C#.NET 对象(字符串)转换常用扩展方法

C# Code:


/// <summary>
/// 对象(字符串)转换常用扩展方法
/// </summary>
public static class ExtensionMethods
{
   public static string ToStringEx(this string str)
   {
      if (str == null) return "";
      return str.ToString().Trim(); //.Replace(" ", "");
   }
   
   public static bool IsNullOrEmpty(this string s)
   {
      return string.IsNullOrEmpty(s.ToStringEx());
   }
   
   public static DateTime ToSqlDateTime(this string o)
   {
      DateTime defMinValue = DateTime.Parse("1753-01-01 00:00:00");
      DateTime defMaxValue = DateTime.Parse("9999-12-31 23:59:59");
      if (null == o) return defMinValue;//传入空值，返回预设值
      
      DateTime dt;
      if (DateTime.TryParse(o.ToString(), out dt))
      {
         if (dt < defMinValue || dt > defMaxValue)
         return defMinValue;//无效日期，预设返回SQL支持的最小日期
         else
         return dt;
      }
      return defMinValue;
   }
   
   public static float ToFloatEx(this string o)
   {
      if (null == o) return 0;
      try
      {
         return (float)Convert.ToDouble(o.ToString());
      }
      catch { return 0; }
   }
   
   public static int ToIntEx(this string o)
   {
      if (null == o) return 0;
      try
      {
         return Convert.ToInt32(o.ToString());
      }
      catch { return 0; }
   }
   
   public static decimal ToDecimalEx(this string o, int i = 2)
   {
      if (null == o) return 0;
      try
      {
         //Math.Round之后不自动补零
         //return decimal.Parse(Math.Round(Convert.ToDouble(s.ToString()), i).ToString());
         return decimal.Parse(Convert.ToDecimal(o.ToString()).ToString("F" i));
      }
      catch { return 0; }
   }
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898