类型。C# 中的 FindInterfaces()方法，带示例
原文:https://www . geesforgeks . org/type-find interfaces-method-in-c-sharp-with-examples/
类型。FindInterfaces(TypeFilter，Object)方法用于返回一个类型对象的数组，该数组表示由当前类型实现或继承的接口的过滤列表。无论是由基类声明还是由这个类本身声明，在搜索过程中都会考虑这个类实现的所有接口。 该方法搜索基类层次结构，返回每个类实现的每个匹配接口以及每个接口实现的所有匹配接口(即返回匹配接口的传递闭包)。不会返回重复的接口。
语法:
公共虚拟类型[]查找接口(系统。反射。类型过滤器过滤器，对象过滤器标准)；
参数:
- 筛选:将接口与筛选标准进行比较的代表。
- 过滤标准:决定接口是否应该包含在返回数组中的搜索标准。
返回值:该方法返回一个类型对象的数组，表示当前类型实现或继承的接口的过滤列表，如果当前类型没有实现或继承匹配过滤器的接口，则返回类型类型的空数组。
异常:如果过滤器为空，该方法抛出参数为空异常。
以下程序说明了上述方法的使用:
例 1:
// C# program to demonstrate the
// Type.FindInterfaces(TypeFilter,
// Object) Method
using System;
using System.Globalization;
using System.Reflection;
class GFG {
// Main Method
public static void Main()
{
// Creating try-catch block
// to handle exceptions
try {
// Declaring and initializing
// object Type Datatype
Type type = typeof(System.String);
// Declaring and initializing the object
// of TypeFilter Datatype which help the
// delegate that compares the interfaces
// against filterCriteria
TypeFilter myFilter = new TypeFilter(MyInterfaceFilter);
// Declaring and initializing filterCriteria
// object. It is used to search the criteria
// that determines whether an interface should
// be included in the returned array.
object filterCriteria = "System.Collections.IEnumerable";
// Getting the filtered list of interface
// using FindInterfaces() method
Type[] myInterfaces = type.FindInterfaces(myFilter,
filterCriteria);
// Display the interfaces
for (int j = 0; j < myInterfaces.Length; j++)
Console.WriteLine("filtered list of interface : {0}.",
myInterfaces[j].ToString());
}
// catch ArgumentNullException here
catch (ArgumentNullException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining MyInterfaceFilter
// which helps to fix the certain
// condition on which filtration
// took place
public static bool MyInterfaceFilter(Type typeObj,
Object criteriaObj)
{
if (typeObj.ToString() == criteriaObj.ToString())
return true;
else
return false;
}
}
Output:
filtered list of interface : System.Collections.IEnumerable.
例 2:
// C# program to demonstrate the
// Type.FindInterfaces(TypeFilter,
// Object) Method
using System;
using System.Globalization;
using System.Reflection;
class GFG {
// Main Method
public static void Main()
{
// Creating try-catch block
// to handle exceptions
try {
// Declaring and initializing
// object Type Datatype
Type type = typeof(System.String);
// Declaring and initializing object
// of TypeFilter Datatype
// which help the delegate that compares
// the interfaces against filterCriteria.
TypeFilter myFilter = null;
// Declaring and initializing filterCriteria
// object. It is used to search the criteria
// that determines whether an interface should
// be included in the returned array.
object filterCriteria = "System.Collections.IEnumerable";
// Getting the filtered list of interface
// using FindInterfaces() method
Type[] myInterfaces = type.FindInterfaces(myFilter,
filterCriteria);
// Display the interfaces
for (int j = 0; j < myInterfaces.Length; j++)
Console.WriteLine("filtered list of interface : {0}.",
myInterfaces[j].ToString());
}
// catch ArgumentNullException here
catch (ArgumentNullException e)
{
Console.WriteLine("myFilter should not be null");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
Output:
myFilter should not be null
Exception Thrown: System.ArgumentNullException
参考:
版权属于：月萌API www.moonapi.com，转载请注明出处
