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

}