将 DataTable 或 String 数据转化为json(.NET)

using System;
using System.Data;
using System.Text;
using System.Collections.Generic;
using System.Reflection;

namespace PowerCheck.Tools
{

public class ToJson
{
public ToJson()
{

}
public static string DataTableToJson(string jsonName, DataTable dt)
{
StringBuilder Json = new StringBuilder();
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++)
{
StringBuilder sb = new StringBuilder();
escape(dt.Rows[i][j].ToString(),sb);

Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + sb.ToString() + "\"");
if (j < dt.Columns.Count - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < dt.Rows.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}

/// <summary>
/// 将string数组转换成json字符串
/// </summary>
/// <param name="TagStrings">json对象数组名称</param>
/// <param name="Strings">json对象数组值</param>
/// <returns></returns>
public static string StringArrayToJason(string[] TagStrings, string[] Strings)
{
StringBuilder Json = new StringBuilder();
Json.Append("{");
for (int i = 0; i < Strings.Length; i++)
{
Json.Append(TagStrings[i]);
Json.Append(":");
Json.Append(Strings[i]);
if (i < Strings.Length - 1)
{
Json.Append(",");
}
}
Json.Append("}");
return Json.ToString();
}

public static string ObjectToJson<T>(string jsonName, IList<T> IL)
{
StringBuilder Json = new StringBuilder();
Json.Append("{\"" + jsonName + "\":[");
if (IL.Count > 0)
{
for (int i = 0; i < IL.Count; i++)
{
T obj = Activator.CreateInstance<T>();
Type type = obj.GetType();
PropertyInfo[] pis = type.GetProperties();
Json.Append("{");
for (int j = 0; j < pis.Length; j++)
{
Json.Append("\"" + pis[j].Name.ToString() + "\":\"" + pis[j].GetValue(IL[i], null) + "\"");
if (j < pis.Length - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < IL.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}

public static void escape(string s, StringBuilder sb)
{

for (int i = 0; i < s.Length; i++)
{
char ch = s[i];

switch (ch)
{

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;

case '/':

sb.Append("\\/");

break;

default:

// Reference: http://www.unicode.org/versions/Unicode5.1.0/ 
if ((ch >= '\u0000' && ch <= '\u001F')

|| (ch >= '\u007F' && ch <= '\u009F')

|| (ch >= '\u2000' && ch <= '\u20FF'))
{

string ss = Convert.ToString(ch,16);

sb.Append("\\u");

for (int k = 0; k < 4 - ss.Length; k++)
{

sb.Append('0');

}

sb.Append(ss.ToUpper());

}
else
{

sb.Append(ch);

}

break;

}

}

}

}

}