C# DataTable 行转列

原数据结构：

 

转换后数据结构：

当然可以移除不必要的列：如：FNetCostAmount ,移除方法很简单，

//参数肯定是数据源啦。

DataTable dt = RowToCol(newDt);

dt.Columns.Remove("FNetCostAmount");

 

 

 

 

private DataTable RowToCol(DataTable dataSource)
        {
            //读取所需列内所有行数据
            DataTable newDataTable = dataSource;
            //维度：1、列标题名   2、⒈行坐标 ⒉行内值
            Dictionary> myDictionary = new Dictionary>();
            for (int i = 0; i < newDataTable.Rows.Count; i++)
            {
                if (!myDictionary.ContainsKey(newDataTable.Rows[i]["FBrandGroupname"].ToString()))
                {
                    Dictionary myIndex = new Dictionary();
                    myIndex.Add(i, newDataTable.Rows[i]["FNetCostAmount"].ToString());
                    myDictionary.Add(newDataTable.Rows[i]["FBrandGroupname"].ToString(), myIndex);
                }
                else
                {
                    myDictionary[newDataTable.Rows[i]["FBrandGroupname"].ToString()].Add(i, newDataTable.Rows[i]["FNetCostAmount"].ToString());
                }
            }
            newDataTable.Columns.Remove("FBrandGroupname");
            foreach (string key in myDictionary.Keys)
            {
                newDataTable.Columns.Add(key);
                foreach (KeyValuePair item in myDictionary[key.ToString(CultureInfo.InvariantCulture)])
                {
                    newDataTable.Rows[item.Key][key] = item.Value;
                }
            }
            return newDataTable;

        }

 

不懂的，自己打断点看数据格式。

转载于:https://www.cnblogs.com/IThefeng/p/3196296.html