如何以字符串格式保存类型

Question

How do I save a Type in string format?

public class cat
{
    public int i = 1;
    public func ()
    {
        Console.WriteLine("I am a cat");
    }

}

// ...

Type obj_type = typeof(cat);
string arg2;

arg2 = obj_type.ToString(); /* error*/
arg2 = (string)obj_type;/*same error*/
arg2 = obj_type.Name; /*same error*/

Console.WriteLine(obj_type); /*ok*/ " temp.cat "

I receive this error at the line above:

Cannot implicitly convert type 'string' to 'System.Type'

Answer 1

如果需要完全限定的类型名称，请尝试以下操作：

arg2 = obj_type.AssemblyQualifiedName;

Answer 2

You can get type of instantiated object:

string typeName = obj.GetType().Name;

MSDN reference to GetType method: https://msdn.microsoft.com/en-us/library/system.object.gettype(v=vs.110).aspx

And in case you want to get Type name just by Class:

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();
}

Answer 3

This works fine, just checked it :

Type obj_type = typeof(cat);
string arg2 = obj_type.ToString();
// arg2 = obj_type.Name; it works too and it gives short name without namespaces
Console.WriteLine(arg2);

Output: Test1.cat // fully qualified name

PS

arg2 = (string)obj_type;

Here you try to explicitly cast Type to string. It's like you say "Hey i am 100% sure that Type can be converted to string easily so just do it". It's not working because there is no simple conversion between them and compiler doesn't know how to handle it.

Answer 4

typeof accept a Type not its instance.

See This.

public class cat
{
    public int i = 1;
    public void func()
    {
        Console.WriteLine("I am a cat");
    }
}

Type type = typeof(cat);// typeof accept a Type not its instance
string typeName = type.Name;// cat