JSON与DataTable相互装换

• DataTable转换JSON

/// <summary>
/// DataTable转换Json
/// </summary>
/// <param name="dt">DataTable对象</param>
/// <returns></returns>
public static string ToJson(DataTable dt)
{
    JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer {MaxJsonLength = Int32.MaxValue};
    ArrayList arrayList = new ArrayList();
    foreach (DataRow dataRow in dt.Rows)
    {
        Dictionary<string, object> dictionary = new Dictionary<string, object>();
        foreach (DataColumn dataColumn in dt.Columns)
        {
            dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToString());
        }
        arrayList.Add(dictionary); 
    }
    return javaScriptSerializer.Serialize(arrayList);
}

• JSON转换DataTable

/// <summary>
/// json转为DataTable
/// </summary>
/// <param name="strJson"></param>
/// <returns></returns>
public static 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("[", StringComparison.Ordinal) + 1);
    strJson = strJson.Substring(0, strJson.IndexOf("]", StringComparison.Ordinal));
    //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;
}