C# Type.GetNestedType()用法及代碼示例

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

GetNestedType(String，BindingFlags)方法
GetNestedType(String)方法

GetNestedType(String, 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指定的嵌套類型。

用法： public abstract Type GetNestedType (string name, System.Reflection.BindingFlags bindingAttr);

參數：
name：包含要獲取的嵌套類型名稱的字符串。
bindingAttr：由一個或多個BindingFlags組成的位掩碼，用於指定如何進行搜索或為零，以返回null。

返回值：此方法返回一個表示嵌套類型的對象，該對象與指定的條件相匹配(如果找到)；否則為null。

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.GetNestedType(String,  
// BindingFlags) 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 { 
  
            Type type = objType.GetNestedType("Student", 
               BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.Write("NestedType of current type is: "); 
            Console.WriteLine(" {0}", type); 
        } 
  
        // 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

示例2:

// C# program to demonstrate the 
// Type.GetNestedType(String,  
// BindingFlags) 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 { 
  
            Type type = objType.GetNestedType(null, 
               BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.Write("NestedType of current type is: "); 
            Console.WriteLine(" {0}", type); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e)  
        { 
            Console.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining Person class 
public class Person { 
  
    // Defining class Student 
    public class Student { 
  
        // string name; 
        // int roll; 
        // string dept; 
    } 
  
    // Defining class Teacher 
    public class Teacher { 
  
        // string name; 
        // string dept; 
        // int id; 
    } 
}

輸出：

name is null.
Exception Thrown: System.ArgumentNullException

GetNestedType(String) Method

此方法用於搜索具有指定名稱的公共嵌套類型。

用法： public Type GetNestedType (string name);

Here, it takes the string containing the name of the nested type to get.

返回值：此方法返回一個對象，該對象表示具有指定名稱的公共嵌套類型(如果找到)；否則為null。

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

示例1:

// C# program to demonstrate the 
// Type.GetNestedType(String) 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 { 
  
            Type type = objType.GetNestedType("Teacher"); 
  
            // Display the Result 
            Console.Write("NestedType of current type is: "); 
            Console.WriteLine(" {0}", type); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e)  
        { 
            Console.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining Person class 
public class Person { 
  
    // Defining class Student 
    public class Student { 
  
        // string name; 
        // int roll; 
        // string dept; 
    } 
  
    // Defining class Teacher 
    public class Teacher { 
  
        // string name; 
        // string dept; 
        // int id; 
    } 
}

輸出：

NestedType of current type is:  Person+Teacher

示例2:

// C# program to demonstrate the 
// Type.GetNestedType(String)  
// 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 { 
  
            Type type = objType.GetNestedType(null); 
  
            // Display the Result 
            Console.Write("NestedType of current type is: "); 
            Console.WriteLine(" {0}", type); 
        } 
  
        // catch ArgumentNullException here 
        catch (ArgumentNullException e) 
        { 
            Console.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining Person class 
public class Person { 
  
    // Defining class Student 
    public class Student { 
  
        // string name; 
        // int roll; 
        // string dept; 
    } 
  
    // Defining class Teacher 
    public class Teacher { 
  
        // string name; 
        // string dept; 
        // int id; 
    } 
}

輸出：

name is null.
Exception Thrown: System.ArgumentNullException

參考：

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

相關用法

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