json转换，c#后台生成json的方法
此文转自：http://bbs.csdn.net/topics/380200497，为了方便自己记忆才以文章形式保存。
usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
usingSystem.Data;
usingSystem.Reflection;
usingSystem.Collections;
usingSystem.Data.Common;
namespaceDotNet.Utilities
{
//JSON转换类
publicclassConvertJson
{
#region 私有方法
/// <summary>
/// 过滤特殊字符
/// </summary>
privatestaticstringString2Json(String s)
{
StringBuilder sb =newStringBuilder();
for(inti = 0; i < s.Length; i++)
{
charc = 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;
}
}
returnsb.ToString();
}
/// <summary>
/// 格式化字符型、日期型、布尔型
/// </summary>
privatestaticstringStringFormat(stringstr, Type type)
{
if(type ==typeof(string))
{
str = String2Json(str);
str ="\""+ str +"\"";
}
elseif(type ==typeof(DateTime))
{
str ="\""+ str +"\"";
}
elseif(type ==typeof(bool))
{
str = str.ToLower();
}
elseif(type !=typeof(string) &&string.IsNullOrEmpty(str))
{
str ="\""+ str +"\"";
}
returnstr;
}
#endregion
#region List转换成Json
/// <summary>
/// List转换成Json
/// </summary>
publicstaticstringListToJson<T>(IList<T> list)
{
objectobj = list[0];
returnListToJson<T>(list, obj.GetType().Name);
}
/// <summary>
/// List转换成Json
/// </summary>
publicstaticstringListToJson<T>(IList<T> list,stringjsonName)
{
StringBuilder Json =newStringBuilder();
if(string.IsNullOrEmpty(jsonName)) jsonName = list[0].GetType().Name;
Json.Append("{\""+ jsonName +"\":[");
if(list.Count > 0)
{
for(inti = 0; i < list.Count; i++)
{
T obj = Activator.CreateInstance<T>();
PropertyInfo[] pi = obj.GetType().GetProperties();
Json.Append("{");
for(intj = 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("]}");
returnJson.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>
publicstaticstringToJson(objectjsonObject)
{
stringjsonString ="{";
PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
for(inti = 0; i < propertyInfo.Length; i++)
{
objectobjectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject,null);
stringvalue =string.Empty;
if(objectValueisDateTime || objectValueisGuid || objectValueisTimeSpan)
{
value ="'"+ objectValue.ToString() +"'";
}
elseif(objectValueisstring)
{
value ="'"+ ToJson(objectValue.ToString()) +"'";
}
elseif(objectValueisIEnumerable)
{
value = ToJson((IEnumerable)objectValue);
}
else
{
value = ToJson(objectValue.ToString());
}
jsonString +="\""+ ToJson(propertyInfo[i].Name) +"\":"+ value +",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
returnjsonString +"}";
}
#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>
publicstaticstringToJson(IEnumerable array)
{
stringjsonString ="[";
foreach(objectiteminarray)
{
jsonString += ToJson(item) +",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
returnjsonString +"]";
}
#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>
publicstaticstringToArrayString(IEnumerable array)
{
stringjsonString ="[";
foreach(objectiteminarray)
{
jsonString = ToJson(item.ToString()) +",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
returnjsonString +"]";
}
#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>
publicstaticstringToJson(DataSet dataSet)
{
stringjsonString ="{";
foreach(DataTable tableindataSet.Tables)
{
jsonString +="\""+ table.TableName +"\":"+ ToJson(table) +",";
}
jsonString = jsonString.TrimEnd(',');
returnjsonString +"}";
}
#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>
publicstaticstringToJson(DataTable dt)
{
StringBuilder jsonString =newStringBuilder();
jsonString.Append("[");
DataRowCollection drc = dt.Rows;
for(inti = 0; i < drc.Count; i++)
{
jsonString.Append("{");
for(intj = 0; j < dt.Columns.Count; j++)
{
stringstrKey = dt.Columns[j].ColumnName;
stringstrValue = 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("]");
returnjsonString.ToString();
}
/// <summary>
/// DataTable转换为Json
/// </summary>
publicstaticstringToJson(DataTable dt,stringjsonName)
{
StringBuilder Json =newStringBuilder();
if(string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName;
Json.Append("{\""+ jsonName +"\":[");
if(dt.Rows.Count > 0)
{
for(inti = 0; i < dt.Rows.Count; i++)
{
Json.Append("{");
for(intj = 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("]}");
returnJson.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>
publicstaticstringToJson(DbDataReader dataReader)
{
StringBuilder jsonString =newStringBuilder();
jsonString.Append("[");
while(dataReader.Read())
{
jsonString.Append("{");
for(inti = 0; i < dataReader.FieldCount; i++)
{
Type type = dataReader.GetFieldType(i);
stringstrKey = dataReader.GetName(i);
stringstrValue = 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("]");
returnjsonString.ToString();
}
#endregion
}
}
