为了不击败dead horse,但是,我正在寻找一种检测安装的.NET框架的方法。似乎所提供的解决方案(在链接中)都很好,直到发布了该框架的新版本,然后所有赌注都没有了。其原因是,检测依赖于注册表项,并且框架的v4似乎违反了约定,现在必须采取额外的步骤来检测v4。

有没有一种方法可以检测到.NET v5出现时也会起作用的.NET框架。

编辑:好的,对于受挫的.NET版本搜寻器的后代,以下是实现它的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Diagnostics;
using Microsoft.Win32;

private List<string> GetInstalledDotNetFrameworks()
{
    string key = string.Empty;
    string version = string.Empty;
    List<string> frameworks = new List<string>();

    var matches = Registry.LocalMachine
                .OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP")
                .GetSubKeyNames().Where(keyname => Regex.IsMatch(keyname, @"^v\d"));


    // special handling for v4.0 (deprecated) and v4 (has subkeys with info)
    foreach (var item in matches)
    {
        switch (item)
        {
            case "v4.0":  // deprecated - ignore
                break;

            case "v4":// get more info from subkeys

                key = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\" + item;
                string[] subkeys = Registry.LocalMachine
                    .OpenSubKey(key)
                    .GetSubKeyNames();


                foreach (var subkey in subkeys)
                {
                    key = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\" + item + @"\" + subkey;
                    version = Registry.LocalMachine
                            .OpenSubKey(key)
                            .GetValue("Version").ToString();

                    version = string.Format("{0} ({1})", version, subkey);
                    frameworks.Add(version);
                }


                break;
            case "v1.1.4322":   // special case, as the framework does not follow convention
                frameworks.Add(item);
                break;
            default:

                try
                {
                    // get the Version value
                    key = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\" + item;
                    version = Registry.LocalMachine
                            .OpenSubKey(key)
                            .GetValue("Version").ToString();

                    frameworks.Add(version);

                }
                catch
                {
                    // most likely new .NET Framework got introduced and broke the convention
                }

                break;

        }

    }

    // sort the list, just in case the registry was not sorted
    frameworks.Sort();

    return frameworks;
}

最佳答案

简而言之,您可以大致使用它(有关更多完整的解决方案,请参见下文):

Microsoft.Win32.Registry.LocalMachine
    .OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP")
    .GetSubKeyNames().Where(keyname=>Regex.IsMatch(keyname,@"^v\d"))


在我的机器上,这将返回:v2.0.50727,v3.0,v3.5,v4,v4.0。子项可用于检测Service Pack(可能相关)。另外,使用键SOFTWARE\Microsoft\.NETFramework返回v2.0.50727,v3.0和v4.0.30319-嗯,可爱,稍有不同!

不能保证该模式会一直保持,但这是一个相当合理的选择:-)。 http://support.microsoft.com/kb/318785具有有关描述版本控制的注册表详细信息的更多信息,特别是,您可能需要检查Install-但这很棘手,如v4.0所示。

编辑:我已经将其扩展为检测包含安装信息的注册表的任意子项,以便正确检测v4客户端和完整配置文件。同样,RegistryKey类型是IDisposable,看起来Dispose方法确实在做某事(注册表项解锁)。

var versionList = new List<string>();
using(var ndpKey=Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP")) {
    Action<RegistryKey, Action<RegistryKey,string>> processKids = (node, action) => {
        foreach(var childname in node.GetSubKeyNames())
            using(var child = node.OpenSubKey(childname))
                action(child,childname);
    };

    Action<RegistryKey, Func<RegistryKey, bool>> visitDescendants = null;
    visitDescendants = (regkey, isDone) => {
        if(!isDone(regkey))
            processKids(regkey, (subkey, subkeyname)=>visitDescendants(subkey,isDone));
    };

    processKids(ndpKey, (versionKey, versionKeyName) => {
        if(Regex.IsMatch(versionKeyName,@"^v\d")) {
            visitDescendants(versionKey, key => {
                bool isInstallationNode = Equals(key.GetValue("Install"), 1) && key.GetValue("Version") != null;
                if(isInstallationNode)
                    versionList.Add(
                        key.Name.Substring(ndpKey.Name.Length+1)
                        + (key.GetValue("SP")!=null ? ", service pack "+ key.GetValue("SP"):"")
                        + " ("+key.GetValue("Version")  +") "
                    );
                return isInstallationNode;
            });
        }
    });
}


然后,versionList包含:

v2.0.50727, service pack 2 (2.0.50727.4927)
v3.0, service pack 2 (3.0.30729.4926)
v3.5, service pack 1 (3.5.30729.4926)
v4\Client (4.0.30319)
v4\Full (4.0.30319)

10-08 12:33
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