs[1];
                //return productCode;
                    //}
                
            }
            return productCode;
        }

poko 2014-06-27