具有空值的String.Format C＃

我想格式化地址。這裏是我的代碼：具有空值的String.Format C＃

address = String.Format("{0}, {1}, {2}, {3}, {4}, {5}, {6}", 
         postalAddress.Line1, 
         postalAddress.Line2, 
         postalAddress.Line3, 
         postalAddress.Line4, 
         postalAddress.Suburb, 
         postalAddress.StateCode, 
         postalAddress.Pcode);

很不幸，這會產生116 Knox St, , , , Watson, ACT, 2602當2號線，3號線，線路4是空的。我如何處理空值以得到如116 Knox St, Watson, ACT, 2602的結果？

來源

2013-12-12 user2994641

'StringBuilder' +'if'？ – zerkms

請你詳細說明一下嗎？ – user2994641

你知道'StringBuilder'是什麼嗎？「if」怎麼樣？ – zerkms

看起來像這樣可以更簡潔地完成您的目的。

string[] data = new[] { 
    postalAddress.Line1, 
    postalAddress.Line2, 
    postalAddress.Line3, 
    postalAddress.Line4, 
    postalAddress.Suburb, 
    postalAddress.StateCode, 
    postalAddress.Pcode 
}; 

string address = string.Join(", ", 
          data.Where(e => !string.IsNullOrWhiteSpace(e));

來源

2013-12-12 00:38:32 McAden

在這裏，你去。這不會是非常有效的，但應該工作;）

StringBuilder sb = new StringBuilder(); 
List<string> addressParts = new List<string> { postalAddress.Line1, postalAddress.Line2, postalAddress.Line3, postalAddress.Line4, postalAddress.Suburb, postalAddress.StateCode, postalAddress.Pcode }; 
addressParts.ForEach(x => sb.Append(String.IsNullOrEmpty(x) ? "" : ", " + x)); 
string address = sb.ToString().Trim(',');

來源

2013-12-12 00:32:23 AFrieze

我建議McAden解決方案，它的優雅和很好解決您的問題。下面是關於如何使用StringBuilder的一個選項，它與其他的比較非常詳細。

如評論中所述，您可以使用StringBuilder和一系列if語句。 Thsi代碼可以很好地清理而是讓你玩它，瞭解正在發生的事情，這裏有一個例子：

var postalAddress = new { 
    Line1 = "116 Knox St", 
    Line2 = "", 
    Line3 = "", 
    Line4 = "", 
    Suburb = "Watson", 
    StateCode = "ACT", 
    Pcode = "2602", 
}; 
var builder = new StringBuilder(); 

builder.AppendFormat("{0}, ", postalAddress.Line1); 

if(!string.IsNullOrEmpty(postalAddress.Line2)) 
{ 
    builder.AppendFormat("{0}, ", postalAddress.Line2); 
} 
if(!string.IsNullOrEmpty(postalAddress.Line3)) 
{ 
    builder.AppendFormat("{0}, ", postalAddress.Line3); 
} 
if(!string.IsNullOrEmpty(postalAddress.Line4)) 
{ 
    builder.AppendFormat("{0}, ", postalAddress.Line4); 
} 

builder.AppendFormat("{0}, ", postalAddress.Suburb); 
builder.AppendFormat("{0}, ", postalAddress.StateCode); 
builder.AppendFormat("{0}", postalAddress.Pcode); 

var result = builder.ToString();

當您打印result變量，你現在有以下結果：

116 Knox St, Watson, ACT, 2602

基本上你可以使用AppendFormat字符串中追加一個格式化的方式，你可以嘗試和玩，直到它的行爲，只要你喜歡，那麼你可以重構它是領主這一堆不太行！

來源

2013-12-12 00:35:01

怎麼樣一個單線程正則表達式來刪除重複和空格。

address = String.Format("{0}, {1}, {2}, {3}, {4}, {5}, {6}", 
         postalAddress.Line1, 
         postalAddress.Line2, 
         postalAddress.Line3, 
         postalAddress.Line4, 
         postalAddress.Suburb, 
         postalAddress.StateCode, 
         postalAddress.Pcode); 

address = Regex.Replace(address, @"(,\s)+", @"$1");

來源

2017-09-09 09:26:47 Nattrass

具有空值的String.Format C＃

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