1. List 转成DataSet

/// 
        /// 集合数据转成 DataSet        /// 
        /// 
             ///         /// 
             public static DataSet ToDataSet
     
      (this IList
      
        list)        {            Type elementType = typeof(TSource);            DataSet ds = new DataSet();            DataTable dt = new DataTable();            ds.Tables.Add(dt);            foreach (var pi in elementType.GetProperties())            {                Type colType = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;                dt.Columns.Add(pi.Name, colType);            }            foreach (TSource item in list)            {                DataRow row = dt.NewRow();                foreach (var pi in elementType.GetProperties())                {                    row[pi.Name] = pi.GetValue(item, null) ?? DBNull.Value;                }                dt.Rows.Add(row);            }            return ds;        }        public static DataSet ToDataSet
       
        (this ICollection
        
          list)        {            Type elementType = typeof(TSource);            DataSet ds = new DataSet();            DataTable dt = new DataTable();            ds.Tables.Add(dt);            foreach (var pi in elementType.GetProperties())            {                Type colType = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;                dt.Columns.Add(pi.Name, colType);            }            foreach (TSource item in list)            {                DataRow row = dt.NewRow();                foreach (var pi in elementType.GetProperties())                {                    row[pi.Name] = pi.GetValue(item, null) ?? DBNull.Value;                }                dt.Rows.Add(row);            }            return ds;        }
        
       
      
     

　2.　枚举扩展函数

/// 
        /// 枚举扩展函数        /// 
      
       把枚举转换成对应的byte 类型，再转换成String
              /// 
        ///         /// 
             public static string ToByteString(this Enum en)        {            return ((byte)(dynamic)en).ToString();        }

　3. Md5加密函数    

/// 
        ///     Md5加密函数        /// 
        ///         /// 
             public static string Encrypt(string strPwd)        {            var md5Hasher = MD5.Create();            var data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(strPwd)); //将字符编码为一个字节序列             var sBuilder = new StringBuilder(); //计算data字节数组的哈希值            foreach (var @byte in data)            {                sBuilder.Append(@byte.ToString("x2"));            }            return sBuilder.ToString();        }

 

4.MVC 扩展

/// 
        ///  MVC 扩展        /// 
        /// The parer.        /// Type of the subject.        /// 
             public static MvcHtmlString MvcHtmlStringExpand(string parer, byte subjectType)        {            var html = "
这是一个扩展方法
";                    return MvcHtmlString.Create(html);        }

 

 

5.字符串转换成byte

/// 
        /// 字符串转换成byte        /// 
        ///         /// 
             public static byte ToByte(this string val)        {            if (string.IsNullOrEmpty(val))            {                return 0;            }            var intVal = int.Parse(val);            return (byte)intVal;        }

 6.字符串转换成int16

/// 
        /// 字符串转换成int16        /// 
        ///         /// 
             public static short ToInt16(this string val)        {            if (string.IsNullOrEmpty(val))            {                return 0;            }            var intVal = int.Parse(val);            return (short)intVal;        }

7.字符串是否为空

/// 
        /// 字符串是否为空        /// 
        ///         /// 
             public static bool IsNull(this string val)        {            return string.IsNullOrEmpty(val);        }

8.字符串是不为空，有值状态

/// 
        /// 字符串是不为空，有值状态        /// 
        ///         /// 
             public static bool IsNotNull(this string val)        {            return !string.IsNullOrEmpty(val);        }