100
101 if (sortAttribute != String.Empty)
102 {
103 sortColumns = sortAttribute.Split(",".ToCharArray());
104 }
105 if (sortAttribute.IndexOf(e.SortExpression) > 0 || sortAttribute.StartsWith(e.SortExpression))
106 {
107 sortAttribute = ModifySortExpression(sortColumns, e.SortExpression);
108 }
109 else
110 {
111 sortAttribute += String.Concat(",", e.SortExpression, " ASC ");
112 }
113 return sortAttribute.TrimStart(",".ToCharArray()).TrimEnd(",".ToCharArray());
114
115 }
116 /**////
117 /// 修改排序顺序
118 ///
119 protected string ModifySortExpression(string[] sortColumns, string sortExpression)
120 {
121 string ascSortExpression = String.Concat(sortExpression, " ASC ");
122 string descSortExpression = String.Concat(sortExpression, " DESC ");
123
124 for (int i = 0; i < sortColumns.Length; i++)
125 {
126
127 if (ascSortExpression.Equals(sortColumns[i]))
128 {
129 sortColumns[i] = descSortExpression;
130 }
131
132 else if (descSortExpression.Equals(sortColumns[i]))
133 {
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