. net String。格式方法允许将字符串放置在固定长度的字符串中的固定位置。
" String Goes Here" " String Goes Here " "String Goes Here "
使用.NET是如何做到这一点的?
编辑-我已经尝试格式/左/右PadRight死亡。它们不起作用。我不知道为什么。最后我写了自己的函数来做这个。
编辑-我犯了一个错误，在格式说明符中使用了冒号而不是逗号。应该是“{0,20}”。
感谢所有精彩而正确的回答。
当前回答
似乎你想要这样的东西，它会把你的字符串放在一个固定长度的字符串中的一个固定点上:
Dim totallength As Integer = 100
Dim leftbuffer as Integer = 5
Dim mystring As String = "string goes here"
Dim Formatted_String as String = mystring.PadLeft(leftbuffer + mystring.Length, "-") + String.Empty.PadRight(totallength - (mystring.Length + leftbuffer), "-")
注意，如果mystring。Length + leftbuffer超过totallength
其他回答
这是VB。我创建的NET版本，受到Joel Coehoorn的回答、Oliver的编辑和shaunmartin的评论的启发:
<Extension()>
Public Function PadCenter(ByVal [string] As String, ByVal width As Integer, ByVal c As Char) As String
If [string] Is Nothing Then [string] = String.Empty
If (width <= [string].Length) Then Return [string]
Dim padding = width - [string].Length
Return [string].PadLeft([string].Length + (padding \ 2), c).PadRight(width, c)
End Function
<Extension()>
Public Function PadCenter(ByVal [string] As String, ByVal width As Integer) As String
If [string] Is Nothing Then [string] = String.Empty
If (width <= [string].Length) Then Return [string]
Dim padding = width - [string].Length
Return [string].PadLeft([string].Length + (padding \ 2)).PadRight(width)
End Function
This is set up as a string extension, inside a Public Module (the way you do Extensions in VB.NET, a bit different than C#). My slight change is that it treats a null string as an empty string, and it pads an empty string with the width value (meets my particular needs). Hopefully this will convert easily to C# for anyone who needs it. If there's a better way to reference the answers, edits, and comments I mentioned above, which inspired my post, please let me know and I'll do it - I'm relatively new to posting, and I couldn't figure out to leave a comment (might not have enough rep yet).
你已经学过左键和右键了。这将填补缺失的PadCenter。
public static class StringUtils
{
public static string PadCenter(this string s, int width, char c)
{
if (s == null || width <= s.Length) return s;
int padding = width - s.Length;
return s.PadLeft(s.Length + padding / 2, c).PadRight(width, c);
}
}
提醒自己:别忘了更新自己的简历:“有一天，我甚至修正了Joel Coehoorn的代码!”, - d哔叽
/// <summary>
/// Returns a string With count chars Left or Right value
/// </summary>
/// <param name="val"></param>
/// <param name="count"></param>
/// <param name="space"></param>
/// <param name="right"></param>
/// <returns></returns>
public static string Formating(object val, int count, char space = ' ', bool right = false)
{
var value = val.ToString();
for (int i = 0; i < count - value.Length; i++) value = right ? value + space : space + value;
return value;
}
从Visual Studio 2015开始，你也可以使用Interpolated Strings(这是一个编译器的技巧，所以你的目标是哪个版本的。net框架并不重要)。
string value = "String goes here";
string txt1 = $"{value,20}";
string txt2 = $"{value,-20}";
试试这个:
"String goes here".PadLeft(20,' ');
"String goes here".PadRight(20,' ');
对于中心，获取字符串的长度，并使用必要的字符进行左padleft和右padright操作
int len = "String goes here".Length;
int whites = len /2;
"String goes here".PadRight(len + whites,' ').PadLeft(len + whites,' ');
