变量String.Format长度 [英] Variable String.Format length

问题描述

我有以下代码：

  var str =ABC; 
 var n = 7; 
 var output = String.Format（{0，n}，str）; 
  

这应该输出字符串

<$ p $ $ ABC $
$ / code>

如何更改上面的行

解决方案

格式字符串也只是字符串 - 您可以分别定义格式：

  int n = 3; 
 string format = string.Format（{{0，{0}}}，n）; 
 //更可读：string format ={0，+ n +}; 
 var output = string.Format（format，str）; 
  

编辑：

看起来像你想要的也可以通过 PadLeft（） ：

  var str =ABC; 
 string output = str.PadLeft（7）; 
  

I have the following code:

var str = "ABC";
var n = 7;
var output = String.Format("{0,n}", str);

This should output the string

"    ABC"

How should I change the line above?

解决方案

Format strings are just strings too - you can define the format separately:

int n = 3;
string format = string.Format("{{0,{0}}}", n);
//or more readable: string format = "{0," + n + "}";
var output = string.Format(format, str);

Edit:

After your update it looks like what you want can also be achieved by PadLeft():

var str = "ABC";
string output = str.PadLeft(7);

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