Question

谁能帮我看一段简单的用c#统计字符串中某个字符出现次数的程序?

结果不正确，是因为中间item赋值有问题吗？ 提前感谢！

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int iSumofC = 0;
string sTextline = "The Austin, Texas-based music and media festival, South by Southwest opens March 8th. The ten-day long festival brings hundreds of artists, entertainers and media interests to town. Christopher Cruise plays music from some of this year's guests.";

foreach (var item in sTextline);

{
int item = 0;
if (item == 'c') ;
{ iSumofC = iSumofC + 1; }
}
Console.WriteLine("c freq={0}",iSumofC);
Console.ReadKey();
}
}
}

Answer 1

int item = 0;
if (item == 'c') ;
{ iSumofC = iSumofC + 1; }
你这里int型和字符型比较是想干嘛？你干嘛不直接用foreach循环里面的item直接判断就可以了。而且现在统计这个出现的次数可以更加快捷的方法。

追问

我刚开始学c#， 这是老师上课讲的实例，但我没记住。int item 这句是我自己乱加的。
因为如果没有这句，就提示：当前上下文中不存在名称“item”。弄不明白啊。

追答

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int iSumofC = 0;
string sTextline = "The Austin, Texas-based music and media festival, South by Southwest opens March 8th. The ten-day long festival brings hundreds of artists, entertainers and media interests to town. Christopher Cruise plays music from some of this year's guests.";
foreach (var item in sTextline)
{
if (item == 'c')
{
iSumofC = iSumofC + 1;
}
}
Console.WriteLine("c freq={0}", iSumofC);
Console.ReadKey();
}
}
}
我复制出来改了下，现在编译通过了

Answer 2

int item = 0;

这句去掉就哦了。

追问

去掉这一句，提示错误：当前上下文中不存在名称“item”。