在开发过程中,我们通常会将常用方法封装在一个辅助类里,提高可复用性。自.net3.5以后,.net已经支持通过this关键字为类进行扩展,目前只可以扩展静态方法,这对于常用方法的封装是很有用的。比如,给asp.net的Page类扩展WriteJson方法,直接在页面代码里用 this.WriteJson(....),即可轻松调用扩展的静态方法。以下是在工作中积累的部分代码,后续会持续更新,直接上干货:
1 using System; 2 using System.Collections.Generic; 3 using System.Web; 4 using System.Web.UI; 5 using Newtonsoft.Json; 6 using Newtonsoft.Json.Converters; 7 8 namespace www.ideek.cn 9 { 10 /// <summary> 11 /// 通用静态扩展类 12 /// </summary> 13 public static class ExtendMethod 14 { 15 /// <summary> 16 /// 页面输出Json数据格式 17 /// </summary> 18 /// <param name="page"></param> 19 /// <param name="jsonStr"></param> 20 public static void WriteJson(this Page page, string jsonStr) 21 { 22 page.Response.WriteJson(jsonStr); 23 } 24 25 /// <summary> 26 /// 页面输出字符串 27 /// </summary> 28 /// <param name="page"></param> 29 /// <param name="jsonStr"></param> 30 public static void WriteString(this Page page, string str) 31 { 32 page.Response.WriteString(str); 33 } 34 35 /// <summary> 36 /// 页面输出Json数据格式 37 /// </summary> 38 /// <param name="page"></param> 39 /// <param name="jsonStr"></param> 40 public static void WriteJson(this HttpResponse response, string jsonStr) 41 { 42 response.ContentType = "application/json"; 43 response.Charset = "UTF-8"; 44 response.Write(jsonStr); 45 response.End(); 46 } 47 48 /// <summary> 49 /// 页面输出字符串 50 /// </summary> 51 /// <param name="page"></param> 52 /// <param name="jsonStr"></param> 53 public static void WriteString(this HttpResponse response, string str) 54 { 55 response.ContentType = "text/plain"; 56 response.Charset = "UTF-8"; 57 response.Write(str); 58 response.End(); 59 } 60 61 #region 格式转化 62 63 /// <summary> 64 /// 取日期最小时间 65 /// </summary> 66 /// <param name="dt"></param> 67 /// <returns></returns> 68 public static DateTime GetDateTimeMin(this object dt) 69 { 70 return Convert.ToDateTime(Convert.ToDateTime(dt).ToString("yyyy-MM-dd 00:00:00")); 71 } 72 /// <summary> 73 /// 取日期最大时间 74 /// </summary> 75 /// <param name="dt"></param> 76 /// <returns></returns> 77 public static DateTime GetDateTimeMax(this object dt) 78 { 79 return Convert.ToDateTime(Convert.ToDateTime(dt).ToString("yyyy-MM-dd 23:59:59")); 80 } 81 82 /// <summary> 83 /// 转换为Int型,为空返回0 84 /// </summary> 85 /// <param name="obj"></param> 86 /// <returns></returns> 87 public static int ToIntValue(this object obj) 88 { 89 int result; 90 if (obj == null) return 0; 91 return int.TryParse(obj.ToString().Trim(), out result) ? result : 0; 92 } 93 94 /// <summary> 95 /// 转换为Int64(long)型,为空返回0 96 /// </summary> 97 /// <param name="obj"></param> 98 /// <returns></returns> 99 public static long ToLongValue(this object obj) 100 { 101 long result = 0; 102 if (obj == null) return result; 103 return long.TryParse(obj.ToString().Trim(), out result) ? result : 0; 104 } 105 106 /// <summary> 107 /// 转换为decimal型,为空返回0 108 /// </summary> 109 /// <param name="obj"></param> 110 /// <returns></returns> 111 public static decimal ToDecimalValue(this object obj) 112 { 113 decimal result = 0; 114 if (obj == null) return result; 115 return decimal.TryParse(obj.ToString().Trim(), out result) ? result : 0; 116 } 117 118 /// <summary> 119 /// 转换为float型,为空返回0 120 /// </summary> 121 /// <param name="obj"></param> 122 /// <returns></returns> 123 public static float ToFloatValue(this object obj) 124 { 125 float result = 0; 126 if (obj == null) return result; 127 return float.TryParse(obj.ToString().Trim(), out result) ? result : 0; 128 } 129 130 /// <summary> 131 /// 转为String类型,为null返回"" 132 /// </summary> 133 /// <param name="obj"></param> 134 /// <returns></returns> 135 public static string ToStringValue(this object obj) 136 { 137 if (obj == null) return string.Empty; 138 return obj.ToString().Trim(); 139 } 140 141 /// <summary> 142 /// 转为DateTime类型,为null返回当前时间 143 /// </summary> 144 /// <param name="obj"></param> 145 /// <returns></returns> 146 public static DateTime ToDateTimeValue(this object obj) 147 { 148 if (obj == null) return DateTime.Now; 149 return Convert.ToDateTime(obj); 150 } 151 152 /// <summary> 153 /// 转为DateTime?类型 154 /// </summary> 155 /// <param name="obj"></param> 156 /// <returns></returns> 157 public static DateTime? ToDateTime(this object obj) 158 { 159 var result = new Nullable<DateTime>(); 160 if (!string.IsNullOrEmpty(obj.ToStringValue())) 161 { 162 DateTime dt; 163 if (DateTime.TryParse(obj.ToString().Trim(), out dt)) 164 result = dt; 165 } 166 return result; 167 } 168 169 #endregion 170 } 171 }
其中,页面输出采用Newtonsoft.Json开源类库,关于Newtonsoft.Json的用法,请参考:https://github.com/JamesNK/Newtonsoft.Json
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