ASP.NET DataSet查询结果转换为JSON格式数据

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方法如下:
public static string nulldata = "{\"result\":\"true\",\"msg\":\"没有相关数据\"}";
#region 查询结果转为json
/// <summary>
/// 查询结果转为json
/// </summary>
/// <param name="dt"></param>
/// <param name="count"></param>
/// <returns></returns>
public static string GetDataToJSON(DataTable dt, int count = 0)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
System.Collections.ArrayList dic = new System.Collections.ArrayList();
if (dt != null && dt.Rows.Count > 0)
{
if (count == 0)
{
count = dt.Rows.Count;
}
foreach (DataRow dr in dt.Rows)
{
System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
foreach (DataColumn dc in dt.Columns)
{
//string dcvalue = Common.PageBase.delhtml(dr[dc.ColumnName].ToString());
drow.Add(dc.ColumnName, dr[dc.ColumnName]);
}
dic.Add(drow);
}
//bool result = true;
string JsonString = jss.Serialize(dic);
string p = @"\\/Date\((\d+)\)\\/";
MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
//MatchEvaluator img_urlEvaluator = new MatchEvaluator(GetImgUrl);
Regex reg = new Regex(p);
//Regex img_url = new Regex("src=\\\\\"(.*?)\"");
//Regex img_url = new Regex("src=\"(.*?)\"");
JsonString = reg.Replace(JsonString, matchEvaluator);
//JsonString = img_url.Replace(JsonString, img_urlEvaluator);
return "{\"result\": \"true\"" + "," + "\"rows\":" + count + "," + "\"msg\":" + JsonString + "}";
}
else
{
return nulldata;
}
}
#endregion
/// <summary>
/// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
private static string ConvertJsonDateToDateString(Match m)
{
string result = string.Empty;
DateTime dt = new DateTime(1970, 1, 1);
dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
dt = dt.ToLocalTime();
result = dt.ToString("yyyy-MM-dd HH:mm:ss");
return result;
}
public string CreateJsonParameters(DataTable dt, int count = 0)
{
if (dt == null || dt.Rows.Count == 0)
{
return nulldata;
}
if (count == 0)
{
count = dt.Rows.Count;
}
bool result = true;
StringBuilder JsonString = new StringBuilder();
//Exception Handling
if (dt != null && dt.Rows.Count > 0)
{
JsonString.Append("{ ");
JsonString.Append("\"result\":" + result + "," + "rows:" + count + "," + "msg:[ ");
for (int i = 0; i < dt.Rows.Count; i++)
{
JsonString.Append("{ ");
for (int j = 0; j < dt.Columns.Count; j++)
{
if (j < dt.Columns.Count - 1)
{
JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");
}
else if (j == dt.Columns.Count - 1)
{
JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");
}
}
/*end Of String*/
if (i == dt.Rows.Count - 1)
{
JsonString.Append("} ");
}
else
{
JsonString.Append("}, ");
}
}
JsonString.Append("]}");
return JsonString.ToString();
}
else
{
return null;
}
}