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C# | Type.GetMember() Method

  • Last Updated : 05 Dec, 2019

Type.GetMember() Method is used to get the specified members of the current Type. There are 3 methods in the overload list of this method as follows:

  • GetMember(String) Method
  • GetMember(String, BindingFlags) Method
  • GetMember(String, MemberTypes, BindingFlags) Method

GetMember(String) Method

This method searches for the public members with the specified name.

Syntax: public System.Reflection.MemberInfo[] GetMember (string name);
Here, it takes the string containing the name of the public members to get.

Return Value: This method returns an array of MemberInfo objects representing the public members with the specified name, if found otherwise, an empty array.



Exception: This method throws ArgumentNullException if name is null.

Below programs illustrate the use of the above-discussed method:

Example 1:




// C# program to demonstrate the
// Type.GetMember(String) Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember("Name");
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.Write("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student 
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
}
Output:
Members of current type is as Follow: 
 System.String Name

Example 2: For ArgumentNullException




// C# program to demonstrate the
// Type.GetMember(String) Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember(null);
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.WriteLine("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student 
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
}
Output:
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, BindingFlags) Method

This method is used to search for the specified members, using the specified binding constraints.

Syntax: public virtual System.Reflection.MemberInfo[] GetMember (string name, System.Reflection.BindingFlags bindingAttr);



Parameters:
name: It is the string containing the name of the members to get.
bindingAttr: It is a bitmask comprised of one or more BindingFlags that specify how the search is conducted. or, Zero, to return an empty array.

Return Value: This method returns an array of MemberInfo objects representing the public members with the specified name if found otherwise, an empty array.

Exception: This method throws ArgumentNullException if name is null.

Below programs illustrate the use of the above-discussed method:

Example 1:




// C# program to demonstrate the
// Type.GetMember(String, BindingFlags) 
// Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember("Name",
                      BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.WriteLine("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
}
Output:
Members of current type is as Follow: 
 System.String Name

Example 2: For ArgumentNullException




// C# program to demonstrate the
// Type.GetMember(String, BindingFlags) Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember(null,
                    BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e) 
        {
            Console.WriteLine("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
}
Output:
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, MemberTypes, BindingFlags) Method

This method is used to search for the specified members of the specified member type, using the specified binding constraints.

Syntax: public virtual System.Reflection.MemberInfo[] GetMember (string name, System.Reflection.MemberTypes type, System.Reflection.BindingFlags bindingAttr);



Parameters:
name: It is the string containing the name of the members to get.
type: It is the value to search for.
bindingAttr: It is a bitmask comprised of one or more BindingFlags that specify how the search is conducted or, Zero, to return an empty array.

Return Value: This method returns an array of MemberInfo objects representing the public members with the specified name if found otherwise, an empty array.

Exception: This method throw ArgumentNullException if the name is null.

Below programs illustrate the use of the above-discussed method:

Example 1:




// C# program to demonstrate the
// Type.GetMember(String, MemberTypes,
// BindingFlags) Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember("returnNull", MemberTypes.Method,
                                      BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.WriteLine("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student 
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
  
    public void returnNull() {}
}
Output:
Members of current type is as Follow: 
 Void returnNull()

Example 2: For ArgumentNullException




// C# program to demonstrate the
// Type.GetMember(String, MemberTypes,
// BindingFlags) Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            MemberInfo[] info = objType.GetMember(null, MemberTypes.Method,
                              BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Members of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e) 
        {
            Console.WriteLine("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
  
// Defining class Student
public class Student
{
    public string Name = "Rahul";
    public string Dept = "Electrical";
    public int Roll = 10;
    public static int id = 02;
  
    public void returnNull() {}
}
Output:
name is null.
Exception Thrown: System.ArgumentNullException

Reference:




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