VB.NET String.Length比字符串長

Question

爲什麼下面的代碼打印'foo' Length: 10000？

如何丟棄未使用的數組元素，使字符串爲「Length：3」？

Dim arr(9999) as char 

Dim sw As StreamWriter = New StreamWriter("example.txt") 
sw.WriteLine("foo") 
sw.Close() 

Dim sr As StreamReader = New StreamReader("example.txt") 
sr.ReadBlock(arr, 0, 10000) 
sr.Close() 

Dim con as string = New String(arr) 
Console.WriteLine(String.Format("'{0}' Length: {1}", con, con.Length.ToString())) 

Answer 1

您可以使用Substring：

Dim newString As String = con.Substring(0, 3) 

Answer 2

不知道爲什麼這工作，但....

Dim lChar As New List(Of Char) 
    lChar.Add("f") 
    lChar.Add("o") 
    lChar.Add("o") 
    Dim con2 As String = lChar.ToArray ' ????? 
    Debug.Print("'" & con2 & "' Length: " & con2.Length) 

我想一個字符串是真的在心臟的數組。