ASP. NET converts an object to a JSON string

Using system;
Using system. Collections. Generic;
Using system. LINQ;
Using system. Web;
Using system. text;
Using system. reflection;
Using system. collections;
Using system. Data;
Using system. Data. Common;

/// <Summary>
/// Summary description for tojson
/// </Summary>
Public class objecttojson
{
Public objecttojson ()
{
//
// Todo: Add constructor logic here
//
}

/// <Summary>
/// Convert list to JSON
/// </Summary>
/// <Typeparam name = "T"> </typeparam>
/// <Param name = "jsonname"> </param>
/// <Param name = "list"> </param>
/// <Returns> </returns>
Public static string listtojson <t> (ilist <t> list, string jsonname)
{
Stringbuilder JSON = new stringbuilder ();
If (string. isnullorempty (jsonname ))
Jsonname = list [0]. GetType (). Name;
JSON. append ("{\" "+ jsonname + "\":[");
If (list. Count> 0)
{
For (INT I = 0; I <list. Count; I ++)
{
T OBJ = activator. createinstance <t> ();
Propertyinfo [] Pi = obj. GetType (). getproperties ();
JSON. append ("{");
For (Int J = 0; j <pi. length; j ++)
{
Type type = PI [J]. getvalue (list [I], null). GetType ();
JSON. append ("\" "+ PI [J]. name. tostring () + "\": "+ stringformat (PI [J]. getvalue (list [I], null ). tostring (), type ));

If (j <pi. Length-1)
{
JSON. append (",");
}
}
JSON. append ("}");
If (I <list. Count-1)
{
JSON. append (",");
}
}
}
JSON. append ("]}");
Return JSON. tostring ();
}

/// <Summary>
/// Convert list to JSON
/// </Summary>
/// <Typeparam name = "T"> </typeparam>
/// <Param name = "list"> </param>
/// <Returns> </returns>
Public static string listtojson <t> (ilist <t> List)
{
Object OBJ = list [0];
Return listtojson <t> (list, obj. GetType (). Name );
}

/// <Summary>
/// Convert an object to a JSON string
/// </Summary>
/// <Param name = "jsonobject"> Object </param>
/// <Returns> JSON string </returns>
Public static string tojson (Object jsonobject)
{
String jsonstring = "{";
Propertyinfo [] propertyinfo = jsonobject. GetType (). getproperties ();
For (INT I = 0; I <propertyinfo. length; I ++)
{
Object objectvalue = propertyinfo [I]. getgetmethod (). Invoke (jsonobject, null );
String value = string. empty;
If (objectvalue is datetime | objectvalue is guid | objectvalue is timespan)
{
Value = "'" + objectvalue. tostring () + "'";
}
Else if (objectvalue is string)
{
Value = "'" + tojson (objectvalue. tostring () + "'";
}
Else if (objectvalue is ienumerable)
{
Value = tojson (ienumerable) objectvalue );
}
Else
{
Value = tojson (objectvalue. tostring ());
}
Jsonstring + = "\" "+ tojson (propertyinfo [I]. Name) +" \ ":" + value + ",";
}
Jsonstring. Remove (jsonstring. Length-1, jsonstring. Length );
Return jsonstring + "}";
}

/// <Summary>
/// Convert the object set to JSON
/// </Summary>
/// <Param name = "array"> set object </param>
/// <Returns> JSON string </returns>
Public static string tojson (ienumerable array)
{
String jsonstring = "[";
Foreach (Object item in array)
{
Jsonstring + = tojson (item) + ",";
}
Jsonstring. Remove (jsonstring. Length-1, jsonstring. Length );
Return jsonstring + "]";
}

/// <Summary>
/// Convert a common set to JSON
/// </Summary>
/// <Param name = "array"> set object </param>
/// <Returns> JSON string </returns>
Public static string toarraystring (ienumerable array)
{
String jsonstring = "[";
Foreach (Object item in array)
{
Jsonstring = tojson (item. tostring () + ",";
}
Jsonstring. Remove (jsonstring. Length-1, jsonstring. Length );
Return jsonstring + "]";
}

/// <Summary>
/// Datatable converted to JSON
/// </Summary>
/// <Param name = "table"> datatable object </param>
/// <Returns> JSON string </returns>
Public static string tojson (datatable DT)
{
Stringbuilder jsonstring = new stringbuilder ();
Jsonstring. append ("[");
Datarowcollection DRC = DT. Rows;
For (INT I = 0; I <DRC. Count; I ++)
{
Jsonstring. append ("{");
For (Int J = 0; j <DT. Columns. Count; j ++)
{
String strkey = DT. Columns [J]. columnname;
String strvalue = DRC [I] [J]. tostring ();
Type type = DT. Columns [J]. datatype;
Jsonstring. append ("\" "+ strkey + "\":");
Strvalue = stringformat (strvalue, type );
If (j <DT. Columns. Count-1)
{
Jsonstring. append (strvalue + ",");
}
Else
{
Jsonstring. append (strvalue );
}
}
Jsonstring. append ("},");
}
Jsonstring. Remove (jsonstring. Length-1, 1 );
Jsonstring. append ("]");
Return jsonstring. tostring ();
}

/// <Summary>
/// Convert the datatable to JSON
/// </Summary>
/// <Param name = "jsonname"> </param>
/// <Param name = "DT"> </param>
/// <Returns> </returns>
Public static string tojson (datatable DT, string jsonname)
{
Stringbuilder JSON = new stringbuilder ();
If (string. isnullorempty (jsonname ))
Jsonname = DT. tablename;
JSON. append ("{\" "+ jsonname + "\":[");
If (Dt. Rows. Count> 0)
{
For (INT I = 0; I <DT. Rows. Count; I ++)
{
JSON. append ("{");
For (Int J = 0; j <DT. Columns. Count; j ++)
{
Type type = DT. Rows [I] [J]. GetType ();
JSON. append ("\" "+ dt. columns [J]. columnname. tostring () + "\": "+ stringformat (DT. rows [I] [J]. tostring (), type ));
If (j <DT. Columns. Count-1)
{
JSON. append (",");
}
}
JSON. append ("}");
If (I <DT. Rows. Count-1)
{
JSON. append (",");
}
}
}
JSON. append ("]}");
Return JSON. tostring ();
}

/// <Summary>
/// Convert datareader to JSON
/// </Summary>
/// <Param name = "datareader"> datareader object </param>
/// <Returns> JSON string </returns>
Public static string tojson (dbdatareader datareader)
{
Stringbuilder jsonstring = new stringbuilder ();
Jsonstring. append ("[");
While (datareader. Read ())
{
Jsonstring. append ("{");
For (INT I = 0; I <datareader. fieldcount; I ++)
{
Type type = datareader. getfieldtype (I );
String strkey = datareader. getname (I );
String strvalue = datareader [I]. tostring ();
Jsonstring. append ("\" "+ strkey + "\":");
Strvalue = stringformat (strvalue, type );
If (I <datareader. fieldcount-1)
{
Jsonstring. append (strvalue + ",");
}
Else
{
Jsonstring. append (strvalue );
}
}
Jsonstring. append ("},");
}
Datareader. Close ();
Jsonstring. Remove (jsonstring. Length-1, 1 );
Jsonstring. append ("]");
Return jsonstring. tostring ();
}

/// <Summary>
/// Convert dataset to JSON
/// </Summary>
/// <Param name = "dataset"> DataSet object </param>
/// <Returns> JSON string </returns>
Public static string tojson (Dataset dataset)
{
String jsonstring = "{";
Foreach (datatable table in dataset. Tables)
{
Jsonstring + = "\" "+ Table. tablename +" \ ":" + tojson (table) + ",";
}
Jsonstring = jsonstring. trimend (',');
Return jsonstring + "}";
}

/// <Summary>
/// Filter special characters
/// </Summary>
/// <Param name = "S"> </param>
/// <Returns> </returns>
Private Static string string2json (string S)
{
Stringbuilder sb = new stringbuilder ();
For (INT I = 0; I <S. length; I ++)
{
Char c = S. tochararray () [I];
Switch (c)
{
Case '\"':
SB. append ("\" "); break;
Case '\\':
SB. append ("\\\\"); break;
Case '/':
SB. append ("\/"); break;
Case '\ B ':
SB. append ("\ B"); break;
Case '\ F ':
SB. append ("\ f"); break;
Case '\ N ':
SB. append ("\ n"); break;
Case '\ R ':
SB. append ("\ r"); break;
Case '\ t ':
SB. append ("\ t"); break;
Default:
SB. append (c); break;
}
}
Return sb. tostring ();
}

/// <Summary>
/// Format String, date, and Boolean
/// </Summary>
/// <Param name = "str"> </param>
/// <Param name = "type"> </param>
/// <Returns> </returns>
Private Static string stringformat (string STR, type)
{
If (type = typeof (string ))
{
STR = string2json (STR );
STR = "\" "+ STR + "\"";
}
Else if (type = typeof (datetime ))
{
STR = "\" "+ STR + "\"";
}
Else if (type = typeof (bool ))
{
STR = Str. tolower ();
}
Return STR;
}

}