1.2. C#中关于字符串的处理

1.2. C#中关于字符串的处理
	第 1 章 C#学习心得

1.2.1. C#中类似于spritf的函数

C#中，类似于C中常用的spritf函数，是String.Format函数。

最简单的用法举例如下：

    string spritfTestStr = String.Format("Test sprintf in C#, number={0:D}, string=\"{1:s}\", float={2:0.000}", 100, "crifan", Math.PI);
    //spritfTestStr = Test sprintf in C#, number=100, string="crifan", float=3.142

关于Format函数的更多的示例，可以参考微软官方文档：String.Format Method (String, Object)

关于其他更多不同类型的参数，比如日期，数值，枚举等，如何指定对应的格式，可以参考：

For more information about the composite formatting feature supported by methods such as Format, AppendFormat, and some overloads of WriteLine, see Composite Formatting.

For more information about numeric format specifiers, see Standard Numeric Format Strings and Custom Numeric Format Strings.

For more information about date and time format specifiers, see Standard DateTime Format Strings and Custom DateTime Format Strings.

For more information about enumeration format specifiers, see Enumeration Format Strings.

For more information about formatting, see Formatting Types and Formatting Overview.

1.2.2. 字符串的中间对齐左右填充的效果

代码：


//input: [4] Valid: B0009IQZFM
//output: ============================ [4] Valid: B0009IQZFM =============================
public string formatString(string strToFormat, char cPaddingChar = '*', int iTotalWidth = 80)
{
    //auto added space
    strToFormat = " " + strToFormat + " "; //" [4] Valid: B0009IQZFM "
 
    //1. padding left
    int iPaddingLen = (iTotalWidth - strToFormat.Length)/2;
    int iLefTotalLen = iPaddingLen + strToFormat.Length;
    string strLefPadded = strToFormat.PadLeft(iLefTotalLen, cPaddingChar); //"============================ [4] Valid: B0009IQZFM "
    //2. padding right
    string strFormatted = strLefPadded.PadRight(iTotalWidth, cPaddingChar); //"============================ [4] Valid: B0009IQZFM ============================="
     
    return strFormatted;
}

详见：【已解决】C#中实现字符串的中间对齐左右填充的效果