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
}
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