C# Type.HasElementTypeImpl()用法及代碼示例

當在派生類中重寫時，使用Type.HasElementTypeImpl()方法，實現HasElementType屬性，並確定當前Type是否包含或引用其他類型。這意味著此方法檢查當前Type是數組，指針還是通過引用傳遞。

用法： protected abstract bool HasElementTypeImpl ();

返回值：如果Type是數組，指針或通過引用傳遞，則此方法返回true，否則返回false。

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

示例1:

// C# program to demonstrate the 
// Type.HasElementTypeImpl() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // creating and initializing object of MyClass 
        MyClass mytype = new MyClass(typeof(int)); 
  
        // checking if mytype has any elementtype or not 
        if (mytype.HasElementType) 
            Console.WriteLine("The type of myArray is {0}.", mytype.elementtype); 
        else
            Console.WriteLine("myArray is not an array, pointer, or reference type."); 
    } 
} 
  
// Defining MyClass extended from TypeDelegator 
public class MyClass : TypeDelegator { 
  
    // creating and initializing elementtype with null 
    public string elementtype = null; 
  
    // creating and initializing type with null 
    private Type type = null; 
  
    // Constructor 
    public MyClass(Type type) 
                 : base(type) 
    { 
        this.type = type; 
    } 
  
    // Override Type.HasElementTypeImpl(). 
    protected override bool HasElementTypeImpl() 
    { 
  
        // Determine whether the type is an array. 
        if (type.IsArray) { 
            elementtype = "array"; 
            return true; 
        } 
  
        // Determine whether the type is a reference. 
        if (type.IsByRef)  
        { 
            elementtype = "reference"; 
            return true; 
        } 
  
        // Determine whether the type is a pointer. 
        if (type.IsPointer) 
        { 
            elementtype = "pointer"; 
            return true; 
        } 
  
        // Return false if the type is not 
        // a reference, array, or pointer type. 
        return false; 
    } 
}

輸出：

myArray is not an array, pointer, or reference type.

示例2:

// C# program to demonstrate the 
// Type.HasElementTypeImpl() Method 
using System; 
using System.Globalization; 
using System.Reflection; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        // creating and initializing object of MyClass 
        MyClass mytype = new MyClass(typeof(int[,,,,,, ])); 
  
        // checking if mytype has any elementtype or not 
        if (mytype.HasElementType) 
            Console.WriteLine("The type of {1} is {0}.", 
                       mytype.elementtype, mytype.type); 
        else
            Console.WriteLine("{0} is not an array, pointer, or reference type.", 
                                                                    mytype.type); 
    } 
} 
  
// Defining MyClass extended from TypeDelegator 
public class MyClass : TypeDelegator { 
  
    // creating and initializing elementtype with null 
    public string elementtype = null; 
  
    // creating and initializing type with null 
    public Type type = null; 
  
    // Constructor 
    public MyClass(Type type) 
                : base(type) 
    { 
        this.type = type; 
    } 
  
    // Override Type.HasElementTypeImpl(). 
    protected override bool HasElementTypeImpl() 
    { 
        // Determine whether the type is an array. 
        if (type.IsArray)  
        { 
  
            elementtype = "array"; 
            return true; 
        } 
  
        // Determine whether the type is a reference. 
        if (type.IsByRef)  
        { 
            elementtype = "reference"; 
            return true; 
        } 
  
        // Determine whether the type is a pointer. 
        if (type.IsPointer)  
        { 
            elementtype = "pointer"; 
            return true; 
        } 
  
        // Return false if the type is not a  
        // reference, array, or a pointer type 
        return false; 
    } 
}

輸出：

The type of System.Int32[,,,,,,] is array.

參考：

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