/// <summary>
/// List转成json    
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="jsonName"></param>
/// <param name="list"></param>
/// <returns></returns>
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();
}

/// <summary>
/// List转成json    
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <returns></returns>
public static string ListToJson<T>(IList<T> list)
{
object obj = list[0];
return ListToJson<T>(list, obj.GetType().Name);
}

/// <summary>    
/// 对象转换为Json字符串    
/// </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 + "}";
}

/// <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 + "]";
}

/// <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 + "]";
}

/// <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转成Json    
/// </summary>
/// <param name="jsonName"></param>
/// <param name="dt"></param>
/// <returns></returns>
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();
}

/// <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();
}

/// <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 + "}";
}

/// <summary>
/// 过滤特殊字符
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
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>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
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();
}
return str;
}