一，前言
DataTable的應用極其廣泛，對DataTable進行排序也有很多方式，每種的實現方式都不難，但是使用起來卻比較繁瑣，所以本人便寫了一個擴充套件方法，專門對DataTable進行操作。
本篇是使用Linq的方式去實現排序，程式碼很簡單，封裝後，使用起來也極其方便。
本擴充套件方法支援升序/降序排列，支援列以String、Double、Int、Datetime等方式排序。
相信看完的你，一定會有所收穫！
本文地址：https://www.cnblogs.com/lesliexin/p/15212026.html
二，原始碼
下面直接貼出擴充套件方法原始碼，程式碼很簡單：
using System;
using System.Data;
using System.Linq;
namespace DatatableSortDemo
{
/// <summary>
/// DataTable排序擴充套件
/// </summary>
public static class DatatableSort
{
/// <summary>
/// 排序方式
/// </summary>
public enum SortType
{
/// <summary>
/// 升序
/// </summary>
ASC,
/// <summary>
/// 降序
/// </summary>
DESC
}
/// <summary>
/// 列的型別
/// </summary>
public enum ColumnType
{
/// <summary>
/// String
/// </summary>
STRING,
/// <summary>
/// Int
/// </summary>
INT,
/// <summary>
/// Double
/// </summary>
DOUBLE,
/// <summary>
/// Datetime
/// </summary>
DATETIME
}
/// <summary>
/// String轉Double
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static double StrToDouble(this string str)
{
try
{
var d = Convert.ToDouble(str);
return d;
}
catch (Exception)
{
return 0;
}
}
/// <summary>
/// String轉Int
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static int StrToInt(this string str)
{
try
{
var d = str.StrToDouble();
int i = Convert.ToInt32(d);
return i;
}
catch (Exception)
{
return 0;
}
}
/// <summary>
/// String轉DateTime
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static DateTime StrToDatetime(this string str)
{
try
{
var d = Convert.ToDateTime(str);
return d;
}
catch (Exception)
{
return new DateTime();
}
}
/// <summary>
/// String轉Object
/// </summary>
/// <param name="str"></param>
/// <param name="colType"></param>
/// <returns></returns>
public static object StrToObject(this string str,ColumnType colType)
{
if (colType == ColumnType.STRING)
{
return str;
}
else if (colType == ColumnType.DOUBLE)
{
return str.StrToDouble();
}
else if (colType == ColumnType.INT)
{
return str.StrToInt();
}
else
{
return str.StrToDatetime();
}
}
/// <summary>
/// 排序
/// </summary>
/// <param name="dataTable">待排序Datatable</param>
/// <param name="colName">排序的列</param>
/// <param name="colType">排序列的型別</param>
/// <param name="sortType">排序方式</param>
/// <returns>排序後的Datetable</returns>
public static DataTable Sort(this DataTable dataTable, string colName, ColumnType colType, SortType sortType)
{
try
{
if (sortType == SortType.ASC)
{
var dt = dataTable.Rows.Cast<DataRow>().OrderBy(r => r[colName].ToString().StrToObject(colType)).CopyToDataTable();
return dt;
}
else
{
var dt = dataTable.Rows.Cast<DataRow>().OrderByDescending(r => r[colName].ToString().StrToObject(colType)).CopyToDataTable();
return dt;
}
}
catch (Exception)
{
return null;
}
}
}
}
三，使用示例
將上面的原始碼新增到專案中，然後在DataTable後使用即可。
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DatatableSortDemo
{
class Program
{
static void Main(string[] args)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("A"));
dt.Columns.Add(new DataColumn("B"));
dt.Columns.Add(new DataColumn("C"));
dt.Columns.Add(new DataColumn("D"));
dt.Rows.Add("字串3", "2021-08-31 10:00:00", "1", "45.6");
dt.Rows.Add("字串2", "2020-08-31 10:00:00", "2", "23.7");
dt.Rows.Add("字串1", "2019-08-31 10:00:00", "3", "99");
dt.Rows.Add("字串4", "2021-08-31 11:00:00", "4", "12");
dt.Rows.Add("字串5", "2021-08-31 10:01:00", "5", "34.5");
var d1 = dt.Sort("A", DatatableSort.ColumnType.STRING, DatatableSort.SortType.ASC);
var d1_1 = dt.Sort("A", DatatableSort.ColumnType.STRING, DatatableSort.SortType.DESC);
var d2 = dt.Sort("B", DatatableSort.ColumnType.DATETIME, DatatableSort.SortType.ASC);
var d2_1 = dt.Sort("B", DatatableSort.ColumnType.DATETIME, DatatableSort.SortType.DESC);
var d3 = dt.Sort("C", DatatableSort.ColumnType.INT, DatatableSort.SortType.ASC);
var d3_1 = dt.Sort("C", DatatableSort.ColumnType.INT, DatatableSort.SortType.DESC);
var d4 = dt.Sort("D", DatatableSort.ColumnType.DOUBLE, DatatableSort.SortType.ASC);
var d4_1 = dt.Sort("D", DatatableSort.ColumnType.DOUBLE, DatatableSort.SortType.DESC);
Console.WriteLine("按列A正序：");
DatatablePrint(d1);
Console.WriteLine("按列A倒序：");
DatatablePrint(d1_1);
Console.WriteLine("－－－－－－－－－－－－－－－－－－－－");
Console.WriteLine("按列B正序：");
DatatablePrint(d2);
Console.WriteLine("按列B倒序：");
DatatablePrint(d2_1);
Console.WriteLine("－－－－－－－－－－－－－－－－－－－－");
Console.WriteLine("按列C正序：");
DatatablePrint(d3);
Console.WriteLine("按列C倒序：");
DatatablePrint(d3_1);
Console.WriteLine("－－－－－－－－－－－－－－－－－－－－");
Console.WriteLine("按列D正序：");
DatatablePrint(d4);
Console.WriteLine("按列D倒序：");
DatatablePrint(d4_1);
Console.WriteLine("－－－－－－－－－－－－－－－－－－－－");
Console.ReadKey();
}
static void DatatablePrint(DataTable dt)
{
string s = "";
int iColCount = dt.Columns.Count;
foreach( DataColumn col in dt.Columns)
{
s += col.ColumnName + "\t";
}
Console.WriteLine(s);
foreach (DataRow row in dt.Rows)
{
s = "";
for(int i=0;i< dt.Columns.Count; i++)
{
s += row[i].ToString() + "\t";
}
Console.WriteLine(s);
}
}
}
}
四，執行結果
執行結果如下，排序都正確的。
-【END】-