public class String
{
    public boolean contains(string str,boolean IgnoreCase){...}
    public string replace(string str,string str2,boolean IgnoreCase){...}
}

后

string aa="this is a Sample";
if(aa.contains("sample",false))
{...}

可能吗？

解决方法

public static class Extensions {
  public static bool contains(this string source,bool ignoreCase) {... }
}

void Example {
  string str = "aoeeuAOEU";
  if ( str.contains("a",true) ) { ... }
}

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