[英]Determining .net framework version in a running application
(edited) Why does AssemblyName.Version report the same version even when I change the target version of my project? (已编辑)即使更改项目的目标版本,AssemblyName.Version为什么也报告相同的版本? How can I determine the actual executing version of the framework?
如何确定框架的实际执行版本?
This always returns 4.0.0.0 这总是返回4.0.0.0
foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
var aName = assembly.GetName();
Console.WriteLine($"{aName.Name} {aName.Version}" );
}
Official example from Microsoft to detect .NET Framework runtime version is as below, Microsoft用来检测.NET Framework运行时版本的官方示例如下,
https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed#net_d https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed#net_d
using System;
using Microsoft.Win32;
public class GetDotNetVersion
{
public static void Main()
{
GetDotNetVersion.Get45PlusFromRegistry();
}
private static void Get45PlusFromRegistry()
{
const string subkey = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\";
using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey))
{
if (ndpKey != null && ndpKey.GetValue("Release") != null) {
Console.WriteLine(".NET Framework Version: " + CheckFor45PlusVersion((int) ndpKey.GetValue("Release")));
}
else {
Console.WriteLine(".NET Framework Version 4.5 or later is not detected.");
}
}
}
// Checking the version using >= will enable forward compatibility.
private static string CheckFor45PlusVersion(int releaseKey)
{
if (releaseKey >= 461808)
return "4.7.2 or later";
if (releaseKey >= 461308)
return "4.7.1";
if (releaseKey >= 460798)
return "4.7";
if (releaseKey >= 394802)
return "4.6.2";
if (releaseKey >= 394254)
return "4.6.1";
if (releaseKey >= 393295)
return "4.6";
if (releaseKey >= 379893)
return "4.5.2";
if (releaseKey >= 378675)
return "4.5.1";
if (releaseKey >= 378389)
return "4.5";
// This code should never execute. A non-null release key should mean
// that 4.5 or later is installed.
return "No 4.5 or later version detected";
}
}
// This example displays output like the following:
// .NET Framework Version: 4.6.1
Update: Turn out the true issue is related to the default set of SSL/TLS protocols that's used by .NET Framework classes, where if your assemblies are compiled against a certain framework version at compile time would trigger different runtime behaviors. 更新:真正的问题与.NET Framework类使用的默认SSL / TLS协议集有关,如果您的程序集在编译时针对某个框架版本进行编译,则会触发不同的运行时行为。
The AppContext switch is <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSchUseStrongCrypto=true"/>
as documented in KB3069494, 如
<AppContextSwitchOverrides value="Switch.System.Net.DontEnableSchUseStrongCrypto=true"/>
中所述,AppContext开关为<AppContextSwitchOverrides value="Switch.System.Net.DontEnableSchUseStrongCrypto=true"/>
,
https://support.microsoft.com/en-us/help/3069494/cannot-connect-to-a-server-by-using-the-servicepointmanager-or-sslstre https://support.microsoft.com/en-us/help/3069494/cannot-connect-to-a-server-by-using-the-servicepointmanager-or-sslstre
You might also check the best practice article for more tips, 您也可以查看最佳做法文章,了解更多提示,
https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls?view=netframework-4.7.2 https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls?view=netframework-4.7.2
Try this: 尝试这个:
private static string GetExecutingAssemblyTargetFramework()
{
string result = string.Empty;
System.Reflection.Assembly asm = System.Reflection.Assembly.GetExecutingAssembly();
System.Runtime.Versioning.TargetFrameworkAttribute targetFrameworkAttribute = asm.GetCustomAttributes(
typeof(System.Runtime.Versioning.TargetFrameworkAttribute), false).FirstOrDefault()
as System.Runtime.Versioning.TargetFrameworkAttribute;
if (targetFrameworkAttribute != null)
result = targetFrameworkAttribute.FrameworkDisplayName;
return result;
}
You can also use the same loop from the original question: 您还可以使用与原始问题相同的循环:
foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
Console.WriteLine(GetAssemblyTargetFramework(assembly));
}
private static string GetAssemblyTargetFramework(System.Reflection.Assembly asm)
{
string result = string.Empty;
System.Runtime.Versioning.TargetFrameworkAttribute targetFrameworkAttribute = asm.GetCustomAttributes(
typeof(System.Runtime.Versioning.TargetFrameworkAttribute), false).FirstOrDefault()
as System.Runtime.Versioning.TargetFrameworkAttribute;
if (targetFrameworkAttribute != null)
result = targetFrameworkAttribute.FrameworkDisplayName;
return result;
}
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