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C# Type.IsAssignableFrom(Type)用法及代碼示例


Type.IsAssignableFrom(Type)方法用於確定是否可以將指定類型的實例分配給當前類型的變量。

用法： public virtual bool IsAssignableFrom (Type c);

Here, it takes the type to compare with the current type.

返回值：如果滿足以下任一條件，則此方法返回true：


  • c和當前實例代表相同的類型。
  • c是從當前實例直接或間接派生的。如果c從當前實例繼承，則直接從當前實例派生；如果c繼承自從當前實例繼承的一個或多個類的繼承，則c是從當前實例間接派生的。
  • 當前實例是c實現的接口。
  • c是泛型類型參數，當前實例表示c的約束之一。

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

示例1:

// C# program to demonstrate the 
// Type.IsAssignableFrom() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
using System.IO; 
  
// Defining MyClass extended 
// from TypeDelegator 
public class MyClass : TypeDelegator { } 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(TypeDelegator); 
  
        // Getting array of Properties by 
        // using GetProperties() Method 
        bool status = objType.IsAssignableFrom(typeof(MyClass)); 
  
        // Display the Result 
        if (status) 
            Console.WriteLine("Instance of a specified type can be "
                   + "assigned to a variable of the current type."); 
        else
            Console.WriteLine("Instance of a specified type can't be "
                     + "assigned to a variable of the current type."); 
    } 
}
輸出： 
Instance of a specified type can be assigned to a variable of the current type.

示例2: 

// C# program to demonstrate the 
// Type.IsAssignableFrom() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
using System.IO; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // Declaring and initializing object of Type 
        Type objType = typeof(double); 
  
        // Getting array of Properties by 
        // using GetProperties() Method 
        bool status = objType.IsAssignableFrom(typeof(int)); 
  
        // Display the Result 
        if (status) 
            Console.WriteLine("Instance of a specified type can be "
                   + "assigned to a variable of the current type."); 
        else
            Console.WriteLine("Instance of a specified type can't be "
                     + "assigned to a variable of the current type."); 
    } 
}
輸出： 
Instance of a specified type can't be assigned to a variable of the current type.

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.IsAssignableFrom(Type) 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。