Question

我在C＃中创建简单的webform。在这里，我通过连接哪个效果很好来获得完整的地址。但是，如果我没有address2，city等，那么我想跳过每个字符串末尾的逗号（例如，如果address1为空或空）。

string address1 = "Address1";
string address2 = "Address2";
string city = "City";
string country = "Country";
string postalCode = "00000";

string fullAddress = ? --> address1 + ","+ address2 +","+ city  and so on

Answer 1

如果要删除空字符串或空字符串，则必须过滤连接方法中使用的数组：

var array = new[] { address1, address2, city, country, postalCode };
string fullAddress = string.Join(",", array.Where(s => !string.IsNullOrEmpty(s)));

如果我们city=""，我们会Address1,Address2,Country,00000

Answer 2

当一个或多个值为null或为空时，您可以使用string.join和filter删除重复的逗号。

Console.WriteLine(string.Join(",", new string[] { address1 , address2 , city , country , postalCode }.Where(c => !string.IsNullOrEmpty(c))));

Answer 3

试试这个：

string address1 = "Address1";
string address2 = "Address2";
string city = "";
string country = "Country";
string postalCode = "00000";

Func<string, string> f = s => string.IsNullOrEmpty(s) ? string.Empty : string.Format("{0},", s);
string fullAddress = string.Format("{0}{1}{2}{3}{4}", f(address1), f(address2), f(city), f(country), f(postalCode)).Trim(',');

Answer 4

您可以使用string.Join来完成任务。你可以run in dotnetfiddle。请查看以下代码：

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string address1 = "Address1";
        string address2 = "Address2";
        string city = "City";
        string country = "Country";
        string postalCode = "00000";

        List<string> strArray = new List<string> { address1, address2, city, country, postalCode };

        string fullAddress = string.Join(",", strArray.Where(m=> !string.IsNullOrEmpty(m)).ToList());

        Console.WriteLine(fullAddress);
    }
}

Answer 5

您可以将所有元素放在数组中，并使用“，”将数组连接起来。在这种情况下，逗号将放置在您的不同地址部分之间。

Answer 6

String.Join就是您所需要的。

string address1 = "Address1";
string address2 = "Address2";
string city = "City";
string country = "Country";
string postalCode = "00000";

string[] stuff = new string [] { address1, address2, city, country, postalCode };

string fulladdress = string.Join(",", stuff).Replace(",,",",");

仅当字符串不为null或为空时才附加逗号

6 个答案: