说说C#中Dictionary的用法

墨蓝 2022-10-03 00:51 210阅读 0赞

先看一个实例:

private Dictionary<string, string> needfirstReplaces = new Dictionary<string, string>()  
        \{  
                \{"one","onemail"\},  
                \{"two","twomail"\},   
                \{"three","threemail"\},  
                \{"four","fourmail"\}  
        \};

protected virtual Dictionary<string, string> firstReplaces  
        \{  
            get  
            \{  
  
                Dictionary<string, string> Replaces = new Dictionary<string, string>()\{ \};  
                return Replaces;  
            \}  
        \}

private DataTable ReplaceCloumnString(DataTable dtFormatedData, List<string> ReplaceColumn)  
        \{  
            Dictionary<string, string> newfirstReplaces = new Dictionary<string, string>();  
            newfirstReplaces = needfirstReplaces;  
            foreach (KeyValuePair<string, string> newitem in firstReplaces)  
            \{  
                if (!newfirstReplaces.ContainsKey(newitem.Key))  
                \{  
                    newfirstReplaces.Add(newitem.Key, newitem.Value);  
                \}  
            \}  
            DataTable dtFormatedDataCopy = dtFormatedData.Clone();  
            foreach (DataRow dr in dtFormatedData.Rows)  
            \{  
                foreach (KeyValuePair<string, string> item in newfirstReplaces)  
                \{  
                    foreach (string needColumn in ReplaceColumn)  
                    \{  
                        if (dr\[needColumn\].ToString().Contains(item.Key))  
                        \{  
                            string ContentStr = dr\[needColumn\].ToString();  
                            dr\[needColumn\] = ReplaceStr(ContentStr, item.Key, item.Value);  
                        \}  
                    \}  
                \}  
                DataRow drNewRow = dtFormatedDataCopy.NewRow();  
                drNewRow.ItemArray = dr.ItemArray;  
                dtFormatedDataCopy.Rows.Add(drNewRow);  
            \}  
            return dtFormatedDataCopy;  
        \}

Dictionary<string, string>是一个泛型 他本身有集合的功能有时候可以把它看成数组, 他的结构是这样的：Dictionary<\[key\], \[value\]> ,

他的特点是存入对象是需要与\[key\]值一一对应的存入该泛型, 通过某一个一定的\[key\]去找到对应的值,\[key\] 不能重复,它的单个数组是KeyValuePair<key, value>,\[value\]可以是string,int 和一个类等等.

也可以用linq来操作如:

var result = from pair in newfirstReplaces orderby pair.Key select pair;

转载于:https://www.cnblogs.com/springyangwc/archive/2011/02/24/1964065.html