Detect if the type of an object is a type defined by .NET Framework

Question

How can I determine by reflection if the type of an object is defined by a class in my own assembly or by the .NET Framework?

I dont want to supply the name of my ow

Answer 1

Based on Jon's answer and Mehrdad's comment, it appears that the following three values are used for the public key token (from AssemblyName.FullName) for the .NET Framework provided assemblies from .NET 2.0 and later:

PublicKeyToken=b77a5c561934e089

• mscorlib
• System.Data
• System.Data.OracleClient
• System.Data.SqlXml
• System
• System.Runtime.Remoting
• System.Transactions
• System.Windows.Forms
• System.Xml
• SMDiagnostics
• System.Runtime.Serialization
• System.ServiceModel
• System.ServiceModel.Install
• System.ServiceModel.WasHosting

PublicKeyToken=b03f5f7f11d50a3a

• Accessibility
• AspNetMMCExt
• cscompmgd
• CustomMarshalers
• IEExecRemote
• IEHost
• IIEHost
• ISymWrapper
• Microsoft.Build.Conversion
• Microsoft.Build.Engine
• Microsoft.Build.Framework
• Microsoft.Build.Tasks
• Microsoft.Build.Utilities
• Microsoft.JScript
• Microsoft.VisualBasic.Compatibility.Data
• Microsoft.VisualBasic.Compatibility
• Microsoft.VisualBasic
• Microsoft.VisualBasic.Vsa
• Microsoft.VisualC
• Microsoft.Vsa
• Microsoft.Vsa.Vb.CodeDOMProcessor
• Microsoft_VsaVb
• sysglobl
• System.Configuration
• System.Configuration.Install
• System.Deployment
• System.Design
• System.DirectoryServices
• System.DirectoryServices.Protocols
• System.Drawing.Design
• System.Drawing
• System.EnterpriseServices
• System.Management
• System.Messaging
• System.Runtime.Serialization.Formatters.Soap
• System.Security
• System.ServiceProcess
• System.Web
• System.Web.Mobile
• System.Web.RegularExpressions
• System.Web.Services
• Microsoft.Transactions.Bridge
• Microsoft.Transactions.Bridge.Dtc
• Microsoft.Build.Tasks.v3.5
• Microsoft.CompactFramework.Build.Tasks
• Microsoft.Data.Entity.Build.Tasks
• Microsoft.VisualC.STLCLR
• Sentinel.v3.5Client

PublicKeyToken=31bf3856ad364e35

• PresentationCFFRasterizer
• PresentationUI

This was generated from the following code:

    private void PrintAssemblyInfo(string fullName)
    {
        string[] parts = fullName.Split(',');
        Console.WriteLine(" - {0}, {1}", parts[0], parts[3]);
    }

    private void GenerateInfo(string path)
    {
        foreach (var file in Directory.GetFiles(path, 
           "*.dll",
           SearchOption.AllDirectories))
        {
            try
            {
                Assembly assembly = Assembly.ReflectionOnlyLoadFrom(file);
                PrintAssemblyInfo(assembly.GetName().FullName);
            }
            catch { }
        }
    }

    private void GenerateInfo()
    {
        GenerateInfo(@"C:\Windows\Microsoft.NET\Framework\v2.0.50727");
        GenerateInfo(@"C:\Windows\Microsoft.NET\Framework\v3.0");
        GenerateInfo(@"C:\Windows\Microsoft.NET\Framework\v3.5");
    }