System.IO.FileNotFoundException：无法加载文件或程序集。 系统找不到文件SharpSvn.dll

Question

I'm trying to do a web page where you can browse through folders. i have done this in separate solution and it all works, but when i tried to integrate it in solution with more then one project who are also referencing PostSharp I get this error:

 Unhandled exception (2.1.7.1, 32 bit, CLR 4.0, Release): System.IO.FileNotFoundException: Could not load file or assembly 'file:///C:\_projects\...\Libraries\SharpSvn\SharpSvn.dll' or one of its dependencies. The system cannot find the file specified.
    File name: 'file:///C:\_projects\...\Libraries\SharpSvn\SharpSvn.dll'

       at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
       at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
       at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks)
       at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
       at System.Reflection.Assembly.ReflectionOnlyLoadFrom(String assemblyFile)
       at PostSharp.Sdk.CodeModel.ModuleDeclaration.GetSystemModule()
       at PostSharp.Sdk.CodeModel.Domain.LoadAssembly(Assembly reflectionAssembly, Boolean lazyLoading)
       at PostSharp.Sdk.CodeModel.Domain.GetAssembly(IAssemblyName assemblyName, BindingOptions bindingOptions)
       at PostSharp.Sdk.CodeModel.AssemblyRefDeclaration.GetAssemblyEnvelope()
       at PostSharp.Sdk.Extensibility.Tasks.MulticastAttributeTask.^SgrhoGlQ(AssemblyRefDeclaration _0)
       at PostSharp.Sdk.Extensibility.Tasks.MulticastAttributeTask.^+GwnKh4ZYHu3()
       at PostSharp.Sdk.Extensibility.Tasks.MulticastAttributeTask.Execute()
       at PostSharp.Sdk.Extensibility.Project.ExecutePhase(String phase)
       at PostSharp.Sdk.Extensibility.Project.Execute()
       at PostSharp.Hosting.PostSharpObject.ExecuteProjects()
       at PostSharp.Hosting.PostSharpObject.InvokeProject(ProjectInvocation projectInvocation)

    WRN: Assembly binding logging is turned OFF.
    To enable assembly bind failure logging, set the registry value         [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
    Note: There is some performance penalty associated with assembly bind failure logging.
    To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

Answer 1

It's possible that the SharpSVN assembly is failing to load because it references a couple of native DLLs ( SharpSvn-DB44-20-win32.dll and SharpSvn-Sasl21-23-win32.dll for the 32-bit version). If those aren't somewhere in the system search path - which is generally the case for ASP.NET - then SharpSVN will probably fail to load.

I had a similar problem with one of my NuGet packages not working on MVC websites because the native DLLs were not loading. Putting them in the bin folder of the website was not sufficient, because the bin folder is neither on the search path nor is it the application folder.

Try adding the following method to your application class in Global.asax.cs file and call it from Application_Start() :

public static void CheckAddBinPath()
{
    // find path to 'bin' folder
    var binPath = Path.Combine(new string[] { AppDomain.CurrentDomain.BaseDirectory, "bin" });
    // get current search path from environment
    var path = Environment.GetEnvironmentVariable("PATH") ?? "";

    // add 'bin' folder to search path if not already present
    if (!path.Split(Path.PathSeparator).Contains(binPath, StringComparer.CurrentCultureIgnoreCase))
    {
        path = string.Join(Path.PathSeparator.ToString(), new string[] { path, binPath });
        Environment.SetEnvironmentVariable("PATH", path);
    }
}

This will add your bin folder to the system search path for your application only, which should allow SharpSvn to locate the native DLLs it relies on. Just make sure that the files are actually there - you might have to copy them from the SharpSvn distribution if they're not.

Of course I could be completely off the mark. Let me know either way.

Answer 2

I wrote: "when i comment this method the error is gone: static void SVN_SSL_Override(object sender, SharpSvn.Security.SvnSslServerTrustEventArgs e) { e.AcceptedFailures = e.Failures; e.Save = true; } "

don't know why but there was the problem so i removed:

client.Authentication.Clear(); client.Authentication.SslServerTrustHandlers += new EventHandler(SVN_SSL_Override); client.Authentication.DefaultCredentials = new NetworkCredential(" ", " ");

and this method

static void SVN_SSL_Override(object sender, SharpSvn.Security.SvnSslServerTrustEventArgs e) { e.AcceptedFailures = e.Failures; e.Save = true; } "

and just added:

client.Authentication.UserNamePasswordHandlers += delegate(object obj, SharpSvn.Security.SvnUserNamePasswordEventArgs args) { args.UserName = " "; args.Password = " "; args.Save = true; };

and now it works.