C#完成DataTable,List和Json轉換的辦法。本站提示廣大學習愛好者：（C#完成DataTable,List和Json轉換的辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是C#完成DataTable,List和Json轉換的辦法正文
本文實例講述了C#完成DataTable,List和Json轉換的辦法。分享給年夜家供年夜家參考，詳細以下：
1. 將DataTable或Ilist<>轉換成JSON格局
using System;
using System.Data;
using System.Text;
using System.Collections.Generic;
using System.Reflection;
/// <summary>
/// 將DataTable或Ilist<>轉換成JSON格局
/// </summary>
public class ToJson
{
public ToJson()
{
}
//DataTable轉成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轉成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. 各類數據集轉換為json
/// <summary>
/// 對象轉換為Json字符串
/// </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 + ",";
}
return Json.DeleteLast(jsonString) + "}";
}
/// <summary>
/// 對象聚集轉換Json
/// </summary>
/// <param name="array">聚集對象</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>
/// 通俗聚集轉換Json
/// </summary>
/// <param name="array">聚集對象</param>
/// <returns>Json字符串</returns>
public static string ToArrayString(IEnumerable array)
{
string jsonString = "[";
foreach (object item in array)
{
jsonString = ToJson(item.ToString()) + ",";
}
return Json.DeleteLast(jsonString) + "]";
}
/// <summary>
/// 刪除開頭字符
/// </summary>
/// <param name="str">須要刪除的字符</param>
/// <returns>完成後的字符串</returns>
private static string DeleteLast(string str)
{
if (str.Length > 1)
{
return str.Substring(0, str.Length - 1);
}
return str;
}
/// <summary>
/// Datatable轉換為Json
/// </summary>
/// <param name="table">Datatable對象</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轉換為Json
/// </summary>
/// <param name="dataReader">DataReader對象</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 += "\"" + ToJson(table.TableName) + "\":" + ToJson(table) + ",";
}
return jsonString = DeleteLast(jsonString) + "}";
}
/// <summary>
/// String轉換為Json
/// </summary>
/// <param name="value">String對象</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.WordStr("{", "｛").WordStr("}", "｝").WordStr(":", "：").WordStr(",", "，").WordStr("[", "【").WordStr("]", "】").WordStr(";", "；").WordStr("\n", "<br/>").WordStr("\r", "");
temstr = temstr.WordStr("\t", " ");
temstr = temstr.WordStr("'", "\'");
temstr = temstr.WordStr(@"\", @"\\");
temstr = temstr.WordStr("\"", "\"\"");
return temstr;
}
願望本文所述對年夜家C#法式設計有所贊助。
