While循環現有

Question

我怎麼能寫一個while循環提到以下（僞代碼）的索引：

While the index of "blahblah" in string 1 exists 

do this 

Answer 1

while(string1.Contains("blahblah")) { 
    // do this 
} 

僞編譯成C＃成功。 0個錯誤，0個警告。所用時間：0：00：01.860。

Answer 2

var string1 = "blahblah blahblah blahblah blahblah "; 
    int pos = -1; 
    while (0 >= (pos = string1.IndexOf("blahblah", pos + 1))) 
    { 
    // do this. 
    }