如何截斷在.NET

Question

鑑於字符串的字符串：/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx

我想要的第三/後刪除所有尾隨字符，這樣的結果是：​​

我想這樣做沒有使用斯普利特或Charindex。

Answer 1

string str = "/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx"; 

string newStr = str.SubString(0,24); 

我想這會回答你的問題！

Answer 2

好的，你的要求有點難。所以，這個是什麼：

string RemoveAfterThirdSlash(string str) 
{ 
    return str.Aggregate(
      new { 
       sb = new StringBuilder(), 
       slashes = 0 
      }, (state, c) => new { 
       sb = state.slashes >= 3 ? state.sb : state.sb.Append(c), 
       slashes = state.slashes + (c == '/' ? 1 : 0) 
      }, state => state.sb.ToString() 
     ); 
} 

Console.WriteLine(RemoveAfterThirdSlash("/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx")); 

Answer 3

此代碼acheives你需要什麼，但我寧願使用現有的.NET方法

string str = "/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx"; 

int index = 0; 
int slashCount = 0; 

for (int i = 0; i < str.Length; i++) 
{ 
    if (str[i] == '/' && slashCount < 3) 
    { 
     index = i; 
     slashCount++; 
    } 
} 

string newString = str.Substring(index + 1); 

Answer 4

因爲你與路徑工作做在1號線，你可以這樣做：

Public Function GetPartialPath(ByVal input As String, ByVal depth As Integer) As String 

     Dim partialPath As String = input 
     Dim directories As New Generic.List(Of String) 

     Do Until String.IsNullOrEmpty(partialPath) 
      partialPath = IO.Path.GetDirectoryName(partialPath) 
      directories.Add(partialPath) 
     Loop 

     If depth > directories.Count Then depth = directories.Count 

     Return directories.ElementAt(directories.Count - depth) 

    End Function 

未測試。