C# Type.GetDefaultMembers()用法及代碼示例

Type.GetDefaultMembers()方法用於查找為設置了DefaultMemberAttribute的當前Type定義的成員。

用法： public virtual System.Reflection.MemberInfo[] GetDefaultMembers ();

返回值：如果當前Type沒有默認成員，則此方法返回代表當前Type的所有默認成員的MemberInfo對象的數組，或者返回MemberInfo類型的空數組。

以下示例程序旨在說明Type.GetDefaultMembers()方法的使用：

示例1:

// C# program to demonstrate the 
// Type.GetDefaultMembers() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing obj 
        object obj = "Ram"; 
  
        // Getting the type of obj 
        // using GetType() Method 
        Type type = obj.GetType(); 
  
        // Getting the DefaultMembers 
        // using GetDefaultMembers() Method 
        MemberInfo[] info = type.GetDefaultMembers(); 
  
        // Display the result 
        for (int i = 0; i < info.Length; i++) 
  
            Console.WriteLine("Result is:  {0}", info[i]); 
    } 
}

輸出：

Result is:  Char Chars [Int32]

示例2:

// C# program to demonstrate the 
// Type.GetDefaultMembers() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
// Setting DefaultMemberAttribute 
[DefaultMemberAttribute("name")] class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing 
        // object of Type dataType 
        Type type = typeof(GFG); 
  
        // Getting the DefaultMembers 
        // using GetDefaultMembers() Method 
        MemberInfo[] info = type.GetDefaultMembers(); 
  
        if (info.Length != 0) 
        { 
            for (int i = 0; i < info.Length; i++) 
                Console.WriteLine("Result is:  {0}", info[i]); 
        } 
        else { 
            Console.WriteLine("DefaultMember is not found"); 
        } 
    } 
  
    // Defining Member Attributes 
    public void Name(String s) {} 
  
    // Defining property 
    public String name 
    { 
        // property or indexer must  
        // have at least one accessor 
        get
        { 
            return "Ram"; 
        } 
    } 
}

輸出：

Result is:  System.String name

參考：

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

相關用法

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.GetDefaultMembers() 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。