编程学习网为您整理以下代码实例，主要实现：C#计算字符串中单词的出现次数，希望可以帮到各位朋友。
using System;
class Program {
static voID Main() {
string str = "Hello World! Hello!";
Console.Writeline("Occurrence:"+Check.CheckOccurrences(str, "Hello"));
}
}
public static class Check {
public static int CheckOccurrences(string str1, string pattern) {
int count = 0;
int a = 0;
while ((a = str1.IndexOf(pattern, a)) != -1) {
a += pattern.Length;
count++;
}
return count;
}
}
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