可能我們用慣了 Newtonsoft.JSon.dll 等第三方的類庫來實現序列化等類似的操作，但是有時只是簡單的用一下，感覺沒必要那麼費事，所謂殺雞焉用牛刀，自制個小刀即可。
代碼分享給大家，如下：
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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>
/// 過濾特殊字符
/// </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、布爾型
/// </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轉換成JSon
/// <summary>
/// List轉換成JSon
/// </summary>
public static string ListToJSon<T>(IList<T> list)
{
object obj = list[0];
return ListToJSon<T>(list, obj.GetType().Name);
}
/// <summary>
/// List轉換成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 對象轉換為JSon
/// <summary>
/// 對象轉換為JSon
/// </summary>
/// <param name="JSonObject">對象</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 對象集合轉換JSon
/// <summary>
/// 對象集合轉換JSon
/// </summary>
/// <param name="array">集合對象</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 普通集合轉換JSon
/// <summary>
/// 普通集合轉換JSon
/// </summary>
/// <param name="array">集合對象</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轉換為JSon
/// <summary>
/// DataSet轉換為JSon
/// </summary>
/// <param name="dataSet">DataSet對象</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轉換為JSon
/// <summary>
/// Datatable轉換為JSon
/// </summary>
/// <param name="table">Datatable對象</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轉換為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轉換為JSon
/// <summary>
/// DataReader轉換為JSon
/// </summary>
/// <param name="dataReader">DataReader對象</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
}
