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C# Type.GetMember()用法及代碼示例


Type.GetMember()方法用於獲取當前Type的指定成員。此方法的重載列表中有3種方法，如下所示：

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

GetMember(String) Method

此方法搜索具有指定名稱的公共成員。


用法： public System.Reflection.MemberInfo[] GetMember (string name);

Here, it takes the string containing the name of the public members to get.

返回值：此方法返回一個MemberInfo對象數組，該數組代表具有指定名稱的公共成員，如果找不到，則為空數組。

異常：如果name為null，則此方法引發ArgumentNullException。

以下示例程序旨在說明上述方法的用法：

示例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; 
}
輸出： 
Members of current type is as Follow: 
 System.String Name

示例2:對於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; 
}
輸出： 
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, BindingFlags) Method

此方法用於使用指定的綁定約束來搜索指定的成員。

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

參數：
name：它是包含要獲取的成員名稱的字符串。
bindingAttr：這是一個由一個或多個BindingFlags組成的位掩碼，用於指定如何進行搜索。或零，返回一個空數組。

返回值：如果發現否則，此方法返回一個MemberInfo對象數組，該數組代表具有指定名稱的公共成員，否則為空數組。

異常：如果name為null，則此方法將引發ArgumentNullException。

以下示例程序旨在說明上述方法的用法：

示例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; 
}
輸出： 
Members of current type is as Follow: 
 System.String Name

示例2:對於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; 
}
輸出： 
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, MemberTypes, BindingFlags) Method

此方法用於使用指定的綁定約束來搜索指定成員類型的指定成員。

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

參數：
name：它是包含要獲取的成員名稱的字符串。
type：這是要搜索的值。
bindingAttr：這是一個位掩碼，由一個或多個BindingFlags組成，它們指定如何進行搜索，或者指定為零以返回空數組。

返回值：如果發現否則，此方法返回一個MemberInfo對象數組，該數組代表具有指定名稱的公共成員，否則為空數組。

異常：如果名稱為null，則此方法引發ArgumentNullException。

以下示例程序旨在說明上述方法的用法：

示例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() {} 
}
輸出： 
Members of current type is as Follow: 
 Void returnNull()

示例2:對於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() {} 
}
輸出： 
name is null.
Exception Thrown: System.ArgumentNullException

參考：



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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 C# | Type.GetMember() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。