/// <summary>
/// 将datatable转换为json
/// </summary>
/// <param name="dtb"></param>
/// <returns></returns>
private string Dtb2Json(DataTable dtb) {
  JavaScriptSerializer jss = new JavaScriptSerializer();
  System.Collections.ArrayList dic = new System.Collections.ArrayList();
  foreach (DataRow dr in dtb.Rows)
  {
   System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
   foreach (DataColumn dc in dtb.Columns)
   {
    drow.Add(dc.ColumnName, dr[dc.ColumnName]);
   }
   dic.Add(drow);
  }
  //序列化
  return jss.Serialize(dic);
} /// <summary>
/// 构建JSON字符串
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string CreateJsonParameters(DataTable dt)
{
 System.Text.StringBuilder sb = new System.Text.StringBuilder();
 if (dt != null && dt.Rows.Count > 0)
 {
  sb.Append("[");
  for (int i = 0; i < dt.Rows.Count; i++)
  {
   sb.Append("{");
   for (int j = 0; j < dt.Columns.Count; j++)
   {
    //如果值不是最后一个则添加逗号分隔
    if (j < dt.Columns.Count - 1)
    {
     sb.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + "/"" + dt.Rows[i][j].ToString() + "/",");
    }
     //如果值为最后个字符则不添加逗号
    else if (j == dt.Columns.Count - 1)
    {
     sb.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + "/"" + dt.Rows[i][j].ToString() + "/"");
    }
   }
   //如果为最后一个值的话 则不添加逗号
   if (i == dt.Rows.Count - 1)
   {
    sb.Append("}");
   }
   else
   {
    sb.Append("},");
   }
  }
  sb.Append("]");
  return sb.ToString();
 }
 else { return null; }
}