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 
}