asp.net中各种类型的JSON格式化

using system;
using system.collections.generic;
using system.text;
using system.data;
using system.reflection;
using system.collections;
using system.data.common;

public class convertjson
{
#region 私有方法
/// <summary>
/// 过滤特殊字符
/// </summary>
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>
/// 格式化字符型、日期型、布尔型
/// </summary>
private static string stringformat(string str, type 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();
}
else if (type != typeof(string) && string.isnullorempty(str))
{
str = "\"" + str + "\"";
}
return str;
}
#endregion

#region list转换成json
/// <summary>
/// list转换成json
/// </summary>
public static string listtojson<t>(ilist<t> list)
{
object obj = list[0];
return listtojson<t>(list, obj.gettype().name);
}

/// <summary>
/// list转换成json
/// </summary>
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();
}
#endregion

#region 对象转换为json
/// <summary>
/// 对象转换为json
/// </summary>
/// <param name="jsonobject">对象</param>
/// <returns>json字符串</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 + "}";
}
#endregion

#region 对象集合转换json
/// <summary>
/// 对象集合转换json
/// </summary>
/// <param name="array">集合对象</param>
/// <returns>json字符串</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 + "]";
}
#endregion

#region 普通集合转换json
/// <summary>
/// 普通集合转换json
/// </summary>
/// <param name="array">集合对象</param>
/// <returns>json字符串</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 + "]";
}
#endregion

#region dataset转换为json
/// <summary>
/// dataset转换为json
/// </summary>
/// <param name="dataset">dataset对象</param>
/// <returns>json字符串</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 + "}";
}
#endregion

#region datatable转换为json
/// <summary>
/// datatable转换为json
/// </summary>
/// <param name="table">datatable对象</param>
/// <returns>json字符串</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>
/// datatable转换为json
/// </summary>
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();
}
#endregion

#region datareader转换为json
/// <summary>
/// datareader转换为json
/// </summary>
/// <param name="datareader">datareader对象</param>
/// <returns>json字符串</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();
}
#endregion
}