DataSet 转Json

1

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;

namespace BookSystem.Common
{
public class WebHelper
{
public static string Dataset2Json(DataSet ds, int total = -1) //total表示DataSet里dataTable的数据总条数
{
StringBuilder json = new StringBuilder();

foreach (DataTable dt in ds.Tables)
{
//{"total":5,"rows":[
json.Append("{\"total\":");
if (total == -1)
{
json.Append(dt.Rows.Count);
}
else
{
json.Append(total);
}
json.Append(",\"rows\":[");
json.Append(DataTable2Json(dt));
//json.Append(","attr1":"Large"")
json.Append("]}");
} return json.ToString();
}
public static string DataTable2Json(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
//jsonBuilder.Append("{\"total\":");
//jsonBuilder.Append("10,\"rows\":[");
for (int i = 0; i < dt.Rows.Count; i++)
{
//jsonBuilder.Append("{"total":5,"rows":[");
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
if (dt.Columns.Count > 0)
{
jsonBuilder.Append("\"fafangFS");
jsonBuilder.Append("\":\"");
jsonBuilder.Append("1\",");
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
}
jsonBuilder.Append("},");
}
if (dt.Rows.Count > 0)
{
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
}
//jsonBuilder.Append("]}");
return jsonBuilder.ToString();
}
}
}