由于异常结束了当前正在运行的方法，并且该方法可能打开了一个文件或网络，需要在当前方法结束时关闭，因此可能会导致错误。为了克服这样的问题，我们在C#中有一个特殊的保留关键字，叫做Finally，当try和catch块的执行停止时，就会执行这个Finally代码块，无论什么情况导致执行停止，它都不会停止。不管try块的执行是正常停止还是异常停止。Finally代码块的主要目的是执行并释放所占用的资源，它写在try和catch代码块之后.
语法：
try
{
//Block of code
}
// this can be optional
catch
{
//Block of code
}
finally
{
//Block of code
}下面是C#的例子最后：
C# 程序，演示在程序中使用 Final 代码块。
代码：
using System;
//a class called program is defined
class program
{
// a method called ClassA() is defined
static void ClassA()
{
try
{
Console.WriteLine("We are inside class A");
//An exception is thrown
throw new Exception("An exception is thrown");
}
//finally block is executed regardless of the exception is handled or not
finally
{
Console.WriteLine("This is the finally block of Class A");
}
}
// a method called ClassB() is defined
static void ClassB()
{
try
{
Console.WriteLine("We are Inside class B");
return;
}
//finally block is executed regardless of the exception is handled or not
finally
{
Console.WriteLine("This is the finally block of class B");
}
}
// Main Method is called
public static void Main(String[] args)
{
try
{
ClassA();
}
catch (Exception)
{
Console.WriteLine("The exception that is thrown is caught");
}
ClassB();
}
}输出：
说明：上面的程序中，程序就是定义的类。然后定义了一个名为 ClassA 的方法，其中编写了 try 和 finally 代码块。 try 块抛出一个稍后被捕获的异常。然后无论异常是否被处理，都会执行Finally块。然后定义了一个名为ClassB的方法。然后无论异常是否被处理，都会执行finally块。然后调用main方法。
C# 程序，演示在具有异常处理的程序中使用finally关键字。
代码：
using System;
//a class called program is defined
public class program
{
// Main Method is called
static public void Main()
{
// two integer variables are defined to store two integers
intnum = 10;
int div = 0;
//try and catch block is defined in which an exception is raised by try block and is handled by catch block
try
{
int op = num / div;
}
catch (DivideByZeroException)
{
Console.WriteLine("The divisor can not be zero because it is impossible to divide by 0");
}
// finally block is executed regardless of the exception is handled or not
finally
{
Console.WriteLine("We are in the finally block");
}
}
}输出：
说明：在上面的程序中，定义了一个名为program的类。然后调用 main 方法。然后定义两个整型变量来存储两个整数。然后定义try和catch块，其中异常由try块引发并由catch块处理。然后无论异常是否被处理，都会执行finally块。
C# 程序，演示在没有异常处理的程序中使用finally关键字。
代码：
using System;
//a class called program is defined
public class program
{
// Main Method is called
static public void Main()
{
// two integer variables are defined to store two integers
intnum = 10;
int div = 0;
//try and catch block is defined in which an exception is raised by try block and is handled by catch block
try
{
int op = num / div;
}
// finally block is executed regardless of the exception is handled or not
finally
{
Console.WriteLine("We are in the finally block");
}
}
}输出：
说明：在上面的程序中，定义了一个名为program的类。然后调用 main 方法。然后定义两个整型变量来存储两个整数。然后定义try块。然后无论异常是否被处理，都会执行finally块。程序的输出如上面的快照所示。
结论：在本教程中，我们通过定义、语法、编程示例及其输出来了解 C# 中的 finally 关键字的概念。
这是 C# 最终指南。在这里，我们最后讨论 C# 的简介及其优点以及示例和代码实现。您还可以浏览我们其他推荐的文章以了解更多信息 –
以上是C#终于的详细内容。更多信息请关注PHP中文网其他相关文章！
