C# |类型。HasElementTypeImpl()方法
原文:https://www . geesforgeks . org/c-sharp-type-haselementtypeimpl-method/
类型。HasElementTypeImpl()方法在派生类中被重写时使用，实现 HasElementType 属性并确定当前类型是包含还是引用另一个类型。这意味着此方法检查当前类型是数组、指针还是通过引用传递的。
语法:受保护的抽象 bool HasElementTypeImpl()；
返回值:如果类型是数组、指针或通过引用传递，则该方法返回 true ，否则返回 false。
以下程序说明了类型的使用。HasElementTypeImpl() 方法:
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;
}
}
Output:
myArray is not an array, pointer, or reference type.
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;
}
}
Output:
The type of System.Int32[,,,,,,] is array.
参考:
版权属于：月萌API www.moonapi.com，转载请注明出处
