纽威
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using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ICSSoft.ASKDataProject
{
public class JSON
{
/// <summary>
/// DataSet转Json字符串,"主-子-子"结构
/// 需要建立主子表关系,第一张表为主表,第二张表为子表,第三张表为子件表
/// 会排除关联列
/// </summary>
/// <param name="dataSet"></param>
/// <param name="RelationName">关系名称</param>
/// <returns></returns>
public static string DataSetToJson(DataSet dataSet, string RelationName, string column, string RelationName2, string column2)
{
//if (!dataSet.Tables[0].Columns.Contains(column))
//{
//}
DataRelation dataRelation = new DataRelation(RelationName, dataSet.Tables[0].Columns[column], dataSet.Tables[1].Columns[column]);
DataRelation dataRelation2 = new DataRelation(RelationName2, dataSet.Tables[1].Columns[column2], dataSet.Tables[2].Columns[column2]);
dataSet.Relations.Add(dataRelation);
dataSet.Relations.Add(dataRelation2);
StringBuilder jsonString = new StringBuilder();
//foreach (DataTable table in dataSet.Tables)
//{
DataTable table = dataSet.Tables[0];
DataTable table2 = dataSet.Tables[1];
jsonString.Append("[");
DataRowCollection drc = table.Rows;
for (int i = 0; i < drc.Count; i++)
{
DataRow dataRow = drc[i];
jsonString.Append("{");
for (int j = 0; j < table.Columns.Count; j++)
{
string strKey = table.Columns[j].ColumnName;
if (dataSet.Relations[RelationName].ParentColumns.Select(a => a.Caption).Contains(strKey))
continue;
string strValue = dataRow[j].ToString();
Type type = table.Columns[j].DataType;
jsonString.Append("\"" + strKey + "\":");
strValue = StringFormat(strValue, type);
if (j < table.Columns.Count - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append(",\"" + RelationName + "\":");
DataRow[] drs = dataRow.GetChildRows(RelationName);
jsonString.Append("[");
foreach (DataRow dr in drs)
{
DataTable dt = dr.Table;
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
string strKey = dt.Columns[j].ColumnName;
if (dataSet.Relations[RelationName].ChildColumns.Select(a => a.Caption).Contains(strKey))
continue;
string strValue = dr[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);
}
}
////子件表
jsonString.Append(",\"" + RelationName2 + "\":");
//DataRowCollection drc2 = table2.Rows;
//for (int j = 0; j < drc2.Count; j++)
//{
// DataRow dataRow2 = drc2[j];
DataRow[] drss = dr.GetChildRows(RelationName2);//取不到值
jsonString.Append("[");
foreach (DataRow drSec in drss)
{
DataTable dtSec = drSec.Table;
jsonString.Append("{");
for (int k = 0; k < dtSec.Columns.Count; k++)
{
string strKey = dtSec.Columns[k].ColumnName;
if (dataSet.Relations[RelationName2].ChildColumns.Select(a => a.Caption).Contains(strKey))
continue;
string strValue = drSec[k].ToString();
Type type = dtSec.Columns[k].DataType;
jsonString.Append("\"" + strKey + "\":");
strValue = StringFormat(strValue, type);
if (k < dtSec.Columns.Count - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
if (drss.Length > 0)
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");//detailss的后方括号
jsonString.Append("},");
}
if (drs.Length > 0)
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
jsonString.Append("},");
}
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
//}
string res = jsonString.ToString();
return res;
}
/// <summary>
/// DataSet转Json字符串,主子结构
/// 需要建立主子表关系,第一张表为主表
/// 会排除关联列
/// </summary>
/// <param name="dataSet"></param>
/// <param name="RelationName">关系名称</param>
/// <returns></returns>
public static string DataSetToJson(DataSet dataSet, string RelationName, string column)
{
//if (!dataSet.Tables[0].Columns.Contains(column))
//{
//}
DataRelation dataRelation = new DataRelation(RelationName, dataSet.Tables[0].Columns[column], dataSet.Tables[1].Columns[column]);
dataSet.Relations.Add(dataRelation);
StringBuilder jsonString = new StringBuilder();
//foreach (DataTable table in dataSet.Tables)
//{
DataTable table = dataSet.Tables[0];
jsonString.Append("[");
DataRowCollection drc = table.Rows;
for (int i = 0; i < drc.Count; i++)
{
DataRow dataRow = drc[i];
jsonString.Append("{");
for (int j = 0; j < table.Columns.Count; j++)
{
string strKey = table.Columns[j].ColumnName;
if (dataSet.Relations[RelationName].ParentColumns.Select(a => a.Caption).Contains(strKey))
continue;
string strValue = dataRow[j].ToString();
Type type = table.Columns[j].DataType;
jsonString.Append("\"" + strKey + "\":");
strValue = StringFormat(strValue, type);
if (j < table.Columns.Count - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append(",\"" + RelationName + "\":");
DataRow[] drs = dataRow.GetChildRows(RelationName);
jsonString.Append("[");
foreach (DataRow dr in drs)
{
DataTable dt = dr.Table;
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
string strKey = dt.Columns[j].ColumnName;
if (dataSet.Relations[RelationName].ChildColumns.Select(a => a.Caption).Contains(strKey))
continue;
string strValue = dr[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("},");
}
if (drs.Length > 0)
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
jsonString.Append("},");
}
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
//}
string res = jsonString.ToString();
return res;
}
/// <summary>
/// 格式化字符型、日期型、布尔型
/// </summary>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
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;
}
/// <summary>
/// 过滤特殊字符
/// </summary>
/// <param name="s">字符串</param>
/// <returns>json字符串</returns>
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();
}
}
}