C#在字符串中查找文本，然后返回其余文本

我正在尝试这样做：

string foo = "Hello, this is a string";
//and then search for it. Kind of like this
string foo2 = foo.Substring(0,2);
//then return the rest. Like for example foo2 returns "He".
//I want it to return the rest "llo, this is a string"

---

谢谢。

我想你应该澄清一下规则，当你需要另一个字符串时，你想要什么

        string foo = "Hello, this is a string";
        int len1 = 2; // suppose this is your rule
        string foo2 = foo.Substring(0, len1);
        string foo3 = foo.Substring(len1, foo.Length - len1); //you want this?

结果:

//He
//llo, this is a string

//He
//llo, this is a string

如果您需要一直这样做，您可以创建一个

扩展方法：

public static class Extensions
{
    public static Tuple<string, string> SplitString(this string str, int splitAt)
    {
        var lhs = str.Substring(0, splitAt);
        var rhs = str.Substring(splitAt);
        return Tuple.Create<string, string>(lhs, rhs);
    }   
}

结果:

//He
//llo, this is a string

//He
//llo, this is a string

---

你应该试试这样的

publicstringfindReturnRest（stringsourcestr，stringstrtofind）
{
返回sourceStr.Substring（sourceStr.IndexOf（strToFind）+strToFind.Length）；
}

然后

string foo=“你好，这是一个字符串”；
字符串rest=find和returnrest（foo，“He”）；

将其更改为

foo.Substring（2）。完成。