可能我们用惯了 Newtonsoft.Json.dll 等第三方的类库来实现序列化等类似的操作，但是有时只是简单的用一下，感觉没必要那么费事，所谓杀鸡焉用牛刀，自制个小刀即可。
代码分享给大家，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
}
dy("nrwz");
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