如何安装.NET Framework它尚未安装,只有当? [英] How to install .NET Framework only when it's not already installed?
问题描述
有没有一种方法来检查.NET Framework 4中已安装并安装它,只有当它不是系统?
Is there a way to check if the .NET Framework 4 has been installed and install it only when it's not in the system ?
我知道,如何确定,如果.NET Framework 4的是通过检查以下注册表项安装:
I know, how to determine, if the .NET Framework 4 is installed by checking the following registry key:
hasDotnet4 := RegKeyExists(HKEY_LOCAL_MACHINE,
'SOFTWARE\Microsoft\.NETFramework\policy\v4.0');
如何基于上述检查我有条件地运行在.NET Framework 4的安装?
How do I conditionally run the .NET Framework 4 installation based on the above check ?
推荐答案
你可以做最简单的,就是用 检查
的参数,它可以让你控制,如果从 [文件]
部分将被提取,或者如果从一定程序 [运行]
部分将被执行。下面的脚本code显示了它的用法的条件安装.NET Framework 4的:
The easiest you can do, is to use the Check
parameter, which allows you to control if a certain file from the [Files]
section will be extracted, or if a certain program from the [Run]
section will be executed. The following script code shows its usage for the conditional installation of the .NET Framework 4:
[Files]
Source: "dotNetFx40_Full_setup.exe"; DestDir: {tmp}; Flags: deleteafterinstall; Check: FrameworkIsNotInstalled
[Run]
Filename: "{tmp}\dotNetFx40_Full_setup.exe"; Check: FrameworkIsNotInstalled
[code]
function FrameworkIsNotInstalled: Boolean;
begin
Result := not RegKeyExists(HKEY_LOCAL_MACHINE, 'SOFTWARE\Microsoft\.NETFramework\policy\v4.0');
end;
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