C# | Type.GetMember() Method

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:

• https://docs.microsoft.com/en-us/dotnet/api/system.type.getmember?view=netframework-4.8