摘要:效能議題-Contains與indexof的比較
一般都會認為contains比indexof效能來的好,來的快
根據http://stackoverflow.com/questions/498686/net-is-string-contains-faster-than-string-indexof
這篇文章寫到
By using Reflector, you can see, that Contains is implemented using IndexOf. Here's the implementation.
public bool Contains(string value)
{
return (this.IndexOf(value, StringComparison.Ordinal) >= 0);
}
So Contains is likely a wee bit slower than calling IndexOf directly, but I doubt that it will have any significance for the actual performance.
所以其實Contains也是呼叫indexof這個方法來比較字串,
關於StringComparison 列舉型別:
http://msdn.microsoft.com/zh-tw/library/system.stringcomparison(VS.95).aspx
關於indexof參數:
http://msdn.microsoft.com/zh-tw/library/ms224425(v=VS.80).aspx
