本文实例讲述了C#实现DataTable,List和Json转换的方法。分享给大家供大家参考，具体如下：
1. 将DataTable或Ilist<>转换成JSON格式
using System;
using System.Data;
using System.Text;
using System.Collections.Generic;
using System.Reflection;
/// <summary>
/// 将DataTable或Ilist<>转换成JSON格式
/// </summary>
public class ToJson
{
public ToJson()
{
}
//DataTable转成Json
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++)
{
Json.Append( "\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"" );
if (j < dt.Columns.Count - 1)
{
Json.Append( "," );
}
}
Json.Append( "}" );
if (i < dt.Rows.Count - 1)
{
Json.Append( "," );
}
}
}
Json.Append( "]}" );
return Json.ToString();
}
//List转成json
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();
}
}
2. 各种数据集转换为json
/// <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 + "," ;
}
return Json.DeleteLast(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 += Json.ToJson(item) + "," ;
}
return Json.DeleteLast(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()) + "," ;
}
return Json.DeleteLast(jsonString) + "]" ;
}
/// <summary>
/// 删除结尾字符
/// </summary>
/// <param name="str">需要删除的字符</param>
/// <returns>完成后的字符串</returns>
private static string DeleteLast( string str)
{
if (str.Length > 1)
{
return str.Substring(0, str.Length - 1);
}
return str;
}
/// <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 table)
{
string jsonString = "[" ;
DataRowCollection drc = table.Rows;
for ( int i = 0; i < drc.Count; i++)
{
jsonString += "{" ;
foreach (DataColumn column in table.Columns)
{
jsonString += "\"" + ToJson(column.ColumnName) + "\":" ;
if (column.DataType == typeof (DateTime) || column.DataType == typeof ( string ))
{
jsonString += "\"" + ToJson(drc[i][column.ColumnName].ToString()) + "\"," ;
}
else
{
jsonString += ToJson(drc[i][column.ColumnName].ToString()) + "," ;
}
}
jsonString = DeleteLast(jsonString) + "}," ;
}
return DeleteLast(jsonString) + "]" ;
}
/// <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)
{
string jsonString = "[" ;
while (dataReader.Read())
{
jsonString += "{" ;
for ( int i = 0; i < dataReader.FieldCount; i++)
{
jsonString += "\"" + ToJson(dataReader.GetName(i)) + "\":" ;
if (dataReader.GetFieldType(i) == typeof (DateTime) || dataReader.GetFieldType(i) == typeof ( string ))
{
jsonString += "\"" + ToJson(dataReader[i].ToString()) + "\"," ;
}
else
{
jsonString += ToJson(dataReader[i].ToString()) + "," ;
}
}
jsonString = DeleteLast(jsonString) + "}" ;
}
dataReader.Close();
return DeleteLast(jsonString) + "]" ;
}
/// <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 += "\"" + ToJson(table.TableName) + "\":" + ToJson(table) + "," ;
}
return jsonString = DeleteLast(jsonString) + "}" ;
}
/// <summary>
/// String转换为Json
/// </summary>
/// <param name="value">String对象</param>
/// <returns>Json字符串</returns>
public static string ToJson( string value)
{
if ( string .IsNullOrEmpty(value))
{
return string .Empty;
}
string temstr;
temstr = value;
temstr = temstr.Replace( "{" , "｛" ).Replace( "}" , "｝" ).Replace( ":" , "：" ).Replace( "," , "，" ).Replace( "[" , "【" ).Replace( "]" , "】" ).Replace( ";" , "；" ).Replace( "\n" , "<br/>" ).Replace( "\r" , "" );
temstr = temstr.Replace( "\t" , " " );
temstr = temstr.Replace( "'" , "\'" );
temstr = temstr.Replace( @"\" , @"\\" );
temstr = temstr.Replace( "\"" , "\"\"" );
return temstr;
}
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
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