asp.net中各种类型的JSON格式化_.net

复制代码代码如下:
 
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 
} 