c# 通用类扩展方法代码,CSharp代码库,德仔网

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【CSharp】 c# 通用类扩展方法
作者:蓝言觅ぷ雨 / 发布于2012/7/9/ 665
通用类扩展方法
<div>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;</div>
<div>namespace Common
{
 public static class ExtensionFuncation
 {</div>
<div> #region 判断是否为空</div>
<div> /// <summary>
 /// 判断对象是否为null或者为空
 /// </summary>
 /// <param name="o"></param>
 /// <returns></returns>
 public static bool IfIsNullOrEmpty(this object o)
 {
 if (null == o || o.Equals(""))
 return true;
 else
 return false;
 }
<div> /// <summary>
 /// 判断对象是否为null或者为空
 /// </summary>
 /// <param name="o"></param>
 /// <returns></returns>
 public static bool IfIsNullOrEmpty(this string o)
 {
 if (null == o || string.IsNullOrEmpty(o.Trim()))
 return true;
 else
 return false;
 }
<div> /// <summary>
 /// 判断对象是否为null或者为空
 /// </summary>
 /// <param name="o"></param>
 /// <returns></returns>
 public static bool IfIsNullOrEmpty<T>(this List<T> o)
 { 
 if(null == o || o.Count == 0)
 return true;
 else
 return false;
 }
<div> /// <summary>
 /// 判断对象是否为null或者为空
 /// </summary>
 /// <param name="o"></param>
 /// <returns></returns>
 public static bool IfIsNullOrEmpty<T>(this IList<T> o)
 { 
 if(null == o || o.Count == 0)
 return true;
 else
 return false;
 }
<div> /// <summary>
 /// 判断对象是否为null或者为空
 /// </summary>
 /// <param name="o"></param>
 /// <returns></returns>
 public static bool IfIsNullOrEmpty<K, V>(this Dictionary<K, V> o)
 {
 if (null == o || o.Count == 0)
 return true;
 else
 return false;
 }
<div>
 #endregion</div>
<div> #region 带默认值的类型转换</div>
<div>
 /// <summary>
 /// 类型转换带默认值
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="o"></param>
 /// <param name="defaultValue">如果转换失败返回的默认值</param>
 /// <returns></returns>
 public static T ConvertToType<T>(this object o, T defaultValue)
 {
 try
 {
 return (T)System.Convert.ChangeType(o, typeof(T), null);
 }
 catch
 {
 return defaultValue;
 }
 }
 /// <summary>
 /// 类型转换带默认值
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="o"></param>
 /// <param name="defaultValue">如果转换失败返回的默认值</param>
 /// <returns></returns>
 public static T ConvertToType<T>(this string o, T defaultValue)
 {
 try
 {
 return (T)System.Convert.ChangeType(o, typeof(T), null);
 }
 catch
 {
 return defaultValue;
 }
 }
<div> #endregion</div>
<div>
 #region 提取中国首字母</div>
<div></div>
<div> /// <summary>
 /// 返回中文首字母小写格式的
 /// </summary>
 /// <param name="paramChinese"></param>
 /// <param name="ifToUpper">是否转成大写字母返回</param>
 /// <returns></returns>
 public static string GetFirstLetter(this string paramChinese, bool ifToUpper)
 {</div>
<div> string strTemp = "";

 int iLen = paramChinese.Length;

 int i = 0;



 for (i = 0; i <= iLen - 1; i++)
 {

 strTemp += GetCharSpellCode(paramChinese.Substring(i, 1));

 }
<div> return ifToUpper ? strTemp.ToUpper() : strTemp.ToLower();</div>
<div> }
<div> /// <summary></div>
<div> /// 得到一个汉字的拼音第一个字母，如果是一个英文字母则直接返回大写字母</div>
<div> /// </summary></div>
<div> /// <param name="CnChar">单个汉字</param></div>
<div> /// <returns>单个大写字母</returns></div>
<div> private static string GetCharSpellCode(string paramChar)
 {</div>
<div> long iCnChar;</div>
<div></div>
<div> byte[] ZW = System.Text.Encoding.Default.GetBytes(paramChar);</div>
<div></div>
<div> //如果是字母，则直接返回</div>
<div> if (ZW.Length == 1)
 {
 return paramChar.ToUpper();</div>
<div> }
<div> else
 {</div>
<div> // get the array of byte from the single char</div>
<div> int i1 = (short)(ZW[0]);</div>
<div> int i2 = (short)(ZW[1]);</div>
<div> iCnChar = i1 * 256 + i2;</div>
<div> }
<div></div>
<div> //expresstion</div>
<div> //table of the constant list</div>
<div> // 'A'; //45217..45252</div>
<div> // 'B'; //45253..45760</div>
<div> // 'C'; //45761..46317</div>
<div> // 'D'; //46318..46825</div>
<div> // 'E'; //46826..47009</div>
<div> // 'F'; //47010..47296</div>
<div> // 'G'; //47297..47613</div>
<div></div>
<div> // 'H'; //47614..48118</div>
<div> // 'J'; //48119..49061</div>
<div> // 'K'; //49062..49323</div>
<div> // 'L'; //49324..49895</div>
<div> // 'M'; //49896..50370</div>
<div> // 'N'; //50371..50613</div>
<div> // 'O'; //50614..50621</div>
<div> // 'P'; //50622..50905</div>
<div> // 'Q'; //50906..51386</div>
<div></div>
<div> // 'R'; //51387..51445</div>
<div> // 'S'; //51446..52217</div>
<div> // 'T'; //52218..52697</div>
<div> //没有U,V</div>
<div> // 'W'; //52698..52979</div>
<div> // 'X'; //52980..53640</div>
<div> // 'Y'; //53689..54480</div>
<div> // 'Z'; //54481..55289</div>
<div></div>
<div> // iCnChar match the constant</div>
<div> if ((iCnChar >= 45217) && (iCnChar <= 45252))
 {</div>
<div> return "A";</div>
<div> }
<div> else if ((iCnChar >= 45253) && (iCnChar <= 45760))
 {</div>
<div> return "B";</div>
<div> }
<div> else if ((iCnChar >= 45761) && (iCnChar <= 46317))
 {</div>
<div> return "C";</div>
<div> }
<div> else if ((iCnChar >= 46318) && (iCnChar <= 46825))
 {</div>
<div> return "D";</div>
<div> }
<div> else if ((iCnChar >= 46826) && (iCnChar <= 47009))
 {</div>
<div> return "E";</div>
<div> }
<div> else if ((iCnChar >= 47010) && (iCnChar <= 47296))
 {</div>
<div> return "F";</div>
<div> }
<div> else if ((iCnChar >= 47297) && (iCnChar <= 47613))
 {</div>
<div> return "G";</div>
<div> }
<div> else if ((iCnChar >= 47614) && (iCnChar <= 48118))
 {</div>
<div> return "H";</div>
<div> }
<div> else if ((iCnChar >= 48119) && (iCnChar <= 49061))
 {</div>
<div> return "J";</div>
<div> }
<div> else if ((iCnChar >= 49062) && (iCnChar <= 49323))
 {
 return "K";</div>
<div> }
<div> else if ((iCnChar >= 49324) && (iCnChar <= 49895))
 {</div>
<div> return "L";</div>
<div> }
<div> else if ((iCnChar >= 49896) && (iCnChar <= 50370))
 {</div>
<div> return "M";</div>
<div> }
<div></div>
<div> else if ((iCnChar >= 50371) && (iCnChar <= 50613))
 {</div>
<div> return "N";</div>
<div> }
<div> else if ((iCnChar >= 50614) && (iCnChar <= 50621))
 {</div>
<div> return "O";</div>
<div> }
<div> else if ((iCnChar >= 50622) && (iCnChar <= 50905))
 {</div>
<div> return "P";</div>
<div> }
<div> else if ((iCnChar >= 50906) && (iCnChar <= 51386))
 {</div>
<div> return "Q";</div>
<div> }
<div> else if ((iCnChar >= 51387) && (iCnChar <= 51445))
 {</div>
<div> return "R";</div>
<div> }
<div> else if ((iCnChar >= 51446) && (iCnChar <= 52217))
 {</div>
<div> return "S";</div>
<div> }
<div> else if ((iCnChar >= 52218) && (iCnChar <= 52697))
 {</div>
<div> return "T";</div>
<div> }
<div> else if ((iCnChar >= 52698) && (iCnChar <= 52979))
 {</div>
<div> return "W";</div>
<div> }
<div> else if ((iCnChar >= 52980) && (iCnChar <= 53688))
 {</div>
<div> return "X";</div>
<div> }
<div> else if ((iCnChar >= 53689) && (iCnChar <= 54480))
 {</div>
<div> return "Y";</div>
<div> }
<div> else if ((iCnChar >= 54481) && (iCnChar <= 55289))
 {</div>
<div> return "Z";
 }
 else return ("?");</div>
<div> }
 #endregion</div>
<div> }
}
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