using System;
using System.Collections;
using System.Data;
using System.Globalization;
using System.Reflection;
using System.Text;
public class JSONHelper
{
public static string Convert2Json(object o)
{
StringBuilder sb = new StringBuilder();
WriteValue(sb, o);
return sb.ToString();
}
private static void WriteDataRow(StringBuilder sb, DataRow row)
{
sb.Append("{");
foreach (DataColumn column in row.Table.Columns)
{
sb.AppendFormat("\"{0}\":", column.ColumnName);
WriteValue(sb, row[column]);
sb.Append(",");
}
if (row.Table.Columns.Count > 0)
{
sb.Length--;
}
sb.Append("}");
}
private static void WriteDataSet(StringBuilder sb, DataSet ds)
{
sb.Append("{\"Tables\":{");
foreach (DataTable table in ds.Tables)
{
sb.AppendFormat("\"{0}\":", table.TableName);
WriteDataTable(sb, table);
sb.Append(",");
}
if (ds.Tables.Count > 0)
{
sb.Length--;
}
sb.Append("}}");
}
private static void WriteDataTable(StringBuilder sb, DataTable table)
{
sb.Append("{\"Rows\":[");
foreach (DataRow row in table.Rows)
{
WriteDataRow(sb, row);
sb.Append(",");
}
if (table.Rows.Count > 0)
{
sb.Length--;
}
sb.Append("]}");
}
private static void WriteEnumerable(StringBuilder sb, IEnumerable e)
{
bool hasItems = false;
sb.Append("[");
foreach (object val in e)
{
WriteValue(sb, val);
sb.Append(",");
hasItems = true;
}
if (hasItems)
{
sb.Length--;
}
sb.Append("]");
}
private static void WriteHashtable(StringBuilder sb, Hashtable e)
{
bool hasItems = false;
sb.Append("{");
foreach (string key in e.Keys)
{
sb.AppendFormat("\"{0}\":", key.ToLower());
WriteValue(sb, e[key]);
sb.Append(",");
hasItems = true;
}
if (hasItems)
{
sb.Length--;
}
sb.Append("}");
}
private static void WriteObject(StringBuilder sb, object o)
{
MemberInfo[] members = o.GetType().GetMembers(BindingFlags.Public | BindingFlags.Instance);
sb.Append("{");
bool hasMembers = false;
foreach (MemberInfo member in members)
{
bool hasValue = false;
object val = null;
if ((member.MemberType & MemberTypes.Field) == MemberTypes.Field)
{
val = ((FieldInfo) member).GetValue(o);
hasValue = true;
}
else if ((member.MemberType & MemberTypes.Property) == MemberTypes.Property)
{
PropertyInfo property = (PropertyInfo) member;
if (property.CanRead && (property.GetIndexParameters().Length == 0))
{
val = property.GetValue(o, null);
hasValue = true;
}
}
if (hasValue)
{
sb.Append("\"");
sb.Append(member.Name);
sb.Append("\":");
WriteValue(sb, val);
sb.Append(",");
hasMembers = true;
}
}
if (hasMembers)
{
sb.Length--;
}
sb.Append("}");
}
private static void WriteString(StringBuilder sb, string s)
{
sb.Append("\"");
foreach (char c in s)
{
switch (c)
{
case '\b':
sb.Append(@"\b");
break;
case '\t':
sb.Append(@"\t");
break;
case '\n':
sb.Append(@"\n");
break;
case '\f':
sb.Append(@"\f");
break;
case '\r':
sb.Append(@"\r");
break;
case '"':
sb.Append("\\\"");
break;
case '\\':
sb.Append(@"\\");
break;
default:
{
int i = c;
if ((i < 0x20) || (i > 0x7f))
{
sb.AppendFormat(@"\u{0:X04}", i);
}
else
{
sb.Append(c);
}
break;
}
}
}
sb.Append("\"");
}
public static void WriteValue(StringBuilder sb, object val)
{
if ((val == null) || (val == DBNull.Value))
{
sb.Append("null");
}
else if ((val is string) || (val is Guid))
{
WriteString(sb, val.ToString());
}
else if (val is bool)
{
sb.Append(val.ToString().ToLower());
}
else if (((((val is double) || (val is float)) || ((val is long) || (val is int))) || ((val is short) || (val is byte))) || (val is decimal))
{
sb.AppendFormat(CultureInfo.InvariantCulture.NumberFormat, "{0}", new object[] { val });
}
else if (val.GetType().IsEnum)
{
sb.Append((int) val);
}
else if (val is DateTime)
{
sb.Append("new Date(\"");
sb.Append(((DateTime) val).ToString("MMMM, d yyyy HH:mm:ss", new CultureInfo("en-US", false).DateTimeFormat));
sb.Append("\")");
}
else if (val is DataSet)
{
WriteDataSet(sb, val as DataSet);
}
else if (val is DataTable)
{
WriteDataTable(sb, val as DataTable);
}
else if (val is DataRow)
{
WriteDataRow(sb, val as DataRow);
}
else if (val is Hashtable)
{
WriteHashtable(sb, val as Hashtable);
}
else if (val is IEnumerable)
{
WriteEnumerable(sb, val as IEnumerable);
}
else
{
WriteObject(sb, val);
}
}
}
