如何从字符串中获取子字符串。 [英] How to get a sub-string from a string.

问题描述

大家好，



我不知道如何从字符串中获取子字符串。实际上我正在开发一个项目，它向用户发送一个自动生成的电子邮件，在那个电子邮件中，他们是用户可以通过其访问网站的链接，现在我需要做的是从链接中提取数据并将其读入例如，这是我的链接（localhost：57684 / Booking_Site_TimeSlots？code = 58_148），最后一个数字58_148是两个不同的ID，例如58是用户ID，148是系列ID，我需要使用字符串获取这些ID然后我需要创建一个子字符串来分隔这些ID，这是我为了从链接中获取ID而创建的字符串（字符串代码=！string.IsNullOrEmpty（Request.QueryString [code]）？Request.QueryString [ code]：Guid.Empty.ToString（）;）



请帮帮我个人，

谢谢。



我尝试了什么：



我无法解决这个问题我尝试过但是他们没有用。

Hi Everyone,

I do not know how to get a sub-string form a string. Actually i am working on a project which sends an automatically generated email to the user and in that email their is a link through which the user can access the website, now what i need to do is to extract data from the link and read it into the website for example this is my link (localhost:57684/Booking_Site_TimeSlots?code=58_148) and the last numbers 58_148 are two different IDs like 58 is the user ID and 148 is the Series ID, i need to get these IDs using a string and then i need to create a substring to separate these IDs and this is the string i have created to get the IDs from the link (string code = !string.IsNullOrEmpty(Request.QueryString["code"]) ? Request.QueryString["code"] : Guid.Empty.ToString();)

Please Help Me out Guys,
Thank You.

What I have tried:

Im not able to work out this i tried somethings but they did not worked.

推荐答案

你可以使用string.Split（）来分隔ID，例如

You can use string.Split() to separate out the IDs e.g.

var s = "localhost:57684/Booking_Site_TimeSlots?code=58_148";
var l = s.Split('=');
var id = l[l.GetLength(0) - 1];
var x = id.Split('_');
Console.WriteLine("Separated parts are: {0},{1}", x[0], x[1]);

给出结果

Separated parts are: 58,148

你应该在这里添加一些检查以确保你确实在数组元素中有数据

You should add some checks in here to make sure you actually have data in the array elements

private static string[] GetIds(string inputStr)
{
    string[] returnStrings = {"Null","Null"};
    // Yes I intended these to be the word Null not null value for the purpose of this demo

    if (inputStr == null) return returnStrings;
    if (!inputStr.Contains("=")) return returnStrings;

    var l = inputStr.Split('=');
    if (l.Length > l.GetLength(0) - 1)
    {
        var id = l[l.GetLength(0) - 1];
        returnStrings = id.Split('_');
    }
    return returnStrings;
}

以下是一些测试运行

And here are some test runs

string[] tests =
{
    "localhost:57684/Booking_Site_TimeSlots?code=58_148",
    "localhost:57684/Booking_Site_TimeSlots?code=58",
    "localhost:57684/Booking_Site_TimeSlots?code",
    "localhost:57684/Booking_Site_TimeSlots?code=58_148_88",
    "localhost:57684/Booking_Site_TimeSlots?code=",
    ""
};
for (var i = 0; i < tests.GetLength(0); i++)
{
    var r = GetIds(tests[i]);

    Console.WriteLine("INPUT: {0}. Separated parts are {1}, {2}", tests[i],
        (r.GetLength(0) >= 1) ? r[0] : "Not Found", 
        (r.GetLength(0) >= 2) ? r[1] : "Not Found");
}

结果：

Results:

INPUT: localhost:57684/Booking_Site_TimeSlots?code=58_148. Separated parts are 58, 148
INPUT: localhost:57684/Booking_Site_TimeSlots?code=58. Separated parts are 58, Not Found
INPUT: localhost:57684/Booking_Site_TimeSlots?code. Separated parts are Null, Null
INPUT: localhost:57684/Booking_Site_TimeSlots?code=58_148_88. Separated parts are 58, 148
INPUT: localhost:57684/Booking_Site_TimeSlots?code=. Separated parts are , Not Found
INPUT: . Separated parts are Null, Null

我故意使用Null和Not Found来证明值的设置位置。

I deliberately used "Null" and "Not Found" to demonstrate where the values were being set.

这篇关于如何从字符串中获取子字符串。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！