字符串末尾的修飾字符串

Question

您好，我想從C＃語句中刪除最後一個單詞。這是我的查詢：

"SELECT * FROM People WHERE City = @City AND County = @County AND" 

我想刪除最後一個AND編程，我該怎麼做？ 感謝

Answer 1

var query = "SELECT * FROM People WHERE City = @City AND County = @County AND"; 
var scrubbed = query.Substring(0, query.Length - 4); 

Answer 2

如果最後一句話總是將是 「AND」：

if (yourString.EndsWith(" AND")) 
    yourString = yourString.Remove(yourString.Length - 4); 

或者，如果您需要截斷一切超出了最終的空間：

int index = yourString.LastIndexOf(' '); 
if (index > -1) 
    yourString = yourString.Remove(index); 

（雖然，as Donnie says ，真正正確的答案是不要將多餘的最後一個單詞添加到字符串中。）

Answer 3

string myString = "SELECT * FROM People WHERE City = @City AND County = @County AND"; 
Console.WriteLine(myString.Substring(0, myString.LastIndexOf(' '))); 

但是，您也可以考慮在沒有最後一個AND的情況下構建AND子句。

List<string> andConditions = new List<string>(); 
andConditions.Add("City = @City"); 
andConditions.Add("County = @County"); 
string myString = "SELECT * FROM People WHERE " + string.Join(" AND ", andConditions); 

Answer 4

多種方法用於固定已經給該字符串。

這看起來像動態生成的SQL，因此，在我看來，更合理的解決方案是永遠不會有最終的AND那裏。這可以通過計算您添加到where子句的參數數量和的and之前的每個參數。

Answer 5

也可以通過

//............ 
string query = SELECT * FROM People WHERE City = @City AND County = @County AND"; 
char[] charsAND = { 'A', 'N', 'D'}; 
char[] charsOR = { 'O', 'R'}; 
query = query.Trim().TrimEnd(charsAND).TrimEnd(charsOR); 
// 

Answer 6

做另一種方式：

string myString = "SELECT * FROM People WHERE City = @City AND County = @County AND"; 
myString = myString.TrimEnd(" AND".ToCharArray());