Named Formats!

原文发布时间为：2011-06-26 —— 来源于本人的百度文章 [由搬家工具导入]

using System;
using System.Text;
using System.Web;
using System.Web.UI;

namespace StringLib
{
public static class HenriFormatter
{
public static string FormatWith(this string format, object source)
{
if (format == null)
throw new ArgumentNullException("format");

var result = new StringBuilder(format.Length * 2);
var expression = new StringBuilder();

var e = format.GetEnumerator();
while (e.MoveNext())
{
var ch = e.Current;
if (ch == '{')
{
while (true)
{
if (!e.MoveNext())
throw new FormatException();

ch = e.Current;
if (ch == '}')
{
result.Append(OutExpression(source, expression.ToString()));
expression.Length = 0;
break;
}
if (ch == '{')
{
result.Append(ch);
break;
}
expression.Append(ch);
}
}
else if (ch == '}')
{
if (!e.MoveNext() || e.Current != '}')
throw new FormatException();
result.Append('}');
}
else
{
result.Append(ch);
}
}

return result.ToString();
}

private static string OutExpression(object source, string expression)
{
string format = "{0}";

int colonIndex = expression.IndexOf(':');
if (colonIndex > 0)
{
format = "{0:" + expression.Substring(colonIndex + 1) + "}";
expression = expression.Substring(0, colonIndex);
}

try
{
return DataBinder.Eval(source, expression, format) ?? string.Empty;
}
catch (HttpException)
{
throw new FormatException();
}
}
}

}

===============

MembershipUser user = Membership.GetUser();

"{UserName} last logged in at {LastLoginDate}".FormatWith(user);

output===》 njwu last logged in at 2010年1月6日08:07:39

=============

"{CurrentTime} - {UrL}".FormatWith(new { CurrentTime = DateTime.Now, url = "http://hi.baidu.com/handboy" });

output==》2010年1月6日08:07:39 - http://hi.baidu.com/handboy

===================

"{{{UserName}}} last logged in at {LastLoginDate}".FormatWith(user);

output==> {njwu} last logged in at 2010年1月6日08:07:39

================

Console.WriteLine("{date:yyyy-MM-dd},{url}".FormatModel(new { date = DateTime.Now, url = "http://hi.baidu.com/handboy" }));

output==> 2011-06-26,http://hi.baidu.com/handboy

==================