C# Type.GetNestedTypes()用法及代碼示例

Type.GetNestedTypes()方法用於獲取嵌套在當前Type中的類型。此方法的重載列表中有2種方法，如下所示：

GetNestedTypes()方法
GetNestedTypes(BindingFlags)方法

GetNestedTypes() Method

此方法用於返回嵌套在當前Type中的公共類型。

用法： public Type[] GetNestedTypes ();

返回值：此方法返回一個Type對象數組，該數組表示嵌套在當前Type中的公共類型(搜索不是遞歸的)；如果當前類型中沒有嵌套的公共類型，則返回Type類型的空數組。

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.GetNestedTypes() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
// Defining class Empty 
public class Empty { } 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(Person); 
  
        // try-catch block for handling Exception 
        try { 
  
            // Getting array of Method by 
            // using GetMethods() Method 
            Type[] type = objType.GetNestedTypes(); 
  
            // Display the Result 
            Console.WriteLine("NestedType of current type is: "); 
            for (int i = 0; i < type.Length; i++) 
                Console.WriteLine("{0} ", type[i]); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e) 
        { 
            Console.Write("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
public class Person { 
  
    public class Student 
    { 
        // string name; 
        // int roll; 
        // string dept; 
    } 
  
    public class Teacher  
    { 
        // string name; 
        // string dept; 
        // int id; 
    } 
}

輸出：

NestedType of current type is: 
Person+Student 
Person+Teacher

示例2:

// C# program to demonstrate the 
// Type.GetNestedTypes() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
// Defining class Empty 
public class Empty { } 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(Animal); 
  
        // try-catch block for handling Exception 
        try { 
  
            // Getting array of Method by 
            // using GetMethods() Method 
            Type[] type = objType.GetNestedTypes(); 
  
            // Display the Result 
            Console.WriteLine("NestedType of current type is: "); 
            for (int i = 0; i < type.Length; i++) 
                Console.WriteLine(" {0}", type[i]); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e)  
        { 
            Console.Write("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
public class Animal { 
  
    public class Cat { 
  
        // string breed; 
        // string color; 
        // string type; 
    } 
  
    public class Dog { 
  
        // string breed; 
        // string color; 
        // string type; 
    } 
  
    public class Mouse { 
  
        // string breed; 
        // string color; 
        // string type; 
    } 
  
    public interface Descreption { 
  
        string getBreed(); 
        string getColor(); 
        string getType(); 
        bool isAlive(); 
    } 
}

輸出：

NestedType of current type is: 
 Animal+Cat
 Animal+Dog
 Animal+Mouse
 Animal+Descreption

GetNestedTypes(BindingFlags) Method

此方法用於在派生類中重寫時使用指定的綁定約束來搜索嵌套在當前Type中的類型。

用法： public abstract Type[] GetNestedTypes (System.Reflection.BindingFlags bindingAttr);

Here, it takes a bitmask comprised of one or more BindingFlags that specify how the search is conducted or, Zero, to return null.

返回值：此方法返回一個Type對象數組，該數組表示當前Type中嵌套的所有與指定綁定約束匹配的類型(搜索不是遞歸的)；如果未找到與綁定約束匹配的嵌套類型，則返回Type類型的空數組。

示例1:

// C# program to demonstrate the 
// Type.GetNestedTypes() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
// Defining class Empty 
public class Empty { } 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(Animal); 
  
        // try-catch block for handling Exception 
        try { 
  
            // Getting array of Method by 
            // using GetMethods() Method 
            Type[] type = objType.GetNestedTypes(BindingFlags.NonPublic); 
  
            // Display the Result 
            Console.WriteLine("NestedType of current type is: "); 
  
            for (int i = 0; i < type.Length; i++) 
                Console.WriteLine(" {0}", type[i]); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e) 
        { 
            Console.Write("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
public class Animal { 
  
    public class Cat { 
  
        // string breed; 
        // string color; 
        // string type; 
    } 
  
    private class Empty { } 
  
    public interface Descreption  
    { 
        string getBreed(); 
        string getColor(); 
        string getType(); 
        bool isAlive(); 
    } 
}

輸出：

NestedType of current type is: 
 Animal+Empty

示例2:

// C# program to demonstrate the 
// Type.GetNestedTypes() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
// Defining class Empty 
public class Empty { } 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(Person); 
  
        // try-catch block for handling Exception 
        try { 
  
            // Getting array of Method by 
            // using GetMethods() Method 
            Type[] type = objType.GetNestedTypes(BindingFlags.Public); 
  
            // Display the Result 
            Console.WriteLine("NestedType of current type is: "); 
  
            for (int i = 0; i < type.Length; i++) 
                Console.WriteLine(" {0}", type[i]); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e) 
        { 
            Console.Write("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
public class Person { 
  
    public class Student  
    { 
        // string name; 
        // int roll; 
        // string dept; 
    } 
  
    public class Teacher  
    { 
        // string name; 
        // string dept; 
        // int id; 
    } 
}

輸出：

NestedType of current type is: 
 Person+Student
 Person+Teacher

參考：

https://docs.microsoft.com/en-us/dotnet/api/system.type.getnestedtypes?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.GetNestedTypes() 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。