I'm trying to check what framework version a other .NET application is working with through a assembly. I found two ways to get the version of the framework ( first through the ImageRunetimeVersion and with the FullName of the assembly ) but i'm getting two different values from it and i dont know which is the right one:
Assembly ass = Assembly.LoadFrom(autPath);
string imageRuntimeVersion = ass.ImageRuntimeVersion;
Console.WriteLine("ImageRunetimeVersion: " + imageRuntimeVersion);
Console.WriteLine("FullName: " + ass.FullName);
Console.WriteLine("");
Console.WriteLine("----");
Console.WriteLine("Referenced Assemblies: ");
Console.WriteLine("");
AssemblyName[] referencedAssemblies = ass.GetReferencedAssemblies();
foreach (AssemblyName a in referencedAssemblies)
{
Console.WriteLine(a.FullName);
}
if i'm going to test this with my application and of e.g paint.net the results are:
Like you can see i cant say which "version" is the right one. The biggest problem is that if i'm going to take a look to my project properties for my .net application the target platform is 3.5 and not 2.0 or 1.0-
I think I can clear some things up for you. First, the FullName property gives you the application version number. That is the number you set and has no relation to the .NET framework version. That means the version number in the FullName property can be ignored.
The imageRuntimeVersion is the CLR version. Unfortunately, 2.0 covers .NET 2.0, 3.0, and 3.5. Technically, your application is giving you the right information but it isn't really the information you want (I don't think).
Here is a SO article with more explanation:
Retrieve Target Framework Version and Target Framework Profile from a .Net Assembly
A couple of suggestions for you from that article include looking for a config file that would give you the targetted framework or looking at the versions of the libraries that are used. Neither is really foolproof but as far as I know, that is the best you can do.
TargetFramework not same CLR version.
For example,
CLR 4.0
TargetFramework: .NET 4.0 and .NET 4.5
A solution using TargetFrameworkAttribute http://www.lucbos.net/2011/08/get-targetframework-for-assembly.html
Note: TargetFrameworkAttribute is only available from .NET 4.0.
var targetFramework = "Unknown";
var targetFrameworkAttributes = assembly.GetCustomAttributes(typeof(System.Runtime.Versioning.TargetFrameworkAttribute), true);
if (targetFrameworkAttributes.Length > 0)
{
var targetFrameworkAttribute = (TargetFrameworkAttribute)targetFrameworkAttributes.First();
targetFramework = (targetFrameworkAttribute.FrameworkDisplayName);
}
Console.WriteLine("Version: {0}", Environment.Version.ToString());
Related
From the command line (or by any means really), how can I determine which CLR version a .NET assembly requires?
I need to determine if an assembly requires 2.0 or 4.0 CLR version.
ildasm.exe will show it if you double-click on "MANIFEST" and look for "Metadata version". By default, it's the version that the image was compiled against.
One clarification...
The problem with all the mentioned methods is that they will return version 4.0 if assembly was compiled against .NET framework 4.0, 4.5 or 4.5.1.
The way to figure out this version programmatically at runtime is using the System.Runtime.Versioning.TargetFrameworkAttribute for the given assembly, for example
using System;
using System.Linq;
using System.Reflection;
using System.Runtime.Versioning;
...
object[] list = Assembly.GetExecutingAssembly().GetCustomAttributes(true);
var attribute = list.OfType<TargetFrameworkAttribute>().First();
Console.WriteLine(attribute.FrameworkName);
Console.WriteLine(attribute.FrameworkDisplayName);
Will return
a.FrameworkName ".NETFramework,Version=v4.0" string
a.FrameworkDisplayName ".NET Framework 4" string
a.FrameworkName ".NETFramework,Version=v4.5" string
a.FrameworkDisplayName ".NET Framework 4.5" string
a.FrameworkName ".NETFramework,Version=v4.5.1" string
a.FrameworkDisplayName ".NET Framework 4.5.1" string
class Program {
static void Main(string[] args) {
System.Console.WriteLine(
System.Reflection.Assembly.LoadFrom(args[0]).ImageRuntimeVersion);
}
}
Compile and run the above application under the latest .NET Framework (as an older CLR may be unable to load assemblies requiring a newer CLR) and run it passing the path to the assembly you want to check as the command line argument.
Here's a PowerShell equivalent of the .NET code suggested in another answer. Using PowerShell means that you can skip a few steps like creating and compiling an assembly.
At a PowerShell prompt, run the following:
[System.Reflection.Assembly]::LoadFrom("C:\...\MyAssembly.dll").ImageRuntimeVersion
By default, PowerShell uses the .NET v2 runtime, so you'll get an exception for assemblies targetting v4. Stack Overflow question How can I run PowerShell with the .NET 4 runtime? details methods for changing that, if required.
Here is a powershell one liner that will display the Target framework version for assemblies targeting v4 and up.
Resolve-Path($args) | Select #{N='Assembly'; E={$_ }}, #{N='TargetFramework'; E={(([Reflection.Assembly]::ReflectionOnlyLoadFrom($_).GetCustomAttributesData() | Where-Object { $_.AttributeType -like "System.Runtime.Versioning.TargetFrameworkAttribute" })).NamedArguments.TypedValue}} | Format-Table
use:
C:\test\> show-targetfw.ps1 *.dll
Assembly TargetFramework
-------- --------
C:\test\a.dll ".NET Framework 4.6.1"
C:\test\b.dll ".NET Framework 4.5.2"
From command line
DUMPBIN your dll/exe /CLRHEADER
I'd suggest using ReflectionOnlyLoadFrom() insted of LoadFrom()
It has an advantage that it can load x64 and ia64 assemblies when running on x86 machine, while LoadFrom() will fail to do that.
Though it still won't load .Net 4.0 assemblies from a 2.0 powershell.
As #mistika suggested, it is better to use ReflectionOnlyLoadFrom() rather than LoadFrom(). The downside of this is that calling GetCustomAttributes() on an assembly loaded with ReflectionOnlyLoadFrom() throws an exception. You need to call GetCustomAttributesData() instead:
var assembly = Assembly.ReflectionOnlyLoadFrom(assemblyPath);
var customAttributes = assembly.GetCustomAttributesData();
var targetFramework = customAttributes.FirstOrDefault(attr => attr.AttributeType.Equals(typeof(TargetFrameworkAttribute)));
var frameworkName = string.Empty;
var frameworkDisplayName = string.Empty;
if (null != targetFramework)
{
if(targetFramework.ConstructorArguments.Any())
{
// first argument is the name of the framework.
frameworkName = (string)targetFramework.ConstructorArguments[0].Value;
}
// search for a named argument called "FrameworkDisplayName"
var frameworkDisplayNameArg = targetFramework.NamedArguments.FirstOrDefault(arg => arg.MemberName.Equals("FrameworkDisplayName"));
if (null != frameworkDisplayNameArg)
{
frameworkDisplayName = (string)frameworkDisplayNameArg.TypedValue.Value;
}
}
Console.WriteLine("Framework Name: " + frameworkName);
Console.WriteLine("Framework Display Name: " + frameworkDisplayName);
I use ILSpy as a replacement for Reflector. If you open the assembly in ILSpy, you can see, for example:
[assembly: TargetFramework(".NETFramework,Version=v4.6.2", FrameworkDisplayName = ".NET Framework 4.6.2")]
A very nice tool is JustDecompile from Telerik. You can open assemblies and the tool is showing whether they are targeting 4.5, 4.5.1 or 4.6
If you want to include result in a script, I recommend using the text output of ildasm.exe, and then grep "Version String" from the output.
"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\ildasm.exe" /text D:\LocalAssemblies\Toolfactory.Core.BaseTypes.dll /noil /headers | find "' Version String"
Note I include a ' so the find command does not recognize "Version String Length"
Try this Assembly Information executable to get the assembly version, which tells you CLR version it requires, and as well other information
such as Compilation options, Target Processor and References:
Iget the following error:
The name 'HttpUtility' does not exist in the current context
I am building a winform app this my code using framework 4 client profile
and I can't find the System.Web reference:
string longurl = "https://test.com/currentaccount/Pages/current.aspx";
var uriBuilder = new UriBuilder(longurl);
var query = HttpUtility.ParseQueryString(uriBuilder.Query);//error
query["ltFrom"] = FromDate;
query["ltTo"] = ToDate;
query["ltFilterSelected"] = "none";
uriBuilder.Query = query.ToString();
longurl = uriBuilder.ToString();
What is the problem?
HttpUtility cannot be accepted with ClientProfile - change your .Net version to full.
The project is set on Target Framework to: .net 4 client profile.
That's the problem. HttpUtility doesn't exist in the client profile. Target the full profile instead (and make sure you have a reference to System.Web.dll).
Compare the "Version information" line from the above documentation:
.NET Framework
Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
with that of (say) System.String:
.
NET Framework
Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Portable Class Library
Supported in: Portable Class Library
.NET for Windows Store apps
Supported in: Windows 8
ref: Im getting error on visual studio 2010: The type or namespace name 'HttpUtility' does not exist
to use "HttpUtility" simply add reference in visual studio from option Project->Add Reference->click on system.web then ok.
HttpUtility is based in System.Web, the Client Profile for .NET 4 only allows access to a subset of the .NET framework and System.Web is not included in that.
If you can, change from Client Profile to Full unless you have a really good reason to stick with Client Profile in which case you will need to find a different approach.
How do I get the running dot net version of my asp.net application.
I tried the solution from here
Is there an easy way to check the .NET Framework version?
It gives the highest version installed but I need the running version.
Use Environment.Version for getting the run time version. It will give the version number of .Net CLR which is being used for executing current application.
You need to be careful here, it will only return run time version not framework version. The CLR for .NET 3.0 and .NET 3.5 is the same CLR from .NET 2.0.
Use Environment.Version - it gives you the exact version of .NET running the application.
Hope this one helps,
DirectoryEntry site = new DirectoryEntry(#"IIS://localhost/w3svc/1/Root");
PropertyValueCollection values = site.Properties["ScriptMaps"];
foreach (string val in values)
{
if (val.StartsWith(".aspx"))
{
string version = val.Substring(val.IndexOf("Framework") + 10, 9);
MessageBox.Show(String.Format("ASP.Net Version is {0}", version));
}
}
The script map property is an array of strings. If the app supports asp.net one of those strings will be a mapping of the aspx file extension to the asp.net handler which will a the full path to a DLL. The path will be something like
%windir%/Microsoft.NET/Framework//aspnet_isapi.dll.
You can get the version out of this string with some simple parsing.
Here's a concrete example of what I want to do.
Consider the string.Join function. Pre-.NET 4.0, there were only two overloads, both of which required a string[] parameter.
As of .NET 4.0, there are new overloads taking more flexible parameter types, including IEnumerable<string>.
I have a library which includes a Join function that does essentially what the .NET 4.0 string.Join function does. I was just wondering if I could make this function's implementation dependent on the .NET framework being targeted. If 4.0, it could simply call string.Join internally. If 3.5 or older, it could call its own internal implementation.
Does this idea make sense?
If it does make sense, what's the most logical way to do it? I guess I'm just assuming a preprocessor directive would make the most sense, since a call to string.Join with an IEnumerable<string> parameter won't even compile when targeting a .NET version older than 4.0; so whatever approach I use would have to take place prior to compilation. (Checking the Environment.Version property at runtime, for example, wouldn't work.)
You can take a look at another question on Stack Overflow that illustrates how to set conditional constants through the project file's XML:
Detect target framework version at compile time
Then using that you can determine if you should use the .NET 4 overloads or your own library.
At some point (not sure when), Microsoft added predefined symbols for .NET versions into the MSBuild build system. Everything here works if you are using MSBuild from the .NET 5+ SDK (even if the project you are building with that SDK is using a much older target framework).
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/preprocessor-directives
Target Frameworks
Symbols
Additional symbols available in .NET 5+ SDK
.NET Framework
NETFRAMEWORK, NET48, NET472, NET471, NET47, NET462, NET461, NET46, NET452, NET451, NET45, NET40, NET35, NET20
NET48_OR_GREATER, NET472_OR_GREATER, NET471_OR_GREATER, NET47_OR_GREATER, NET462_OR_GREATER, NET461_OR_GREATER, NET46_OR_GREATER, NET452_OR_GREATER, NET451_OR_GREATER, NET45_OR_GREATER, NET40_OR_GREATER, NET35_OR_GREATER, NET20_OR_GREATER
.NET Standard
NETSTANDARD, NETSTANDARD2_1, NETSTANDARD2_0, NETSTANDARD1_6, NETSTANDARD1_5, NETSTANDARD1_4, NETSTANDARD1_3, NETSTANDARD1_2, NETSTANDARD1_1, NETSTANDARD1_0
NETSTANDARD2_1_OR_GREATER, NETSTANDARD2_0_OR_GREATER, NETSTANDARD1_6_OR_GREATER, NETSTANDARD1_5_OR_GREATER, NETSTANDARD1_4_OR_GREATER, NETSTANDARD1_3_OR_GREATER, NETSTANDARD1_2_OR_GREATER, NETSTANDARD1_1_OR_GREATER, NETSTANDARD1_0_OR_GREATER
.NET 5+ (and .NET Core)
NET, NET6_0, NET5_0, NETCOREAPP, NETCOREAPP3_1, NETCOREAPP3_0, NETCOREAPP2_2, NETCOREAPP2_1, NETCOREAPP2_0, NETCOREAPP1_1, NETCOREAPP1_0
NET6_0_OR_GREATER, NET5_0_OR_GREATER, NETCOREAPP3_1_OR_GREATER, NETCOREAPP3_0_OR_GREATER, NETCOREAPP2_2_OR_GREATER, NETCOREAPP2_1_OR_GREATER, NETCOREAPP2_0_OR_GREATER, NETCOREAPP1_1_OR_GREATER, NETCOREAPP1_0_OR_GREATER
This allows you to, for example, do this:
#if NET5_0_OR_GREATER
Console.WriteLine("This is .NET 5 or later.");
#elif NETCOREAPP
Console.WriteLine("This is an older version of .NET Core.");
#elif NETFRAMEWORK
Console.WriteLine("This is the legacy .NET Framework.");
#else
Console.WriteLine("This is something else.");
#endif
Yes, I think it makes sense (for your particular case, since the change is relatively minor), though obviously that sort of thing could scale out of control fairly quickly.
IMHO, the most logical way to go about it would be to create different solution/project configurations for each version, then define a custom symbol (say, NET40) in your 4.0 configurations, then use that with an #if. I'm not certain if configurations will allow you to change the runtime version (that would obviously be the perfect solution), but your worst-case is having to change the version manually.
EDIT: I just saw the answer linked to in Joshua's answer, and that seems like a more streamlined solution, but I'll leave this here anyway, since it does, strictly speaking, answer the question.
You can prepare your code for .NET 4.0 and write the similar code for the .NET 3.5 base on framework detection.
#if NOT_RUNNING_ON_4
public static class GuidExtensions
{
public static bool TryParse(this string s, out Guid result)
{
if (s.IsNullOrEmpty())
return null;
try
{
return new Guid(s);
}
catch (FormatException)
{
return null;
}
}
}
#else
#error switch parsing to .NET 4.0
#endif
And put his line to your *.csproj
<DefineConstants Condition=" '$(TargetFrameworkVersion)' != 'v4.0' ">NOT_RUNNING_ON_4</DefineConstants>
I'm trying to evaluate an expression stored in a database i.e.
"if (Q1 ==2) {result = 3.1;} elseif (Q1 ==3){result=4.1;} else result = 5.9;"
Rather than parsing it myself I'm trying to use the DLR. I'm using version .92 from the Codeplex repository and my solution is a .NET 3.5 website; and I'm having conflicts between the System.Core and Microsoft.Scripting.ExtenstionAttribute .dll's.
Error =
{
Description: "'ExtensionAttribute' is ambiguous in the namespace 'System.Runtime.CompilerServices'.",
File: "InternalXmlHelper.vb"
}
At this time I cannot upgrade to .NET 4.0 and make significant use of the .net 3.5 features (so downgrading is not an option).
Any help greatly appreciated.
The solution is to type forward ExtensionAttribte into System.Core.dll. We've made 3 different versions of this assembly (for the 3 different versions that we've shipped w/ various IronPython versions) and attached to them on this bug on IronPython's CodePlex site.
You'll need to download them and check the versions on them and replace the one that matches the version in the CodePlex release you're using.
I might be to complex thinking right now and more easy solutions exists, but this jumped into my mind as a possibility;
Have you considered building a runtime class using the CodeDom, instanciating one, executing a method on it (with the expression as its implementation, which is more like code-snippets than a pure expression) and then retrieving the 'result' value from that class instance via a public property?