C#常用方法——json转DataTable集合

Posted 2021-02-21 Leonger

方法一：

/// <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;
}

方法2：

/// <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

第二种方法结合Jobject使用过正确。