FullName Property

Type.FullName Property

 

Gets the fully qualified name of the type, including its namespace but not its assembly.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public abstract string FullName { get; }

Property Value

Type: System.String

The fully qualified name of the type, including its namespace but not its assembly; or null if the current instance represents a generic type parameter, an array type, pointer type, or byref type based on a type parameter, or a generic type that is not a generic type definition but contains unresolved type parameters.

Implements

_Type.FullName

For example, the fully qualified name of the String type is System.String. Contrast this with the assembly-qualified name returned by the AssemblyQualifiedName property, which consists of the full name plus the full assembly name.

If the current type represents a closed generic type, the type arguments in the string returned by the FullNameproperty are qualified by their full assembly name, even though the string representation of the generic type itself is not qualified by its full assembly name. The following example illustrates the difference in the FullName property for a type that represents generic type definition and one that represents a closed generic type.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      Type t = typeof(List<>);
      Console.WriteLine(t.FullName);
      Console.WriteLine();

      List<String> list = new List<String>();
      t = list.GetType();
      Console.WriteLine(t.FullName);
   }
}
// The example displays the following output:
// System.Collections.Generic.List`1
//
// System.Collections.Generic.List`1[[System.String, mscorlib,
//        Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]

This property returns null if:

  • The current Type object represents a type parameter of a generic type.

    The following example retrieves the type parameter of the Nullable<T> type and attempts to display its FullName property.

    using System;
    using System.Reflection;
    
    public class Example
    {
       public static void Main()
       {
          Type t = typeof(Nullable<>); 
          Console.WriteLine(t.FullName);
          if (t.IsGenericType) {
             Console.Write("   Generic Type Parameters: ");
             Type[] gtArgs = t.GetGenericArguments();
             for (int ctr = 0; ctr < gtArgs.Length; ctr++) {
                Console.WriteLine(gtArgs[ctr].FullName ??
                                  "(unassigned) " + gtArgs[ctr].ToString());
              }
             Console.WriteLine();
          }
       }
    }
    // The example displays the following output:
    //       System.Nullable`1
    //          Generic Type Parameters: (unassigned) T
    
  • The current Type object represents an array type, a pointer type, or a byref type that is based on a generic type parameter.

    The following example defines a generic type, Generictype1<T>, with three methods: Display(T[]), which is passed an array of type T; HandleT(T), which is passed a T object; and ChangeValue(ref T), which is passed a T object by reference. Because C# and Visual Basic do not allow us to define T as a pointer in the HandleT method, we have to call the MakePointerType method on the Type object that represents the method's parameter type to create a pointer to a generic type. The output from the example shows that in all three cases, the FullName property is null.

    using System;
    using System.Reflection;
    
    public class GenericType1<T> 
    {
       public void Display(T[] elements)  
       {}
    
       public void HandleT(T obj)
       {}
    
       public bool ChangeValue(ref T arg) 
       {
          return true;
       }
    }
    
    public class Example
    {
       public static void Main()
       {
          Type t = typeof(GenericType1<>);
          Console.WriteLine("Type Name: {0}", t.FullName);
          MethodInfo[] methods = t.GetMethods(BindingFlags.Instance |
                                              BindingFlags.DeclaredOnly |
                                              BindingFlags.Public);
          foreach (var method in methods) { 
             Console.WriteLine("   Method: {0}", method.Name);
             // Get method parameters.
             ParameterInfo param = method.GetParameters()[0];
             Type paramType = param.ParameterType;
             if (method.Name == "HandleT")
                paramType = paramType.MakePointerType();
             Console.WriteLine("      Parameter: {0}", 
                               paramType.FullName ?? 
                               paramType.ToString() + " (unassigned)");
          }
       }
    }
    // The example displays the following output:
    //       Type Name: GenericType1`1
    //          Method: Display
    //             Parameter: T[] (unassigned))
    //          Method: HandleT
    //             Parameter: T* (unassigned)
    //          Method: ChangeValue
    //             Parameter: T& (unassigned)
    
  • The current type contains generic type parameters that have not been replaced by specific types (that is, the ContainsGenericParameters property returns true), but the type is not a generic type definition (that is, the IsGenericTypeDefinition property returns false

    In the following example, Derived<T> inherits from Base<T>. The BaseType property obtains the Type object that represents the base type of Derived<T>, and its FullName property returns null.

    using System;
    using System.Reflection;
    
    public class Base<T> { }
    
    public class Derived<T> : Base<T> { }
    
    public class Example
    {
       public static void Main()
       {
          Type t = typeof(Derived<>);
          Console.WriteLine("Generic Class: {0}", t.FullName);
          Console.WriteLine("   Contains Generic Paramters: {0}",
                            t.ContainsGenericParameters);
          Console.WriteLine("   Generic Type Definition: {0}\n",
                            t.IsGenericTypeDefinition);                 
    
          Type baseType = t.BaseType;
          Console.WriteLine("Its Base Class: {0}", 
                            baseType.FullName ?? 
                            "(unassigned) " + baseType.ToString());
          Console.WriteLine("   Contains Generic Paramters: {0}",
                            baseType.ContainsGenericParameters);
          Console.WriteLine("   Generic Type Definition: {0}",
                            baseType.IsGenericTypeDefinition);                 
          Console.WriteLine("   Full Name: {0}\n", 
                            baseType.GetGenericTypeDefinition().FullName);
    
          t = typeof(Base<>);
          Console.WriteLine("Generic Class: {0}", t.FullName);
          Console.WriteLine("   Contains Generic Paramters: {0}",
                            t.ContainsGenericParameters);
          Console.WriteLine("   Generic Type Definition: {0}\n",
                            t.IsGenericTypeDefinition);                 
    
    
       }
    }
    // The example displays the following output:
    //       Generic Class: Derived`1
    //          Contains Generic Paramters: True
    //          Generic Type Definition: True
    //       
    //       Its Base Class: (unassigned) Base`1[T]
    //          Contains Generic Paramters: True
    //          Generic Type Definition: False
    //          Full Name: Base`1
    //       
    //       Generic Class: Base`1
    //          Contains Generic Paramters: True
    //          Generic Type Definition: True
    

    To get a FullName that is not null, you can use the GetGenericTypeDefinition method to get the generic type definition, as the example illustrates.

This property is read-only.

The following example displays the full name of the specified type.

using System;
class TestFullName 
{
public static void Main() 
    {
    Type t = typeof(Array);
    Console.WriteLine("The full name of the Array type is {0}.", t.FullName);
    }
} 

/* This example produces the following output:

The full name of the Array type is System.Array.
 */

The following example compares the strings returned by the ToString method and the Name, FullName, and AssemblyQualifiedName properties.

using System;
using System.Collections.Generic;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      Type t = typeof(String);
      ShowTypeInfo(t);

      t = typeof(System.Collections.Generic.List<>);
      ShowTypeInfo(t);

      var list = new List<String>();
      t = list.GetType();
      ShowTypeInfo(t);

      Object v = 12;
      t = v.GetType();
      ShowTypeInfo(t);

      t = typeof(IFormatProvider);
      ShowTypeInfo(t);

      IFormatProvider ifmt = NumberFormatInfo.CurrentInfo;
      t = ifmt.GetType();
      ShowTypeInfo(t);
   }

   private static void ShowTypeInfo(Type t)
   {
      Console.WriteLine("Name: {0}", t.Name);
      Console.WriteLine("Full Name: {0}", t.FullName);
      Console.WriteLine("ToString:  {0}", t.ToString());
      Console.WriteLine("Assembly Qualified Name: {0}",
                        t.AssemblyQualifiedName);
      Console.WriteLine();
   }
}
// The example displays output like the following:
//    Name: String
//    Full Name: System.String
//    ToString:  System.String
//    Assembly Qualified Name: System.String, mscorlib, Version=4.0.0.0, Culture=neutr
//    al, PublicKeyToken=b77a5c561934e089
//
//    Name: List`1
//    Full Name: System.Collections.Generic.List`1
//    ToString:  System.Collections.Generic.List`1[T]
//    Assembly Qualified Name: System.Collections.Generic.List`1, mscorlib, Version=4.
//    0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
//
//    Name: List`1
//    Full Name: System.Collections.Generic.List`1[[System.String, mscorlib, Version=4
//    .0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]
//    ToString:  System.Collections.Generic.List`1[System.String]
//    Assembly Qualified Name: System.Collections.Generic.List`1[[System.String, mscor
//    lib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorl
//    ib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
//
//    Name: Int32
//    Full Name: System.Int32
//    ToString:  System.Int32
//    Assembly Qualified Name: System.Int32, mscorlib, Version=4.0.0.0, Culture=neutra
//    l, PublicKeyToken=b77a5c561934e089
//
//    Name: IFormatProvider
//    Full Name: System.IFormatProvider
//    ToString:  System.IFormatProvider
//    Assembly Qualified Name: System.IFormatProvider, mscorlib, Version=4.0.0.0, Cult
//    ure=neutral, PublicKeyToken=b77a5c561934e089
//
//    Name: NumberFormatInfo
//    Full Name: System.Globalization.NumberFormatInfo
//    ToString:  System.Globalization.NumberFormatInfo
//    Assembly Qualified Name: System.Globalization.NumberFormatInfo, mscorlib, Versio
//    n=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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