我有很多小时在思考如何解决,这是我的功能：
private String TextAlignCenter(String Line)
{
String CenterLine = String.Empty;
if (Line.Length > 36)
{
for (int i = 0; i < Line.Length; i += 36)
{
if ((i + 36) < Line.Length)
TextAlignCenter(Line.Substring(i,36));
else
TextAlignCenter(Line.Substring(i));
}
}
else
{
Int32 CountLineSpaces = (int)(36 - Line.Length) / 2;
for (int i = 0; i < CountLineSpaces; i++)
{
CenterLine += (Char)32;
}
CenterLine += Line;
}
Console.WriteLine(CenterLine);
return CenterLine;
}
此函数将一个字符串拆分为36个字符的部分字符,然后添加带有空格的结果字符以生成居中文本：
例如：
string x = "27 Calle,Col. Ciudad Nueva,San Pedro Sula,Cortes"; TextAlignCenter(x);
结果：
Line1: 27 Calle,San Ped Line2: ro Sula,Cortes Line3:[EmptyLine]
Line1和Line2是正确的,但我不需要Line3,我怎么能防止打印这条不必要的线？
更新：
这些行被添加到ArrayList()中
ArrayList Lines = new ArrayList(); string x = "27 Calle,Cortes"; Lines.Add(TextAlignCenter(x)); Console.WriteLine(Lines.Count);
解决方法
您只需要一个完整块的循环和最后一个的特殊条件：
public static IEnumerable<String> SplitByLength(String value,int size,// you may want to set default for size,i.e. "size = 36"
Char padding = ' ') {
if (String.IsNullOrEmpty(value))
yield break; // or throw an exception or return new String(padding,size);
if (size <= 0)
throw new ArgumentOutOfRangeException("size","size must be a positive value");
// full chunks with "size" length
for (int i = 0; i < value.Length / size; ++i)
yield return value.Substring(i * size,size);
// the last chunk (if it exists) should be padded
if (value.Length % size > 0) {
String chunk = value.Substring(value.Length / size * size);
yield return new String(padding,(size - chunk.Length) / 2) +
chunk +
new String(padding,(size - chunk.Length + 1) / 2);
}
}
...
String source = "27 Calle,Cortes";
// I've set padding to '*' in order to show it
// 27 Calle,// Col. Ciuda
// d Nueva,S
// an Pedro S
// ula,Corte
// ****s*****
Console.Write(String.Join(Environment.NewLine,SplitByLength(source,10,'*')));
你的样本：
string x = "27 Calle,Cortes"; List<String> lines = SplitByLength(x,36).ToList();
