僅在字符串不爲空或空時附加逗號

Question

我在C＃中創建簡單網絡表單。在這裏，我通過串聯的方式獲得完整的地址，這很有效。但是，讓我們假設如果我沒有address2,city等，那麼我想跳過在每個字符串末尾附加逗號（例如，如果address1爲空或空）。

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

如果你想刪除空或空字符串，你必須在連接方法中使用的濾鏡陣列：如果我們做city=""

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

我們有Address1,Address2,Country,00000

Answer 2

你可以把你所有的元素放在一個數組中，並用「，」加入數組。在這種情況下，逗號將位於不同的地址部分之間。

Answer 3

您可以使用string.join以及filter在一個或多個值爲空或空白時刪除重複的逗號。

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

Answer 4

您可以使用string.Join來完成您的任務。你可以run in dotnetfiddle。 請檢查下面的代碼：

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

String.Join是你所需要的。

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(",,",","); 

Answer 6

試試這個：

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(',');