Question

我需要安装程序在安装程序开始复制新文件之前删除旧的安装目录（如果存在）。此文件夹包含在程序使用期间生成的一些文件和子文件夹，它们不包含在安装程序中。因此，我已经创建了自定义操作来执行此操作。

所以，一些代码。首先，自定义操作代码（没有什么特别的）：

[CustomAction]
        public static ActionResult RemoveOldDatabase(Session session)
        {

            bool removeDatabase = session.CustomActionData["RemoveDatabase"] == "true";
            string installDir = session.CustomActionData["InstallDir"];

            if (removeDatabase)
            {
                try
                {
                    Directory.Delete(installDir, true);
                }
                catch (Exception ex)
                {
                    session.Log(ex.StackTrace);
                }
            }

            return ActionResult.Success;
        }

和wix代码（它定义了自定义动作调用）：

<CustomAction Id="actionCheckServerName" BinaryKey="actionBinary" DllEntry="CheckServerName" Execute="immediate" Return="check" />
        <CustomAction Id="actionInstall" BinaryKey="actionBinary" DllEntry="Install" Execute="deferred" HideTarget="no" Impersonate ="no" Return="check"/>
        <CustomAction Id="actionUninstall" BinaryKey="actionBinary" DllEntry="Uninstall" Execute="deferred" HideTarget="no" Impersonate ="no" Return="check"/>

        <CustomAction Id="actionRemoveOldDatabase" BinaryKey="actionBinary" DllEntry="RemoveOldDatabase" Execute="deferred" HideTarget="no" Impersonate ="no" Return="ignore"/>


        <CustomAction Id="actionGetNetworkComputers" BinaryKey="actionBinary" DllEntry="GetNetworkComputers" Execute="immediate" Return="check"/>

        <CustomAction Id="SetInstallParameters" Return="check" Property="actionInstall" Value="InstallDir=[INSTALLDIR];ServerName=[SERVER_LIST];InstallMode=[SETUP_MODE];Single=[single];RemoveDatabase=[REMOVE_DATABASE]" />
        <CustomAction Id="SetUninstallParameters" Return="check" Property="actionUninstsall" Value="UnInstallDir=[INSTALLDIR];ServerName=[SERVER_LIST];UnInstallMode=[INSTALL_MODE]" />

        <CustomAction Id="SetRemoveOldDatabaseParameters" Return="check" Property="actionRemoveOldDatabase" Value="InstallDir=[INSTALLDIR];RemoveDatabase=[REMOVE_DATABASE]" />


        <InstallExecuteSequence>
            <Custom Action='AlreadyUpdated' After='FindRelatedProducts'>SELFFOUND</Custom>
            <Custom Action='NoDowngrade' After='FindRelatedProducts'>NEWERFOUND</Custom>

            <Custom Action="SetRemoveOldDatabaseParameters" Before="ProcessComponents"/>
            <Custom Action="actionRemoveOldDatabase" After="SetRemoveOldDatabaseParameters">NOT Installed AND NOT UPGRADINGPRODUCTCODE</Custom>

            <Custom Action="SetInstallParameters" Before="actionInstall"/>
            <Custom Action="SetUninstallParameters" Before="RemoveFiles">Installed AND NOT REINSTALL AND NOT UPGRADINGPRODUCTCODE</Custom>
            <Custom Action="actionInstall" Before="InstallFinalize">NOT Installed AND NOT UPGRADINGPRODUCTCODE</Custom>
            <Custom Action="actionUninstall" After="SetUninstallParameters">Installed AND NOT REINSTALL AND NOT UPGRADINGPRODUCTCODE</Custom>
        </InstallExecuteSequence>

有什么问题？如您所见，在安装程序开始复制新文件（已由SetRemoveOldDatabaseParameters设置了参数）之前，应该触发 actionRemoveOldDatabase 。所以 - 只应删除旧文件 - 但这不会发生。如果我这样做，操作 actionRemoveOldDatabase ，安装程序将在安装程序复制新文件后删除。所以 - 安装程序复制的所有新文件都将被删除。

我不明白为什么？如何仅删除旧的现有文件夹以及我的自定义操作删除所有复制文件的原因？

[编辑] 看来我已经知道了原因。在这种情况下，正在使用Install Dir（可能是Windows安装程序将其锁定），并在安装结束后发布。自定义操作将一直等到文件夹被释放，然后将其删除。不幸的是，为时已晚 - 文件夹已包含新文件。

你知道任何解决方法吗？

Answer 1

RemoveFile element旨在实现这一目标。您可以使用它来教MSI删除它未安装的应用程序数据。优点是在回滚期间文件将被放回原位。

您还可以使用RemoveFolder元素删除整个目录。通常，概念是*文件删除并指定文件夹。这不是递归的，因此您需要为可能已创建的任何子目录执行此操作。

编写自定义操作只是重新发明轮子并增加安装程序的脆弱性。只有在事先无法知道子目录时才应该使用它。在那种情况下，理想的情况是使用MSI中的临时行在安装时动态地将行发送到MSI中，并让MSI处理实际的删除。这允许回滚功能仍然有效。

这是一个非常简单的版本。可以通过从自定义表驱动数据而不是ComponentID和DirectoryID的常量字符串来改进它。

 public class RecursiveDeleteCustomAction
    {

        [CustomAction]
        public static ActionResult RecursiveDeleteCosting(Session session)
        {
            // SOMECOMPONENTID is the Id attribute of a component in your install that you want to use to trigger this happening
            const string ComponentID = "SOMECOMPONENTID";
            // SOMEDIRECTORYID would likely be INSTALLDIR or INSTALLLOCATION depending on your MSI
            const string DirectoryID = "SOMEDIRECTORYID";

            var result = ActionResult.Success;
            int index = 1;

            try
            {
                string installLocation = session[DirectoryID];
                session.Log("Directory to clean is {0}", installLocation);

                // Author rows for root directory
                // * means all files
                // null means the directory itself
                var fields = new object[] { "CLEANROOTFILES", ComponentID, "*", DirectoryID, 3 };
                InsertRecord(session, "RemoveFile", fields);
                fields = new object[] { "CLEANROOTDIRECTORY", ComponentID, "", DirectoryID, 3 };
                InsertRecord(session, "RemoveFile", fields);

                if( Directory.Exists(installLocation))
                {
                    foreach (string directory in Directory.GetDirectories(installLocation, "*", SearchOption.AllDirectories))
                    {
                        session.Log("Processing Subdirectory {0}", directory);
                        string key = string.Format("CLEANSUBFILES{0}", index);
                        string key2 = string.Format("CLEANSUBDIRECTORY{0}", index);
                        session[key] = directory;

                        fields = new object[] { key, ComponentID, "*", key, 3 };
                        InsertRecord(session, "RemoveFile", fields);

                        fields = new object[] { key2, ComponentID, "", key, 3 };
                        InsertRecord(session, "RemoveFile", fields);

                        index++;     
                    }
                }
            }
            catch (Exception ex)
            {
                session.Log(ex.Message);
                result = ActionResult.Failure;
            }

            return result;
        }
        private static void InsertRecord(Session session, string tableName, Object[] objects)
        {
            Database db = session.Database; 
            string sqlInsertSring = db.Tables[tableName].SqlInsertString + " TEMPORARY";
            session.Log("SqlInsertString is {0}", sqlInsertSring);
            View view = db.OpenView(sqlInsertSring); 
            view.Execute(new Record(objects)); 
            view.Close(); 
        }
    }

wix - 安装前删除旧程序文件夹

1 个答案: