zoukankan      html  css  js  c++  java
  • 【C#开发中常用方法】json转DataTable

    /// <summary>
    /// 将json转换为DataTable
    /// </summary>
    /// <param name="strJson">得到的json</param>
    /// <returns></returns>
    private DataTable JsonToDataTable(string strJson)
    {
        //转换json格式
        strJson = strJson.Replace(","", "*"").Replace("":", ""#").ToString();
        //取出表名
        var rg = new Regex(@"(?<={)[^:]+(?=:[)", RegexOptions.IgnoreCase);
        string strName = rg.Match(strJson).Value;
        DataTable tb = null;
        //去除表名
        strJson = strJson.Substring(strJson.IndexOf("[") + 1);
        strJson = strJson.Substring(0, strJson.IndexOf("]"));

        //获取数据
        rg = new Regex(@"(?<={)[^}]+(?=})");
        MatchCollection mc = rg.Matches(strJson);
        for (int i = 0; i < mc.Count; i++)
        {
            string strRow = mc[i].Value;
            string[] strRows = strRow.Split('*');

            //创建表
            if (tb == null)
            {
                tb = new DataTable();
                tb.TableName = strName;
                foreach (string str in strRows)
                {
                    var dc = new DataColumn();
                    string[] strCell = str.Split('#');

                    if (strCell[0].Substring(0, 1) == """)
                    {
                        int a = strCell[0].Length;
                        dc.ColumnName = strCell[0].Substring(1, a - 2);
                    }
                    else
                    {
                        dc.ColumnName = strCell[0];
                    }
                    tb.Columns.Add(dc);
                }
                tb.AcceptChanges();
            }

            //增加内容
            DataRow dr = tb.NewRow();
            for (int r = 0; r < strRows.Length; r++)
            {
                dr[r] = strRows[r].Split('#')[1].Trim().Replace(",", ",").Replace(":", ":").Replace(""", "");
            }
            tb.Rows.Add(dr);
            tb.AcceptChanges();
        }

        return tb;
    }

    /// <summary>
    /// Json 字符串 转换为 DataTable数据集合
    /// </summary>
    /// <param name="json"></param>
    /// <returns></returns>
    public static DataTable ToDataTable(this string json)
    {
        DataTable dataTable = new DataTable();  //实例化
        DataTable result;
        try
        {
            JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
            javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
            ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
            if (arrayList.Count > 0)
            {
                foreach (Dictionary<string, object> dictionary in arrayList)
                {
                    if (dictionary.Keys.Count<string>() == 0)
                    {
                        result = dataTable;
                        return result;
                    }
                    if (dataTable.Columns.Count == 0)
                    {
                        foreach (string current in dictionary.Keys)
                        {
                            dataTable.Columns.Add(current, dictionary[current].GetType());
                        }
                    }
                    DataRow dataRow = dataTable.NewRow();
                    foreach (string current in dictionary.Keys)
                    {
                        dataRow[current] = dictionary[current];
                    }
     
                    dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
                }
            }
        }
        catch
        {
        }
        result = dataTable;
        return result;
    }

    第一种方法使用过,正确

    第二种方法尚未使用

  • 相关阅读:
    [BZOJ 1698] 荷叶池塘
    [BZOJ 3132] 上帝造题的七分钟
    [JLOI2011] 飞行路线
    [Codeforces Round49F] Session in BSU
    [BZOJ 3036] 绿豆蛙的归宿
    CRC-16校验原理
    ubuntu下mysql的安装与配置
    【OpenCV】边缘检测:Sobel、拉普拉斯算子
    我对sobel算子的理解
    梯度算子(普通的+Robert + sobel + Laplace)
  • 原文地址:https://www.cnblogs.com/LiCoco/p/6183643.html
Copyright © 2011-2022 走看看